(“Sigma X Squared”)
Not in HP-28Keyboard 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 :