Raising the Bar: Impacts and Implementation of the New Heights Program for Expectant and Parenting Teens in Washington, dc


Alternative method of weighting semesters



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New Heights Final Report

Alternative method of weighting semesters 
Our primary impact estimates are based on the difference between the post-pre difference 
for parenting females and the post-pre difference for non-parenting females. The pre-expansion 
averages weight semesters by the proportion of parents in the pre-expansion period who are 
observed in that semester, whereas the post-expansion averages weight semesters by the 
proportion of parents in the post-expansion period who are observed in that semester. To test the 
robustness of this approach, we also calculated impacts by weighting semesters equally. Under 
this approach, the impact on unexcused absences per semester and credits earned per year remain 
significant (Table C.7). The impact on days attended per semester is marginally significant, 
whereas the impacts on excused absences per semester and the semester graduation rate are not 
significant.
C.12 


APPENDIX C: ANALYTIC METHODS OF IMPACT ANALYSIS AND RESULTS FROM ALTERNATIVE MODELS
 
Table C.7. New Heights impacts under alternative weighting of semesters 
.
 
Unexcused 
absences 
per semester 
Excused 
absences per 
semester 
Days 
attended per 
semester 
Credits 
earned 
per 
semester 
Semester 
graduation 
rate
a
 
(percentage) 
Sample 
size 
Main analysis results 
-4.54*** 
1.35** 
3.43*** 
1.06*** 
0.03* 
10,760 
Weighting semesters 
equally 
-3.70*** 
1.23
2.85* 
1.03*** 
0.02
10,760 
Source: DCPS administrative date; DC DOH administrative data. 
Note: 
All regressions, unless otherwise noted, include year fixed effects, semester fixed effects, age indicators
race and ethnicity indicators, and an indicator for being over age when entering 9th grade. 
P
-values are 
based on standard errors made robust to serial correlation within students. Statistical significance is based 
on a two-tailed t-test. Statistical significance within the three outcomes in the attendance domain, 
unexcused absences, excused absences, and days attended, are based on 
p
-values that are adjusted for 
multiple comparisons using a Bonferroni adjustment 
a
The semester graduation rate is the proportion of students who graduate each semester. The analysis is restricted 
to students who are at least 17 years old each semester. The semester graduation rate is a marginal measure of 
graduation, whereas the more commonly used cohort graduation rate is a cumulative measure. The semester 
graduation rate is lower than the cohort graduation rate. 
*Significantly different from zero at the .10 level. 
**Significantly different from zero at the .05 level. 
***Significantly different from zero at the .01 level. 
C.13 



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