Probit Analysis - Options
main topic     how to     see also 

Stat > Reliability/Survival > Probit Analysis > Options

You can choose to estimate model parameters and the natural response rate from the data or enter values, define the event and reference factor level, and change the number of groups for the Hosmer-Lemeshow Test.

Dialog box items

Estimate model parameters: Choose to estimate the model parameters from the data (the default).

Use starting estimates: Enter a column that contains starting values for model parameters. The column should include one starting value for each coefficient in the regression table. Values should be listed in the order that they appear in the regression table.

Maximum number of iterations: Enter a number to change the maximum number of iterations for reaching convergence (the default is 20). Minitab obtains maximum likelihood estimates through an iterative process. If the maximum number of iterations is reached before convergence, the command terminates.

Use historical estimates: Enter a column that contains historical estimates for the model parameters. The column should include one value for each coefficient in the regression table. Values should be listed in the order that they appear in the regression table.

Natural response rate

Estimate from data: Check to estimate the natural response rate.

Set value: Enter a value for the estimate of the natural response rate. If Estimate from data is checked, this value will be used as a starting value for the algorithm for estimating the natural response rate. If Estimate from data is unchecked, this value will be used as the natural response rate.

Reference Options

Event: If you have response/frequency data, you can enter a value to define the occurrence of an event. If you do not enter a value, the highest value in the column is used.

Reference factor level: Enter a reference level for the factor. Otherwise, the lowest value in the column is used.

Option for Hosmer-Lemeshow Test: To see the results of this test, you must choose the option to display all results in the Probit Analysis - Results dialog box.

Number of groups: Enter the number of groups for the Hosmer-Lemeshow goodness-of-fit test. By default, this test bins the data into 10 groups.