PROBIT

PROBIT is available in SPSS® Statistics Standard Edition or the Regression Option.

PROBIT can be used to estimate the effects of one or more independent variables on a dichotomous dependent variable (such as dead or alive, employed or unemployed, product purchased or not). The program is designed for dose-response analyses and related models, but PROBIT can also estimate logistic regression models.

PROBIT response-count varname OF observation-count varname
        WITH varlist [BY varname(min,max)]

 [/MODEL={PROBIT**}]
         {LOGIT   } 
         {BOTH    } 

 [/LOG=[{10** }]
        {2.718}
        {value}
        {NONE }

 [/CRITERIA=[{OPTOL   }({epsilon**0.8})][P({0.15**})][STEPLIMIT({0.1**})]
             {CONVERGE} {n           }     {p     }             {n    }

            [ITERATE({max(50,3(p+1)**})]]
                     {n              }

 [/NATRES[=value]]

 [/PRINT={[CI**] [FREQ**] [RMP**]} [PARALL] [NONE] [ALL]] 
         {DEFAULT**              }

 [/MISSING=[{EXCLUDE**}]  ] 
            {INCLUDE  }   

**Default if the subcommand or keyword is omitted.

This command reads the active dataset and causes execution of any pending commands. See the topic Command Order for more information.

Syntax for the PROBIT command can be generated from the Probit Analysis dialog.

Example

PROBIT  R OF N BY ROOT(1,2) WITH X
  /MODEL = BOTH.