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Calculates the derivative of the location / norm value from the regression model with the first derivative as the default. This is useful for finding violations of model assumptions and problematic distribution features as f. e. bottom and ceiling effects, non-progressive norm scores within an age group or in general #' intersecting percentile curves.
derive(model, order = 1, covariate = NULL)The regression model or a cnorm object
The degree of the derivate, default: 1
In case, a covariate has been used, please specify the degree of the covariate / the specific value here.
The derived coefficients
Other model:
bestModel(),
checkConsistency(),
cnorm.cv(),
modelSummary(),
print.cnorm(),
printSubset(),
rangeCheck(),
regressionFunction(),
summary.cnorm()
# NOT RUN {
normData <- prepareData(elfe)
m <- bestModel(normData)
derivedCoefficients <- derive(m)
# }
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