[Gretl-users] Re: Panel-data sample manipulation-transformation

But the pxmean() function in the PanelTools package does indeed appear to do essentially what I want to do. The documentation states <</pxmean(const series y) Compute mean value of y across all units per time period. Missing values are ignored for computing the mean. Parameters • y, series, target series Returns Series with the mean value value across all units per observation. NA values are completely ignored and are not counted./>> ...and it appears that it computes my    (1/N)*sum_{i=1}^N [x{it}]    term, /including /handling the case of an unbalanced panel.

z_{it} = x_{it} (-) (1/N)*[x_{1t} + x_{2t} + ... + x_{Nt}]