otlog: One-truncated Logarithmic Distribution

In VGAMdata: Data Supporting the 'VGAM' Package

One-truncated Logarithmic Distribution

Description

Estimating the (single) parameter of the 1-truncated logarithmic distribution.

Usage

otlog(lshape = "logitlink", gshape = ppoints(8), zero = NULL)

Arguments

lshape, gshape, zero

Same as logff. See CommonVGAMffArguments for information.

Details

The 1-truncated logarithmic distribution is a logarithmic distribution but with the probability of a one being zero. The other probabilities are scaled to add to unity. Some more details can be found at logff. Multiple responses are permitted.

Value

An object of class "vglmff" (see vglmff-class). The object is used by modelling functions such as vglm, and vgam.

Author(s)

T. W. Yee

See Also

Gaitdlog, Otlog, logff, oalog, oilog, simulate.vlm.

Examples

## Not run: 
odata <- data.frame(y1 = rotlog(1000, shape = logitlink(1/3, inv = TRUE)))
ofit <- vglm(y1 ~ 1, otlog, data = odata, trace = TRUE, crit = "c")
coef(ofit, matrix = TRUE)
Coef(ofit)
with(odata,
    hist(y1, shape = TRUE, breaks = seq(0.5, max(y1) + 0.5, by = 1),
         border = "blue"))
x <- seq(1, with(odata, max(y1)), by = 1)
with(odata, lines(x, dotlog(x, Coef(ofit)[1]), col = "orange",
                  type = "h", lwd = 2)) 
## End(Not run)

VGAMdata documentation built on April 3, 2025, 6:49 p.m.