On Dec 1, 2011, at 2:06 AM, yuying shi wrote:
Dear all,
I am doing an ordinal data simulation. I　have a question
regarding the cut off values between categories. Suppose I have
three categories, if I do regression, there should be two cut off
values. I find some simulation code for the ordinal data. However,
they usually only generate a uniform random number and compare the
probability with the random number.
That's not a good description of what they are doing.
Could any one be so kind to tell me the rational behind it. I don't
know why we need a random number rather than just two fixed cut
off values.
One way to generate a random categorical variable constrained to three
values would just be to take a uniform variate on the interval [0,1]
and classify it based on whether which of the three segments it is in
for 0 < a < b < 1. This really is not an appropriate question for
rhelp so you are advised to submit further such questions somewhere
they are solicited such as statsexchange.com.
--
David Winsemius, MD
West Hartford, CT
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