MATLAB Central Newsreader - ordered probit model

ordered probit model

sujata panday — Tue, 17 Jun 2008 14:10:21 -0400

Hi,

I want to estimate an ordered probit model in matlab. I
have three categories so the dependent variable is not
simply binary. I think the function mnrfit is the right one
for it. But I do not want it to include an intercept term
which it automatically does. The glmfit function allows one
to disable the constant term. Is it possible to do
something like this too for the mnrfit function?

Or are there other functions within Matlab that i can use
to estimate an ordered probit model.

Regards
Sujata

Re: ordered probit model

sujata panday — Wed, 18 Jun 2008 20:38:02 -0400

It appears that matlab mnrfit function automatically omits
the constant term when ordinal data is chosen.

"sujata panday" <sujatagp@gmail.com> wrote in message
<g38gkd$e7e$1@fred.mathworks.com>...
> Hi,
>
> I want to estimate an ordered probit model in matlab. I
> have three categories so the dependent variable is not
> simply binary. I think the function mnrfit is the right
one
> for it. But I do not want it to include an intercept term
> which it automatically does. The glmfit function allows
one
> to disable the constant term. Is it possible to do
> something like this too for the mnrfit function?
>
> Or are there other functions within Matlab that i can use
> to estimate an ordered probit model.
>
> Regards
> Sujata

Re: ordered probit model

Ketan — Fri, 20 Jun 2008 21:20:18 -0400

I was trying to use mnrfit for my problem but I am getting
the following error:

====ERROR====
??? Error using ===> mnrfit
Inputs to mnrfit must be floats, namely single or double.

Error in ==> mnrfit at 125
dataClass = superiorfloat(x,y);
====ERROR====

My variable x is double. I tried casting it as single using
x=single(x); command, Still I am getting this error.

Any help will be much appreciated.

Regards,
Ketan