Re: [R] Theta from negative binomial regression and power_NegativeBinomiial from PASSED

2023-09-15 Thread Ben Bolker
Yes, theta is the 'size' or overdispersion parameter. Sometimes also denoted as k. Wikipedia discusses this parameterization in the paragraph starting "In negative binomial regression ..." (but they call this parameter r rather than theta or k). You can also see this in MASS on google

Re: [R] Theta from negative binomial regression and power_NegativeBinomiial from PASSED

2023-09-15 Thread Ivan Krylov
On Fri, 15 Sep 2023 01:51:27 + "Sorkin, John" wrote: > What is theta, and how does it relate to the parameters of the > negative binomial distribution? Plugging the p (the success probability) and the r (the number of successes until the experiment is stopped) from the Wikipedia article

[R] Theta from negative binomial regression and power_NegativeBinomiial from PASSED

2023-09-14 Thread Sorkin, John
Colleagues, I want to use the power_NetativeBinomial function from the PASSED library. The function requires a value for a parameter theta. The meaning of theta is not given in the documentation (at least I can�t find it) of the function. Further the descriptions of the negative binomial