Hi all,
I am having some trouble performing a 2-level -nlogit-.
Here is the segment of code I am having some trouble with:
fillin uniqueNo EmployStatOfficial // Converts response into binary outcome
rename _fillin chosen
replace chosen = 1-chosen // Such that chosen = 1 if the individual
has the corresponding employment status
sort uniqueNo gender
// Filling in missing values (which are present due to use of the
fillin command):
replace gender = gender[_n-1] if gender==.
........
replace gh23a = gh23a[_n-1] if gh23a ==.
nlogitgen type = EmployStatOfficial(NotEconAct: 3, EconAct: 1 | 2)
nlogittree EmployStatOfficial type, choice(chosen)
// The following tree is then displayed:
tree structure specified for the nested logit model
type N EmployStat~l N k
-----------------------------------------------------
NotEconAct 1511021 --- Not Econom~e 1511021 775534
EconAct 3022042 --- Employed 1511021 347228
+- Unemployed 1511021 388259
-----------------------------------------------------
total 4533063 1511021
k = number of times alternative is chosen
N = number of observations at each level
// I then want to perform an -nlogit- using the above structure. I'm
not sure if I need to generate any new variables, or how I should
structure the equation for the regression. The command I've tried was:
nlogit chosen || type: gender (...other variables...) EmpStatHH ||
EmployStatOfficial:, noconstant case(uniqueNo)
I then get the following messages:
note: 1 case (2087331 obs) dropped due to no positive outcome or multiple
positive outcomes per case
note: branch 1 of level 1 is degenerate and the associated dissimilarity
parameter ([NotEconAct_tau]_cons) is not defined; see help nlogit for
details
no equations have been specified to identify the alternatives defined in
variable EmployStatOfficial; see nlogit for the proper syntax
r(198);
I am attempting to perform a logistic regression using certain
parameters at the Economically Active/Not Economically Active stage,
and then another regression using different parameters at the
Unemployed/Employed stage (should the Economically Active branch be
chosen). Please could you help with what I need to change in my nlogit
equation, including how to deal with the degenerate nest. I'm also not
sure if perhaps -clogit- would be more appropriate?
I hope my explanations are clear enough. Any help would be greatly appreciated.
Kind Regards
Brendon Gerding
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