search for: hafner

I was wondering whether there exists a naming convention for row and column names in R data frames and matrices. E.g: PriceSwap or PRICESWAP or PRICE.SWAP Many thanks. Reinhold [[alternative HTML version deleted]]

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...rol chart constant 'd2', which is the expected range for a sample of size n from a standard normal. There is a fairly simple formula for the expected value of the range, given, e.g., in Kendall and Stuart (1969) The Advanced Theory of Statistics, vol. 1, Distribution Theory, 3rd ed. (Hafner, expression (14.82), sec. 14.25: The exact distribution of the range, p. 339). Unfortunately, either I don't understand this formula, or it's wrong. Using expression (14.1) in the same reference, I get the following: E(R) = n*integral{-Inf to Inf of [(F(x))**(n-1) - (1-F(x))**(n-1...

Hi, I am having trouble using the ave function with a POSIXct object. For example: x<-Sys.time()+0:9*3600 dat<-data.frame(id=rep(c('a',' b','c'),each=10),dt=rep(x,3),i=rep(1:10,3)) dat # This is what I want to do: dat$time.elapsed<-unsplit(lapply(split(dat$dt,dat$id),function(x) x-x[1]),f=dat$id) dat # The above code does the trick, but from the standpoint of

Hello, In my windows xp system the regional settings are set to German. However, I still would like to use the English version of R with English menu items and texts. RWinEdt tells me this is necessary in order to use the mdi framework. How can this be achieved with the 2.1 version. In 2.0.1 this wasn't a problem. Reinhold [[alternative HTML version deleted]]

...chart constant 'd2', which is the expected range for a sample of size n from a standard normal. There is a fairly simple formula for the expected value of the range, given, e.g., in Kendall and Stuart (1969) The Advanced Theory of Statistics, vol. 1, Distribution Theory, 3rd ed. (Hafner, expression (14.82), sec. 14.25: The exact distribution of the range, p. 339).: E(R) = integral{-Inf to Inf of [1 - (F(x))^n - (1-F(x))2] dx. Thanks, Spencer Graves

...rol chart constant 'd2', which is the expected range for a sample of size n from a standard normal. There is a fairly simple formula for the expected value of the range, given, e.g., in Kendall and Stuart (1969) The Advanced Theory of Statistics, vol. 1, Distribution Theory, 3rd ed. (Hafner, expression (14.82), sec. 14.25: The exact distribution of the range, p. 339). Unfortunately, either I don't understand this formula, or it's wrong. Using expression (14.1) in the same reference, I get the following: E(R) = n*integral{-Inf to Inf of x*[(F(x))**(n-1) - (1-F(x))**(n-1)...

...riable turnover. Let's suppose my tree for turnover has 30 leaves and I want to have 30 datasets with dataset 1 containing the turnover values of the units in leaf 1, dataset 2 containing turnover values for the observations in leaf 2 and so on. How can I do this? Best regards, Hans-Peter Hafner

...ted book. So I would be glad, if someone could help me. If it isn't possible: Which package / which function can I use instead? I'm rather new to R, so I don't have much knowledge about writing programs and it would be nice, if there exists an easy to use package. Thanks! Hans-Peter Hafner

Dear xen-users, in the last two days, two different domUs on two different dom0s had suddenly corrupted filesystems which let to total data loss on both domUs. I have never suffered under this failure before and I guess it is related to XEN. Both domUs were running for long time without any problems and I am pretty sure, that the hard drives are fine (checked with smart checks).