search for: paleontolog

Hello Everyone, I would like to know if I can call one of the columns of a list, to use it as a variable in a function. Thanks in advance for any advice! Jana -- Jana Makedonska, B.Sc. Biology, Universite Paul Sabatier Toulouse III M.Sc. Paleontology, Paleobiology and Phylogeny, Universite de Montpellier II Ph.D. candidate in Physical Anthropology and Part-time lecturer Department of Anthropology College of Arts & Sciences State University of New York at Albany 1400 Washington Avenue 12222 Albany, NY Office phone: 518-442-4699 http://elect...

...an do this in photoshop or by some other softwares, but I think if I Can do this in R, that would be great! Would anyone please give me any hints? just hints, I will dig it out! Thanks a lot! Yingqi ******************** Yingqi ZHANG Beijing P.O. Box 643, China 100044 Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) Chinese Academy of Sciences Tel: +86-10-88369378 Fax: +86-10-68337001 Email: arvicolid at gmail.com

...certain dots being red and others black. I have all the pixel coordinates for the red dots, but I don't know how to draw the color on the device. Please help me! Sincerely yours, Yingqi ******************** Yingqi ZHANG Beijing P.O. Box 643, China 100044 Institute of Vertebrate Paleontology and Paleoanthropology (IVPP) Chinese Academy of Sciences Tel: +86-10-88369378 Fax: +86-10-68337001 Email: arvicolid at gmail.com

...I do not know how to specify a different line pattern for each ellipse. I can only modify the pattern for all ellipses with the "lty" argument. Any help will be highly appreciated. Thanks in advance! Jana -- Jana Makedonska, B.Sc. Biology, Universite Paul Sabatier Toulouse III M.Sc. Paleontology, Paleobiology and Phylogeny, Universite de Montpellier II Ph.D. candidate in Physical Anthropology and Part-time lecturer Department of Anthropology College of Arts & Sciences State University of New York at Albany 1400 Washington Avenue 12222 Albany, NY Office phone: 518-442-4699 http://elect...

I've been using the package rpart with R 1.3.0 for Windows to produce simple classification trees for some measurement data from paleontological specimens. Both the rpart documentation and the output confirm that the program produces splits on continuous data that leave "holes" in the data. It is probably of little practical importance, but is there a reason why the binary splits are constructed in the form (e.g): x7 &l...

...n.r-project.org/web/packages/stratigraph/index.html It includes tools for plotting pollen diagrams, an implementation of an evolutionary algorithm for drawing stratigraphic lines of correlation, and several other functions for the analysis and plotting of geological, biological, ecological, and paleontological data distributed through time or stratigraphic depth. There are still some problems with the windows binary, which will be resolved shortly, but a source install should work. Older versions, which have been privately circulated in the past year are available at http://www.bricol.net/strati...

...n.r-project.org/web/packages/stratigraph/index.html It includes tools for plotting pollen diagrams, an implementation of an evolutionary algorithm for drawing stratigraphic lines of correlation, and several other functions for the analysis and plotting of geological, biological, ecological, and paleontological data distributed through time or stratigraphic depth. There are still some problems with the windows binary, which will be resolved shortly, but a source install should work. Older versions, which have been privately circulated in the past year are available at http://www.bricol.net/strati...

Here's a question for ecologists on the r-help list-- I'm addressing this to ecologists in particular because they're most likely to be familiar with the equation in question but I'll be happy to discuss the problem with anyone who's willing to take a whack at it. I'm trying to write a function to calculate the large sample variance of species richness estimates by

...t?). Problem (a) leads to a commercial variant of the Signor-Lipps effect: "when x and/or y were available for purchase" is not the same as "the period for which data were recorded", thus inflating D, perhaps massively. Methods developed for handling the Signor-Lipps effect in paleontology can be used to estimate when x and y were available helping you to recover a more realistic N=A+B+C+D. I really should have published that. All of which is a long-winded way of saying that - Pearson correlations on binary columns can be computed very efficiently - the rows with x=0 and y=0 may b...

...Problem (a) leads to a commercial variant of the Signor-Lipps effect: "when x and/or y were available for purchase" is not the same as "the period for which data were recorded", thus inflating D, perhaps massively. Methods developed for handling the Signor-Lipps effect in paleontology can be used to estimate when x and y were available helping you to recover a more realistic N=A+B+C+D. I really should have published that. All of which is a long-winded way of saying that - Pearson correlations on binary columns can be computed very efficiently - the rows with x=0 and y=0...

...ommercial variant of the Signor-Lipps effect: "when x and/or y were > > available for purchase" is not the same as "the period for which data > > were recorded", thus inflating D, perhaps massively. Methods > > developed for handling the Signor-Lipps effect in paleontology can be > > used to estimate when x and y were available helping you to recover a > > more realistic N=A+B+C+D. I really should have published that. > > > > All of which is a long-winded way of saying that > > - Pearson correlations on binary columns can be computed v...

...ial variant of the Signor-Lipps effect: "when x and/or y were > > available for purchase" is not the same as "the period for which data > > were recorded", thus inflating D, perhaps massively. Methods > > developed for handling the Signor-Lipps effect in paleontology can be > > used to estimate when x and y were available helping you to recover a > > more realistic N=A+B+C+D. I really should have published that. > > > > All of which is a long-winded way of saying that > > - Pearson correlations on binary columns can be...

Let's go back to the original posting. > > > >> in each column, less than 10% values are 1, most of them are 0; > > > > > > > >> so I want to remove a row with value of zero in both columns when calculate correlation between two columns. > > So we're talking about correlations between binary variables. Suppose we have two 0-1-valued

...ratum for small units. The well known cumulative root frequency rule of Dalenius and Hodges and the geometric rule of Gunning and Horgan are also implemented. * stratigraph (0.61) Walton A. Green http://crantastic.org/packages/stratigraph A collection of tools for plotting and analyzing paleontological and geological data distributed through through time in stratigraphic cores or sections. Includes some miscellaneous functions for handling other kinds of palaeontological and paleoecological data. * survPresmooth (1.0) Ignacio Lopez-de-Ullibarri http://crantastic.org/packages/survPr...