## (“Sigma Minus”)

Keyboard Access: x [vector]HP-28: STAT HP48S: LS-STAT RS-STAT LS-PREV HP48G: LS-STAT DATA LS-PLOT NXT STAT DATA HP49/50: 97 MENU (a statistics submenu) 91 MENU (a plotting submenu)Sigma Minus comand: Removes the bottom (most recent) row of the current statistics matrix (reserved variable ), and places it on the stack as a vector (or as a single number if is a one-column matrix). If empties , it purges it.and can be used to treat as a LIFO stack (a last in, first out buffer), which makes them generalized tools that are useful in applications other than statistics. Clever use of this technique can render new meanings to the statistics functions. For example, if you store multiple 3D vectors into , you can use the statistics functions to perform vector math on the entire vector space.

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