BCIDENTIFY procedure

Identifies specimens using a classification tree (R.W. Payne).


Options

PRINT = strings
Controls printed output (identification, transcript); if PRINT is unset in an interactive run BCIDENTIFY will ask what you want to print, in a batch run the default is iden

TREE = tree
Specifies the tree

IDENTIFICATION = variate
Saves the identification of each specimen

TERMINALNODE = variate
Saves numbers of the terminal nodes reached by the specimens


Parameter

X = factors or variates
Observed data values for the specimens


Description

BCIDENTIFY identifies specimens using a classification tree, as constructed by the BCLASSIFICATION procedure. The tree can be saved from BCLASSIFICATION (using the TREE option of BCLASSIFICATION), and specified for BCIDENTIFY using its own TREE option. Alternatively, BCIDENTIFY will ask you for the identifier of the tree if you do not specify TREE when running interactively.

   The characteristics of the specimens can be specified using the X parameter. This must be set to a list of factors and variates with names (and levels) identical to those used originally to construct the tree. If you do not set X when running interactively, BCIDENTIFY will ask you to examine the relevant characteristics in turn, as required by the tree.

   The PRINT option controls printed output, with settings:

    identification
prints the identifications obtained using the tree;

    transcript
prints the observed characteristics when supplied in response to questions in an interactive run.

If you do not set PRINT in an interactive run, BCIDENTIFY will ask what you would like to print. In batch, the default is to print the identifications.

   The IDENTIFICATION option allows you to save the identifications (in a text), and the TERMINALNODE option allows you to save a variate containing the numbers of the terminal nodes that the specimens reached in the tree.

 

Options: PRINT, TREE, IDENTIFICATION, TERMINALNODE.

Parameter: X.


Method

BCIDENTIFY works its way through the key using the standard tree functions,

BNBRANCHES and BNEXT.