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...ax vegetal 1 0.85 10 Astyanax aquatical_insect 1 0.05 11 Astyanax vegetal 1 0.90 12 Astyanax un_insect 1 0.85 for each specie, I have to calculate a food item importance index, that is: Fi x Vi / Sum (Fi x Vi) Fi = percentual frequency of occurrence of a food item Vi = percentual volume of a food item So, using ddply (plyr) function, I was able to calculate the total frequency of occurrence and total volume of each food item, using: Frequency = ddply (dieta, c('Specie','Fooditem') , summarise, Freque...

...uniform error that is scaled to be larger as x values also become larger #error is proportional to x size, this should cause heterocedasticity. #I know there are many methods to deal with heterocedasticity, but in my specific case, I want to use percent regression to minimize the mean absolute  #percentual error as opposed to regular regression that deals with the square of the errors. #Question, how to fit a linear model to minimize this error on the data y ~ x above? #Please do not use model<-lm(y ~ x....) as this will minimize the square of the errors, not the mean absolute percent error Be...

...not work for me. Here's my code: > library(fPortfolio) > >xmpPortfolio("\nStart: Load monthly data set of returns > ") > data(berndtInvest) > # Exclude Date, Market and Interest Rate columns from data frame, > # then multiply by 100 for percentual returns ... > berndtAssets = berndtInvest[, -c(1, 11, 18)] > rownames(berndtAssets) = berndtInvest[, 1] > head(berndtAssets) CITCRP CONED CONTIL DATGEN DEC DELTA GENMIL GERBER IBM MOBIL PANAM PSNH TANDY TEXACO 1-Jan-78 -0.115 -0.079 -0.129 -...

Hello all, I''ve been running Xen 2.0x for some few months and have written a simple top(1)-like tool - xenConsole - which continously displays all running domains, along with their CPU-consumption, load averages, percentual CPU-/memory-usage, domain uptimes and so forth. A screenshot probably explains it better than me: http://www.gothix.dk/xenConsole/xcon-0.10b1-ok.PNG It requires Perl, a Xen 2.0 setup and CPAN modules like POE, Curses::UI, and more. I''ve tested with Xen 2.07 and Debian Sarge as the Do...

Dear List, I'm trying to interpret the results of the Kruskal's Non-metric Multidimensional Scaling algorithm (isoMDS, MASS package). The 'goodness of fit' is reported as "The final stress achieved (in percent)". What does this mean exactly? I've tried to google for an answer but I've not come up with a definitive answer. Regards, Dieter -- Dieter Vanderelst

I have tried all I can think of to resolve a samba performance problem. Below is a description of the problem. The Red Hat server is actually a higher performance machine than the NT machine, though they are close in capabilities: > When I first installed 5.0 I notices slow samba performance. By slow I > mean around 80K/second doing a normal copy to the server from a Windows > 95

T.D.Lee@durham.ac.uk wrote: > > > But we'd like to go one step further and have the return code from preexec > be used to continue or abort the connection being established. The script > above would be modified to generate this return code. > > Looking through the source code (smbd/service.c), it doesn't seem to check > the return code (calling smbrun to do the