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Is there a way to get panel.grid to put the grid lines at specific locations? It would be nice to have them correspond to selected tick marks. Thanks, Carlisle -- William Carlisle Thacker Atlantic Oceanographic and Meteorological Laboratory 4301 Rickenbacker...

Hello all, My first try with the fields library's Tsp function, trying to imitate the ozone example with my data, has resulted in the following error message: > fit <- Tps(as.matrix(all.60[,5:6]),as.vector(all.60...

Dear R listers, When using smooth.spline to interpolate data, results are generally good. However, some cases produce totally unreasonable results. The data are values of pressure, temperature, and salinity from a probe that is lowered into the ocean, and...

"Liaw, Andy" wrote: > > I looked at rqss() in nprq, as Prof. Koenker suggested, but that doesn't > have a predict() method, so I don't know how you'd get the smooth at values > other than the observed... > > The criteria...

When plotting box & whisker plots to show the distributions of residuals of several models, it would be useful to add a vertical line to indicate zero residuals. By adding an explicit panel function that includes panel.abline and panel.bwplot...

Dear R experts, I would greatly appreciate your help with R's hypertext online documentation, which I can pass on to our system manager. We are running version 1.7 on sparc-sun-solaris2.9 using netscape7 browser for displaying...

roger koenker wrote: > > If one repeats the experiments in Craven and Wahba, the paper that > "invented" GCV you find, or at least I found, when I tried to do this > some years ago, that GCV in about 10% > of cases...

Andy, As the data are often noisy, smoothing splines should be appropriate. The first example profile shows an isothermal (constant temperature) layer in the upper ocean followed by a sharp thermocline (large temperature gradient), but there are relatively few observations...

The University of Miami's Rosenstiel School of Marine and Atmospheric Sciences (RSMAS) is seeking a research associate to work with hydrographic data. The objective of the project is to develop statistical models for estimating salinity and density from observations...

The University of Miami's Rosenstiel School of Marine and Atmospheric Sciences (RSMAS) is seeking a research associate to work with hydrographic data. The objective of the project is to develop statistical models for estimating salinity and density from observations...

Mike, If depth is positive downward, you can simply plot its negative. Fir example, suppose you have a dataframe with ctd data: > ctd[1,] id p t s 104613 5993512 2 25.248 36.238 > unique(ctd$id) [1] 5993512...

"Liaw, Andy" wrote: Andy, Is it known that smooth.spline() has a problem handling sharp jumps? That is part of the question. It seems to work fine for some sharp jumps, but I have not yet been able to determine...

Can someone point me to the appropriate functions for fitting multiple statistical models that are coupled to each other. The data are measurements of salinity s and temperature t at stations id and pressures at p as well as surface...

Dear Prof. Ripley, I'm not sure what you are asking. Prof Brian Ripley wrote: > > Can we distinguish > > smooth.spline() with a fixed penalty lambda. > > smooth.spline() with a particular smoothing selector, e.g. GCV (the > default). > > I doubt if...

Sorry. Didn't realize about attachments. Here are the data for four profiles that had problems with smooth.spline(): id p t s 3322643 0.0 23.26 35.490 3322643 42.0 23.26 35.500 3322643 44.0...