Propensity score methods account for selection bias in observational studies. However, the consistency of the propensity score estimators strongly depends on a correct specification of the propensity score model. Logistic regression and, with increasing popularity, machine learning tools are used to estimate propensity scores. We introduce a…

The paper shows how to find the min and max extreme interval values for the exponential and triangular distributions from the min and max uniform extreme interval values. Tables are provided to show the min and max extreme interval values for the uniform, exponential, and triangular distributions for different probabilities and observation sizes.

Examined the judgement of rectangular areas in young children who are blind from birth. Subjects were eight children ranging from six to eight years old. Their gestural strategies were examined in detail when placed in an area evaluation situation. Results indicated that acquisition of information concerning figures appeared to follow a fairly…

Investigates gender differences in smoking behavior by observing 292 men and 648 women smoking in a university workplace. Finds that men take longer breaks, smoke more cigarettes, and inhale more often than women. (MW)

This study examined the generalizability of systematic direct observation across setting and time. Participants included 14 students from an intact inclusionary fifth grade classroom. On-task/off-task behavior was directly observed using momentary time-sampling recording, twice a day, for 10 school days. Using Generalizability (G) theory, results…

Describes a study, conducted at the University of Michigan, that used two different computer-assisted instruction approaches--a linear, tutor program and a simulated library reference situation--with library school students to test learning effectiveness. Report includes 21 data tables, an interview schedule, and sample instructional materials…

This study presents a continuing investigation of influences on outcomes achieved by students working in groups of three on tasks related to chance and data. Earlier research described final mathematical outcomes and identified 17 factors influencing three types of short-term outcomes for groups working in an "isolated setting." The current report…