13.3. A regression analysis for the 100th Congress predicted the proportion of each representative's votes on abortion issues thattook the "pro-choice"

position (R. Tatalovich and D. Schier, American Politics Quarterly, vol. 21, 1993). The prediction equation was y = 0.350 + Omiid + 0.094/- + O.OOSmv

+ O.OOSmc + 0.063s - 0.167p, where/- = religion (1 for non-Catholics),s = sex(l for women),// = political party (1 for Democrats), id = idcologyisthcmcmbcr's ADA score (ranging from 0 at most conservative to 100 at most liberal), nw - nonwhite is the percentage nonwhite of the member's district, and inc = income is the median family income of the member's district.