Page 15 - Statistics II for Dummies

Part V: Nonparametric Statistics: Table of Contents xiii
Rebels without a Distribution .................................... 273

Chapter 16: Going Nonparametric. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .275
Arguing for Nonparametric Statistics .......................................................275
No need to fret if conditions aren’t met ..........................................276
The median’s in the spotlight for a change ....................................277
So, what’s the catch? .........................................................................279
Mastering the Basics of Nonparametric Statistics ..................................280
Sign ......................................................................................................280
Rank .....................................................................................................282
Signed rank .........................................................................................283
Rank sum .............................................................................................284
Chapter 17: All Signs Point to the Sign Test
and Signed Rank Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .287
Reading the Signs: The Sign Test ...............................................................288
Testing the median ............................................................................290
Estimating the median.......................................................................292
Testing matched pairs.......................................................................294
Going a Step Further with the Signed Rank Test .....................................296
A limitation of the sign test ..............................................................296
Stepping through the signed rank test ............................................297
Losing weight with signed ranks ......................................................298
Chapter 18: Pulling Rank with the Rank Sum Test. . . . . . . . . . . . . . . .303
Conducting the Rank Sum Test ..................................................................303
Checking the conditions ...................................................................303
Stepping through the test .................................................................304
Stepping up the sample size .............................................................306
Performing a Rank Sum Test: Which Real Estate Agent
Sells Homes Faster? .................................................................................307
Checking the conditions for this test ..............................................307
Testing the hypotheses .....................................................................309
Chapter 19: Do the Kruskal-Wallis and
Rank the Sums with the Wilcoxon . . . . . . . . . . . . . . . . . . . . . . . . . . . . .313
Doing the Kruskal-Wallis Test to Compare More
than Two Populations .............................................................................313
Checking the conditions ...................................................................315
Setting up the test ..............................................................................317
Conducting the test step by step .....................................................317

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