I am doing a logistic regression (in three steps) in SPSS on radical right support and gender, using data from the European social survey. The outcome variable is whether the person voted for a radical right party or not.
I have some attitudinal variables, as well as sociodemographics like age, marital status etc. These all go on the first regression model. Then in the second one I add 'female_leader' (i.e. whether the party they voted for had a female leader), and on the third an interaction between 'female' (of the voter) and 'female_leader'.
My problem is that it doesn't add the 'female_leader' in the second step, just repeats the first step. The third one it does add the interaction variable. I'm unsure why SPSS doesn't add the 'female_leader' variable.
Here's my code:
LOGISTIC REGRESSION VARIABLES all_votes
/METHOD=ENTER female marriage_recode religion_recode attendence_recode
unemployed
professional_worker skilled_workers culture_undermined gays_free_disagree
democracy_important
secondary_below_education degree_education_plus agea cntry
/METHOD=ENTER female_leader
/METHOD=ENTER interaction
/CONTRAST (cntry)=Indicator
/CONTRAST (marriage_recode)=Indicator
/CONTRAST (religion_recode)=Indicator
/CONTRAST (attendence_recode)=Indicator
/SAVE=RESID ZRESID
/CLASSPLOT
/PRINT=GOODFIT CI(95)
/CRITERIA=PIN(0.05) POUT(0.10) ITERATE(20) CUT(0.5).
Hopefully this is enough info. Thanks.