Statistical procedures use ODS Graphics to create graphs as part of their output. ODS Graphics is described in detail in Chapter 24, Statistical Graphics Using ODS.
Before you create graphs, ODS Graphics must be enabled (for example, by specifying the ODS GRAPHICS ON statement). For more information about enabling and disabling ODS Graphics, see the section Enabling and Disabling ODS Graphics in Chapter 24, Statistical Graphics Using ODS.
The overall appearance of graphs is controlled by ODS styles. Styles and other aspects of using ODS Graphics are discussed in the section A Primer on ODS Statistical Graphics in Chapter 24, Statistical Graphics Using ODS.
PROC NLIN assigns a name to each graph it creates using ODS. You can use these names to refer to the graphs when using ODS. The graphs that are controlled by the PLOTS option in the PROC NLIN statement are listed in Table 10, those that are controlled by the options in PROFILE statement are in Table 11.
Table 10: Graphs Controlled by the PLOTS option in the PROC NLIN Statement
| ODS Graph Name | Plot Description | PLOTS Option |
|---|---|---|
| ContourFitPlot | Contour fit plot for models with two regressors | FIT |
| FitPlot | Fit plot for models with one regressor | FIT |
| FitDiagnosticsPanel | Panel of fit diagnostics | DIAGNOSTICS |
| LeveragePlot | Tangential and Jacobian leverages versus observation number | DIAGNOSTICS |
| LocalInfluencePlot | Local influence versus observation number | DIAGNOSTICS |
| ObservedByPredictedPlot | Dependent variable versus predicted values | DIAGNOSTICS(UNPACK) |
| ProjectedResidualHistogram | A histogram of the projected residuals | DIAGNOSTICS(UNPACK) |
| RawResidualExpectationPlot | Raw residual expectation versus predicted values | DIAGNOSTICS(UNPACK) |
| RawResidualHistogram | A histogram of the raw residuals | DIAGNOSTICS(UNPACK) |
| ResidualBoxPlot | A box plot of the raw and projected residuals | DIAGNOSTICS(UNPACK) |
| ResidualPanel | A panel of the raw and projected residuals versus the regressors | RESIDUALS |
| ResidualPlot | A plot of the raw and projected residuals versus the regressors | RESIDUALS(UNPACK) |
| ResidualByPredictedPlot | Raw and projected residuals versus the predicted values | DIAGNOSTICS(UNPACK) |
| RStudentByJacLeveragePlot | Standardized raw and projected residuals versus Jacobian leverage | DIAGNOSTICS(UNPACK) |
| RStudentByPredictedPlot | Standardized raw and projected residuals versus the predicted values | DIAGNOSTICS(UNPACK) |
| RStudentByTanLeveragePlot | Standardized raw and projected residuals versus tangential leverage | DIAGNOSTICS(UNPACK) |
Table 11: Graphs Controlled by the PROFILE Statement
| ODS Graph Name | Plot Description | PROFILE Option |
|---|---|---|
| ConfidenceCurve | Parameter value versus t value | CONFCURV |
| JackknifePlot | Absolute relative percentage difference versus observation number | JACKKNIFE |
| ProfiletPlot | Likelihood ratio pivotal statistic versus Wald pivotal statistic | TPLOT |
Table 12: Graphs Controlled by the BOOTSTRAP Statement
| ODS Graph Name | Plot Description | BOOTSTRAP Option |
|---|---|---|
| BootstrapHistPlot | A histogram of bootstrap parameter estimates | BOOTPLOTS(HIST) |
| BootstrapScatterPlot | Pairwise scatter plot of bootstrap parameter estimates | BOOTPLOTS(SCATTER) |
The "Convergence Status" table can be used to programmatically check the status of an estimation. This table contains the Status variable that takes on the value 0, 1, 2, or 3. If Status takes on a value less than 3, the convergence criterion was met. Specifically, the values mean the following:
indicates that the convergence criterion was met and no warning or error messages were issued during the PROC NLIN run. Also, no notes that could indicate a problem with the model were issued.
indicates that the convergence criterion was met and notes were written to the log that might indicate a problem with the model.
indicates that the convergence criterion was met and one or more warning messages were produced during the PROC NLIN run.
indicates that the convergence criterion was not met.
The following sample program demonstrates how the "Convergence Status" table can be used:
ods output ConvergenceStatus=ConvStatus;
proc nlin data=YourData;
parameters a=1 b=1 c=1;
model wgt = a + x / (b*y+c*z);
run;
data _null_;
set ConvStatus;
if status > 0 then put "A problem occurred";
run;