6k views

Why do we use GLM? [duplicate]

I'm trying to justify using of GLM model in my project instead of a simple linear regression. A lot of sources that I've seen contain the statement that "GLM allow us to build regression models for ...
67 views

Modeling count data [duplicate]

Why do count data need to be modeled differently from the standard linear regression model ? Any simple example will suffice.
8k views

Goodness of fit and which model to choose linear regression or Poisson

I need some advice regarding two main dilemmas in my research, which is a case study of 3 big pharmaceuticals and innovation. Number of patents per year is the dependent variable. My questions are ...
2k views

Interpreting regression with transformed variables

I have conducted a linear regression analysis with four variables. The response, say $\#$ of eggs per 2000 hens, and one of the predictors, say temperature change, are highly skewed. I have hence ...
1k views

Appropriate application of Poisson regression?

I am looking to predict the number of shots that are going to be made by soccer players in their next game. Currently, I use multiple linear regression, where I regress my entire data set (...
1k views

Using linear regression for count data - will this introduce bias?

Say I am fitting a model to Poisson count data, but I am only interested in estimating the mean of the count variable. I understand a ordinary linear regression is a good approximation when the ...
227 views

Logistic regression across groups

When running a logit/probit model for particular sets of outcomes on a set of participants (whether they did a certain behavior at least two times), how can one best control for differences when the ...
350 views

Which statistical model should I apply when the DV is a count variable? [duplicate]

What is best statistical model to assess effect of habitat type and year (categorical factors), and ...
182 views

How do I correctly compare bacterial counts from mice with different genotypes?

As far as I know, CFU counts from bacterial suspensions should approximately follow a Poisson distribution. So in order to perform a One-way Anova, a mathematical transformation to achieve normality ...
98 views

What are the signs that a classification just wont work?

Basically, I've a simple question: Are there signs which tells me that I just can't classify my data? To make things clear, I've a dataset whereby i try to predict the amount of tires changes. But ...
62 views

How to compare counts to find out which are significantly different

I have a one way unbalanced anova say with a levels. My task is to find out if we have significantly different COUNTS at the various a levels. I tried this : I compute the sum of the number of cases ...
39 views

What test should I use for my data?

I have one categorical predictor coded as 0 or 1 for a sample of about 290. Based on some research, I want to control for 4 covariates. One is continuous (age) and the rest are categorical (gender, ...