David,
Thanks for your reply. Since I am kinda new to this forum, could you please
advise me on where to read those questions in R-help? In addition, I did not
pay much attention to the na.action, probably I should use na.action =
na.omit instead of na.pass.
-Jack
On Mon, Nov 16, 2009 at 2:32 PM, David Winsemius <dwinsem...@comcast.net>wrote:
>
> On Nov 16, 2009, at 2:22 PM, Jack Luo wrote:
>
> Hi,
>>
>> I am trying to fit a logistic regression using glm, but my explanatory
>> variables are of mixed type: some are numeric, some are ordinal, some are
>> categorical, say
>>
>> If x1 is numeric, x2 is ordinal, x3 is categorical, is the following
>> formula
>> OK?
>>
>
> The formula's certainly "OK". What may be non-OK will be your understanding
> of the output. The default handling of ordinal factors is a common source of
> questions to R-help, so read up first.
>
>>
>> *model <- glm(y~x1+x2+x3, family=binomial(link="logit"),
>> na.action=na.pass)*
>>
>
> Why have you chosen that na.action option?
>
> --
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>
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