transformPvs

Helper function to Transform PVs onto a new metric
(e.g., PISA Mean = 500, SD = 100).
Uses the method described in the PISA 2012 technical manual.

Extends 'ACER ConQuest' through a family of functions
designed to improve graphical outputs and help with advanced analysis
(e.g., differential item functioning). Allows R users to call
'ACER ConQuest' from within R and read 'ACER ConQuest' System Files
(generated by the command `put` <https://conquestmanual.acer.org/s4-00.html#put>).
Requires 'ACER ConQuest' version 5.33.2 or later.
A demonstration version can be downloaded from <https://shop.acer.org/acer-conquest-5.html>.

Dan Cloney

conquestr

An R Package to Extend 'ACER ConQuest'

Ray Adams

transformPvs function

<dl><dt>x</dt>
<dd>A concatenated vector of varnames in data, PV1, PV2, ..., PVm.</dd>
<dt>mT</dt>
<dd>The desired mean of the PVs</dd>
<dt>sdT</dt>
<dd>The desired sd of the PVs</dd>
<dt>weights</dt>
<dd>The name of the weight variable in 'data' used to
caulculate the mean and SD accross the PVs</dd>
<dt>data</dt>
<dd>The data frame that contains the PVs and weights.</dd>
<dt>addToDf</dt>
<dd>A Boolean, if TRUE, the transformed PVs are coerced
into the DF, data, with name data$x_T (not yet implmented).</dd>
<dt>debug</dt>
<dd>A temporary flag to spit-out objects to global env for chekcing.
Will be removed when pushed to CRAN</dd></dl>

Arguments

transformPvs — transformPvs

<dl>

<dt>x</dt>
<dd>A concatenated vector of varnames in data, PV1, PV2, ..., PVm.</dd>


<dt>mT</dt>
<dd>The desired mean of the PVs</dd>


<dt>sdT</dt>
<dd>The desired sd of the PVs</dd>


<dt>weights</dt>
<dd>The name of the weight variable in 'data' used to
caulculate the mean and SD accross the PVs</dd>


<dt>data</dt>
<dd>The data frame that contains the PVs and weights.</dd>


<dt>addToDf</dt>
<dd>A Boolean, if TRUE, the transformed PVs are coerced
into the DF, data, with name data$x_T (not yet implmented).</dd>


<dt>debug</dt>
<dd>A temporary flag to spit-out objects to global env for chekcing.
Will be removed when pushed to CRAN</dd>

</dl>

transformPvs: transformPvs

Description

Usage

Value

Arguments