Frequency of occurrence for data points, Var stats – Texas Instruments TI-83 PLUS User Manual

Page 360

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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

L

1

={15,12,9,14}

and

Ù

FREQ={1,4,1,3}

, then the

TI-83 Plus

interprets the instruction

1

.

Var Stats

L

1

,

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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