Appendix 13.1 Nonparametric Methods Using MegaStat

Appendix 13.1
Nonparametric Methods Using MegaStat
1
Appendix 13.1 ■ Nonparametric Methods Using MegaStat
The instructions in this section begin by describing the entry of data into an Excel worksheet. Alternatively, the
data may be downloaded from this book’s website. Please refer to Appendix 1.1 for further information about
entering data, saving data, and printing results in Excel. Please refer to Appendix 1.2 for more information about
using MegaStat.
Sign test for the median:
•
Enter the compact disc data into column A with
the label LifeTime in cell A1.
•
Select Add-Ins : MegaStat : Nonparametric
Tests : Sign Test.
•
In the Sign Test dialog box, use the autoexpand
feature to enter the range A1 : A21 into the
“Input range” window.
•
Enter the hypothesized median (here equal to
6000) into the “Hypothesized value” window.
•
Select the desired alternative (in this case
“greater than”) from the drop-down menu in
the Alternative box.
•
Click OK in the Sign Test dialog box.
Wilcoxon (also known as Mann–Whitney) rank sum
test for independent samples:
•
Enter the data for Catalyst XA-100 into column
A with label XA-100 in cell A1, and enter the
data for Catalyst ZB-200 into column B with
label ZB-200 in cell B1.
•
Select Add-Ins : MegaStat : Nonparametric
Tests : Wilcoxon–Mann/Whitney Test.
•
In the “Wilcoxon–Mann/Whitney Test” dialog
box, click in the Group 1 window to make it
active and use the autoexpand feature to enter
the range A1 : A6 into the Group 1 window.
•
Click in the Group 2 window to make it active,
and use the autoexpand feature to enter the
range B1 : B6 into the Group 2 window.
•
Select the desired alternative (in this case “not
equal”) from the drop-down menu in the
Alternative box.
•
Place a checkmark in the “Correct for ties”
checkbox.
•
Click OK in the “Wilcoxon–Mann/Whitney Test”
dialog box.
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Chapter 13
Nonparametric Methods
Wilcoxon signed ranks test for paired differences:
•
Enter the advertising study data. Enter the
preexposure scores in column A with label
PreAttitude, and enter the postexposure
scores in column B with label PostAttitude.
•
Select Add-Ins : MegaStat : Nonparametric
Tests : Wilcoxon Signed-Rank Test.
•
In the “Wilcoxon Signed Ranks Test” dialog
box, click in the Group 1 window to make
it active, and use the autoexpand feature
to enter the range A1 : A11 into the
Group 1 window.
•
Click in the Group 2 window to make it active,
and use the autoexpand feature to enter the
range B1 : B11 into the Group 2 window.
•
Select the desired alternative (in this case
“not equal”) from the drop-down menu in the
Alternative box.
•
Place a checkmark in the “Correct for ties”
checkbox.
•
Click OK in the “Wilcoxon Signed Ranks Test”
dialog box.
Kruskal–Wallis H test for comparing several
populations:
•
Enter the golf ball durability data into
columns A, B, C, and D as shown in the screen
with labels Alpha, Best, Century, and Divot.
•
Select Add-Ins : MegaStat : Nonparametric
Tests : Kruskal Wallis Test.
•
In the “Kruskal–Wallis Test” dialog box, enter
(by dragging with the mouse) the range A1:D6
into the “Input range” window. Each column
in the selected range will be considered by
MegaStat to be a group to be compared to
the other groups.
•
Place a checkmark in the “Correct for ties”
checkbox.
•
Click OK in the “Kruskal–Wallis Test” dialog
box.
Appendix 13.1
Spearman’s rank correlation coefficient:
•
Enter the sales data into columns A and B.
Enter the manager’s rankings into column A
with label “MgrRank, x” in cell A1, and enter
the units sold into column B with label
“UnitsSold, y” in cell B1.
•
Select Add-Ins : MegaStat : Nonparametric Tests :
Spearman Coefficient of Rank Correlation.
•
In the “Spearman Coefficient of Rank
Correlation” dialog box, enter (by dragging
with the mouse) the range A1 : B11 into the
“Input range” window. Here, each column in
the selected range will be considered by
MegaStat to be a separate variable.
•
Place a checkmark in the “Correct for ties”
checkbox.
•
Click OK in the “Spearman Coefficient of Rank
Correlation” dialog box.
Nonparametric Methods Using MegaStat
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