Table:
pooled cohorts
by single birth year
by cohort, 3-year groups
residualized on age
number

mean
sd
mean
sd
mean
sd
mean
sd

1963 to 1974 birth cohorts

employment income

child individual income
40.99
0.19
40.58
0.19
40.60
0.19
40.46
0.20
2,272.00

child and spouse income, unadjusted
39.85
0.21
39.20
0.21
39.31
0.22
39.37
0.22
..

total income

child individual income
38.62
0.23
38.59
0.23
38.55
0.23
38.07
0.25
2,473.00

child and spouse income, unadjusted
36.75
0.27
36.54
0.27
36.54
0.27
36.38
0.28
..

1963 to 1979 birth cohorts

employment income

child individual income
41.23
0.18
40.45
0.19
40.69
0.19
40.71
0.19
2,995.00

child and spouse income, unadjusted
39.25
0.22
37.98
0.23
38.41
0.23
38.63
0.23
..

total income

child individual income
39.73
0.21
39.38
0.21
39.44
0.21
39.07
0.23
3,244.00

child and spouse income, unadjusted
37.33
0.26
36.63
0.26
36.80
0.27
36.74
0.27
..

1963 to 1984 birth cohorts

employment income

child individual income
42.46
0.16
40.85
0.18
41.11
0.18
40.90
0.19
3,753.00

child and spouse income, unadjusted
40.82
0.19
38.48
0.22
38.96
0.22
38.98
0.23
..

total income

child individual income
40.74
0.19
39.53
0.21
39.70
0.21
39.27
0.22
4,043.00

child and spouse income, unadjusted
39.01
0.23
37.29
0.25
37.60
0.25
37.44
0.26
..

Statement: samples pooling the 1963-1984 cohorts almost double the sample size compared to one restricted to the 1963-1974 cohorts, from 2473 to 4043 observations when using total income.
Question: how many times the sample size of the 1963-1984 cohorts is that of the 1963-1974 cohorts when using total income?
Answer: [1.634856]