Basic Analysis and Graphing - SAS

224 Performing Simple Logistic Regression Chapter 7
Logistic Platform Options
Table 7.2 Description of the Parameter Estimates Report (Continued)
Chi-Square
Prob>ChiSq
Lists the Wald tests for the hypotheses that each of the parameters is zero. The Wald
Chi-square is computed as (Estimate/Std Error) 2 .
Lists the observed significance probabilities for the Chi-square tests.
Covariance of Estimates
Reports the estimated variances of the parameter estimates, and the estimated covariances between the
parameter estimates. The square root of the variance estimates is the same as those given in the Std Error
section.
Logistic Platform Options
The following table describes the options within the Logistic Fit red triangle menu.
Odds Ratios
Inverse Prediction
Logistic Plot
Plot Options
Adds odds ratios to the Parameter Estimates report. For more details,
see the Modeling and Multivariate Methods book.
This option is available only for a response with two levels.
Prediction of x values from given y values. For more information, see
“Inverse Prediction” on page 226.
This option is available only for a response with two levels.
Shows or hides the logistic plot.
The Plot Options menu includes the following options:
Show Points
Toggles the points on or off.
Show Rate Curve Is useful only if you have several points for
each x-value. In these cases, you get reasonable estimates of the
rate at each value, and compare this rate with the fitted logistic
curve. To prevent too many degenerate points, usually at zero or
one, JMP only shows the rate value if there are at least three
points at the x-value.
Line Color
Enables you to pick the color of the plot curves.
ROC Curve
A Receiver Operating Characteristic curve is a plot of sensitivity by
(1 – specificity) for each value of x. See “ROC Curves” on page 225.