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The PROBIT Procedure

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Chapter 54The PROBIT ProcedureChapter Table of the Natural Response Threshold Parameter ............ ........................... ...............................2843OUTPU TStatement ..............................2846WEIGHT Statement .............................. .................................2847Res ponse Level Ordering ............................2847Computat ionalMethod ............................. ................................2851Tole rance Distribution . ............................2852InverseC onfidenceLimits ...........................2852OUTEST= Data ................................2854ODST ableNames ............................... Multilevel Response .......................2865Example Logistic Regression ....................... Chapter 54. The PROBIT ProcedureSAS OnlineDoc : Version 8Chapter 54The PROBIT ProcedureOverviewThe PROBIT Procedure calculates maximum likelihood estimates of regression pa-rameters and the natural (or threshold) response rate for quantal response data frombiological assays or other discrete event data.

Notice that PROC PROBIT, by default, models the probability of the lower response levels. The choice of the distribution function F (normal for the probit model, logistic for the logit model, and extreme value or Gompertz for the gompit model) determines the type of analysis. For most problems, there is relatively little difference between

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