topic Wilcoxon Rank Sum test: Which one sided alternative hypothesis does SAS test, by default? in Statistical Procedures https://communities.sas.com/t5/Statistical-Procedures/Wilcoxon-Rank-Sum-test-Which-one-sided-alternative-hypothesis/m-p/492212#M25540 <P>Dear Members;</P><P>I have Pre and Post intervention data on 12 questions. I have calculated Median for all the 12 questions and applied the Wilcoxon test separately for all the questions. The compiled results are presented in a table. You can see that in question Q7 and Q8, P value (P&lt;Z) is &lt;0.0001. But I am not sure what alternative hypothesis is being tested in both the questions?&nbsp;</P><P>&nbsp;</P><TABLE><TBODY><TR><TD>Questions</TD><TD>Median&nbsp;</TD></TR><TR><TD>&nbsp;</TD><TD>Pre</TD><TD>Post</TD><TD>P&lt;Z</TD><TD>P&gt;|Z|</TD></TR><TR><TD>Q1</TD><TD>4</TD><TD>4</TD><TD><SPAN>0.0761</SPAN></TD><TD><SPAN>0.1521</SPAN></TD></TR><TR><TD>Q2</TD><TD>3</TD><TD>3</TD><TD>0.3202</TD><TD>0.6404</TD></TR><TR><TD>Q3</TD><TD>3</TD><TD>3</TD><TD><SPAN>0.0176</SPAN></TD><TD><SPAN>0.0351</SPAN></TD></TR><TR><TD>Q4</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q5</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q6</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q7</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q8</TD><TD>3</TD><TD>2</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q9</TD><TD>3</TD><TD>4</TD><TD><SPAN>0.0013</SPAN></TD><TD><SPAN>0.0025</SPAN></TD></TR><TR><TD>Q10</TD><TD>2.5</TD><TD>1</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q11</TD><TD>3</TD><TD>2.5</TD><TD><SPAN>0.1027</SPAN></TD><TD><SPAN>0.2053</SPAN></TD></TR><TR><TD>Q12</TD><TD>2.5</TD><TD>2</TD><TD><SPAN>0.0403</SPAN></TD><TD><SPAN>0.0805</SPAN></TD></TR></TBODY></TABLE> Tue, 04 Sep 2018 07:22:27 GMT Shristi 2018-09-04T07:22:27Z Wilcoxon Rank Sum test: Which one sided alternative hypothesis does SAS test, by default? https://communities.sas.com/t5/Statistical-Procedures/Wilcoxon-Rank-Sum-test-Which-one-sided-alternative-hypothesis/m-p/492212#M25540 <P>Dear Members;</P><P>I have Pre and Post intervention data on 12 questions. I have calculated Median for all the 12 questions and applied the Wilcoxon test separately for all the questions. The compiled results are presented in a table. You can see that in question Q7 and Q8, P value (P&lt;Z) is &lt;0.0001. But I am not sure what alternative hypothesis is being tested in both the questions?&nbsp;</P><P>&nbsp;</P><TABLE><TBODY><TR><TD>Questions</TD><TD>Median&nbsp;</TD></TR><TR><TD>&nbsp;</TD><TD>Pre</TD><TD>Post</TD><TD>P&lt;Z</TD><TD>P&gt;|Z|</TD></TR><TR><TD>Q1</TD><TD>4</TD><TD>4</TD><TD><SPAN>0.0761</SPAN></TD><TD><SPAN>0.1521</SPAN></TD></TR><TR><TD>Q2</TD><TD>3</TD><TD>3</TD><TD>0.3202</TD><TD>0.6404</TD></TR><TR><TD>Q3</TD><TD>3</TD><TD>3</TD><TD><SPAN>0.0176</SPAN></TD><TD><SPAN>0.0351</SPAN></TD></TR><TR><TD>Q4</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q5</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q6</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q7</TD><TD>3</TD><TD>4</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q8</TD><TD>3</TD><TD>2</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q9</TD><TD>3</TD><TD>4</TD><TD><SPAN>0.0013</SPAN></TD><TD><SPAN>0.0025</SPAN></TD></TR><TR><TD>Q10</TD><TD>2.5</TD><TD>1</TD><TD><SPAN>&lt;.0001</SPAN></TD><TD><SPAN>&lt;.0001</SPAN></TD></TR><TR><TD>Q11</TD><TD>3</TD><TD>2.5</TD><TD><SPAN>0.1027</SPAN></TD><TD><SPAN>0.2053</SPAN></TD></TR><TR><TD>Q12</TD><TD>2.5</TD><TD>2</TD><TD><SPAN>0.0403</SPAN></TD><TD><SPAN>0.0805</SPAN></TD></TR></TBODY></TABLE> Tue, 04 Sep 2018 07:22:27 GMT https://communities.sas.com/t5/Statistical-Procedures/Wilcoxon-Rank-Sum-test-Which-one-sided-alternative-hypothesis/m-p/492212#M25540 Shristi 2018-09-04T07:22:27Z Re: Wilcoxon Rank Sum test: Which one sided alternative hypothesis does SAS test, by default? https://communities.sas.com/t5/Statistical-Procedures/Wilcoxon-Rank-Sum-test-Which-one-sided-alternative-hypothesis/m-p/492482#M25550 <P>It would help to show the code used to generate the values as that is likely to contain the information you are requesting either by default (no specific alternative0 or an option.</P> Tue, 04 Sep 2018 20:53:20 GMT https://communities.sas.com/t5/Statistical-Procedures/Wilcoxon-Rank-Sum-test-Which-one-sided-alternative-hypothesis/m-p/492482#M25550 ballardw 2018-09-04T20:53:20Z