Descriptor
Author
| Baldwin, Beatrice | 1 |
| Barcikowski, Robert | 1 |
| Cooper, Michael D. | 1 |
| Fan, L. T. | 1 |
| Fox, R. O. | 1 |
| Gordon, Michael | 1 |
| Kochen, Manfred | 1 |
| Robey, Randall R. | 1 |
| Sandler, Stanley I. | 1 |
| Waller, Michael I. | 1 |
Publication Type
| Reports - Research | 5 |
| Journal Articles | 4 |
| Speeches/Meeting Papers | 3 |
| Reports - Descriptive | 1 |
| Reports - Evaluative | 1 |
Education Level
Audience
| Researchers | 7 |
Location
| United States | 1 |
Laws, Policies, & Programs
Assessments and Surveys
What Works Clearinghouse Rating
Peer reviewedGordon, Michael; Kochen, Manfred – Journal of the American Society for Information Science, 1989
Describes the recall precision trade-off in information retrieval as the deceleration in the proportion of relevant documents retrieved over time. Several mathematical functions sharing this property are examined and it is concluded that the equation that best models recall as a function of time is the logarithm of a quadratic equation. (21…
Descriptors: Equations (Mathematics), Functions (Mathematics), Logarithms, Mathematical Models
Download full textBarcikowski, Robert; Robey, Randall R. – 1990
Use of "special" orthonormal mean contrasts and mean contrast variances can help educational researchers interpret a wide variety of repeated measures data. Most statistical packages allow educational researchers to test for differences across repeated measures using both the univariate mixed model F test and a multivariate test.…
Descriptors: Computer Software, Data Interpretation, Educational Research, Equations (Mathematics)
Peer reviewedFox, R. O.; Fan, L. T. – Chemical Engineering Education, 1990
Discusses the master equation of a stochastic model in chemical process systems. Presents a solution technique known as the System Size Expansion. (YP)
Descriptors: Chemical Engineering, Chemical Reactions, Engineering, Equations (Mathematics)
Peer reviewedSandler, Stanley I. – Chemical Engineering Education, 1990
Establishes a theoretical basis for both understanding and testing the molecular level assumptions in mixtures. Considers activity coefficient models and equation of state mixing rules. (YP)
Descriptors: Chemical Engineering, Computer Simulation, Engineering, Equations (Mathematics)
Baldwin, Beatrice – 1986
LISREL-type structural equation modeling is a powerful statistical technique that seems appropriate for social science variables which are complex and difficult to measure. The literature on the specification, estimation, and testing of such models is voluminous. The greatest proportion of this literature, however, focuses on the technical aspects…
Descriptors: Analysis of Covariance, Computer Software, Equations (Mathematics), Error of Measurement
Peer reviewedCooper, Michael D. – Library Quarterly, 1984
Research analyzing demand for librarians in public, school, academic, special libraries, and in nonlibrary information professions, indicates that from 1983 to 1990, there will be almost no additional positions in traditional areas. Replacement of librarians will generate 9,500 to 10,000 new jobs per year. Footnotes and 114 references are…
Descriptors: Employment Opportunities, Employment Patterns, Employment Projections, Enrollment Projections
Waller, Michael I. – 1986
This study compares the fit of the 3-parameter model to the Ability Removing Random Guessing (ARRG) model on data from a wide range of tests of cognitive ability in three representative samples. When the guessing parameters under the 3-parameter model are estimated individually for each item, the 3-parameter model yields the better fit to…
Descriptors: Cognitive Tests, Cohort Analysis, Elementary Secondary Education, Equations (Mathematics)
