[Gretl-devel] Re: data artefact for added obs

On 02/01/2025 13:35, Sven Schreiber wrote: > Am 19.12.2024 um 20:13 schrieb Sven Schreiber: > > I tried to replicate this problem with a public dataset, but that > wasn't so easy. Here's a script that replicates the problem: <hansl> nulldata 11 x = normal() d = !(index % 3) dataset addobs 1 print -o <hansl> Note that the dataset is not even declared as time-series. I guess we should have to revisit the real_periodic_dummy() function in lib/src/dataset.c. One of the things I'd do (but wouldn't fix the problem you spotted) is to change the code block maybe_extend_dummies(dset, oldn); if (dataset_is_time_series(dset)) { maybe_extend_lags(dset, oldn, dset->n - 1); } at line 1121 by moving the call to "maybe_extend_dummies(dset, oldn)" inside the if block: I don't think this should be done for a cross-sectional dataset (maybe for panel datasets...).