Skip to main content
. Author manuscript; available in PMC: 2013 May 1.
Published in final edited form as: Econ J (London). 2012 Apr 12;122(560):418–448. doi: 10.1111/j.1468-0297.2012.02499.x

Table 6b.

Polynomial Regression Estimates of the Education Effect on Cognitive Test Scores (Age left<19).

Age< 19 Males Females
Memory
pol. order h = 5 h = 8 h = 10 h = 5 h = 8 h = 10
k = 2 .414
(.629)		 .017
(.235)		 −.059
(.228)		 .294
(.182)		 .155
(.122)		 .159
(.108)
k = 3 .242
(.384)		 .565
(.691)		 .283
(.381)		 .270
(.189)		 .294
(.204)		 .228
(.164)
k = 4 .090
(.523)		 .326
(.494)		 .427
(.579)		 .357
(.218)		 .366 *
(.208)		 .308
(.210)
Exec. func.
k = 2 .136
(.629)		 −.036
(.238)		 .059
(.215)		 .008
(.196)		 .053
(.129)		 .109
(.114)
k = 3 .754
(.522)		 .425
(.675)		 .050
(.395)		 −.086
(.210)		 .013
(.218)		 .024
(.178)
k = 4 .457
(.586)		 .719
(.660)		 .559
(.666)		 −.132
(.239)		 −.129
(.224)		 −.088
(.231)
N 3110 4720 5692 3638 5546 6809

Notes. Tables report the 2SLS estimates of the effect of schooling on cognitive test scores using polynomial regression. Columns denote the bandwidth selection h: 5, 8 and 10 years. Inside each sample selection (as in Table 5), rows indicate the polynomial order k from 2 to 4. All regressions include: a polynomial function of month of birth (of order k) and its interaction with the reform dummy; controls for adult height and for survey year. The standard error in parenthesis are robust to heteroskedasticity and clustered at individual level. Significance levels:

(*)

p-values between 10 and 5 percent;

(**)

p-values between 5 and 1 percent;

(***)

p-values less than 1 percent.