This code system http://terminology.hl7.org/CodeSystem/statistic-model-code defines the following codes:
      
        
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            Code
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            Display
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            Definition
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          | oneTailedTest
            
             
          
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          one-tailed test (1 threshold) | 
          
          Used for one-tailed test (1 threshold), no additional elements needed | 
        
        
        
          
          | twoTailedTest
            
             
          
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          two-tailed test (2 thresholds) | 
          
          Used for two-tailed test (2 threshold), no additional elements needed | 
        
        
        
          
          | zTest
            
             
          
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          z-test | 
          
          Used for z-test, no additional elements needed | 
        
        
        
          
          | oneSampleTTest
            
             
          
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          1-sample t-test | 
          
          Used for 1-sample t-test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | twoSampleTTest
            
             
          
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          2-sample t-test | 
          
          Used for 2-sample t-test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | pairedTTest
            
             
          
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          paired t-test | 
          
          Used for paired t-test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | chiSquareTest
            
             
          
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          Chi-square test | 
          
          Used for Chi-square test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | chiSquareTestTrend
            
             
          
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          Chi-square test for trend | 
          
          Used for Chi-square test for trend, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | pearsonCorrelation
            
             
          
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          Pearson correlation | 
          
          Used for Pearson correlation, no additional elements needed | 
        
        
        
          
          | anova
            
             
          
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          ANOVA (ANalysis Of VAriance) | 
          
          Used for ANOVA method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | anovaOneWay
            
             
          
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          one-way ANOVA | 
          
          Used for one-way ANOVA method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | anovaTwoWay
            
             
          
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          2-way ANOVA without replication | 
          
          Used for 2-way ANOVA without replication method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | anovaTwoWayReplication
            
             
          
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          2-way ANOVA with replication | 
          
          Used for 2-way ANOVA with replication method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | manova
            
             
          
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          multivariate ANOVA (MANOVA) | 
          
          Used for multivariate ANOVA (MANOVA) method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | anovaThreeWay
            
             
          
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          3-way ANOVA | 
          
          Used for 3-way ANOVA method of analysis, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | signTest
            
             
          
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          sign test | 
          
          Used for sign test, no additional elements needed | 
        
        
        
          
          | wilcoxonSignedRankTest
            
             
          
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          Wilcoxon signed-rank test | 
          
          Used for Wilcoxon signed-rank test, no additional elements needed | 
        
        
        
          
          | wilcoxonRankSumTest
            
             
          
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          Wilcoxon rank-sum test | 
          
          Used for Wilcoxon rank-sum test, no additional elements needed | 
        
        
        
          
          | mannWhitneyUTest
            
             
          
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          Mann-Whitney U test | 
          
          Used for Mann-Whitney U test, no additional elements needed | 
        
        
        
          
          | fishersExactTest
            
             
          
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          Fisher’s exact test | 
          
          Used for Fisher's exact test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | mcnemarsTest
            
             
          
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          McNemar’s test | 
          
          Used for McNemar's test, no additional elements needed | 
        
        
        
          
          | kruskalWallisTest
            
             
          
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          Kruskal Wallis test | 
          
          Used for Kruskal Wallis test, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | spearmanCorrelation
            
             
          
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          Spearman correlation | 
          
          Used for Spearman correlation, no additional elements needed | 
        
        
        
          
          | kendallCorrelation
            
             
          
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          Kendall correlation | 
          
          Used for Kendall correlation, no additional elements needed | 
        
        
        
          
          | friedmanTest
            
             
          
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          Friedman test | 
          
          Used for Friedman test, no additional elements needed | 
        
        
        
          
          | goodmanKruskasGamma
            
             
          
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          Goodman Kruska’s Gamma | 
          
          Used for Goodman Kruska’s Gamma, no additional elements needed | 
        
        
        
          
          | glm
            
             
          
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          GLM (Generalized Linear Model) | 
          
          Used for GLM (Generalized Linear Model), no additional elements needed | 
        
        
        
          
          | glmProbit
            
             
          
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          GLM with probit link | 
          
          Used for GLM with probit link, no additional elements needed | 
        
        
        
          
          | glmLogit
            
             
          
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          GLM with logit link | 
          
          Used for GLM with logit link, no additional elements needed | 
        
        
        
          
          | glmIdentity
            
             
          
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          GLM with identity link | 
          
          Used for GLM with identity link, no additional elements needed | 
        
        
        
          
          | glmLog
            
             
          
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          GLM with log link | 
          
          Used for GLM with log link, no additional elements needed | 
        
        
        
          
          | glmGeneralizedLogit
            
             
          
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          GLM with generalized logit link | 
          
          Used for GLM with generalized logit link, no additional elements needed | 
        
        
        
          
          | glmm
            
             
          
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          Generalized linear mixed model (GLMM) | 
          
          Used for Generalized linear mixed model (GLMM), no additional elements needed | 
        
        
        
          
          | glmmProbit
            
             
          
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          GLMM with probit link | 
          
          Used for GLMM with probit link, no additional elements needed | 
        
        
        
          
          | glmmLogit
            
             
          
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          GLMM with logit link | 
          
          Used for GLMM with logit link, no additional elements needed | 
        
        
        
          
          | glmmIdentity
            
             
          
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          GLMM with identity link | 
          
          Used for GLMM with identity link, no additional elements needed | 
        
        
        
          
          | glmmLog
            
             
          
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          GLMM with log link | 
          
          Used for GLMM with log link, no additional elements needed | 
        
        
        
          
          | glmmGeneralizedLogit
            
             
          
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          GLMM with generalized logit link | 
          
          Used for GLMM with generalized logit link, no additional elements needed | 
        
        
        
          
          | linearRegression
            
             
          
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          Linear Regression | 
          
          Used for linear regression method of analysis, no additional elements needed | 
        
        
        
          
          | logisticRegression
            
             
          
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          Logistic Regression | 
          
          Used for logistic regression method of analysis, no additional elements needed | 
        
        
        
          
          | polynomialRegression
            
             
          
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          Polynomial Regression | 
          
          Used for Polynomial regression method of analysis, no additional elements needed | 
        
        
        
          
          | coxProportionalHazards
            
             
          
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          Cox Proportional Hazards | 
          
          Used for Cox proportional hazards method of analysis, no additional elements needed | 
        
        
        
          
          | binomialDistributionRegression
            
             
          
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          Binomial Distribution for Regression | 
          
          Used for Binomial Distribution for Regression, no additional elements needed | 
        
        
        
          
          | multinomialDistributionRegression
            
             
          
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          Multinomial Distribution for Regression | 
          
          Used for Multinomial Distribution for Regression, no additional elements needed | 
        
        
        
          
          | poissonRegression
            
             
          
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          Poisson Regression | 
          
          Used for Poisson Regression, no additional elements needed | 
        
        
        
          
          | negativeBinomialRegression
            
             
          
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          Negative Binomial Regression | 
          
          Used for Negative Binomial Regression, no additional elements needed | 
        
        
        
          
          | zeroCellConstant
            
             
          
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          Zero-cell adjustment with constant | 
          
          Zero-cell adjustment done by adding a constant to all cells of affected studies, paired with "value" to define the constant | 
        
        
        
          
          | zeroCellContinuityCorrection
            
             
          
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          Zero-cell adjustment with continuity correction | 
          
          Zero-cell adjustment done by treatment arm continuity correction, no additional elements needed | 
        
        
        
          
          | adjusted
            
             
          
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          Adjusted analysis | 
          
          Used for adjusted analysis, paired with variable element(s) | 
        
        
        
          
          | interactionTerm
            
             
          
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          Interaction term | 
          
          Used for interaction term, paired with "value" and two or more variable elements | 
        
        
        
          
          | manteHaenszelMethod
            
             
          
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          Mantel-Haenszel method | 
          
          Used for Mantel-Haenszel method, no additional elements needed | 
        
        
        
          
          | metaAnalysis
            
             
          
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          Meta-analysis | 
          
          Used for meta-analysis, no additional elements needed | 
        
        
        
          
          | inverseVariance
            
             
          
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          Inverse variance method | 
          
          Used for inverse variance method of meta-analysis, no additional elements needed | 
        
        
        
          
          | petoMethod
            
             
          
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          Peto method | 
          
          Used for Peto method of meta-analysis, no additional elements needed | 
        
        
        
          
          | hartungKnapp
            
             
          
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          Hartung-Knapp adjustment | 
          
          Hartung-Knapp/Hartung-Knapp-Sidik-Jonkman adjustment used in meta-analysis, no additional elements needed | 
        
        
        
          
          | modifiedHartungKnapp
            
             
          
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          Modified Hartung-Knapp adjustment | 
          
          Modified Hartung-Knapp/Hartung-Knapp-Sidik-Jonkman adjustment used in meta-analysis, no additional elements needed | 
        
        
        
          
          | effectsFixed
            
             
          
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          Fixed-effects | 
          
          From a fixed-effects analysis, no additional elements needed | 
        
        
        
          
          | effectsRandom
            
             
          
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          Random-effects | 
          
          From a random-effects analysis, no additional elements needed | 
        
        
        
          
          | chiSquareTestHomogeneity
            
             
          
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          Chi-square test for homogeneity | 
          
          Used for Chi-square test for homogeneity, may be paired with "value" to express degrees of freedom | 
        
        
        
          
          | dersimonianLairdMethod
            
             
          
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          Dersimonian-Laird method | 
          
          Used for Dersimonian-Laird method of tau estimation, no additional elements needed | 
        
        
        
          
          | pauleMandelMethod
            
             
          
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          Paule-Mandel method | 
          
          Used for Paule-Mandel method of tau estimation, no additional elements needed | 
        
        
        
          
          | restrictedLikelihood
            
             
          
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          Restricted Maximum Likelihood method | 
          
          Used for Restricted Maximum Likelihood method of tau estimation, no additional elements needed | 
        
        
        
          
          | maximumLikelihood
            
             
          
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          Maximum Likelihood method | 
          
          Used for Maximum Likelihood method of tau estimation, no additional elements needed | 
        
        
        
          
          | empiricalBayes
            
             
          
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          Empirical Bayes method | 
          
          Used for Empirical Bayes method of tau estimation, no additional elements needed | 
        
        
        
          
          | hunterSchmidt
            
             
          
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          Hunter-Schmidt method | 
          
          Used for Hunter-Schmidt method of tau estimation, no additional elements needed | 
        
        
        
          
          | sidikJonkman
            
             
          
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          Sidik-Jonkman method | 
          
          Used for Sidik-Jonkman method of tau estimation, no additional elements needed | 
        
        
        
          
          | hedgesMethod
            
             
          
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          Hedges method | 
          
          Used for Hedges method of tau estimation, no additional elements needed | 
        
        
      
        
          
          | tauDersimonianLaird
            
             
          
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          Dersimonian-Laird method | 
          
          Dersimonian-Laird method for tau squared | 
        
        
        
          
          | tauPauleMandel
            
             
          
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          Paule-Mandel method | 
          
          Paule-Mandel method for tau squared | 
        
        
        
          
          | tauRestrictedMaximumLikelihood
            
             
          
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          Restricted Maximum Likelihood method | 
          
          Restricted Maximum Likelihood method for tau squared | 
        
        
        
          
          | tauMaximumLikelihood
            
             
          
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          Maximum Likelihood method | 
          
          Maximum Likelihood method for tau squared | 
        
        
        
          
          | tauEmpiricalBayes
            
             
          
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          Empirical Bayes method | 
          
          Empirical Bayes method for tau squared | 
        
        
        
          
          | tauHunterSchmidt
            
             
          
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          Hunter-Schmidt method | 
          
          Hunter-Schmidt method for tau squared | 
        
        
        
          
          | tauSidikJonkman
            
             
          
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          Sidik-Jonkman method | 
          
          Sidik-Jonkman method for tau squared | 
        
        
        
          
          | tauHedges
            
             
          
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          Hedges method | 
          
          Hedges method for tau squared | 
        
        
        
          
          | poolMantelHaenzsel
            
             
          
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          Mantel-Haenszel method | 
          
          Mantel-Haenszel method for pooling in meta-analysis | 
        
        
        
          
          | poolInverseVariance
            
             
          
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          Inverse variance method | 
          
          Inverse variance method for pooling in meta-analysis | 
        
        
        
          
          | poolPeto
            
             
          
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          Peto method | 
          
          Peto method for pooling in meta-analysis | 
        
        
        
          
          | poolGeneralizedLinearMixedModel
            
             
          
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          Generalized linear mixed model (GLMM) | 
          
          Generalized linear mixed model (GLMM) method for pooling in meta-analysis |