This paper investigates response problems encountered in a panel study of travel behavior. Though the overall response rate to the three-wave panel study was acceptable (over 60%), three types of response problems were encountered: refusal, non-response, and attrition. In a follow-up phone survey, a sample of individuals from each problem response group was questioned about their study particip...

The artificial language Esperanto is spoken not only as a second language, by its proponents, but also as a native language by children of some of those proponents. The present study is a preliminary description of some characteristics of the Native Esperanto (NE) of eight speakers, ranging in age from six to fourteen years. As such, it is the first of its kind – previous works on NE are either...

BACKGROUND/AIMS External pilot trials are recommended for testing the feasibility of main or confirmatory trials. However, there is little evidence that progress in external pilot trials actually predicts randomisation and attrition rates in the main trial. To assess the use of external pilot trials in trial design, we compared randomisation and attrition rates in publicly funded randomised con...

This paper analyzes data on 11,600 students and their teachers who were randomly assigned to different size classes from kindergarten through third grade. Statistical methods are used to adjust for nonrandom attrition and transitions between classes. The main conclusions are (1) on average, performance on standardized tests increases by four percentile points the Žrst year students attend small...

We are grateful to the New York City Department of Education and the New York State Education Department for the data employed in this paper. The research is supported by funding from the Carnegie Corporation of New York, the National Science Foundation, the U.S. Department of Education and the Spencer Foundation. The views expressed in the paper are solely those of the authors and may not refl...

BACKGROUND eHealth interventions can reach large populations and are effective in increasing physical activity (PA) and fruit and vegetable intake. Nevertheless, the effects of eHealth interventions are overshadowed by high attrition rates. Examining more closely when users decide to leave the intervention can help eHealth developers to make informed decisions about which intervention component...

Many companies survey employees about their managers yet it is unclear whether this information is, or should be used to evaluate and compensate managers. Data from a high-tech firm reveals that survey measures are associated with employees’ lower attrition, higher promotions, higher salary increases, and higher engagement, but have only a limited relation to subjective performance scores. The ...