sim_unimodal

Simulate test scores from a negative-hypergeometric (beta-binomial) distribution, according to
Keats &amp; Lord (1962).

Contains functions to perform various models and
methods for test equating. It currently implements the traditional
mean, linear and equipercentile equating methods. Both IRT observed-score
and true-score equating are also supported, as well as the mean-mean,
mean-sigma, Haebara and Stocking-Lord IRT linking methods.
It also supports newest methods such that local equating, kernel
equating (using Gaussian, logistic, Epanechnikov, uniform and adaptive
kernels) with presmoothing, and IRT parameter linking methods based on
asymmetric item characteristic functions. Functions to obtain both
standard error of equating (SEE) and standard error of equating differences
between two equating functions (SEED) are also implemented for the kernel method of
equating.

Jorge Gonzalez

SNSequate

Standard and Nonstandard Statistical Models and Methods for Test
Equating

Daniel Leon Acuna

sim_unimodal function

<dl> <dt>n</dt>
<dd>Size of the resulting sample.</dd> <dt>x_mean</dt>
<dd>Mean of the target distribution.</dd> <dt>x_var</dt>
<dd>Variance of the target distribution.</dd> <dt>N_item</dt>
<dd>Number of items in the test.</dd> <dt>seed</dt>
<dd>Optional. Seed for the random number generator.</dd> <dt>name</dt>
<dd>Optional. Generate X and Y scores from the data according 5 of the proposed distributions 
 in Keats &amp; Lord (1967). Overrides any other previous parameter input set.</dd></dl>

Arguments

Daniel Leon Acuna, <a href="/link/dnacuna%40uc.cl?package=SNSequate&version=1.3-4" data-mini-rdoc="SNSequate::dnacuna@uc.cl">dnacuna@uc.cl</a>

Author

Simulate test scores. — sim_unimodal

<dl>

 <dt>n</dt>
<dd>Size of the resulting sample.</dd>

 <dt>x_mean</dt>
<dd>Mean of the target distribution.</dd>

 <dt>x_var</dt>
<dd>Variance of the target distribution.</dd>

 <dt>N_item</dt>
<dd>Number of items in the test.</dd>

 <dt>seed</dt>
<dd>Optional. Seed for the random number generator.</dd>

 <dt>name</dt>
<dd>Optional. Generate X and Y scores from the data according 5 of the proposed distributions 
 in Keats &amp; Lord (1967). Overrides any other previous parameter input set.</dd>

</dl>

Daniel Leon Acuna, <a href='mailto:dnacuna@uc.cl'>dnacuna@uc.cl</a>

sim_unimodal: Simulate test scores.

Description

Usage

Value

Arguments

Author

Details

References

Examples