The GAM Procedure

specifies the SAS data set to be read by PROC GAM. The default value is the most recently created data set.

reverses the sorting order of all classification variables (specified in the CLASS statement). If both the DESCENDING and ORDER=  options are specified, PROC GAM orders the categories according to the ORDER=  option and then reverses that order. This option has the same effect as the classification variable option DESCENDING in the CLASS statement and the response variable option DESCENDING in the MODEL statement.

specifies the sorting order for the levels of all classification variables (specified in the CLASS statement). This ordering determines which parameters in the model correspond to each level in the data. Note that the ORDER=  option in the CLASS statement and the ORDER=  response variable option in the MODEL statement override the ORDER=  option in the PROC GAM statement.

controls the plots produced through ODS Graphics. When you specify only one plot-request, you can omit the parentheses around the plot-request. Here are some examples:

   plots=all
 
   plots=components(commonaxes)
 
   plots(unpack)=components(commonaxes clm)

ODS Graphics must be enabled before requesting plots. For example:

   ods graphics on;
   
   proc gam data=test plots(unpack)=components(commonaxes clm);
      model z=spline(x) spline(y);
   run;
   
   ods graphics off;

For more information about enabling and disabling ODS Graphics, see the section Enabling and Disabling ODS Graphics in Chapter 21, Statistical Graphics Using ODS.

With ODS Graphics enabled, the output graph by default is a panel of multiple plots of partial prediction curves of smoothing components, if PLOTS is not specified or no options are specified for PLOTS.