PQStat - Baza Wiedzy

Weights of individual studies

The weight $w_i$ of the study depends on the observed variability.

For the fixed effect, the variability is due only to sampling error (error within each study) - that is, the size of $SE$ :

$\begin{displaymath} w_i=\frac{1}{SE^2} \end{displaymath}$

For a random effect, variability is due to sampling error (error within each study) - that is, the magnitude of $SE$ , and differences between studies – that is, the observed variance $T^2$ :

$\begin{displaymath} w_i=\frac{1}{SE^2+T^2} \end{displaymath}$

Based on the weights assigned to each study, the share of a given study in the entire analysis is determined. This is the percentage that the weight of a given study represents in relation to the total weight of all included studies.

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Weights of individual studies

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