Talk:Principal Components Analysis - Revision history

⚠️NikosA: /* ToDo */

2010-07-21T20:24:18Z

ToDo

← Older revision		Revision as of 20:24, 21 July 2010
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	== ToDo ==		== ToDo ==

	Need to update the "numbers" derived from i.pca (bug-fix [http://trac.osgeo.org/grass/changeset/39800 39800] gives correct numbers, identical to R's ''prcomp()'' function). --[[User:NikosA\|Nikos]] 05:26, 9 May 2010 (UTC)		* Need to update the "numbers" derived from i.pca (bug-fix [http://trac.osgeo.org/grass/changeset/39800 39800] gives correct numbers, identical to R's ''prcomp()'' function). --[[User:NikosA\|Nikos]] 05:26, 9 May 2010 (UTC)

			* Complete review of the content, check terminology (especially for SVD, i.e. use "singular values, vectors" where and when ever required) --[[User:NikosA\|Nikos]] 20:24, 21 July 2010 (UTC)

⚠️NikosA: moved Talk:Principal Component Analysis to Talk:Principal Components Analysis: Correct terminology

2010-07-21T20:17:39Z

moved Talk:Principal Component Analysis to Talk:Principal Components Analysis: Correct terminology

← Older revision	Revision as of 20:17, 21 July 2010
(No difference)

⚠️NikosA: /* ToDo */ new section

2010-05-09T05:26:20Z

ToDo: new section

← Older revision		Revision as of 05:26, 9 May 2010
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	Added examples with SPOT from the Spearfish dataset. Confused about i.pca's performance: there seems to be no problem with the SPOT images, that is, the results of i.pca are almost identical with the results of R's prcomp() with centering. This is different than the example using MODIS data. Perhaps it depends on the range of the input data?!--[[User:NikosA\|Nikos]] 04:45, 31 March 2009 (UTC)		Added examples with SPOT from the Spearfish dataset. Confused about i.pca's performance: there seems to be no problem with the SPOT images, that is, the results of i.pca are almost identical with the results of R's prcomp() with centering. This is different than the example using MODIS data. Perhaps it depends on the range of the input data?!--[[User:NikosA\|Nikos]] 04:45, 31 March 2009 (UTC)

			== ToDo ==

			Need to update the "numbers" derived from i.pca (bug-fix [http://trac.osgeo.org/grass/changeset/39800 39800] gives correct numbers, identical to R's ''prcomp()'' function). --[[User:NikosA\|Nikos]] 05:26, 9 May 2010 (UTC)

⚠️NikosA at 04:45, 31 March 2009

2009-03-31T04:45:01Z

← Older revision		Revision as of 04:45, 31 March 2009
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	Thanks for the <span style="color:#900000">idea</span>.--[[User:NikosA\|Nikos]] 04:54, 16 March 2009 (UTC)		Thanks for the <span style="color:#900000">idea</span>.--[[User:NikosA\|Nikos]] 04:54, 16 March 2009 (UTC)

			Added examples with SPOT from the Spearfish dataset. Confused about i.pca's performance: there seems to be no problem with the SPOT images, that is, the results of i.pca are almost identical with the results of R's prcomp() with centering. This is different than the example using MODIS data. Perhaps it depends on the range of the input data?!--[[User:NikosA\|Nikos]] 04:45, 31 March 2009 (UTC)

⚠️NikosA at 04:54, 16 March 2009

2009-03-16T04:54:34Z

← Older revision		Revision as of 04:54, 16 March 2009
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	Some appearance editing--[[User:NikosA\|Nikos]] 14:18, 8 March 2009 (UTC)		Some appearance editing--[[User:NikosA\|Nikos]] 14:18, 8 March 2009 (UTC)

			Thanks for the <span style="color:#900000">idea</span>.--[[User:NikosA\|Nikos]] 04:54, 16 March 2009 (UTC)

⚠️NikosA at 14:18, 8 March 2009

2009-03-08T14:18:28Z

← Older revision		Revision as of 14:18, 8 March 2009
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	I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft.		I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft.
	--[[User:NikosA\|Nikos]] 00:26, 7 March 2009 (UTC)		--[[User:NikosA\|Nikos]] 00:26, 7 March 2009 (UTC)

	Some appearance editing--[[User:NikosA\|Nikos]] 14:18, 8 March 2009 (UTC)		Some appearance editing--[[User:NikosA\|Nikos]] 14:18, 8 March 2009 (UTC)

⚠️NikosA at 14:18, 8 March 2009

2009-03-08T14:18:12Z

← Older revision		Revision as of 14:18, 8 March 2009
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	I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft.		I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft.
	--[[User:NikosA\|Nikos]] 00:26, 7 March 2009 (UTC)		--[[User:NikosA\|Nikos]] 00:26, 7 March 2009 (UTC)
			Some appearance editing--[[User:NikosA\|Nikos]] 14:18, 8 March 2009 (UTC)

⚠️NikosA: New page: I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft. --~~~~

2009-03-07T00:26:20Z

New page: I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft. --~~~~

New page

I have started the PCA-wikipage as suggested by Markus. Apologies for the rough-looking first-draft.
--[[User:NikosA|Nikos]] 00:26, 7 March 2009 (UTC)