dummy coding of categorical variables results in zero coefficients and standard errors

2023-12-20 Thread tim.goodspeed
A basic stat's question and a specific PSPP query, please. Any help gratefully received. I can't see this in the archives anywhere (searching for 'categorical' and 'dummy'). For a linear regression, some variables are categorical and so included using dummy coding (Coding Systems for Categori

Re: dummy coding of categorical variables ( Pspp-users Digest, Vol 209, Issue 11 )

2023-12-20 Thread tim.goodspeed
and include the regression output table in a pspp-users@gnu.org message?) Tim Goodspeed +44 (0)7714 136 176|@TimGoodspeed -Original Message- From: pspp-users-bounces+tim.goodspeed=btinternet@gnu.org On Behalf Of pspp-users-requ...@gnu.org Sent: Wednesday, December 20, 2023 10

RE: dummy coding of categorical variables

2023-12-21 Thread tim.goodspeed
Thank you everyone for your responses. To close this one off: IT WAS A CODING ERROR. IT IS NOT A BUG. Took a while last night to find why this was happening. I tried to repeat a smaller model in excel with the troublesome variables and this resulted in some similar errors. So it is not a p