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    Code:
    Probit model for atrisk_only
    -------- True --------
    Classified | D ~D | Total
    -----------+--------------------------+-----------
    + | 1 1 | 2
    - | 245 2474 | 2719
    -----------+--------------------------+-----------
    Total | 246 2475 | 2721
    
    Classified + if predicted Pr(D) >= .5
    True D defined as atrisk_only != 0
    --------------------------------------------------
    Sensitivity Pr( +| D) 0.41%
    Specificity Pr( -|~D) 99.96%
    Positive predictive value Pr( D| +) 50.00%
    Negative predictive value Pr(~D| -) 90.99%
    --------------------------------------------------
    False + rate for true ~D Pr( +|~D) 0.04%
    False - rate for true D Pr( -| D) 99.59%
    False + rate for classified + Pr(~D| +) 50.00%
    False - rate for classified - Pr( D| -) 9.01%
    --------------------------------------------------
    Correctly classified 90.96
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