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Summary statistics from the 1970 Census are shown in table 1 for the pooled sample of white and black men. There is a large difference in WWII military participation rate for cohorts born before and after 1928. The fraction of men who participated in WWII from the birth cohort 1923–1927 is high (0.74) whereas for the birth cohort 1928–1932 it is much lower (0.1). The opposite trend holds true for participation in the Korean War, with the latter birth cohorts having much higher participation rates. The fraction of men completing high school is slightly higher for the latter cohorts, whereas the fraction of men living below the poverty line and employed is similar for the birth cohorts 1923–1927 and 1928–1932. The number of weeks worked is also similar across the two cohorts. Figure 1 shows the graphical representation of the trend for WWII military participation and high school completion by birth cohort (year by quarter). As the solid curve depicts, national WWII military participation across different birth cohorts ranges from 0 to 0.8 and drops sharply at the birth cohort 1928. The dashed line shows that there is an upward trend in high school completion over time. Empirical analysis thus requires the inclusion of a time trend, as is specified in equation 1.
Table 1. 
Summary Statistics for Men of Birth Cohorts 1923—1927 and 1928—1932
1923—19271928—1932
In World War II 0.742 0.102 
In Korean War 0.053 0.559 
College graduate 0.163 0.181 
Completed high school 0.571 0.639 
Below poverty line 0.058 0.064 
Employed 0.964 0.971 
Weeks worked 47.04 47.5 
No. of observations 148,337 140,473 
1923—19271928—1932
In World War II 0.742 0.102 
In Korean War 0.053 0.559 
College graduate 0.163 0.181 
Completed high school 0.571 0.639 
Below poverty line 0.058 0.064 
Employed 0.964 0.971 
Weeks worked 47.04 47.5 
No. of observations 148,337 140,473 

Notes: The statistics for all the variables, except number of weeks worked, are reported as fractions because this is how the corresponding variables are measured in the regressions.

Source: 1970 Integrated Public Use Microdata Series (see Ruggles et al. 2010).

Figure 1.

Graphical Representation of WWII Participation Rate and High School Completion Rate for the Combined Sample of Black and White Men.

Figure 1.

Graphical Representation of WWII Participation Rate and High School Completion Rate for the Combined Sample of Black and White Men.

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