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 |