confidence interval for a factor coefficient in R -


i estimated following poisson regression in r:

poissmod2 <- glm(aerobics$y ~ factor(aerobics$x1)  + aerobics$x3 + aerobics$x4,                  family = poisson))

no problem far. next step, however, determine 95% confidence interval aerobics$x1.

i have tried following 2 codes:

confint.default(poissmod2,"aerobics$x1")

and

confint.default(poissmod2,"factor(aerobics$x1)")

for both codes confidence interval 'na-na'... code, however, seems work non-factor variables.

does have idea doing wrong?


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