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Results tagged with ecology
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user 173082
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.
1
vote
How to use a mathematical model for data analysis in R
The mean-yield per plant is strictly positive, which means we can deal with its logarithm (as a real number). The deterministic version of the model can be usefully rewritten as:
$$\ln W_{A} = \ln W …
- 133k
3
votes
Accepted
Difference between NA and None in biological dataset
You are dealing with a situation where you have variables (distance to log, diameter of nearest log) that only have meaning in the presence of a previous variable condition (log is present). You can …
- 133k
1
vote
nls() singular gradient matrix at initial parameter estimates error
Minor point: Don't try to recreate the exponential function in your code
The excellent answer by whuber shows how you can use the data to choose better starting values for your iteration and how you …
- 133k
6
votes
Camera trapping and the Poisson distribution
It is almost never a good idea to use a Poisson distribution (or any other single parameter distribution) for modelling --- this distribution fixes the variance in relation to the mean, which means th …
- 133k
10
votes
Accepted
How do I present averages from different sample sizes across years?
The usual thing to do here would be to include "error bars" around your sample average giving a confidence interval for the true average from the sampled data each year. For binary data you can get a …
- 133k