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HP HP-12c Manual

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Section 6
Statistics Functions
Accumulating Statistics
The HP 12C Platinum can perform one- or two-variable statistical calculations.
The data is entered into the calculator using the _ key, which automatically
calculates and stores statistics of the data into storage registers R
1
, through R
6
.
(These registers are therefore referred to as the “statistics registers.”)
Before beginning to accumulate statistics for a new set of data, you should clear
the statistics registers by pressing fCLEAR².
20
In one-variable statistical calculations, to enter each data point – referred to as an
“x-value” – key the x-value into the display, then press _.
In two-variable statistical calculations, to enter each data pair – referred to as the
“x- and y-values”:
1. Key the y-value into the display.
2. Press \.
3. Key the x-value into the display.
4. Press _.
Each time you press _, the calculator does the following:
z The number in R
1
is increased by 1, and the result is copied into the
display.
z The x-value is added to the number in R
2
.
z The square of the x-value is added to the number in R
3
.
z The y-value is added to the number in R
4
.
z The square of the y-value is added to the number in R
5
.
z The product of the x- and y-values is added to the number in R
6
.
The table below shows where the accumulated statistics are stored.
20.
This also clears the stack registers and the display.
… 76 …


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