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>Message: 41 >Date: Sun, 08 Jan 2006 13:52:33 +1100 > From: paul sorenson <sourceforge@metrak.com> >Subject: Re: [R] Wikis etc. >To: Frank E Harrell Jr <f.harrell@vanderbilt.edu>, r-help > <r-help@stat.math.ethz.ch> >Message-ID: <43C07E71.3040303@metrak.com> >Content-Type: text/plain; charset=ISO-8859-1; format=flowed > >Frank E Harrell Jr wrote: &...

I am trying to replace a spreadsheet model of a project justification with an R script. I can't seem to track down R functions to calculate Internal Rate of Return and NPV? Am I missing something? NPV doesn't seem so difficult to calculate (at least for a regular series) but I am struggling to identify how to solve for IRR in R. It would be sufficient if it worked for a regular

I have some time stamped events that are supposed to be unrelated. I have plotted them and that assumption does not appear to be valid. http://metrak.com/tmp/sevents.png is a plot showing three sets of events over time. For the purpose of this exercise, the Y value is irrelevant. The series are not sampled at the same time and are not equispaced (just events in a log file). The plot is already pretty convincing but requires a human-in-the...

What is the recommended way to convert/coerce and integer to a POSIXct please? d <- as.POSIXct(Sys.Date()) i <- as.integer(d) as.POSIXct(i) Error in as.POSIXct.default(i) : do not know how to convert 'i' to class "POSIXlt" This appears to be the behaviour in 2.3.1 and 2.4.0 on windows XP. I have tried searching on this and found as.Date.integer in package zoo which

I have some data in a CSV file: time,pos,t,tl 15:23:44:350,M1_01,4511,1127 15:23:44:350,M1_02,4514,1128 15:23:44:350,M1_03,4503,1125 ... 15:23:44:491,M2_01,4500,1125 15:23:44:491,M2_02,4496,1124 15:23:44:491,M2_03,4516,1129 ... 15:23:44:710,M3_01,4504,1126 15:23:44:710,M3_02,4516,1129 15:23:44:710,M3_03,4498,1124 ... Each pos (eg M1_01) is an independent time series. I would like to plot each

I am using R in Windows. I see that I will have to use batch processes with R. I will have to read and write text files, and run some R code; probably some external code too. I have never done scripting. Is there any document that explains simple steps with examples? I also have heard that Python is a good scripting language. Is it worth the effort? (I do not have too much free time, so if I could

With dates I get different results with 2.2.1 and 2.3.1. From my somewhat naive point point of view, the 2.2.1 behaviour seems more sensible. Running the code below in 2.2.1: V1 2006-08-01 2006-08-01 1 1 With 2.3.1 I get: V1 1154354400 1154440800 1 1 # testdate.R t <- read.csv2('testdate.csv', header=FALSE) t$V1 <- as.POSIXct(t$V1)

I guess this isn't so much of a help request as a show-and-tell from a non-statistician homebrewer who has been fumbling around with R. If nothing else it provides yet another data set. I hope it is not out of line. Anyway, the plots I have produced are at http://brewiki.org/BatchSparge#poll The polling method is somewhat simple, its just one of those multiple choice style polls you

I created a tex file following the example in the Sweave help which produced the following files in my working directory. Sweave-test-1-006.eps Sweave-test-1-006.pdf Sweave-test-1-007.eps Sweave-test-1-007.pdf Sweave-test-1.tex When I run latex on this, I get a latex error, log file below. I am running R 2.1.1 on Windows XP. I have installed "small MiKTeX" and I have added