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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
Ÿ
X/Y
G
X
(sum of X values)
Ÿ
Ÿ
ŸG
G
X
2
(sum of X
2
values)
Ÿ
Ÿ
ŸG
SX
(sample standard deviation of X)
Ÿ
Ÿ
Ÿ
X/Y
s
X
(population standard deviation of X)
Ÿ
Ÿ
Ÿ
X/Y
n
(number of data points)
Ÿ
Ÿ
Ÿ
Ÿ
X/Y
w
(mean of Y values)
Ÿ
Ÿ
X/Y
G
Y
(sum of Y values)
Ÿ
ŸG
G
Y
ñ
(sum of Y
2
values)
Ÿ
ŸG
SY
(sample standard deviation of Y)
Ÿ
Ÿ
X/Y
s
Y
(population standard deviation of Y)
Ÿ
Ÿ
X/Y
G
XY
(sum of X
×
Y)
Ÿ
ŸG
MINX
(minimum of X values)
Ÿ
Ÿ
X/Y
MAXX
(maximum of X values)
Ÿ
Ÿ
X/Y
MINY
(minimum of Y values)
Ÿ
X/Y
MAXY
(maximum of Y values)
Ÿ
X/Y
Q1
(1st quartile)
Ÿ
BOX
MED
(median)
Ÿ
BOX
Q
3
(3rd quartile)
Ÿ
BOX
a
,
b
(regression/fit coefficients)
Ÿ
EQ
a
,
b
,
c
(quadratic coefficients)
Ÿ
EQ
r
(correlation coefficient)
Ÿ
Ÿ
EQ
REGEQ
(regression equation)
Ÿ
Ÿ
EQ
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