lognb | R Documentation |
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lognb(m, shape, scale)
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Newton
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##---- Should be DIRECTLY executable !! ---- ##-- ==> Define data, use random, ##-- or do help(data=index) for the standard data sets. ## The function is currently defined as function( m, shape, scale ) { ## negative binomial mass function; log ## make sure m >= 0, shape >0, scale > 0 ## either m may be a vector, and shape and scale should be scalers ## or m may be a scaler, and shape and scale are vectors tmp1 <- lgamma(m+shape) - lgamma(shape) - lgamma(m+1) tmp2 <- -shape*log(scale+1) tmp3 <- m*( log( scale ) - log( scale + 1 ) ) ll <- tmp1 + tmp2 + tmp3 return( ll ) }
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