Matrix File Format

Statistica matrix files (such as Correlation, Covariances, Similarities, and Dissimilarities) can be used in the modules that support the matrix input file format.

By default, matrix spreadsheets are saved with the default file extension .smx. Most Statistica modules read both full and lower triangular matrices. However, in order for Statistica to recognize the file as a matrix file, the file must meet the following conditions:

• The number of cases (rows) = the number of variables (columns) + 4.
• The matrix must be a square matrix and the case names should be the same as the variable names.
• The last four cases contain the following case names and information:

  Option	Description
  Means	The mean of each variable is given in this row; this case can be left empty (that is, do not enter anything in this row) for Similarities and Dissimilarities matrices.
  Std.Dev	The standard deviation of each variable is given in this row; this case can be left empty (that is, do not enter anything in this row) for Similarities and Dissimilarities matrices.
  No.Cases	This required number is the number of cases from which the matrix was produced, not the number of cases (rows of data) in this matrix file.
  Matrix	This required number represents the type of matrix file; 1 = Correlation, 2 = Similarities, 3 = Dissimilarities, and 4 = Covariance.

  Note: When entering these last four cases into the matrix file manually, be sure to spell the case names exactly as they appear above (that is, Means, Std.Dev., No.Cases, and Matrix).