# Assessing the model fit

### Description

Checking the fit of dose-response model by means of formal significance tests or graphical procedures.

### Usage

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### Arguments

`object` |
object of class 'drc' |

`test` |
character string defining the test method to apply |

`method` |
character string specifying the method to be used for assessing the model fit |

### Details

Currently two methods are available. For continuous data the clasical lack-of-fit test is applied (Bates and Watts, 1988). The test compares the dose-response model to a more general ANOVA model using an approximate F-test. For quantal data the crude goodness-of-fit test based on Pearson's statistic is used.

None of these tests are very powerful. A significant test result is more alarming than a non-significant one.

### Value

An object of class 'anova' which will be displayed in much the same way as an ordinary ANOVA table.

### Author(s)

Christian Ritz

### References

Bates, D. M. and Watts, D. G. (1988)
*Nonlinear Regression Analysis and Its Applications*,
New York: Wiley \& Sons (pp. 103–104).

### Examples

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