This problem uses the Northridge earthquake data set. Perform a factor analysis on the following items in the Brief Symptom Inventory (BSI): V346, V357, V364, V383, V390, V394, V351, V358, V385, V386, V391. Note that the first six items relate to the anxiety subscale of BSI and the next five items relate to the hostility subscale of the BSI. Use (at least) these three methods:

(a) principal components,

(b) iterated principal components and

(c) maximum likelihood.

Spend a good amount of time interpreting your results. Do the substantive conclusions differ by method? In this analysis, delete missing data and recode all responses = 5 to be = 4

(this recoding makes possible response values 0, 1, 2, 3 or 4 rather than 0, 1, 2, 3 or 5).