Time-indexed effect size calculator for achievement gap analysis:
Conversion of Cohen's d (standardized group mean differences) to d' (years/months of schooling)
     
Subject :    
Grade :    
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Enter value for d and press Compute :    
       
     
Computed value of d' :   0  
     

Note 1: For the calculation and interpretation of Cohen's d, please check out Dr. Lee Becker's calculator.

Note 2: For the calculation and interpretation of Lee & Finn's d', please check out project description below. In your computed d' value output above, number in the ones place refers to year and number in the tenths place refers to month. For example, 1.2 means that the effect is worth one year and 2 months of schooling time.