The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » sci.math.* » sci.stat.math

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Discrepancy in estimating goodness of Poisson GLM
Replies: 15   Last Post: Jan 18, 2012 8:17 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Eric Goodwin

Posts: 11
Registered: 1/15/12
Re: Discrepancy in estimating goodness of Poisson GLM
Posted: Jan 16, 2012 8:04 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

Thanks David.

Granted, every model is wrong. No data drawn from the real world is truly Poisson, but it's an approximation to the distribution of some datasets, and I believe mine adequately conform. It's even going to be hard to test for conformity to a Poisson distribution with such a small sample, isn't it? At least, the test won't be conclusive-conclusive.

I could alternatively transform my data, and use a straight OLS regression, then report an R^2 for that approximation. Rich mentioned taking the square root of the data, which is the first time I've heard of using this transform for count data. Is that choice of transform a response to:
O?Hara, R. B. and Kotze, D. J. (2010), Do not log-transform count data. Methods in Ecology and Evolution, 1: 118?122.


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.