0
votes
1answer
37 views

Poisson Regression Residuals

I'm modeling the number of doctor visits (a count variable) on factors such as income, chronic condition, insurance, etc. I use the canned Stata command ...
1
vote
0answers
28 views

Stata's -margins- shows negative predicting value for count model

I am modeling "Innovation" counts over "HHI" and "squared HHI" with fixed effect poisson model. (My sample is unbalanced, small & wide one.) I am aware of that I can use Stata's -margins- command ...
2
votes
1answer
232 views

Using Poisson instead of transforming the data

I note with interest an article which has been suggested to me over here: http://blog.stata.com/tag/poisson-regression/ I have the problems outlined in this blog - namely zeros (in the independent ...
1
vote
0answers
130 views

Comparing ln(y) =bX vs. OLS and other count data models

My data is a balanced panel: 12 years $\cdot$ 600 ids $\cdot$ 12 months = 86,400 observations. For about 150 of my 600 ids, at a certain point in this 12 year period a treatment is applied switching ...
6
votes
3answers
2k views

Incidence Rate Ratios in R (poisson regression)

I would like to run a poisson regression and have R calculate incidence rate ratios, much like the irr option for poisson regression in stata. If anyone can advise how to do this I would be grateful. ...
4
votes
1answer
475 views

Poisson regression instead of log transformation of a continuous outcome variable? [duplicate]

Possible Duplicate: Poisson regression vs. log-count least-squares regression? This post got me to thinking about when it makes sense to use poisson regression instead of log transforming a ...