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\name{MemoryDeficits}
\alias{MemoryDeficits}
\title{Memory Deficits in Psychiatric Patients}
\description{
Response frequencies of 96 patients who took part in a pair-clustering
experiment to assess their memory deficits.
}
\usage{data("MemoryDeficits")}
\format{
A data frame containing 576 observations on 7 variables.
\describe{
\item{ID}{Participant ID.}
\item{group}{Factor with four levels specifying patient or control group
of participant.}
\item{trial}{Trial number from 1 to 6.}
\item{E1}{Number of pairs recalled adjacently.}
\item{E2}{Number of pairs recalled non-adjacently.}
\item{E3}{Number of single pair members recalled.}
\item{E4}{Number of non-recalled pairs.}
}
}
\details{
Riefer, Knapp, Batchelder, Bamber and Manifold (2002) report a study on
memory deficits in schizophrenic (n = 29) and organic alcoholic (n = 21)
patients who were compared to two matched control groups (n = 25, n = 21).
Participants were presented with 20 pairs of semantically related words. In
a later memory test, they freely recalled the presented words. This
procedure was repeated for a total of six study and test trials. Responses
were classified into four categories: both words in a pair are recalled
adjacently (E1) or non-adjacently (E2), one word in a pair is recalled (E3),
neither word in a pair is recalled (E4).
}
\source{
The data were made available by William H. Batchelder.
}
\references{
Riefer DM, Knapp BR, Batchelder WH, Bamber D, Manifold V (2002).
Cognitive Psychometrics: Assessing Storage and Retrieval Deficits in Special Populations with Multinomial Processing Tree Models.
\emph{Psychological Assessment}, \bold{14}, 184--201.
}
\examples{
data("MemoryDeficits", package = "psychotools")
aggregate(cbind(E1, E2, E3, E4) ~ trial + group, MemoryDeficits, sum)
}
\keyword{datasets}
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