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Please disregard my message I've seen the light now... curve(predict(out, data.frame(x = x)), add = T) Thanks, Jose -- Jose A. Hernandez Department of Soil, Water, and Climate University of Minnesota 1991 Upper Buford Circle St. Paul, MN...

"Assistant professor in spatial data quality and statistics" at the International Institute for Geo-Information Science and Earth Observation <http://www.itc.nl>. For the job description, deadline, requisites and contacts, please visit: http://www.pedometrics.org/jobs.asp?id...

I think the easiest way is using na.omit function which omits pairs of data Look at the following example: > x <- c(0,1,2,3,4,5) > y <- c(NA,2, 3, 5, NA, 6) > data.1 <- data.frame...

Dear R colleagues, My name is Jose Hernandez and work in the analysis of on-farm experiments. I've been a R user for sometime now, however am still struggling figuring out some of my spatial analysis using R. Most...

Postdoctoral Research Fellow Job description: ?Methods of spatio-temporal analysis of landscape variability? The position is to be filled as soon as possible. The successful applicant will develop new methods for analysing spatio-temporal variability in agricultural landscapes and apply...

Hello all, I am an R novice and I have a simple question and hope somebody can help me out. I need to place several labels in a plot, this labels are some kind of text and also some objects...

Folks, This is so simple is driving me crazy. It's not really an R question is more an Statistics question. I applied a chemical in 3 different events during a growing season. I took 3 samples in each event...

Dear R community, I am using xYplot() from the Hmisc package. The package works great to plot means + CI. But I am having issues handling the scales. I am plotting "Soil Clay content" vs "Soil depth" by "land use". Usually...

Hi Neela, Just my ??2 regarding the R vs. SAS issue. I started to use SAS since my undergraduate studies in 1993, and I am now a migrating to R user, and I hope not to ever go back to...

Dear zhijie, zhijie zhang wrote: > Dear firends, > I have two questions about spatial statistics: > 1. As we all know ,we can calculate Moran's I to evaluate the spatial > autocorrelation and we can also visually assess the spatial autocorrelation > through...

R-community, Assuming a file with 3 columns: site, nrate, yield. In SAS I can easily run the analysis BY SITE using the following code: *--------------------------------------------------*; proc nlin method=MARQUARDT; by farm; parms b0=100 b1=0.33 b2=-0.00111...

Hi Naren, If understand your problem correctly, all you have to do is to remove your trend by using linear regression. Assuming you have geostatiscal data (point observations of a continuously varying quantity over a region), then you want to...

Dear R colleagues: Am trying to fit a simple NL model to determine Economical Optimum Nitrogen Rates. The segmented (quadratic + plateau) model only works with some y's, in some cases I get a "singular gradient" error. I'll appreciate...

Good day R-ers! I was running the basic statistics for the exam that my students took last week and something does not make sense with the stem() fucntion. Here are two of my variables: time, is time to complete...

Dear R community, once again I request your generous help on an R issue I cannot seem to figure out. I am trying to do some analysis for multiple sites, in my example I am using only two, but the...