Linda Cherrington

Subject pool effects among the general population and students: a choice experiment example

ABSTRACT Rising costs of conducting research coupled with limited budgets are forcing researchers to use samples of convenience. Students represent one such sample, but are students an appropriate population? The objective is to ascertain how students’ willingness to pay (WTP) differs from the general public’s WTP. Students and county residents are surveyed. Results suggest the study’s goal may determine if student responses are generalizable to the general population. The samples are similar in many characteristics, but WTP amounts vary. The student samples show some inconsistencies. If the goal is general behavioural inferences, the results provide support for the use of students. If the goal is to estimate specific WTPs for use in policy analysis, the use of students may not be advisable.

The Case of Performance Measurement in Mobility Management Programs

The concept of mobility management has gained popularity over the last few decades. It refers to the provision of accessible, affordable, and multimodal transportation for all, including those who cannot or do not drive due to age, disability, or lower income. Mobility management programs can be found in large cities, urban areas, and rural areas. Evaluation of these programs is difficult in the absence of national guidelines. Consequently, many programs have developed their own measures, while others lag in performance measurement. This case study investigates the performance measures used to evaluate some established mobility management programs. Based on analysis of the performance measures, recommendations are made for their adoption by new programs or incorporation into existing ones.