otzeta: One-truncated Zeta Distribution Family Function In VGAMdata: Data Supporting the 'VGAM' Package

 otzeta R Documentation

One-truncated Zeta Distribution Family Function

Description

Estimates the parameter of the 1-truncated zeta distribution.

Usage

```otzeta(lshape = "loglink", ishape = NULL, gshape = exp((-4:3)/4), zero = NULL)
```

Arguments

 `lshape, ishape, gshape, zero` Same as `zetaff`.

Details

The 1-truncated zeta distribution is the ordinary zeta distribution but with the probability of one being 0. Thus the other probabilities are scaled up (i.e., divided by 1-P[Y=1]). The mean is returned by default as the fitted values. More details can be found at `zetaff`. Multiple responses are handled.

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

`Otzeta`, `zetaff`, `oizeta`, `diffzeta`, `zeta`, `dzeta`, `hzeta`, `zipf`.

Examples

```## Not run: odata <- data.frame(x2 = runif(nn <- 1000))  # Artificial data
odata <- transform(odata, shape = loglink(-0.25 + x2, inverse = TRUE))
odata <- transform(odata, y1 = rotzeta(nn, shape))
with(odata, table(y1))
ofit <- vglm(y1 ~ x2, otzeta, data = odata, trace = TRUE, crit = "coef")
coef(ofit, matrix = TRUE)

## End(Not run)```

VGAMdata documentation built on March 18, 2022, 8:03 p.m.