User Guide

Chapter 12: Statistics 209
Histogram
Histogram (Ò) plots one-variable data. The Xscl window variable value determines the width of
each bar, beginning at
Xmin. ZoomStat adjusts Xmin, Xmax, Ymin, and Ymax to include all values,
and also adjusts
Xscl. The inequality (Xmax N Xmin) à Xscl  47 must be true. A value that occurs on
the edge of a bar is counted in the bar to the right.
ModBoxplot
ModBoxplot (Õ) (modified box plot) plots one-variable data, like the regular box plot, except
points that are 1.5 … Interquartile Range beyond the quartiles. (The Interquartile Range is defined
as the difference between the third quartile
Q3 and the first quartile Q1.) These points are plotted
individually beyond the whisker, using the
Mark (› or + or ¦) you select. You can trace these points,
which are called outliers.
The prompt for outlier points is
x=, except when the outlier is the maximum point (maxX) or the
minimum point (
minX). When outliers exist, the end of each whisker will display x=. When no
outliers exist,
minX and maxX are the prompts for the end of each whisker. Q1, Med (median), and
Q3 define the box.
Box plots are plotted with respect to
Xmin and Xmax, but ignore Ymin and Ymax. When two box
plots are plotted, the first one plots at the top of the screen and the second plots in the middle.
When three are plotted, the first one plots at the top, the second in the middle, and the third at the
bottom.
Boxplot
Boxplot (Ö)(regular box plot) plots one-variable data. The whiskers on the plot extend from the
minimum data point in the set (
minX) to the first quartile (Q1) and from the third quartile (Q3) to the
maximum point (
maxX). The box is defined by Q1, Med (median), and Q3.
Box plots are plotted with respect to
Xmin and Xmax, but ignore Ymin and Ymax. When two box
plots are plotted, the first one plots at the top of the screen and the second plots in the middle.