Description Details qra functions Author(s)

The qra package provides the functions: checkDisp, getRho, extractLT, getScaleCoef, scaleLocAdjust, fieller, gpsWithin, varRatio, foldp, graphSum, fpower

The three vignettes provide examples of the use of the functions.

`fieller`

: Calculates lethal dose estimates, using Fieller's
formula to calculate 95
of the functions noted below are useful ancillaries to `fieller`

and `fieller2`

, notably `foldp`

, `fpower`

, `extractLT`

,
and `getScaleCoef`

.

`fieller2`

: Use when a folded power link has been used.
See `fpower`

.

`extractLT`

: Obtains complete set of LT or LD estimate, when it is
convenient to get results from several models at the same time.

`foldp`

: Calculates the ratio of `p+eps`

to `1-code+eps`

`getRho`

Extracts estimates of the intra-class
correlation from a glmmTMB model object with betabinomial error.
See the vignette [timeMortality] for details of the parametization
used for the `betabinomial`

error.

`getScaleCoef`

: Extracts the scale coefficients from a vector
that has been scaled using `scale`

, as needed so that the scaling
can be undone.

`gpsWithin`

Renumbers group identifiers so that they run from
1 to number of groups within for each level of the specified factor.

`scaleLocAdjust`

: Returns, for `glmmTMB`

models with a
betabinomial error, dispersion factors (i.e., multipliers for the
binomial variance) as functions of predicted values.

`varRatio`

: Returns a first order approximation to the variance
of the $y$-ordinate to slope ratio. This is used in the
`type="Delta"`

approximation, for calculation of LT and LD
confidence intervals. Primarily, this is provided for purposes
of comparison, to make it easy to show how poor the approximation
can be, and to warn against its general dewvuse!

**Maintainer**: John Maindonald john@statsresearch.co.nz (ORCID)

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