getGroups

Helps to split the continuous explanatory variable into groups and assigns
the group mean. The groups can be split either into groups of equal size (default)
or equal number of observations.

A comprehensive toolkit for generating continuous test norms in
psychometrics and biometrics, and analyzing model fit. The package offers both
distribution-free modeling using Taylor polynomials and parametric modeling
using the beta-binomial distribution. Originally developed for achievement
tests, it is applicable to a wide range of mental, physical, or other test
scores dependent on continuous or discrete explanatory variables. The package
provides several advantages: It minimizes deviations from representativeness
in subsamples, interpolates between discrete levels of explanatory variables,
and significantly reduces the required sample size compared to conventional
norming per age group. cNORM enables graphical and analytical evaluation of
model fit, accommodates a wide range of scales including those with negative
and descending values, and even supports conventional norming. It generates
norm tables including confidence intervals. It also includes methods for
addressing representativeness issues through Iterative Proportional Fitting.

Wolfgang Lenhard

cNORM

Continuous Norming

Alexandra Lenhard

Sebastian Gary

WPS publisher 

getGroups function

<dl><dt>x</dt>
<dd>The continuous variable to be split</dd>
<dt>n</dt>
<dd>The number of groups; if NULL then the function determines a number
of groups with usually 100 cases or 3 &lt;= n &lt;= 20.</dd>
<dt>equidistant</dt>
<dd>If set to TRUE, builds equidistant interval, otherwise (default)
with equal number of observations</dd></dl>

Arguments

Determine groups and group means — getGroups

<dl>

<dt>x</dt>
<dd>The continuous variable to be split</dd>


<dt>n</dt>
<dd>The number of groups; if NULL then the function determines a number
of groups with usually 100 cases or 3 &lt;= n &lt;= 20.</dd>


<dt>equidistant</dt>
<dd>If set to TRUE, builds equidistant interval, otherwise (default)
with equal number of observations</dd>

</dl>

getGroups: Determine groups and group means

Description

Usage

Value

Arguments

Examples