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Lazarus, Carrie; Autry, Andy; Baio, Jon; Avchen, Rachel Nonkin; Braun, Kim Van Nardeen – American Journal on Mental Retardation, 2007
Prevalence estimates often use U.S. Census Bureau estimates of the population as denominator data. Postcensal estimates are population estimates produced following a decennial census. Intercensal estimates are surrounded by 2 census years and supersede postcensal estimates. In this report we describe prevalence estimates in Atlanta for mental…
Descriptors: Incidence, Mental Retardation, Developmental Disabilities, Cerebral Palsy
Baroody, Arthur J. – American Journal on Mental Retardation, 1996
An experimental group (n=13) and a control group (n=15) of children with mental retardation were both shown a basic concrete counting procedure. Over six months, the experimental group was given regular opportunities to practice computing sums. Many of them invented calculational short cuts. Results suggest that children with mental retardation…
Descriptors: Addition, Children, Cognitive Processes, Computation
Young, R. L.; Nettelbeck, T. – American Journal on Mental Retardation, 1994
The strategies of four men with mild mental retardation when performing calendar calculations were investigated. Results suggested that subjects were aware of calendar rules and regularities, including knowledge of the 14 different calendar templates. Their strategies were rigidly applied and relied heavily on memory, with little manipulation of…
Descriptors: Adults, Case Studies, Cognitive Processes, Computation
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Bruckner, Cornelia Taylor; Yoder, Paul – American Journal on Mental Retardation, 2006
Kappa (Cohen, 1960) is a popular agreement statistic used to estimate the accuracy of observers. The response of kappa to differing baserates was examined and methods for estimating the accuracy of observers presented. Results suggest that setting a single value of kappa as "minimally acceptable" (i.e., a criterion value) is not useful in ensuring…
Descriptors: Computation, Observation, Guidelines, Evaluation Methods
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Kroeker, Rose; Touchette, Paul E.; Engleman, Laszlo; Sandman, Curt A. – American Journal on Mental Retardation, 2004
An objective method is presented to group discrete self-injurious behavior (SIB) events into bouts. Survival analysis was used to determine how long after an SIB the probability of observing a subsequent SIB remained elevated. This estimated bout length criterion time point was determined individually for 19 subjects with developmental disorders…
Descriptors: Probability, Developmental Disabilities, Self Destructive Behavior, Evaluation Criteria
Spitz, Herman H. – American Journal on Mental Retardation, 1993
This paper presents Lewis Carroll's formula for mentally calculating the day of the week of a given date. The paper concludes that such formulas are too complex for individuals of low intelligence to learn by themselves, and thus "idiots savants" who perform such calendar calculations must be using other systems. (JDD)
Descriptors: Cognitive Processes, Computation, Exceptional Persons, Mathematical Formulas
Caycho, L.; And Others – American Journal on Mental Retardation, 1991
The study compared the understanding of one-to-one, stable order, and cardinal principles of 15 children with Down syndrome and 15 preschoolers with similar language skills. No significant differences were found suggesting that developmental level rather than syndrome is associated with counting behavior. (Author/DB)
Descriptors: Computation, Concept Formation, Developmental Stages, Downs Syndrome