fixed effect modelJoe Segen2016-12-12T23:04:19+00:00
fixed effect model
A statistical model that stipulates that the units being analysed–e.g. people in a trial, or studies in a meta-analysis, are the ones of interest, and thus constitute the entire set of units.
Only within-study variation is taken to influence the uncertainty of results (as reflected in the confidence interval) of a meta-analysis using a fixed-effect model. Variation between the estimates of effect from each study (heterogeneity) does not affect the confidence interval in a fixed-effect model.
Reference Cochrane definition, in www.nsc.nhs.uk/glossary/glossary_ind.htm