Thanks for helping me out with the thing of quotation marks. I finally could save time running programs at the university and home. One additional question for all of you. I'm starting to be familiar with multinomial regression models. Actually I'm doing some exercise with the pneumo data that appears in Faraway library. The database has 24 observations and I want to study the probability of getting sick according with the number of years working at a coal mine. Here is the issue. For modelling that response what I need to include in the model is something similar at what is produced by: xtabs(Freq~year+status). This table provided me the proportions of people sick according with years worked and severity of the disease.
The question is: do this imply that I need to transform my data previously to run the regression? how?
Thanks in advance.
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