calcPolyInLBase

The raw value (subtracted from the intercept)

The cNORM regression model coefficients

coeff

The cNORM regression model power parameter

The function is an inline for searching zeros in the inverse regression
function. It collapses the regression function at a specific age and simplifies
the coefficients.

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/>.

Wolfgang Lenhard

calcPolyInLBase: Internal function for retrieving regression function coefficients at specific age

Description

Usage

Arguments

Value