tag:blogger.com,1999:blog-5251183560375528307.post2082736612092687078..comments2021-04-14T06:39:12.986-05:00Comments on Bit Tooth Energy: Indiana Temperature dataHeading Outhttp://www.blogger.com/profile/01790783659594652657noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-5251183560375528307.post-81482805012912062462015-02-03T08:47:51.663-06:002015-02-03T08:47:51.663-06:00This comment has been removed by a blog administrator.Quân Đàohttps://www.blogger.com/profile/11091386334449403258noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-12773073154212663922015-02-03T08:47:46.270-06:002015-02-03T08:47:46.270-06:00This comment has been removed by a blog administrator.Quân Đàohttps://www.blogger.com/profile/11091386334449403258noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-76130138721156250942015-02-03T08:47:41.706-06:002015-02-03T08:47:41.706-06:00This comment has been removed by a blog administrator.Quân Đàohttps://www.blogger.com/profile/11091386334449403258noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-37839973158449622015-02-03T08:47:36.270-06:002015-02-03T08:47:36.270-06:00This comment has been removed by a blog administrator.Quân Đàohttps://www.blogger.com/profile/11091386334449403258noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-890881860113557342012-06-06T05:53:43.402-05:002012-06-06T05:53:43.402-05:00This comment has been removed by a blog administrator.Adminhttps://www.blogger.com/profile/00081308746416838515noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-74105509438195430132010-06-26T21:50:13.949-05:002010-06-26T21:50:13.949-05:00H.O. I'm specifically referring to the senten...H.O. I'm specifically referring to the sentence "But, as predicted by the hypothesis at the beginning of the post, there has not been a significant (i.e. R-squared greater than 0.05) increase in temperature over the 110 years.". I think any passing reader would assume that you meant "significance" in the sense of statistical significance - that is, allowing for noise, does Indiana appear to have been getting warmer since 1890. But the size of the R^2 has to do with the degree of correlation between two variables, and doesn't tell you whether or not the degree of linear trend is statistically significant. So it's not helpful in assessing whether or not Indiana is warming. For that, you have to use a proper linear regression significance test.Stuart Stanifordhttps://www.blogger.com/profile/07182839827506265860noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-30156728000901535212010-06-22T18:44:55.685-05:002010-06-22T18:44:55.685-05:00Porsena:
Since this is just a "for curios...Porsena:<br /> Since this is just a "for curiosity" calculation I am just using the Standard Deviation formula that exists on Excel.Heading Outhttps://www.blogger.com/profile/01790783659594652657noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-19171681645222438022010-06-21T20:52:18.454-05:002010-06-21T20:52:18.454-05:00HO, I'm wondering if you're using the conv...HO, I'm wondering if you're using the conventional calculation for the standard deviation. If you are, and the population mean is gradually increasing over the same period, the estimated standard deviation will be <a href="http://www.jstor.org/pss/2235765" rel="nofollow">larger than its true value</a>.porsenahttps://www.blogger.com/profile/04362269873149438270noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-50114020105795628272010-06-21T12:18:04.297-05:002010-06-21T12:18:04.297-05:00Stuart:
Actually now that I think about it a bit ...Stuart:<br /> Actually now that I think about it a bit more I don't think you quite understand what I am doing.<br /><br />I am using the measurement, which is a valid one, as sort of a filter to see what has most effect, and also as a simple initial guide to try and work out the major parameters. Vide the latitude relationship and the impact of longitude where it is, for example, actually tied to elevation.Heading Outhttps://www.blogger.com/profile/01790783659594652657noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-80891946097436655972010-06-20T17:14:47.169-05:002010-06-20T17:14:47.169-05:00To which I have now replied.To which I have now replied.Heading Outhttps://www.blogger.com/profile/01790783659594652657noreply@blogger.comtag:blogger.com,1999:blog-5251183560375528307.post-83233649047811673742010-06-20T11:25:34.439-05:002010-06-20T11:25:34.439-05:00H.O. See my comment to your last temperature post...H.O. See my comment to your last temperature post - R^2 > 0.05 is not a valid way of assessing statistical significance on a linear regression.Stuart Stanifordhttps://www.blogger.com/profile/07182839827506265860noreply@blogger.com