slope.contrast

Computes the contrast coefficients that are needed to estimate the slope of
a line in a one-factor design with a quantitative factor.

Implements confidence interval and sample size methods that
are especially useful in psychological research. The methods can be
applied in 1-group, 2-group, paired-samples, and multiple-group designs
and to a variety of parameters including means, medians, proportions,
slopes, standardized mean differences, standardized linear contrasts
of means, plus several measures of correlation and association.
Confidence interval and sample size functions are given for single
parameters as well as differences, ratios, and linear contrasts of
parameters. The sample size functions can be used to approximate the
sample size needed to estimate a parameter or function of parameters
with desired confidence interval precision or to perform a variety of
hypothesis tests (directional two-sided, equivalence, superiority,
noninferiority) with desired power. For details see: Statistical Methods
for Psychologists, Volumes 1 – 4, <https://dgbonett.sites.ucsc.edu/>.

Douglas G. Bonett

statpsych

Statistical Methods for Psychologists

Robert J. Calin-Jageman

slope.contrast function

<dl><dt>x</dt>
<dd>vector of numeric factor levels</dd></dl>

Arguments

Contrast coefficients for the slope of a quantitative factor — slope.contrast

<dl>

<dt>x</dt>
<dd>vector of numeric factor levels</dd>

</dl>

slope.contrast: Contrast coefficients for the slope of a quantitative factor

Description

Usage

Value

Arguments

Examples