# Tagged Questions

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### I log transformed my dependent variable, can I use GLM normal distribution with LOG link function?

First of all, thank you for the great forum! I have a question concerning Generalized Linear Models (GLM). My dependent variable (DV) is continuous and not normal. So I log transformed it (still not ...
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### Transforming nonlinearity in genearlized linear models

Are the buldging rules applicable in generalized linear models? Specifically, to transform the independent variables? I've only seen it disscused/used in OLS regression. Thanks in advance
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### GLM vs square root data transformation

I am currently analysing some pretty awful/awkward data on the abundance of fish under three different "Hydro-Regimes" (5 abundance measurements for each regime - Short/Medium/Long). The current ...
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### Why is the square root transformation recommended for count data?

It is often recommended to take the square root when you have count data. (For some examples on CV, see @HarveyMotulsky's answer here, or @whuber's answer here.) On the other hand, when fitting a ...
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### GLM quasi family with log transformation?

I am working on my thesis analysis, and I have some error data that's right-skewed. I log-transformed it and ran glm on it (gaussian, identity in R) weighted by sample size, and my data is still ...
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### Can I put Log(Y) as a dependent variable in a count data model

I have count data passenger as Y. The data look like this, as many of the values are 1 (about 18%.) Does it make sense that I take a log of it, and take it as a dependent variable in a generalized ...
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### Interpretation of a log likelihood function for PROC NLMIXED in SAS

I have a data set of skewed nutrient intake values, from around 7800 individuals, of whom around 3000 had two measures of daily nutrient intake (the others only had one measure), so this is a repeated ...
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### Running transformed data with a Generalized Linear Model in SPSS

I am running a generalized linear model in SPSS on data highly skewed to the right with a bunch of zeroes (average # caterpillars per tree species branch sampled) so I decided to use the Tweedie ...
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### Are ecologists the only ones who didn't know that the arcsine is asinine?

Proportion, ratio, and percentage data is very common in ecology (eg, % of flowers pollinated, male:female sex ratio, % mortality in response to a treatment, % of leaf eaten by an herbivore). An ...
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### Transformation to fit gamma distribution for glm

The data simulated below has a maximum value of 4 and is interestingly skewed. The maximum of 4 is a limitation imposed by the instrument used and the data is semi-discrete, i.e., there are a ...