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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 
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 

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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