This study aims at determining the extent to which computer using skills specified in Project for International Students Evaluation (PISA) 2006 predict Turkish students' achievement in mathematics. Apart from questions on mathematics, science and reading competencies, a student questionnaire, a school questionnaire and a parent questionnaire were…

Among the computer-based methods used for the construction of trees such as AID, THAID, CART, and FACT, the only one that uses an algorithm that first grows a tree and then prunes the tree is CART. The pruning component of CART is analogous in spirit to the backward elimination approach in regression analysis. This idea provides a tool in…

The purpose of the present research was to determine how experimental manipulations of certainty would affect social comparison choices in the paradigm used by Wheeler et al. (1969) and Gruder (1971). (Author)

Accurate classification in discriminant analysis and the value of prediction are discussed, with emphasis on the uses and key aspects of prediction. A brief history of discriminant analysis is provided. C. J. Huberty's discussion of four aspects of discriminant analysis (separation, discrimination, estimation, and classification) is cited.…

Statistical fit of model predictions to empirical evidence is found to be an insufficient condition for establishing the validity of a planning model where the dynamic behavior is of particular importance. Describes a spectral analysis statistical test that can be used to validate the structure of a planning model by comparing the time series…

A study in St. Louis shows that large urban areas can have significant local and downwind effects. (Editor)

The controversy regarding the admissibility of one-tailed tests of hypotheses was examined. Rather than taking a stand with regard to whether the one-or the two-tailed test is the most seriously flawed, a procedure is developed which can capitalize on the advantages of each. (RC)

Based on a PhD dissertation (Humphries) submitted to the Louisiana State University.

THE OBJECTIVES OF THIS STUDY WERE (1) TO DEVELOP A GENERAL CLASSIFICATION SYSTEM FOR LIFE HISTORY ITEMS, (2) TO DETERMINE TEST-RETEST RELIABILITY ESTIMATES, AND (3) TO ESTIMATE RESISTANCE TO EXAMINEE FAKING, FOR REPRESENTATIVE BIOGRAPHICAL QUESTIONNAIRES. TWO 100-ITEM QUESTIONNAIRES WERE CONSTRUCTED THROUGH RANDOM ASSIGNMENT BY CONTENT AREA OF 200…

INS, the Integrated Network Simulation language, puts simulation modeling into a network framework and automatically performs such programming activities as placing the problem into a next event structure, coding events, collecting statistics, monitoring status, and formatting reports. To do this, INS provides a set of symbols (nodes and branches)…

This study was to identify variables potentially useful in predicting a larger proportion of variance in community college study fields than accounted for by the current Washington Pre-College (WPC) battery. Selected tests from the Comparative Guidance and Placement (CGP) Core and Research Batteries, and the Tool and Form Matching subtests from…

The Washington Pre-College (WPC) program decided, in fall 1967, to inaugurate in April 1968 the testing of high school students during the spring of their junior year. The advantages of this shift from senior year testing were to provide guidance data for earlier, more extensive use in high school and to make these data available to colleges at…

For most tests administered with time limits some examinees complete all items while others do not. It is often useful to know what the distribution of items completed would be if the number of items on the test were much larger. It may also be of interest to estimate the correlation between working speed, as measured by the number of items…

The purpose of this study was to determine if there were any systematic differences in intellective factors between graduates and non-graduates in the associate degree programs that may be useful for improving the selection process. Ten predictor and eight criterion variables were measured for all associate degree freshman classes at the college…

Phase I of Northern California Cooperative Research Project on Student Withdrawals (NORCAL) examined withdrawal and continuing students in 23 colleges, evaluated the data, predicted potential withdrawals, and summarized findings. A questionnaire was used to help develop a model to predict attrition within the first term of enrollment. The junior…