Creates 100(1alpha) percent bootstrap percentile confidence intervals as an alternative to the Vasicek test.
1  vastol(segment, target, bootsamp, grp, alpha, lower)

segment 
 The score groupings. 
target 
 The binary target variable. 
bootsamp 
 How many bootstrap samples to be computed. When bootsamp is too low, a warning will be produced. 
grp 
 An integer value of how the segments are grouped. 
alpha 
 Confidence level. 
lower 
 Set equal to 1 if calculating a lower bound. 
[1] Glennon, D., â€śManaging Model Risk in Retail Scoring," Credit Risk Analysis Division Office of the Comptroller of the Currency, September 2012.
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