Summary of samples from data sets HSB NElS Number of individuals 2477 14.988 6255 Type of data Cross-section Panel Panel Time period 1980,1982 1988,1990,1992 Age of respondents 16-19 13-22 12-20 Sibling structure 239 sibling pairs 432 twin pairs None Test score AFQT Vocabulary, reading, math Reading, math TV variable Hours per week Hours per weekday Hours per weekday, weekend y Categorical or linear L Categorical (7) Categorical (6 or 7) Ka-fu Wong C2007 ECON1003: Analysis of Economic Data Lesson 11-4Ka-fu Wong © 2007 ECON1003: Analysis of Economic Data Lesson11-4 Summary of samples from data sets