SOCR EduMaterials AnalysisActivities Fisher Exact - Revision history

IvoDinov: /* Example */

2010-06-22T19:40:06Z

‎Example

2010-06-22T19:33:06Z

‎Example

2010-06-22T19:32:17Z

‎Example

2010-06-22T19:27:51Z

added the R vs. SOCR example

2009-09-18T16:20:25Z

‎Notes

2009-09-18T16:19:45Z

‎Notes: added a description of the p-value cutoff

2009-01-26T20:47:07Z

2009-01-23T05:18:50Z

2009-01-23T05:17:30Z

2007-08-25T19:24:21Z

‎SOCR Analyses Example on Fisher's Exact Test

@@ Line 46: / Line 46: @@
 ===Example===
-* [http://www.r-project.org/ R calculations]
+* If the “Cochran conditions” are satisfied (no cell has count zero, and more than 80% of the cells have counts at least 5) the [http://www.r-project.org/ R calculations] are based on asymptotic chi-squared probabilities and matrix simulation is done conditional on the row and column marginals, and works only if the marginals are strictly positive (Patefield algorithm, 1981).
 <code> > data <- matrix(c(13, 6, 29, 11, 16, 4), nr=3)</code><br>
 <code> > data</code><br>

@@ Line 61: / Line 61: @@
 * SOCR Calculations
 <center>[[Image:SOCR_AnalysisActivities_FishersExactTest_Fig4.png|500px]]</center>
-<hr>
 {{translate|pageName=http://wiki.stat.ucla.edu/socr/index.php?title=SOCR_EduMaterials_AnalysisActivities_FisherExact}}

@@ Line 60: / Line 60: @@
 * SOCR Calculations
-<center>[[Image:SOCR_AnalysisActivities_FishersExactTest_Fig4.png|700px]]</center>
+<center>[[Image:SOCR_AnalysisActivities_FishersExactTest_Fig4.png|500px]]</center>
 <hr>
 {{translate|pageName=http://wiki.stat.ucla.edu/socr/index.php?title=SOCR_EduMaterials_AnalysisActivities_FisherExact}}

@@ Line 45: / Line 45: @@
 * If your data is in any of these situations, we strongly recommend you also try the [http://www.socr.ucla.edu/htmls/ana/ChiSquareCT_Analysis.html SOCR Chi-Square Contingency Table Test], which is more stable, albeit also approximate. See the [[SOCR_EduMaterials_AnalysisActivities_Chi_Contingency | SOCR Chi-Square Contingency Table Activity]].
 <hr>
 {{translate|pageName=http://wiki.stat.ucla.edu/socr/index.php?title=SOCR_EduMaterials_AnalysisActivities_FisherExact}}

@@ Line 39: / Line 39: @@
 ** the matrix-sizes > 2 (i.e., N and/or K >2).
-* P-value-cutoff is <math>p_o</math>, the starting likelihood of the matrix, which is used to incrementally to compute the one-sided and the two-sided p-values of interest. Note that in general, the two-sided p-value will be quite different from 2 times the one-sided p-value!
+* P-value-cutoff is <math>p_o</math>, the starting likelihood of the matrix, which is used incrementally to compute the one-sided and the two-sided p-values of interest. Note that in general, the two-sided p-value will be quite different from 2 times the one-sided p-value!
 * In [http://socr.ucla.edu/htmls/SOCR_Analyses.html SOCR Analyses], to make this test work for all these situations, we use ''approximate'' p-values calculations according to the [http://www.siam.org/proceedings/datamining/2008/dm08_45_ojala.pdf MaskMetropolis MCMC method for random matrix generation].

@@ Line 32: / Line 32: @@
 '''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.
 <hr>
 {{translate|pageName=http://wiki.stat.ucla.edu/socr/index.php?title=SOCR_EduMaterials_AnalysisActivities_FisherExact}}

← Older revision		Revision as of 05:18, 23 January 2009
Line 30:		Line 30:
	<center>[[Image:SOCR_AnalysisActivities_ChiTable_Chu_061407_Fig3.gif\|700px]]</center>		<center>[[Image:SOCR_AnalysisActivities_ChiTable_Chu_061407_Fig3.gif\|700px]]</center>

−	'''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 1: / Line 1: @@
-=== SOCR Analyses Example on Fisher's Exact Test  ===
+== [[SOCR_EduMaterials_AnalysesActivities | SOCR Analysis Activities]] - SOCR Analyses Example on Fisher's Exact Test Activity ==
-This demo is based on an example from Wolfram MathWorld [http://mathworld.wolfram.com/FishersExactTest.html Fisher's Exact Test].
+===Background===
-'''Steps:'''
+===Steps===
 '''1.''' Click on "'''Fisher's Exact Test'''" from the conbo box in the left panel.
 <center>[[Image:SOCR_AnalysisActivities_FisherExact_Chu_061407_Fig1.gif|700px]]</center>
 <center>[[Image:SOCR_AnalysisActivities_FisherExact_Chu_061407_Fig1A.gif|450px]]</center>
 '''2.'''  Click on "'''Input'''" button. You'll see a screen like below waiting for your input
@@ Line 25: / Line 24: @@
 <center>[[Image:SOCR_AnalysisActivities_FisherExact_Chu_061407_Fig2B.gif|700px]]</center>
@@ Line 31: / Line 29: @@
 <center>[[Image:SOCR_AnalysisActivities_ChiTable_Chu_061407_Fig3.gif|700px]]</center>
 '''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.

← Older revision		Revision as of 19:24, 25 August 2007
Line 2:		Line 2:


−	This demo is based on an example from Wolfram MathWorld [http://mathworld.wolfram.com/FishersExactTest.html/ Fisher's Exact Test].	+	This demo is based on an example from Wolfram MathWorld [http://mathworld.wolfram.com/FishersExactTest.html Fisher's Exact Test].

	'''Steps:'''		'''Steps:'''