A method of computing percentile ranks from the logistic distribution function is described. The method was applied to three distributions of number-right scores from the Law School Admission Test, and compared to percentile ranks computed using linear interpolation. (Author/JKS)

The purpose of this study was to determine conditions under which young children enumerate by counting in multiples. Contrasting effects of different numerosities and perceptual arrangements are discussed in terms of contextual support for the use and development of numerical skills among young children. (Author/RWB)

The difference between estimation (the mental skill of making an educated guess) and approximation (finding a result precise enough for a specific purpose) is discussed. (MNS)

A multiple baseline design was used to demonstrate the effectiveness of a self-instruction training sequence across three groups of three preschool handicapped students to improve their ability to count a requested number of objects from one to ten. Eight of nine students showed improved accuracy in counting objects and generalized these gains to…

A math teacher recounts how six weeks of computer assisted instruction, about which she had been very skeptical at first, resulted in substantial gains for six learning disabled students in addition, subtraction, multiplication, and division. (CL)

Researchers in education and the social sciences make extensive use of linear regression models in which the dependent variable is continuous-valued while the explanatory variables are a combination of continuous-valued regressors and dummy variables. The dummies partition the sample into groups, some of which may contain only a few observations.…

This arithmetic textbook aims to teach the reading of figures so as to train the mind to instantly catch the idea that any combination of figures is intended to express. This is to be done by "the simple process of reading;" and the method consists: (1) in teaching the alphabet; and (2) in teaching the combinations of the alphabet, which…

Arithmetic is the science of numbers, and also the art of computation. This textbook presents mental and written arithmetic through simple numbers. [This book was written by the Brothers of the Christian Schools and published by De La Salle Institute.]

A computational short cut suggested by Feldman and Klinger for the one-sided Fisher-Yates exact test is clarified and is extended to the calculation of probability values for certain two-sided tests when sample sizes are unequal. (Author)

Examines the undercount problem in the 1990 census, the ways in which the Census Bureau has dealt with it in the past, and the Bureau's plans to avoid future undercounts. It also discusses the statistical concept of dual systems estimation in census counting as a means of lessening an undercount. (GR)

Studied accuracy and use of sequence number string in hearing 3- to 5-year-olds and in deaf 4- to 6-year-olds using the Belgian French Sign Language. Found that deaf children exhibited age-related lags in knowledge of the number sequence, and made different errors from those of hearing children, reflecting the rule-bound nature of sign language.…

Two experiments explored effects of intervention and test conditions on preschoolers' use of counting to compare two sets. At mean age of 4 years 4 months, children in two intervention groups were more likely to use counting to compare sets than those in control group. Use of counting to compare sets was closely related to counting performance.…