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Zero-adjusted negative binomial distributions #86
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Looks great, thank you! |
Wonderful, thanks for the quick merge. More PRs coming up... ;-) |
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To complement the hurdle Poisson and zero-inflated Poisson distribution I have added now the infrastructure for the corresponding negative binomial distributions. Additionally, I included zero-truncated Poisson and negative binomial distributions (i.e., distributions left-truncated at zero).
d
/p
/q
/r
functions (and documentation) forhnbinom
,zinbinom
,ztnbinom
, andztpois
similar to the correspondingnbinom
andpois
functions from base R.HurdleNegativeBinomial()
,ZINegativeBinomial()
,ZTNegativeBinomial()
, andZTPoisson()
distribution constructors along with the corresponding documentation.skewness()
, andkurtosis()
for which I didn't manage to work out the theoretical equations (yet).prodist()
extractors forhurdle()
,zeroinfl()
, andzerotrunc()
objects from either thepscl
package or thecountreg
package (No additional dependencies are created because only the correspondingpredict()
method needs to be called.)