Displays a regression tree (R.W. Payne).
Option
PRINT = string tokens |
Controls printed output (summary, details, indented, bracketed, labelleddiagram, numbereddiagram, graph); default * i.e. none |
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Parameter
TREE = tree |
Tree to be displayed |
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Description
BRDISPLAY displays a regression tree, as constructed by the BREGRESSION procedure. The key can be saved from BREGRESSION (using the TREE option of BREGRESSION), and is specified for BRDISPLAY using the TREE parameter. The type of output is specified by the PRINT option, with settings:
summary |
prints a summary of the properties of the tree; |
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details |
gives detailed information about the nodes of the tree; |
bracketed |
display as used to represent an identification key in “bracketed” form (printed node by node). |
indented |
display as used to represent an identification key in “indented” form (printed branch by branch); |
labelleddiagram |
diagrammatic display including the node labels; |
numbereddiagram |
diagrammatic display with the nodes labelled by their numbers; |
graph |
plots the tree using high-resolution graphics. |
Option: PRINT.
Parameter: TREE.
Method
BRDISPLAY displays the tree using procedures BPRINT and BGRAPH.
See also
Procedures: BREGRESSION, BRKEEP, BRPREDICT.
Commands for: Regression analysis, Multivariate and cluster analysis.
Example
CAPTION 'BRDISPLAY example',!t('Water usage data (Draper & Smith 1981,',\
'Applied Regression Analysis, Wiley, New York).'); STYLE=meta,plain
READ temp,product,opdays,employ,water
58.8 7.107 21 129 3.067
65.2 6.373 22 141 2.828
70.9 6.796 22 153 2.891
77.4 9.208 20 166 2.994
79.3 14.792 25 193 3.082
81.0 14.564 23 189 3.898
71.9 11.964 20 175 3.502
63.9 13.526 23 186 3.060
54.5 12.656 20 190 3.211
39.5 14.119 20 187 3.286
44.5 16.691 22 195 3.542
43.6 14.571 19 206 3.125
56.0 13.619 22 198 3.022
64.7 14.575 22 192 2.922
73.0 14.556 21 191 3.950
78.9 18.573 21 200 4.488
79.4 15.618 22 200 3.295 :
"form the regression tree"
BREGRESSION [PRINT=*; Y=water; TREE=tree] employ,opdays,product,temp
"prune the tree"
BPRUNE [PRINT=table] tree; NEWTREES=pruned
"use tree 6 - renumber nodes"
BCUT [RENUMBER=yes] pruned[6]; NEWTREE=tree
"display the tree"
BRDISPLAY [PRINT=summary,details,indented,bracketed,labelleddiagram,\
numbereddiagram] tree