Barriers to the use of program theory

There are numerous advantages to conducting an evaluation that is based on a strong program theory. However, a careful examination of the field of evaluation indicates that few evaluations are theory based. It is suggested that this discrepancy is caused by significant barriers such as cost, knowledge, motivation, and role confusion. Suggestions for increasing the use of program theory include improving our education and training of evaluators, changing journal policies, and augmenting our methodology for theory development.     

CRITICAL VALUE APPROXIMATIONS FOR TESTS OF LINEAR REGRESSION DISTURBANCES

Two important classes of tests for non-spherical disturbances in the linear regression model involve test statistics whose null distributions and hence critical values depend on the regressors. This paper investigates the accuracy of the normal, two moment beta and four moment beta approximations to the critical values of such tests. An empirical experiment aimed at evaluating the accuracy of the approximations for a variety of tests against autocorrelation and heteroscedasticity is conducted. Overall the approximations are found to provide reasonably accurate critical values with skewness being a factor determining the degree of accuracy.     

An exploratory study of recreational drug use and nutrition-related behaviors and attitudes among adolescents.

This study examined drug use and eating behaviors among adolescents. The data were collected by phone interviews from 401 northern Nevadan students in grades seven to twelve. Students were divided for comparison into three groups according to their involvement with drugs: Abstainers, conventional users, and high-risk users. Analyses indicated that high-risk users less frequently ate lunch, meals at home, and with their families, and ate more often at convenience stores, fast food restaurants, and with friends. In addition, female high-risk users had significantly more negative perceptions regarding their food choices than the other female groups, and were more concerned with dieting than their high-risk using male peers. Male and female high-risk users believed that their drug use affected their eating habits. Implications for prevention programming and future research are discussed.     

Consequences of Population Change for Retail/Wholesale Sector Employment in the Nonmetropolitan Great Plains: 1950–19961

Abstract A rural economic restructuring perspective and central place theory are used to assess the impact of population change on retail/wholesale sector employment for the 438 nonmetropolitan counties of the Great Plains region from 1950 to 1990. Findings indicate that county level population declined for every decade except the 1970 turnaround decade, and the greatest losses were in completely rural nonadjacent counties. The civilian labor force declined for all but the 1970 decade, when there was a substantial increase due to increased nonmetro manufacturing and the baby boom cohorts reaching labor force age. Retail/wholesale labor force increased in every decade except the 1980s. However, regression analysis found a positive and highly significant relationship between population change and retail/wholesale employment change. For this region, population decline is a major contributor to decline in the retail/wholesale employment sector at the county level. Preliminary data from the 1990–1996 period indicate a population and labor force rebound from the 1980s. However, as in the 1980s, gains are most likely concentrated in a small number of mainly urban nonadjacent counties.