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Results tagged with ecology
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user 28500
Ecology is the study of how organisms interact with their environment & each other. Ecology uses some specialized statistical techniques (eg ordination methods). Use this tag to indicate applications of statistics that are unique to ecology or that require a recognition of the ecological context.
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is it possible to use a vector object a dependent variable in GLM?
There's more to say about the current answer from @Circus pygargus than fits into a comment.
First, the answer might be correct about glm() models not allowing vectors as outcomes, except that for bin …
- 101k
2
votes
Analysis of a dataset including dichotomial, ordinal and % data
Your outcome variables, the relative abundance of phyla, all add up to 1. So your outcome is really a set of compositional data. One issue: although your data show 5 different phyla, you only have 4 l …
- 101k
2
votes
Accepted
ecologists, if I have diversity data (Shannon's index) for years and sites how can I produce...
The plug-in estimator of Shannon entropy suffers from an inherent bias that is worse with smaller samples. See this answer and its links for details. That's particularly the case if some species were …
- 101k
1
vote
Accepted
Linear regression on clustering result
Instead of jumping right into separate linear models for each of your pre-defined groups based on body-weight responses to air temperature, step back and do exploratory data analysis. Look at and play …
- 101k
1
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How to choose number of sites and number sub-sites within each site in planning stage of a s...
Whether or not you consider this from a Bayesian perspective, the suggestion by Camille Gontier (+1) to use simulations is probably your most useful approach.
The risk at one extreme is having unreali …
- 101k
3
votes
Accepted
Understanding offsets for continuous variables
It's probably not a good idea to impose your a priori expectation about an intercept on a model, just like it's generally not a good idea to force a linear regression through the origin. It sounds lik …
- 101k
2
votes
Accepted
cloglog vs logistic regression survival analysis
The link functions can differ substantially:
I haven't checked your code (and coding questions per se are off-topic here), but if any probabilities of an event within a time period (given no event in …
- 101k