tag:blogger.com,1999:blog-2424328492215531658.post4190377882682963025..comments2019-07-25T21:56:27.833+02:00Comments on NIR-Quimiometria: Mahalanobis distance with "R" (Exercice)José Ramón Cuestahttp://www.blogger.com/profile/01637083082643255576noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-2424328492215531658.post-10119504334295850932017-08-10T14:59:02.485+02:002017-08-10T14:59:02.485+02:00How to do analysis of NIR spectra using Rstudio, h...How to do analysis of NIR spectra using Rstudio, how to prepare data frame and NIR spectra as input. <br /><br />what is the package?M D Oakhttps://www.blogger.com/profile/12346413933695315924noreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-60156543164649648562017-07-06T19:10:13.298+02:002017-07-06T19:10:13.298+02:00I consider the mahalanobis distance as the distanc...I consider the mahalanobis distance as the distance of every sample to the center of the population in a Principal Component Space. So the calculations are based on the score matrix of the samples, for a certain number on terms (PC components). This is important to see if a sample belongs to a population, or if it must be considered as an outlier. In this case I only get a MD value for every sample.<br />We can se a full matrix with the MD distances from a sample to the rest of the samples in the PC space, and this is the Neigbour Mahalanobis distance that you can ger with other packages.José Ramón Cuestahttps://www.blogger.com/profile/01637083082643255576noreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-7081285980240501852017-07-04T19:57:16.952+02:002017-07-04T19:57:16.952+02:00how can i create a distance matrix using Mahalanob...how can i create a distance matrix using Mahalanobis distance??Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-77287819748335009042013-11-12T23:04:34.472+01:002013-11-12T23:04:34.472+01:00Best post about Mahalanobis in "R"!!
But...Best post about Mahalanobis in "R"!!<br />But I have a doubt........<br />Is there an easy way to calculate the full Mahalanobis matrix with R, not only the main diagonal?<br />like:<br /> [,1] [,2]<br />[1,] 5.57 -0.7 ...<br />[2,] -0.7 2.86....<br />[3,] ..................<br /><br />thanks!Luna Mariahhttps://www.blogger.com/profile/10607519481118377057noreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-62912802621472936582012-07-30T00:52:19.985+02:002012-07-30T00:52:19.985+02:00Hi! I am interested in evaluate the statistical di...Hi! I am interested in evaluate the statistical distance to measeure the difference between two multivariate means by the Mahalanobis distance. I am following the paper: "Statistical assesment of mean differencies between two dissolution data sets". Yi Song, Drug Information Journal, 1996.<br /><br />I am struggling with the Multiple timer point dissolution. Any help could be really appreciate.<br />Thanks! ElbaAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-47735764542209705912012-05-31T11:13:20.127+02:002012-05-31T11:13:20.127+02:00I have change the headers to english. This is data...I have change the headers to english. This is data I have found in a video on Youtube with not other details.There are samples of fish giving theis age, weight, length and concentration of Lead in "ppm". I will add new exercices better documented in future posts.jrcuestahttps://www.blogger.com/profile/01637083082643255576noreply@blogger.comtag:blogger.com,1999:blog-2424328492215531658.post-4165333446904360652012-05-30T23:14:34.759+02:002012-05-30T23:14:34.759+02:00What is edad, long, peso, mg.kg ?
It would help t...What is edad, long, peso, mg.kg ?<br /><br />It would help to have just a basic understanding of what the data represents.Anonymousnoreply@blogger.com