[Limdep Nlogit List] Weighting exogenous variables error

[Robak, Anna Michelle - robam013]

Hello All,

I’m attempting to use exogenous weighting for a latent class model, but I’m getting an error that says, « variable not in table or nonpositive weight found ». The variable is showing in the data table, and there are no negative values. Is there another reason I could be getting this error?

My script is:

nlogit
    ;lhs=choice, cset, alt
    ;choices=invest,none
;wts=wtage
;prob=pr1
;descriptives
;crosstab
    ;lcm=age, income,protecti, male, caucasia,restri_d , badtaste
    ;maxit=200
    ;rst=i1,i2,i3,i4,i11,0,0,0,0,i10
    ;pts=2
    ;model:
    u(invest)=inc*inc+NPVE*NPVEgain+big*secondbi+small*secondsm/
    u(none)=inc*inc+NPVE*NPVEgain+big*secondbi+small*secondsm+isdup$
 
Thanks,
Anna