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Table 3 SAS proc mixed adapted for meta–analysis of diagnostic accuracy study data

From: Meta-analysis and meta-modelling for diagnostic problems

SAS statement Explanation
proc mixed data=MMSE method=ml covtest; procedure mixed of SAS, data contains the data file, method
  specifies estimation
class study condition; defines the categorical variables used
model logtheta = condition/s; defines the model: LHS outcome, RHS covariates used
weight w; w contains inverse variance as weight
random study(condition); factor study nested in condition
parms (1) (1)/hold=2; specifies starting values, hold=2 fixes the residual variance component
run; executes the program