SOCR EduMaterials AnalysisActivities Friedman - Revision history

IvoDinov at 20:14, 10 January 2013

2013-01-10T20:14:37Z

IvoDinov at 19:54, 23 January 2009

2009-01-23T19:54:02Z

Annie: /* SOCR Analyses Example on the Friedman Test */

2007-08-25T08:43:00Z

‎SOCR Analyses Example on the Friedman Test

Annie: /* SOCR Analyses Example on the Friedman Test */

2007-08-25T08:37:55Z

‎SOCR Analyses Example on the Friedman Test

Annie: /* SOCR Analyses Example on the Friedman Test */

2007-08-25T08:31:08Z

‎SOCR Analyses Example on the Friedman Test

Annie: /* Kruskal-Wallis Test Background */

2007-08-25T08:26:28Z

‎Kruskal-Wallis Test Background

Annie at 08:01, 25 August 2007

2007-08-25T08:01:30Z

New page

== Friedman's Test Example ==
=== Kruskal-Wallis Test Background===

The Friedman's Test is a non-parametric test utilizing ranks of the data. Suppose there are k groups, each group has data from a set of blocks. That is, the data are blocked or matched. The hypotheses are written as:

'''Null Hypothesis H_0''': All of the k population distribution functions are identical.

'''Alternative Hypothesis H_A''': At least one of the populations tends to yield larger observations than at least one of the other populations.

Rank sum is employed for hypothese testing. Note that the sample size for each group do have to be the same.

=== SOCR Analyses Example on the Friedman Test===

The example we show here is from "Practical Nonparametric Statistics" by Conover, Second Edition, John Wiley & Sons, 1980. (Page 297-299)

'''Steps:'''

'''1.''' The data of this example has 4 groups: A, B, C and D. Click on "'''Two Independent Friedman's Test'''" from the conbo box in the left panel.

<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig1.gif|700px]]</center>

<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig1A.gif|450px]]</center>

'''2.''' Click on "'''Example 2'''" button. than the "Data" button to see the data.
<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2.gif|700px]]</center>

'''3.''' The data need to be send to the computer for analysis. In the Friedman test, at least two groups need to be included. You can certainly include any two groups, any three groups, or all the avaialble groups, etc., from the data set. The test will only analyze the groups selected. Therefore, you'll need to let the computer know what groups you're choosing. This is done in the "Mapping" panel. Click on the "Mapping" button to include the groups you want.

<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2.gif|700px]]</center>

'''4.''' Next, click on the "'''Calculate'''" button. Now you're ready to see the results. Just click on the "Result" button.

<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig3.gif|700px]]</center>

Scroll down to see complete results.

If you'd like to include some other group(s) or remove the current groups and start over, simply go to the '''Mapping''' button and take the groups you want.

'''Note''': if you happen to click on the "Clear" button in the middle of the procedure, all the data will be cleared out. Simply start over from step 1 and reteive the data by click an '''EXAMPLE''' button.

<hr>

{{translate|pageName=http://wiki.stat.ucla.edu/socr/index.php?title=SOCR_EduMaterials_AnalysisActivities_Friedman}}

← Older revision		Revision as of 20:14, 10 January 2013
Line 47:		Line 47:
	'''Note''': if you happen to click on the "Clear" button in the middle of the procedure, all the data will be cleared out. Simply start over from step 1 and retrieve the data by clicking an '''EXAMPLE''' button.		'''Note''': if you happen to click on the "Clear" button in the middle of the procedure, all the data will be cleared out. Simply start over from step 1 and retrieve the data by clicking an '''EXAMPLE''' button.

		+	===See also===
		+	* [[SOCR_Analyses_Expansion#Adding_the_Skillings-Mack_.28SM.29_Analysis_of_Treatment_Effects_for_Unbalanced_Designs\| Skillings-Mack (SM) Analysis of Treatment Effects for Unbalanced Designs]]

@@ Line 1: / Line 1: @@
-== Friedman's Test Example  ==
+== [[SOCR_EduMaterials_AnalysesActivities | SOCR Analysis]] - Friedman's Test==
 === Friedman's Test Background===
 The Friedman's Test is a non-parametric test utilizing ranks of the data. Suppose there are k groups, each group has data from a set of blocks. That is, the data are blocked or matched. The hypotheses are written as:
@@ Line 9: / Line 9: @@
 '''Alternative Hypothesis H_A''': At least one of the populations tends to yield larger observations than at least one of the other populations.
-Rank sum is employed for hypothese testing. Note that the sample size for each group do have to be the same.
+Rank sum is employed for hypotheses testing. Note that the sample size for each group do have to be the same.
 === SOCR Analyses Example on the Friedman's Test===
+Go to the [http://www.socr.ucla.edu/htmls/ana/FriedmansTest_Analysis.html SOCR Friedman's Test Applet]. The example we show here is from "Practical Nonparametric Statistics" by Conover, Second Edition, John Wiley & Sons, 1980. (Page 297-299)
 '''Steps:'''
-'''1.''' The data of this example has 4 groups: A, B, C and D. Click on "''' Friedman's Test'''" from the conbo box in the left panel.
+'''1.''' The data of this example has 4 groups: A, B, C and D. Click on "''' Friedman's Test'''" from the combo box in the left panel.
@@ Line 31: / Line 29: @@
 <center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2.gif|700px]]</center>
-'''3.''' The data need to be send to the computer for analysis. In the Friedman test, at least two groups need to be included. You can certainly include any two groups, any three groups, or all the avaialble groups, etc., from the data set. The test will only analyze the groups selected. Therefore, you'll need to let the computer know what groups you're choosing. This is done in the "Mapping" panel. Click on the "Mapping" button to include the groups you want.
+'''3.''' The data need to be send to the computer for analysis. In the Friedman test, at least two groups need to be included. You can certainly include any two groups, any three groups, or all the available groups, etc., from the data set. The test will only analyze the groups selected. Therefore, you'll need to let the computer know what groups you're choosing. This is done in the "Mapping" panel. Click on the "Mapping" button to include the groups you want.
 <center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2A.gif|700px]]</center>
@@ Line 47: / Line 45: @@
-'''Note''': if you happen to click on the "Clear" button in the middle of the procedure, all the data will be cleared out. Simply start over from step 1 and reteive the data by click an '''EXAMPLE''' button.
+'''Note''': if you happen to click on the "Clear" button in the middle of the procedure, all the data will be cleared out. Simply start over from step 1 and retrieve the data by clicking an '''EXAMPLE''' button.

@@ Line 11: / Line 11: @@
 Rank sum is employed for hypothese testing. Note that the sample size for each group do have to be the same.
-=== SOCR Analyses Example on the Friedman Test===
+=== SOCR Analyses Example on the Friedman's Test===
@@ Line 36: / Line 36: @@
-'''4.''' Next, click on the "'''Calculate'''" button. Now you're ready to see the results. Just click on the "Result" button.
+'''4.''' Next, click on the "'''Calculate'''" button. Now you're ready to see the results. Just click on the "Result" button. Note that ranks are shown in parentheses.

← Older revision		Revision as of 08:37, 25 August 2007
Line 33:		Line 33:
	'''3.''' The data need to be send to the computer for analysis. In the Friedman test, at least two groups need to be included. You can certainly include any two groups, any three groups, or all the avaialble groups, etc., from the data set. The test will only analyze the groups selected. Therefore, you'll need to let the computer know what groups you're choosing. This is done in the "Mapping" panel. Click on the "Mapping" button to include the groups you want.		'''3.''' The data need to be send to the computer for analysis. In the Friedman test, at least two groups need to be included. You can certainly include any two groups, any three groups, or all the avaialble groups, etc., from the data set. The test will only analyze the groups selected. Therefore, you'll need to let the computer know what groups you're choosing. This is done in the "Mapping" panel. Click on the "Mapping" button to include the groups you want.

−	<center>[[Image:~~SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2~~.gif\|700px]]</center>	+	<center>[[Image:SOCR_AnalysisActivities_Friedman_Chu_061407_Fig2A.gif\|700px]]</center>

← Older revision		Revision as of 08:31, 25 August 2007
Line 19:		Line 19:
	'''Steps:'''		'''Steps:'''

−	'''1.''' The data of this example has 4 groups: A, B, C and D. Click on "'''~~Two Independent~~ Friedman's Test'''" from the conbo box in the left panel.	+	'''1.''' The data of this example has 4 groups: A, B, C and D. Click on "''' Friedman's Test'''" from the conbo box in the left panel.