search for: watersh

Hello, Is R very compatible with a Mac? A colleague of mine indicated that everyone he knows with a Mac has problems with R. What can you tell me about using R with a Mac. What do I need to download? I have downloaded the basic R package. Thanks, -- Tiffany Kinder MS Student Department of Watershed Science Utah State University tiffany.kinder@aggiemail.usu.edu [[alternative HTML version deleted]]

...drologist, but not a professional statistician. Yet I find myself using statistical tools at least part of the time. My discovery of the R-project through a friend has been most helpful. Here is my problem: I'm tasked with fitting a dataset comprising correlated discharges from adjacent watersheds to bivariate normal and bivariate Gumbel distributions (data untransformed and then log-transformed to reduce skew). (In addition, I'm tasked with exploring a couple of Archimedian copulas to link univariate Pearson Type III distributions fit to log- transformed discharges, but that...

...h of year) of the list psd. The only way I can figure out how to do this is to manually copy the table into Excel, reformat, and then export that back out as a new csv. There has to be a better way? Gregory A. Graves Lead Scientist REstoration COoordination and VERification (RECOVER) Watershed Division South Florida Water Management District Phones: DESK: 561 / 682 - 2429 CELL: 561 / 719 - 8157 [[alternative HTML version deleted]]

...) year.text=c("2001","2002","2003","2004", "2005", "2006", "2007","2008", "2009") axis(1, at=c(1:9),labels=year.text) Gregory A. Graves Lead Scientist REstoration COoordination and VERification (RECOVER) Watershed Division South Florida Water Management District Phones: DESK: 561 / 682 - 2429 CELL: 561 / 719 - 8157

...ther statistical techniques available in R that test the equality of means when homoscedastisity is violated? 't.test' does this in the pairwise sense when var.equal = TRUE. With best wishes and kind regards I am Sincerely, Corey A. Moffet Support Scientist University of Idaho Northwest Watershed Research Center 800 Park Blvd, Plaza IV, Suite 105 Boise, ID 83712-7716 (208) 422-0718

...ans for that." I have developed some applications in R that I would like to make available through a web interface using CGIwithR but at this time I am a Windows user. Any suggestions? With best wishes and kind regards I am Sincerely, Corey A. Moffet Rangeland Scientist USDA-ARS Northwest Watershed Research Center 800 Park Blvd, Plaza IV, Suite 105 Boise, ID 83712-7716 Voice: (208) 422-0718 FAX: (208) 334-1502

...rn and Applied Statistics with S and from other sources, but I still can't figure it out. I am trying to estimate species richness (sr) in streams across minnesota. My predictor variables are depth (d), habitat diversity (habdiv), drainage area (da) and an indicator variable representing the watershed/basins that the streams are in (bas: there are 10 watersheds). The variable explaining the greatest amount of variation appears to be da. I have used a log(da) to linearize the relationship, but an asymptotic relationship is more appropriate. I have used nls: B<-c(.007,1,3,2,2,2,2,2,2,2,2,2...

...e the 1-12 with monthname using ticks.lab. What am I doing wrong? plot(flow~factor(month),xlab="Month",ylab="Total Flow per Month", ylim=c(0,55000), ticks.lab="monthname") Thanks Gregory A. Graves Lead Scientist REstoration COoordination and VERification (RECOVER) Watershed Division South Florida Water Management District Phones: DESK: 561 / 682 - 2429 CELL: 561 / 719 - 8157

I'm using R 1.6.2 on a Windows 2000 machine. I've plotted the results of an MDS run labeled by a numerical ID, and color coded by a group code: plot(cv.mds.spr$points, type="n", main="Non-Metric Multidimensional Scaling of SprRun CV Watersheds") text(cv.mds.spr$points, labels = as.character(cv.wshed.id.spr), col = codes(cv.wshed.grp), cex=.75) Question is, how do I get the legend to match the color codes? I have tried different permutations of the following: leg.txt <- c("LSSJ.NS","LSSJ.SS","US.RD&q...

...an",span = .2, ylim=c(l,h), type='n', lwd=2, color="red", ylab="Stage, feet", xlab="Week of Year") #loess, lower span makes more irregular par(new=F) Gregory A. Graves Lead Scientist Everglades REstoration COoordination and VERification (RECOVER) Watershed Division South Florida Water Management District Phones: DESK: 561 / 682 - 2429 CELL: 561 / 719 - 8157 [[alternative HTML version deleted]]

...4/help/08/01/0686.html http://tolstoy.newcastle.edu.au/R/e2/help/07/06/19095.html I do not need a response, unless there is a preventative measure, but thought I would bring this to your attention. Thank you, Toby Toby Gass Graduate Degree Program in Ecology Department of Forest, Rangeland, and Watershed Stewardship Warner College of Natural Resources Colorado State University Fort Collins, CO 80523

...2 Mar value value value and so on. I'd appreciate some code that would help accomplish this. Since I'm not an R expert, code that is somewhat transparent might be more helpful to me than the shortest possible option. Thank you. Toby Gass Department of Forest, Rangeland, and Watershed Stewardship Warner College of Natural Resources Colorado State University Fort Collins, CO 80523 Phone: 970-491-7257

Dear exports,I have created a hypsometric curve (area-elevation curve) for my watershed by using simple command hypsometric(X,main="Hypsometric Curve", xlab="Relative Area above Elevation, (a/A)", ylab="Relative Elevation, (h/H)", col="blue")It plots the hypsometric curve in "RGraphics window", My question is how can I export value...

...gainst date, is to export the tapply output as a csv, and then reimport. Suggestions? I couldn't find a solution to this likely SIMPLE problem in Crawley or multiple searches of R help. Gregory A. Graves, Lead Scientist Everglades REstoration COoordination and VERification (RECOVER) Wetland Watershed Sciences / Restoration Sciences Department South Florida Water Management District Phones:? DESK: 561 / 682 - 2429 ?????????? ?? CELL:? 561 / 719 - 8157

The USDA-Agricultural Research Service, Southeast Watershed Research Unit in Tifton, GA, is seeking a postdoctoral research associate for a full-time, 2 year appointment. The research associate will develop, calibrate, and validate a semi-empirical model for estimating cotton biomass from fields within the southeastern United States. Model development wil...

...ameters: When I execute the following and do a plotarc() or look at the lists containing the x and y coordinates, all I see is garbage--the coordinates are all infinitesimal or extremely large numbers (e.g., -8.928678e-31, 9.784083e+15). stdir6 <- get.arcdata("/projects/cold_creek/grid/watershed/dhsvm_200m", "stdir_6", filename="arc.adf") plotarc(stdir6, new=T) stdir6[[2]] On the advice of Virgilio, I converted my Arc v.8x coverage into v.7x, but that made no difference (ESRI documenation says they should be the same anyway). Scott Waichler Pacific Northwest...

...R-help, Does any one know of a function/package in R that will test the assumption of spericity in a split-plot analysis of variance? How are people dealing with this issue in R? With best wishes and kind regards I am Sincerely, Corey A. Moffet Support Scientist University of Idaho Northwest Watershed Research Center 800 Park Blvd, Plaza IV, Suite 105 Boise, ID 83712-7716 (208) 422-0718

The funciton c() works differently for strings and for factors: For strings: > l = c('a', 'b') > l [1] "a" "b" For factors: > l = c(factor('a'), factor('b')) > l [1] 1 1 What should be the right technique for merging factors? -- Svetlana Eden Biostatistician II School of Medicine

Dear R-users, I've spent most of the day reading R documentation at length but couldn't find something perhaps obvious. I have a dataset made of 3 morphometric variables for a series of watershed [log(slope); log(drainage_area); distance_to_outlet] My aim is to predict the value of log(slope) for pairs of [drainage_area; distance_to_outlet] (sounds like a plain linear model fitting, right, nothing too fancy there). In the literature, the standard procedure is to reduce the number of obse...

...Can I model the dependence among residuals with in group (bas) and along area? Can the corCAR1 be used and the area used as a position variable? If so does the position variable need to be sorted when using the corCAR1 structure? Or could one use spatial classes and use area as one position and watershed as the other substituting numbers for the grouping variable? I have been trying, but R keeps crashing when I specify correlation structures other than compound symmetry. I assume this is because I am not specifying the form correctly. Any suggestions would be appreciated. Dan