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TI-83 Plus Statistics 357
Frequency of Occurrence for Data Points
For most
STAT CALC
menu items, you can specify a list of data
occurrences, or frequencies (
freqlist
).
Each element in
freqlist
indicates how many times the corresponding data
point or data pair occurs in the data set you are analyzing.
For example, if
L1={15,12,9,14}
and
Ù
FREQ={1,4,1,3}
, then the TI-83 Plus
interprets the instruction
1
.
Var Stats
L1
,
Ù
FREQ
to mean that
15
occurs
once,
12
occurs four times,
9
occurs once, and
14
occurs three times.
Each element in
freqlist
must be
‚
0, and at least one element must be > 0.
Noninteger
freqlist
elements are valid. This is useful when entering
frequencies expressed as percentages or parts that add up to 1.
However, if
freqlist
contains noninteger frequencies,
Sx
and
Sy
are
undefined; values are not displayed for
Sx
and
Sy
in the statistical
results.
1
.
Var Stats
1
.
Var Stats
(one-variable statistics) analyzes data with one measured
variable. Each element in
freqlist
is the frequency of occurrence for each
corresponding data point in
Xlistname
.
freqlist
elements must be real
numbers > 0.
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