Probit example

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Probit example
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• Probit -0.70946 0.11582 (months)
• Example Predicted success of juveniles with 8
  months supervision
•  
• Total 36, 22 succeeded or 61.1
•  
• Probit -0.70946 0.11582 ( 8 months)
•  
• Probit 0.2171
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• Z of 0.2171 has an associated area under
• the larger portion of the curve of 0.5859
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• (36 juveniles) (0.5859) 21.09 successes
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• Residual (22 - 21.09) 0.91

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• 22 out of 36 juveniles succeeded with 8 months of
  supervision (61.1). The Probit equation yields a
  Z 0.2171. Since Z is positive, the area in the
  larger portion of the curve is 0.5859, or a
  prediction of a 58.59 success rate.

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Standard Normal Distribution
Area 0.5859
Z 0.00
Z 0.2171