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The Compleat User RPL Encyclopedia


(“Sigma X Squared”)

  x

Not in HP-28

Keyboard Access:
  HP48S: LS-STAT LS-PREV
  HP48G: LS-STAT SUMS
HP49/50: 103 MENU (In the HP49/50,  is an alias for )
Sum of Squares of X Values command: Sums the squares of the values in the independent-variable column of the current statistical matrix (reserved variable ).

The independent-variable column is specified by the command and is stored as the first parameter in the reserved variable . The default independent-variable column number is 1.

Example: If the total of the squares of the values in the X column of your accumulated statistics data is 42, then  will return 42. The output will always be a non-negative real number.

To calculate the Frobenius norm (aka Euclidean norm) of the data in the X column of :

BYTES: 2.5