Degree Discipline
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Robustness of Parametric and Nonparametric Tests When Distances between Points Change on an Ordinal Measurement Scale
The purpose of this research was to evaluate the effect on parametric and nonparametric tests using ordinal data when the distances between points changed on the measurement scale. The research examined the performance of Type I and Type II error rates using selected parametric and nonparametric tests.
Date:
August 1994
Creator:
Chen, Andrew H. (Andrew Hwa-Fen)
System:
The UNT Digital Library
Comparing the Powers of Several Proposed Tests for Testing the Equality of the Means of Two Populations When Some Data Are Missing
In comparing the means .of two normally distributed populations with unknown variance, two tests very often used are: the two independent sample and the paired sample t tests. There is a possible gain in the power of the significance test by using the paired sample design instead of the two independent samples design.
Date:
May 1994
Creator:
Dunu, Emeka Samuel
System:
The UNT Digital Library
The Effect of Certain Modifications to Mathematical Programming Models for the Two-Group Classification Problem
This research examines certain modifications of the mathematical programming models to improve their classificatory performance. These modifications involve the inclusion of second-order terms and secondary goals in mathematical programming models. A Monte Carlo simulation study is conducted to investigate the performance of two standard parametric models and various mathematical programming models, including the MSD (minimize sum of deviations) model, the MIP (mixed integer programming) model and the hybrid linear programming model.
Date:
May 1994
Creator:
Wanarat, Pradit
System:
The UNT Digital Library