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 ÙFREQ={1,4,1,3}, then the TI-83 Plus
interprets the instruction 1.Var Stats L1, ÙFREQ 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.