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. Author manuscript; available in PMC: 2016 Apr 11.
Published in final edited form as: Educ Eval Policy Anal. 2015 Jul 6;38(1):88–112. doi: 10.3102/0162373715587965

Figure 2.

Figure 2

Figure 2

Histograms of the assignment variable and selected covariates within a 90-day bandwidth of the treatment cutoff

A) Y-axis indicates the percent of children within a birthdate range around the treatment cutoff in the study sample. This figure shows that the distributions of children’s ages are similar on both sides of the cutoff (i.e., no clustering at the cutoff). Children in cohort 1 are shown on the right-hand side of the figure (treatment), and children in cohort 2 are shown on the left-hand side (comparison).

B-D) Y-axes indicates the percent of children within a birthdate range around the treatment cutoff with the identified characteristic (Hispanic, reduced-price lunch eligible and High School degree or higher, respectively) near the cutoff. These figures illustrate that the distributions of children’s observable characteristics are similar on both sides of the cutoff. Children in cohort 1 are shown on the right-hand side of the figures (treatment), and children in cohort 2 are shown on the left-hand side (comparison).