Re: Is Logistic Regression Calculated Dependent Variable Average Supposed to Equal to the Actual Average?

[John Darrington]

The /SAVE subcommand for LOGISTIC REGRESSION has not yet been implemented.

J'

On Tue, Mar 23, 2021 at 05:39:55PM +0000, Ricardo Mejias wrote:
     Unlike for linear OLS regression, PSPP logistic regression does not 
produce a calculated dependent variable, which I need for my project. When I 
use the coefficients of the logistic regression to do the calculation on the 
same data in this way:
     
     
     COMPUTE CalcDep = 1/(1 + 
EXP(-(-5.844816350213-3.733929982147*Party20210112Rep-3.429046437566*Party20210112Dem-3.537704000024*DemNpaLpf-3.867034376711*RepNpaLpf+0.92585743209*WhiteNotHisp-0.309549809307*Hispanic-0.242244899198*BlackNotHisp+0.699661534759*Genders
 
-0.002047977071*AgeInMonths-0.000010353254*PopulationPerSqrMileN-0.00000071631*AvgHouseValuePerPersonN+0.000001170117*AverageIncomePerPersonN))).
     
     [cid:52ab50a1-46fe-4f4d-a281-bbba7e2cc677]
     
     
     the average of the values of the calculated dependent variable (CalcDep) 
is much different than the average of the actual dependent variable 
(Depen20210209LPF), unlike in linear OLS regression where these averages or 
totals are always the same. I think that when I used logistic regression in 
SAS, it was the same way.
     
     
     I have searched the internet extensively to find whether logistic 
calculated and actual dependent variables should have the same average. But 
despite the large availability of good material on logistic regression, I could 
not find anything on this subject.
     
     
     Do you have an answer to this question?
     
     
     And could that answer be related to why there is no feature in PSPP to 
show the calculated dependent variable in logistic regression?
     
     
     This request does not require samples of data and code since the answer to 
it does not depend on them.