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5 votes

Why does the multivariate data generated by a copula in R not exhibit the prespecified correlation?

Three things to note: Pearson correlation is not preserved through strictly monotonic transformation of the margins, including marginal transformations used with copulas, except in special cases. ...
Glen_b's user avatar
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4 votes

Why does the multivariate data generated by a copula in R not exhibit the prespecified correlation?

No, the correlation that you specify is on the latent Gaussian scale. The correlation will typically (?always) be lower for the observed variables with the specified distributions
Thomas Lumley's user avatar
1 vote

What is the best test to run to compare presence/absence of something between sampling locations?

I see two possibilities: A separate logistical regression per pathogen, with site as a predictor. A large model with both pathogen and site as predictors. In this case, you should account for the ...
Stephan Kolassa's user avatar
1 vote
Accepted

Test whether my new method's type I error rate correctly matches chosen alpha

Empirical validation of null-rejection methods tldr: in null-rejection testing, the empirical rate is typically different than the nominal rate (due to approximations), but it only matters if it is ...
Guillaume Dehaene's user avatar
1 vote

I would like some insight into what I have been working on here

Summarizing comments into an answer: When a potential customer opens the door and allows the salesperson into the house, then the salesperson must take the time to make the sales pitch. If the pitch ...
EdM's user avatar
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