Re: [R] coding for categorical variables with unequal observations

From: Rolf Turner <r.turner_at_auckland.ac.nz>
Date: Fri, 04 Apr 2008 11:01:36 +1300

On 4/04/2008, at 10:45 AM, Nordlund, Dan (DSHS/RDA) wrote:

>> -----Original Message-----
>> From: r-help-bounces_at_r-project.org
>> [mailto:r-help-bounces_at_r-project.org] On Behalf Of Tanya Yatsunenko
>> Sent: Thursday, April 03, 2008 1:55 PM
>> To: r-help_at_r-project.org
>> Subject: [R] coding for categorical variables with unequal
>> observations
>>
>> Hi,
>> I am doing multiple regression, and have several X variables that are
>> categorical.
>> I read that I can use dummy or contrast codes for that, but are there
>> any special rules when there're unequal #observations in each
>> groups (4
>> females vs 7 males in a "gender" variable)?
>> Also, can R generate these codes for me?
>> THanks.
>>
>
> You don't need to do anything special, and yes you can just let SAS
> do it for you.

        <snip>

        Huh??? SAS???

        (Don't let SAS do *anything* for you!) :-)

                cheers,

                        Rolf Turner

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