Hi everyone,
I have a problem with running a glm using a subset of my data. Whenever I
choose a subset, in the summary the factors arent shown (as if the variable was
a continuous variable). If I dont use subsets then all the factors are shown. I
have copied the output from summary for both cases.
Thanks for the help,
Muri
> model<-glm(log(cpue)~year,family=gaussian)
Call:
glm(formula = log(cpue) ~ year, family = gaussian)
Deviance Residuals:
Min 1Q Median 3Q Max
-2.0962 -0.5851 -0.1241 0.4805 3.9236
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 0.8899 0.1844 4.825 1.42e-06 ***
year1990 -0.6107 0.1925 -3.173 0.00152 **
year1991 -1.7466 0.1902 -9.184 < 2e-16 ***
year1992 -1.4061 0.1864 -7.544 5.07e-14 ***
year1993 -1.4069 0.1860 -7.565 4.31e-14 ***
...
> model<-glm(log(cpue)~year,family=gaussian,subset(data.all,species=="n")
Call:
glm(formula = log(cpue) ~ year, family = gaussian, data = subset(data.all,
species == "n"))
Deviance Residuals:
Min 1Q Median 3Q Max
-1.64577 -0.61671 -0.08972 0.55792 2.73737
Coefficients:
Estimate Std. Error t value Pr(>|t|)
(Intercept) 32.446570 10.076895 3.220 0.00135 **
year -0.016345 0.005037 -3.245 0.00123 **
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