What does these mean in statistical sense??
I have 2 random variables (X and Y). The covariance,c was found equal to 20.2006 and their correlation coefficient,p was 0.0245. From the statistical book, if their c=0, means that X and Y are uncorrelated i.e p=0. However, in my case, c is quite large but p is extremely small...So, what justification could I said with this kind of data?? Thanks.. CCC = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: What does these mean in statistical sense??
Chia C Chong wrote: I have 2 random variables (X and Y). The covariance,c was found equal to 20.2006 and their correlation coefficient,p was 0.0245. From the statistical book, if their c=0, means that X and Y are uncorrelated i.e p=0. However, in my case, c is quite large but p is extremely small...So, what justification could I said with this kind of data?? It measn the variances are large. If s_A is the standard deviation of A, then p_XY = c_XY/(s_X*s_Y) So for your data, s_X*s_Y = 824.5. This is why we use p, it's re-scaled so that the variances are 1, so we can compare correlations of variables with different variances. In this case, p looks very close to 0. Bob -- Bob O'Hara Metapopulation Research Group Division of Population Biology Department of Ecology and Systematics PO Box 17 (Arkadiankatu 7) FIN-00014 University of Helsinki Finland tel: +358 9 191 28779 mobile: +358 50 599 0540 (Yes, I have finally joined 21st Century Finland) fax: +358 9 191 28701email: [EMAIL PROTECTED] To induce catatonia, visit http://www.helsinki.fi/science/metapop/ It is being said of a certain poet, that though he tortures the English language, he has still never yet succeeded in forcing it to reveal his meaning - Beachcomber = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: What does these mean in statistical sense??
This is a multi-part message in MIME format. --D8246F46A01791942B12542B Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit try doing a scattergram of your two variables. It should look much more like a cloud than a line. Anon. wrote: Chia C Chong wrote: I have 2 random variables (X and Y). The covariance,c was found equal to 20.2006 and their correlation coefficient,p was 0.0245. From the statistical book, if their c=0, means that X and Y are uncorrelated i.e p=0. However, in my case, c is quite large but p is extremely small...So, what justification could I said with this kind of data?? It measn the variances are large. If s_A is the standard deviation of A, then p_XY = c_XY/(s_X*s_Y) So for your data, s_X*s_Y = 824.5. This is why we use p, it's re-scaled so that the variances are 1, so we can compare correlations of variables with different variances. In this case, p looks very close to 0. Bob -- Bob O'Hara Metapopulation Research Group Division of Population Biology Department of Ecology and Systematics PO Box 17 (Arkadiankatu 7) FIN-00014 University of Helsinki Finland tel: +358 9 191 28779 mobile: +358 50 599 0540 (Yes, I have finally joined 21st Century Finland) fax: +358 9 191 28701email: [EMAIL PROTECTED] To induce catatonia, visit http://www.helsinki.fi/science/metapop/ It is being said of a certain poet, that though he tortures the English language, he has still never yet succeeded in forcing it to reveal his meaning - Beachcomber --D8246F46A01791942B12542B Content-Type: text/x-vcard; charset=us-ascii; name=Arthur.Kendall.vcf Content-Transfer-Encoding: 7bit Content-Description: Card for Art Kendall Content-Disposition: attachment; filename=Arthur.Kendall.vcf begin:vcard n:Kendall;Art tel;work:301-864-5570 x-mozilla-html:FALSE adr:;; version:2.1 email;internet:[EMAIL PROTECTED] fn:Art Kendall end:vcard --D8246F46A01791942B12542B-- = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
Re: What does these mean in statistical sense??
Thanks for all the helpful suggestions... Cheers, CCC Art Kendall [EMAIL PROTECTED] wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... try doing a scattergram of your two variables. It should look much more like a cloud than a line. Anon. wrote: Chia C Chong wrote: I have 2 random variables (X and Y). The covariance,c was found equal to 20.2006 and their correlation coefficient,p was 0.0245. From the statistical book, if their c=0, means that X and Y are uncorrelated i.e p=0. However, in my case, c is quite large but p is extremely small...So, what justification could I said with this kind of data?? It measn the variances are large. If s_A is the standard deviation of A, then p_XY = c_XY/(s_X*s_Y) So for your data, s_X*s_Y = 824.5. This is why we use p, it's re-scaled so that the variances are 1, so we can compare correlations of variables with different variances. In this case, p looks very close to 0. Bob -- Bob O'Hara Metapopulation Research Group Division of Population Biology Department of Ecology and Systematics PO Box 17 (Arkadiankatu 7) FIN-00014 University of Helsinki Finland tel: +358 9 191 28779 mobile: +358 50 599 0540 (Yes, I have finally joined 21st Century Finland) fax: +358 9 191 28701email: [EMAIL PROTECTED] To induce catatonia, visit http://www.helsinki.fi/science/metapop/ It is being said of a certain poet, that though he tortures the English language, he has still never yet succeeded in forcing it to reveal his meaning - Beachcomber = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =
