Re: [R] Multinomial Logit Model with lots of Dummy Variables

From: ghpow1 <ghpow1_at_student.monash.edu.au>
Date: Sun, 17 Apr 2011 04:45:46 -0700 (PDT)

Hi

Thanks to Jeremy for his response...

I have been able to generate the factors and generate mlogit data using his code:

mldata<-mlogit.data(mydata, varying=NULL, choice="pitch_type_1", shape="wide")

my mlogit data looks like:

"dependent_var","A variable","B Var","chid","alt"

FALSE,"110","19",1,"0"
FALSE,"110","19",1,"1"
FALSE,"110","19",1,"2"
FALSE,"110","19",1,"3"
FALSE,"110","19",1,"4"

TRUE,"110","19",1,"5"
FALSE,"110","19",1,"6"
FALSE,"110","19",1,"7"
FALSE,"110","19",1,"8"
FALSE,"110","19",2,"0"
FALSE,"110","19",2,"1"
FALSE,"110","19",2,"2"
FALSE,"110","19",2,"3"
FALSE,"110","19",2,"4"
FALSE,"110","19",2,"5"

TRUE,"110","19",2,"6"
FALSE,"110","19",2,"7"
FALSE,"110","19",2,"8"
TRUE,"110","561",3,"0"
FALSE,"110","561",3,"1"
FALSE,"110","561",3,"2"
FALSE,"110","561",3,"3"
FALSE,"110","561",3,"4"
FALSE,"110","561",3,"5"
FALSE,"110","561",3,"6"
FALSE,"110","561",3,"7"
FALSE,"110","561",3,"8"

FALSE,"110","149",4,"0"
FALSE,"110","149",4,"1"
TRUE,"110","149",4,"2" ...

The mldata contains 651431 rows.

If I try to run this full data set I get the following error:

> mlogit.model<- mlogit(dependent_var~0|A+B, data = mldata, reflevel="0")
Error in model.matrix.default(formula, data) :   allocMatrix: too many elements specified Calls: mlogit ... model.matrix.mFormula -> model.matrix -> model.matrix.default
Execution halted

Smaller datasets (595 mldata rows) and mlogit works fine and generates regression output.

Is there a problem with mlogit and huge datasets?

I suppose this is perhaps not the best way to assess this kind of data, but I am trying to replicate a previous analysis that was completed on a similar amount of similar data.

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Received on Sun 17 Apr 2011 - 21:03:19 GMT

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