The metafor Package

A Meta-Analysis Package for R

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analyses:morris2008

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analyses:morris2008 [2021/08/27 07:27]
Wolfgang Viechtbauer
analyses:morris2008 [2021/11/08 13:17]
Wolfgang Viechtbauer
Line 99: Line 99:
 ==== The Actual Meta-Analysis ==== ==== The Actual Meta-Analysis ====
  
-For the actual meta-analysis part, we simply pass the ''yi'' and ''vi'' values to the ''rma()'' function. For example, a fixed-effects model can be fitted with:+For the actual meta-analysis part, we simply pass the ''yi'' and ''vi'' values to the ''rma()'' function. For example, an equal-effects model can be fitted with:
 <code rsplus> <code rsplus>
-rma(yi, vi, data=dat, method="FE", digits=2)+rma(yi, vi, data=dat, method="EE", digits=2)
 </code> </code>
 <code output> <code output>
-Fixed-Effects Model (k = 5)+Equal-Effects Model (k = 5)
  
-Test for Heterogeneity: +I^2 (total heterogeneity / total variability):   9.69% 
 +H^2 (total variability / sampling variability):  1.11 
 + 
 +Test for Heterogeneity:
 Q(df = 4) = 4.43, p-val = 0.35 Q(df = 4) = 4.43, p-val = 0.35
  
 Model Results: Model Results:
  
-estimate       se     zval     pval    ci.lb    ci.ub           +estimate    se  zval  pval  ci.lb  ci.ub  
-    0.95     0.14     6.62     <.01     0.67     1.23      *** +    0.95  0.14  6.62  <.01   0.67   1.23  *** 
  
 --- ---
-Signif. codes: ***’ 0.001 **’ 0.01 *’ 0.05 .’ 0.1 ‘ ’ 1+Signif. codes: '***0.001 '**0.01 '*0.05 '.0.1 ' ' 1
 </code> </code>
 Note that these results are slightly different than the ones in Table 5 due to the different ways of estimating the sampling variances. Note that these results are slightly different than the ones in Table 5 due to the different ways of estimating the sampling variances.
analyses/morris2008.txt · Last modified: 2021/11/08 13:17 by Wolfgang Viechtbauer