Bioequivalence and Bioavailability Forum

K2K ★ India, 2013-02-20 09:10 (4463 d 03:22 ago) Posting: # 10075 Views: 7,554	Cook distance [Outliers] Post reply
	Dear All can any one provide me the literature for Cook distance and Table for Critical Value reference. Thanks in advance — thanks and regards Karthik

Helmut
★★★

Vienna, Austria,
2013-02-20 15:49
(4462 d 20:43 ago)

@ K2K
Posting: # 10078
Views: 6,212

Cook’s distance

Post reply

Hi Karthik,

see Wikipedia.
Run the analysis on the model’s residuals. I would not try to dive into critical values because many approaches have been suggested in the literature. Simply draw an xy-plot, where x is the subject’s index and y Cook’s distance. If there are “influential values” they will catch your eye. ;-)

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Dif-tor heh smusma 🖖🏼 Довге життя Україна!
Helmut Schütz

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K2K ★ India, 2013-02-21 07:40 (4462 d 04:52 ago) @ Helmut Posting: # 10090 Views: 6,045	Cook’s distance Post reply
	Hi helmut, ❝ Simply draw an xy-plot, where x is the subject’s index and y Cook’s distance. If there are “influential values” they will catch your eye. by using the prog reg and gplot (subject vs dffits) I plot the graph for cook distance method, whether its correct. Thanks for your reply. — thanks and regards Karthik

Helmut
★★★

Vienna, Austria,
2013-02-21 18:44
(4461 d 17:48 ago)

@ K2K
Posting: # 10095
Views: 6,048

Cook’s distance

Post reply

Hi Karthik,

❝ by using the prog reg and gplot (subject vs dffits) I plot the graph for cook distance method, whether its correct.

I don’t know this software. Looks like you have included both treatment periods from a 2×2×2 cross over study. Residuals from both periods should have the same values and differ in their signs. Rerun the analysis with one period only. Here is an example obtained with R, package bear:
[image]

—
Dif-tor heh smusma 🖖🏼 Довге життя Україна!
Helmut Schütz

The quality of responses received is directly proportional to the quality of the question asked. 🚮
Science Quotes

K2K ★ India, 2013-02-22 13:22 (4460 d 23:10 ago) (edited on 2013-02-22 22:46) @ Helmut Posting: # 10103 Views: 5,823	Cook’s distance Post reply
	Hi Helmut, thanks for your reply and suggestion. — thanks and regards Karthik

Cook distance [Outliers]

Cook’s distance

Cook’s distance

Cook’s distance

Cook’s distance