Table A.2.
Descriptive Statistics of Independent Variables by Double Major Status
Single MajorDouble Major
MeanSDMeanSD
Demographic and family background
Female 0.574 0.495 0.604 0.489
Age 25.16 6.990 23.12 4.293
White 0.726 0.446 0.750 0.433
Black or African American 0.0938 0.292 0.0607 0.239
Hispanic 0.0936 0.291 0.0843 0.278
Asian 0.0559 0.230 0.0642 0.245
Other race/ethnicity 0.0309 0.173 0.0403 0.197
Family income ($1,000) 72.85 64.44 84.02 70.72 First generation 0.456 0.498 0.366 0.482 Academic performance SAT score 1072.8 185.5 1144.0 198.4 Earned college credits in high school 0.434 0.496 0.516 0.500 Number of Advanced Placement credits 1.007 3.704 2.099 6.971 Normalized GPA (0—4) 3.250 0.476 3.331 0.484 Total credits earned 123.1 31.35 130.8 35.69 Institutional control and selectivity Public 0.630 0.483 0.589 0.492 Private not-for-profit 0.321 0.467 0.394 0.489 Private for-profit 0.0490 0.216 0.0165 0.127 Most competitive 0.0559 0.230 0.134 0.341 Highly competitive 0.109 0.311 0.118 0.322 Very competitive 0.239 0.427 0.286 0.452 Competitive 0.389 0.488 0.334 0.472 Less competitive 0.0753 0.264 0.0469 0.211 Noncompetitive 0.0265 0.161 0.0310 0.173 Special focus 0.0150 0.121 0.00368 0.0606 Single MajorDouble Major MeanSDMeanSD Demographic and family background Female 0.574 0.495 0.604 0.489 Age 25.16 6.990 23.12 4.293 White 0.726 0.446 0.750 0.433 Black or African American 0.0938 0.292 0.0607 0.239 Hispanic 0.0936 0.291 0.0843 0.278 Asian 0.0559 0.230 0.0642 0.245 Other race/ethnicity 0.0309 0.173 0.0403 0.197 Family income ($1,000) 72.85 64.44 84.02 70.72
First generation 0.456 0.498 0.366 0.482
SAT score 1072.8 185.5 1144.0 198.4
Earned college credits in high school 0.434 0.496 0.516 0.500
Number of Advanced Placement credits 1.007 3.704 2.099 6.971
Normalized GPA (0—4) 3.250 0.476 3.331 0.484
Total credits earned 123.1 31.35 130.8 35.69
Institutional control and selectivity
Public 0.630 0.483 0.589 0.492
Private not-for-profit 0.321 0.467 0.394 0.489
Private for-profit 0.0490 0.216 0.0165 0.127
Most competitive 0.0559 0.230 0.134 0.341
Highly competitive 0.109 0.311 0.118 0.322
Very competitive 0.239 0.427 0.286 0.452
Competitive 0.389 0.488 0.334 0.472
Less competitive 0.0753 0.264 0.0469 0.211
Noncompetitive 0.0265 0.161 0.0310 0.173
Special focus 0.0150 0.121 0.00368 0.0606

Notes: Based on unimputed data. Panel and transcript weights are applied, and variance are estimated by Taylor linearized method. “Age” is measured in 2008. “Family income” is family income (dependents’ parents or independents) in 2006. “First generation” is defined as neither of parents has a bachelor's degree and beyond. Institutional selectivity index is from Barron's College Competitiveness Index 2008. Financial variables are adjusted to 2012 dollars using the Consumer Price Index. SD = standard deviation; GPA = grade point average.

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