Download the NCS-R data set from the book Web site and consider the following questions. For this exercise, the SESTRAT variable identifies the stratum codes for computation of sampling errors, the SECLUSTR variable identifies the sampling error computation units, and the NCSRWTSH variable contains the final sampling weights for Part 1 of the survey for each sampled individual.
a. How many sampling error calculation strata are specified for the NCS-R sampling error calculation model?
b. How many SECUs (or clusters) are there in total?
c. How many degrees of freedom for variance estimation does the NCS-R provide?
d. What is the expected loss, Lw, due to random weighting in survey estimation for total population estimates? Hint: Lw = CV2(weight); see Section 2.7.5.
e. What is the average cluster size, b, for total sample analyses of variables with no item-missing data?