On Sep 7, 2024, at 7:05 AM, Riccardo (Jack) Lucchetti <p002264(a)staff.univpm.it&gt; wrote: ***This email is from an external source. Only open links and attachments from a Trusted Sender.*** > On 07/09/2024 11:18, Sven Schreiber wrote: >> Am 06.09.2024 um 22:53 schrieb Summers, Peter: >> >> Hi all, >> >> When trying to use the console to create a new variable, I get an error message after typing “if (female == 1)” saying “error evaluating ‘if’”. I’ve also tried it with a script and get the same result. This is on Windows, latest snapshot (office desktop) and also with the previous win64.zip snapshot (classroom). I’ve tried spacing/no spacing, parentheses & not, all with no change. >> > If 'female' is a series, then 'female==1' will also yield a (dummy) series, and that won't work with a boolean check, because what should the result be? So an if-block needs a scalar/unique input for evaluation. Perhaps you should give more context as to what you are trying to achieve. For example, a ternary statement is often useful. I'm assuming you want to perform some action on a subsample only. In that case, the most general way to do so is to use a "smpl" statement, as in <hansl> smpl female == 1 --restrict ols foo const bar baz # ... more commands ... </hansl> and you use a "smpl full" statement to go back to the full sample. As Sven said, in case all you want to do is assign to a variable conditionally, the ternary assignment operator is very handy, as in <hansl> series femage = (female == 1) ? age : NA </hansl> where I added parentheses for clarity., but they aren't necessary. ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti ------------------------------------------------------- _______________________________________________ Gretl-users mailing list -- gretl-users(a)gretlml.univpm.it To unsubscribe send an email to gretl-users-leave(a)gretlml.univpm.it Website: https://gretlml.univpm.it/postorius/lists/gretl-users.gretlml.univpm.it/