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...lt;- formula(contraceptive_method_used ~ wifes_education + husbands_occupation) # The thing I want is a programatic way to extract 'shortform' from 'z' # Examples of use of 'shortfom' loglm(shortform, data = ContraceptiveChoice) Thanks in advance Christiaan -- Christiaan Pauw Nova Institute www.nova.org.za

HI Everybody Does anyone know of documentation about different ways of obtaining user input in R. I have used readline() but I wondered is there are sophisticated packages that does things like validate answers or generate selection lists. bets regards Christaan [[alternative HTML version deleted]]

Hallo Everybody Consider the following vector a=1:10 b=20:30 c=40:50 x=c(a,b,c) I need a function that can tell me that there are three set of continuos sequences and that the first is from 1:10, the second from 20:30 and the third from 40:50. In other words: a,b, and c. regards Christiaan [[alternative HTML version deleted]]

...################### This is where the trouble starts: What do I do if I need to pass the argument base.conc=10 or a different option for par= to dose.response() ? At the moment it works becuase it uses the default, which will not be valid in all cases. Thanks in advance Christiaan -- Christiaan Pauw Nova Institute www.nova.org.za

Hi everybody. I want to identify not only duplicate number but also the original number that has been duplicated. Example: x=c(1,2,3,4,4,5,6,7,8,9) y=duplicated(x) rbind(x,y) gives: [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] x 1 2 3 4 4 5 6 7 8 9 y 0 0 0 0 1 0 0 0 0 0 i.e. the second 4 [,5] is a duplicate. What I want is

Hi everybody I am a recent convert from SAS so please excuse me if this is all very obvious: I want to use the runs test {runs.test() in package tseries} to test the randomness of a certain variable in a survey for each interviewer. I tried to us the by() statement but it doesn't seem to work with runs.test() as the function. Here is what I have: Consider a data frame with two variables and

Hi everybody. I have a dataframe that contains a factor with the date information in the format like in the example below: "2009/05/12 11:22:31 AM" I have been able to convert it to POSIXt using strptime Now I want to print only the date as one vector and the time in another vector but they must be real date and time classes so that i can use them in calculations to reconstruct my

Hi Everybody I need to "transport" some data and results to use another application (Sweave via LyX - where debugging is very difficult) in order to build a report. Is it possible to store a collection of variables of different types (like named integers, matricies, data frames and two lists) all in one list and save it and then simply load it again later and "unpack" the

Hi Everybody Is there a way in which one can use the RPostgreSQL package to take a sample from a table in Postgres database without having to read the whole table into R regards Christiaan [[alternative HTML version deleted]]

Hi Everybody In R, the XLConnect package can read and write named region to and from Excel. In order to read a named region with the readNamedRegion function you need to know it's name. You can check is a name exists with existsName, but you still have to know the name. Is there a way to actually get a list of the named regions in XLConnect sinilar to getRanges in the xlsx package. On that

...ying to install RPsSQL and get the following error message: When I do ./configure form the untarred source directory I get loading cache ./config.cache checking for crypt in -lcrypt... no No crypt function found When I use the Package installer in R I get install.packages("/Users/christiaanpauw/tmp/RPgSQL/", , NULL, type = "source") Warning in install.packages("/Users/christiaanpauw/tmp/RPgSQL/", , NULL, : argument 'lib' is missing: using '/Users/christiaanpauw/Library/R/2.8/library' * Installing *source* package 'RPgSQL' ... creating ca...

Hi Everybody I use R2.8.0 on Mac OS X. I set up LyX 1.6.1 to use Sweave today. I can compile the test file I found on CRAN ( http://cran.r-project.org/contrib/extra/lyx/) without a problem and the output looks very nice. In the test file the following R code is used. <<myFirstChunkInLyX>>= xObs <- 100; xMean <- 10; xVar <- 9 x <- rnorm(n=xObs, mean=xMean, sd=sqrt(xVar))

Hi everybody Im on R version 2.11.1 on Mac OS X I am working through David Kahle's example of using ggplot2 with Rgooglemaps (found here: https://github.com/hadley/ggplot2/wiki/Crime-in-Downtown-Houston,-Texas-:-Combining-ggplot2-and-Google-Maps). Excellent page by the way. I have downloaded the data and the code and want to learn how to do this by first simulating David's results and

Hi everyone (Pardon the incorrect terminology of my previous post: "vertical line...). I have created a function that uses xtable to print table of frequencies and percentages with a heading and some sample information (the sample size and missing values). The function and example data is below. I want a horisontal line that separates the results from the sample information i.e. a

Hi everyone I want to apply a function by two indices. I have a number of surveyors submitting questionnaires. I want to check the time of the first submission for the day for each surveyor and also see a NA is no submission was done on a particular day. This generates a sample of the data:

Hi Everybody I need to create a lot of frequency tables with frequencies and percentages (and cumilative freq and % as well) for a report. freq() in prettyR give more or less what I need. I am trying to export the result of freq() to html but the html doesn't look look the console output. See the following example library(prettyR) library(Hmisc) x <- matrix(sample(1:3, 12,

Hi everybody I have a large number of Excel speadsheets that I want to merge into one R dataframe to process. I can read them one by one with read.xls but I really need a function to read a whole directory at once and merge the columns with the same name into a single dataframe. here is what I have thus far (on Mac OS X 10.5.2. for R 2.8.0): # Define the directory where the data is

Dear all, I would like to search in a string for the second occurrence of a symbol and replace the symbol after it For example my strings look like sta_+1+0_field2ndtry_0000$01.cfg I want to find the digit that comes after the second +, in that case is zero and then over a loop create the strings below sta_+1+0_field2ndtry_0000$01.cfg sta_+1+1_field2ndtry_0000$01.cfg

Hi Everybody I want to print a latex table containing math characters in the column heading These are the formulae I want to use as column headings. It prints OK from TeX $\sum_{i}\sum_{j}C_{P,i,j,y}\times\mathit{FC}_{i}$, $XU_{alt,y}$, $n$, $\bar{C}_{P,y}$ My plan was to create a character vector with these and later rbind the values to them. When I create the vector like:

Hallo Everyone I have the kind of problem that one should never have because one must always plan well and communicate with your team. But now I haven't so here is my problem. I have data coming in on a daily basis from surveys in 10 towns. The questionnaire has 62 variables but some of the regions have used older versions of the questionnaire that have a few variables less. I want to combine