getGroups

The continuous variable to be split

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

If set to TRUE, builds equidistant interval, otherwise (default)
with equal number of observations

equidistant

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.

Conventional methods for producing standard scores in psychometrics or biometrics
are often plagued with "jumps" or "gaps" (i.e., discontinuities) in norm tables and low
confidence for assessing extreme scores. The continuous norming method introduced by A.
Lenhard et al. (2016, <doi:10.1177/1073191116656437>; 2019, <doi:10.1371/journal.pone.0222279>) and generates continuous test norm
scores on the basis of the raw data from standardization samples, without requiring
assumptions about the distribution of the raw data: Norm scores are directly established
from raw data by modeling the latter ones as a function of both percentile scores and an
explanatory variable (e.g., age). The method minimizes bias arising from sampling and
measurement error, while handling marked deviations from normality, addressing bottom
or ceiling effects and capturing almost all of the variance in the original norm data
sample. An online demonstration is available via <https://cnorm.shinyapps.io/cNORM/>.

getGroups: Determine groups and group means

Description

Usage

Arguments

Value

Examples