Table:
1999
2012

marginal effect
bootstrap standard error
marginal effect
bootstrap standard error

no covariates
16,010
2,866
34,486
4,885

add net worth
6,982
2,608
13,068
3,362

add parental education
2,729
2,527
7,626
3,369

add parental age
2,996
2,566
7,520
3,386

add parental marital status
2,534
2,535
6,366
8,182

add number of children
2,995
2,608
8,182
3,481

add age of youngest child
3,520
2,531
7,859
3,491

add age of oldest child
3,921
2,466
8,080
3,553

add region
3,006
2,456
7,784
3,664

add urban/rural status
2,941
2,443
7,691
3,654

no covariates
16,010
2,866
34,486
4,885

add parental education
9,469
2,429
24,943
3,947

add net worth
2,729
2,527
7,626
3,369

Statement: adding parental education to the model implies a 26.6% contribution in 1999.
Question: what proportion did adding parental education contribute to the overall gap in the dollar value of resps in 1999?
Answer: [0.265646]