SAS Output  
Graph A: interaction between living area and number of rooms

    Plot of living*rooms.  Legend: A = 1 obs, B = 2 obs, etc.     
                                                                  
living ‚                                                          
       ‚                                                          
       ‚                                                          
  5000 ˆ                                                          
       ‚                                 A                        
       ‚                                                 A        
       ‚                                                          
       ‚                                                          
       ‚                             A                   A        
  4000 ˆ                                                          
       ‚                             A   B                        
       ‚                             A               A            
       ‚                         B       A               D        
       ‚                 A   A       A           A                
       ‚             A   A   A   B                                
  3000 ˆ             A   A   B       A                       B    
       ‚             A       A       A   B   A   A                
       ‚             B   C   A   A           A                    
       ‚             A   B   B   B   A   A   A                    
       ‚         A   D   G   B   G   A                            
       ‚         A   M   H   H   C                                
  2000 ˆ     A   B   D   O   K   B   B                            
       ‚     C   O   Z   Z   H   B                                
       ‚     D   Z   Z   Y   B                                    
       ‚ A   L   Z   Z   I   B                                    
       ‚ C   M   Z   M   D                                        
       ‚ F   Z   Z   F       A                                    
  1000 ˆ I   Z   Y   C                                            
       ‚ O   D   A                                                
       ‚ A   A                                                    
       ‚                                                          
       ‚                                                          
       ‚                                                          
     0 ˆ                                                          
       ‚                                                          
       Šƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒˆƒƒƒƒ
         4   5   6   7   8   9  10  11  12  13  14  15  16  17    
                                                                  
                                  rooms                           
                                                                  
NOTE: 180 obs hidden.                                             


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