| gof-dr4pl {dr4pl} | R Documentation |
Perform the goodness-of-fit (gof) test for the 4PL model.
Description
Perform the goodness-of-fit (gof) test for the 4PL model when there are at least two replicates for each dose level.
Usage
## S3 method for class 'dr4pl'
gof(object, n.signif.digit = 4, ...)
Arguments
object |
An object of the dr4pl class. |
n.signif.digit |
Number of significant digits after the decimal point to be printed. The default value is 4, but users can change the value on their own. |
... |
dots for future extensions |
Details
Perform a goodness-of-fit (gof) test for the goodness of the 4PL models for dose-response data. There should be at least two replicates at each dose level. The test statistic follows the F distribution with degress of freedom (n - 4) and (N - n) where N stands for the total number of observations and n stands for the number of dose levels. For detailed explanation of the method, please refer to Subsection 2.1.5 of Seber and Wild (1989).
Value
A list of results in the order of a F-statistic value, p-value and a degree of freedom.
References
Seber GAF, Wild CJ (1989). Nonlinear regression, Wiley Series in Probability and Mathematical Statistics: Probability and Mathematical Statistics. John Wiley \& Sons, Inc., New York. ISBN 0-471-61760-1, doi: 10.1002/0471725315, http://dx.doi.org.libproxy.lib.unc.edu/10.1002/0471725315.
Examples
obj.dr4pl <- dr4pl(Response ~ Dose, data = sample_data_4) # Fit a 4PL model to data
gof(obj.dr4pl) # Print the goodness-of-fit test results