Statistics 9-17

The statistical variables are calculated as indicated below. Some are displayed
when 1-VAR STATS or 2-VAR STATS are calculated. You can access these
variables for use in expressions through the VARS STATISTICS... menus. If you
edit a list, all statistical variables are cleared.
Variables 1-VAR
STATS 2-VAR
STATS
LIN, LN,
EXP, PWR
REGS QUADREG VARS
Menu
v (mean of X values) Ÿ Ÿ ŸX/Y
GX (sum of X values) Ÿ Ÿ ŸG
GX2 (sum of X2 values) Ÿ Ÿ ŸG
SX (sample standard deviation of X) Ÿ Ÿ ŸX/Y
sX (population standard deviation of X) Ÿ Ÿ ŸX/Y
n (number of data points) Ÿ Ÿ Ÿ ŸX/Y
w (mean of Y values) Ÿ ŸX/Y
GY (sum of Y values) Ÿ ŸG
GYñ (sum of Y2 values) Ÿ ŸG
SY (sample standard deviation of Y) Ÿ ŸX/Y
sY (population standard deviation of Y) Ÿ ŸX/Y
GXY (sum of X × Y) Ÿ ŸG
MINX (minimum of X values) Ÿ ŸX/Y
MAXX (maximum of X values) Ÿ ŸX/Y
MINY (minimum of Y values) ŸX/Y
MAXY (maximum of Y values) ŸX/Y
Q1 (1st quartile) ŸBOX
MED (median) ŸBOX
Q3 (3rd quartile) ŸBOX
a, b (regression/fit coefficients) ŸEQ
a, b, c (quadratic coefficients) ŸEQ
r (correlation coefficient) Ÿ ŸEQ
REGEQ (regression equation) Ÿ ŸEQ

The quartile Q1 is the median of the ordinals to the left of

MED (median). The quartile Q3 is the median of the ordinals

to the right of MED.

If a frequency list contains noninteger values, SX and SY are

undefined. No values are displayed for them in the statistical

results. Q1, MED, and Q3 are also undefined if the frequency

list contains noninteger values.

If a frequency list contains a value larger than 99, Q1, MED,

and Q3 will not be calculated.

If the frequency for an element or data pair is zero, the

element or data pair is ignored in the calculation.

Statistical Variables
Q1 and Q3
Noninteger
Frequencies
Large
Frequencies
Zero
Frequencies