equate_2.0-3 (2014-11-1)
o Functionality has been added for equating under
a multiple anchor test design. New methods
include nominal weights and Tucker multivariate
and multivariate frequency estimation for
Braun/Holland and equipercentile equating.
o The freqtab class has been restructured, with a
new, more general approach to the construction
and manipulation of multivariate frequency
tables. A freqtab object is now a simple table
array rather than a data.frame.
o formula method added for loglinear
presmoothing via the presmoothing function.
o Loglinear presmoothing supports multivariate
frequency distributions, e.g., distributions
with multiple anchor tests. Polynomials and
interactions can be specified using a matrix
of power terms, in addition to the score function
or the degree (now 'degrees') argument.
o Impossible scores can be removed before loglinear
presmoothing using the 'rmimpossible' argument.
o Model comparisons for loglinear presmoothing
are based on the 'models' argument, which is
a numeric vector with different levels specifying
the sequential models to be fitted. Also, when
'stepup' is TRUE, the default models are now chosen
based on common powers across variables.
o The default legend for plotting bootstrap output
was fixed.
o Summary method for bootstrap output can take
a subset of the score scale. The method was also
updated to include weighted mean RMSE.
equate_2.0-2 (2014-2-21)
o Some minor cleanup.
o plot.bootstrap was fixed for objects
containing output for only one equating.
o print method was added for bootstrap objects.
equate_2.0-1 (2014-2-1)
o points.freqtab fixed to handle plotting
frequencies that are all the same.
o Bug fixed in printing and summarizing
equipercentile output.
o Score conversion with chained equipercentile
output now works. Previously, there was an
error in how the smoothing method was
interpreted.
o Score conversion with equipercentile now
works when x only contains values with
percentile ranks of 0 or 1. Previously, this
produced an error.
equate_2.0-0 (2014-1-7)
o New "general linear" equating type.
o Single-group equating is now supported,
where "x" is bivariate and "y" is missing.
o Equipercentile equating will accept a
rescaled "y" scale, e.g., with non-integer
scores. The score increment still must be
constant across the scale.
o The identity linking function is modified
using the arguments "lowp" and "highp", which
were previously only used in circle-arc
equating.
o "highp" is now used to find "Ky" in
equipercentile equating. The "Ky" argument is
no longer used.
o Identity equating is now considered a linear
equating type, though it is still specified
with type = "identity".
o New "composite" object class is used to create
composite equatings, i.e., weighted combinations
of two or more other equating functions.
Synthetic equating, combining an identity
function with another function, is no longer
supported within the equate function.
o "px" and "fx" are now internal, meaning a help
file is no longer included.
o "yx" is no longer included separately in equating
output. Equated scores can be accessed through
"concordance$yx" instead.
o Analytical standard errors are under
construction and not currently included in
equating output.
o For loglinear smoothing within the equate
function, a single "scorefun" argument has
replaced the separate "xscorefun" and "yscorefun"
arguments. The equate function cannot be used
to smooth "x" and "y" with different score
functions.
o Bug in the calculation of the intercept in
chained mean and linear equating was fixed.
o Circle-arc equating with nonequivalent groups
was fixed.
o Chained equipercentile score conversion was
fixed.
o Score conversion with frequency estimation
equipercentile was fixed.
o "summary" method replaces "descript" for
summarizing frequency tables.
o Additional descriptive statistics are now
included in equating output.
o Levine true score equating printed output
was fixed.
o Bootstrap standard error calculation was fixed
for scales of different lengths.
o "plot.equate" was function modified.
o "plot.freqtab" was function updated to improve
plotting logliner presmoothing results.
o "freqtab" function was updated to handle missing
data.
equate_1.2-0 (2013-9-20)
o Package vignette updated
o freqtab function updated to accept item response
data
o loglinear function updated - original estimation
algorithm has been dropped, and the function is
now a wrapper for 'glm'
o new function plot.equate, for plotting and
comparing equating results
o equate and other functions modified to handle
linking of forms with different score scales
o Bug fixed in the frequency estimation method,
where marginal frequencies are zero
o Help files updated
equate_1.1-4 (2011-8-23)
o Package vignette updated
o Print method fixed
o equate function fixed for equipercentile
conversion of a vector of scores to the scale
defined in a previous equating
equate_1.1-3 (2011-2-10)
o verbose option added to loglinear smoothing
o equate function updated to support conversion
of a vector of scores to the scale defined
in a previous equating
equate_1.1-2 (2011-1-7)
o Circle-arc equating fixed
o Package vignette updated
equate_1.1-1 (2010-12-15)
o New equating type: synthetic,
a combination of any other equating type and
identity equating
o Circle-arc equating fixed
o skew.freqtab and kurt.freqtab fixed
equate_1.1-0 (2010-11-15)
o plot.freqtab updated
o New equating type: nominal weights
o loglinear smoothing function fixed
equate_1.0-0 (2010-03-24)
o New package vignette introduces concepts and
demonstrates basic functionality
o New equating type: circle-arc
o New equating methods: Levine true score,
Braun/Holland, and chained equating
o equate function converts a vector of scores
to another scale based on output from a
previous equating
o Proportional weighting when estimating the
synthetic distribution, using argument 'w'
o Layout of freqtab function changed
o Simple plotting method added for univariate
and bivariate frequency tables
o se.boot function returns matrix of bootstrap
replications
o Equipercentile equating updated to handle
frequency tables missing substantial amounts
of data
o Functions added for descriptive statistcs of
frequency tables
o Rd files updated and consolidated
equate_0.1-1 (2009-11-05)
o Functions loglinear and freqbump extended to
handle smoothing of bivariate distributions
o equating functions accept scores only as
frequency tables (univariate or bivariate)
o Updated DESCRIPTION and Rd files
equate_0.1-0 (2009-11-01)
o initial release on CRAN