Hi Lucas,

Do you get the same sign using lm instead of glm?

Regards,
Pascal



________________________________
 De : Lucas <lpchaparrovio@gmail.com>
À : Pascal Oettli <kridox@ymail.com> 
Cc : "r-help@r-project.org" <r-help@r-project.org> 
Envoyé le : Mercredi 7 mars 2012 23h02
Objet : Re: Re : [R] Problems with generalized linear model (glm) coefficients.


Hi Pascal.

I applied
my analysis in time. I have 25 fire seasons, each season starts on November and ends up on April (our summer), so I have used them as independent
observations. I know that assumption it could be wrong, but is the only way I can
use the information available.

Thank you.

2012/3/7 Pascal Oettli <kridox@ymail.com>

Hi Lucas,
>
>Do you apply your analysis in time or in space?
>
>Regards,
>Pascal
> 
>
>
>----- Mail original -----
>De : Lucas <lpchaparrovio@gmail.com>
>À : r-help@r-project.org
>Cc :
>Envoyé le : Mercredi 7 mars 2012 22h34
>Objet : [R] Problems with generalized linear model (glm) coefficients.
>
>
>Hello to everyone.
>
>I´m writing you because I´m feeling a bit frustrated with my work.
>
>My work consists in finding  the relation between the amount of fires and
>the weather, so, my response variable is the amount of fires in a fire
>season and the explanatory variables are the temperature, the amount of
>precipitation and the some others…. my problem is this; I keep getting the
>wrong sign in the coefficients estimated, I get a negative sign for
>temperature and a positive sign for precipitation, which is unreasonable,
>the greater the temperature I would expect more fire, on the contrary, the
>greater the precipitation I would expect less fires.  So far I have deal
>with overdispersion, multicollinearity  and the amount of zeroes through
>passing from Poisson to Negative Binomial and Hurdle.  I believe I have
>used all my options and still have the wrong signs on my coefficients.
>
>Do I have more options? What does it mean that I keep getting those signs?
>
>If anyone could help me I would really appreciate it.
>
>Thank you.
>
>
>Lucas.
>
>    [[alternative HTML version deleted]]
>
>
>______________________________________________
>R-help@r-project.org mailing list
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.
>
>
	[[alternative HTML version deleted]]

