R: Calculation of backfit values from a fitted dose-response...

backfit {drc} | R Documentation

## Calculation of backfit values from a fitted dose-response model

### Description

By inverse regression backfitted dose values are calculated for the mean response per dose.

### Usage

    backfit(drcObject)

### Arguments

`drcObject` | an object of class 'drc'.

### Value

Two columns with the original dose values and the corresponding backfitted values using the fitted dose-response model. For extreme dose values (e.g., high dose ) the backfitted values may not be well-defined (see the example below).

### Author(s)

Christian Ritz after a suggestion from Keld Sorensen.

### References

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### See Also

A related function is `ED.drc`.

### Examples

    ryegrass.LL.4 <- drm(rootl~conc, data=ryegrass, fct=LL.4())

    backfit(ryegrass.LL.4)

[Package drc version 3.0-1 Index]