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

Thanks Artur! No, the pmean() function is not useful because it relates to means across the time dimension. 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. Thanks again! I will explore the code and see whether this could be turned into a more massive operation (say to input a List and not a single variable, so that one can transform the whole sample in one stroke), and maybe I will return to this. Alecos Papadopoulos PhD Affiliate Researcher Dpt of Economics, Athens University of Economics and Business Foundation for Economic and Industrial Research (IOBE) web: alecospapadopoulos.wordpress.com/ ORCID:0000-0003-2441-4550 On 18/5/2025 15:32, Artur T. wrote: