similar to: Chi square convolution?

Displaying 20 results from an estimated 100 matches similar to: "Chi square convolution?"

2005 Mar 09
2
Question about biasing in sd()???
Hi, Can anyone help me with the following. I have been using R for Monte Carlo simulations and got some results I couldn't explain. Therefor I performed following short test: -------------- mean.sds <- NULL sample.sizes <- 3:30 for(N in sample.sizes){ dum <- NULL for(I in 1:5000){ x <- rnorm(N,0,1) dum <- c(dum,sd(x)) } mean.sds<- c(mean.sds,mean(dum)) }
2005 Mar 23
3
Question on statistics
Hi, Can anyone help me with the following (although not directly correlated to R functionality)? I have been looking on the internet but can not find the answer. My question: what is the variation on the mean of a limited distribution (total N points normally distributed), when I have a small sample of that distribution (n < N)? Your help would be very welcome. Thanx, Roy -- The
2003 Aug 11
2
default directory RGui for windows NT
Hello, Can anyone tell me how to change the default directory in RGui for windows NT? Thanx, Roy
2009 Feb 12
4
Multiple caller id ...
If I have the following in the dialplan exten => foo,n,Dial(SIP/1234&Zap/G1c/55443322) and SIP/5432 calls this extension, is it possible to show different callerid numbers to each of the target numbers ? The reason I ask is that if the call is from an internal sip phone, I want to show the internal callerid (5432) to the SIP phone on 1234, and the DDI of the 5432 extension
2005 May 28
1
cmd curl crashes asterisk:
I recently began using the curl cmd to do an external callerid lookup on my own customer database. I've noticed certain lookups will cause a crash and not show anything in the messages file or the console. The curl command is connecting to an external webserver which has a oracle db connection. The file its hitting is PHP and does a very simply lookup showing the text like "C1234 Bobs
2005 Feb 01
3
Zap channel occasionally misses dialing the first digit
....I THINK. When dialing 1+10 digits, I occasionally get a telco message "You must first dial a 1....". When I look at the console, the number is being sent to the ZAP channel properly. We're talking about a couple of POTS lines on a TDM400P. I'm thinking that it may be starting the dial too early after coming off-hook because I can just redial and have it work (or not)
2009 Mar 29
1
[LLVMdev] GSoC 2009 application
On Mon, Mar 30, 2009 at 1:05 AM, Eli Friedman <eli.friedman at gmail.com> wrote: > On Sun, Mar 29, 2009 at 3:33 PM, Benoit Boissinot > <bboissin+llvm at gmail.com> wrote: >> While it is not described in the litterature, I don't think you need >> to introduce a new >> function: >>      x0 = ... >>  x1, x2 = \sigma (x0) >>         | >>
2006 May 09
1
trying to use standard notation
Hi, all. In setting up my package for post-processing regression models, I am trying to use standard notation as much as possible: thus, I use coef() to access estimated coefficients. I wrote a function called se.coef() to grab standard errors, and se.fixef() and se.ranef() to grab se's from coefficients estimated from lmer(). I also need a function to access sigma-hat (the residual sd
2000 Jan 28
0
convolution bug (PR#408)
Full_Name: Bill Simpson Version: 65.1 , 0.90.1 OS: Linux Submission from: (NULL) (193.62.250.209) I reported this on r-help, but here is official bug report. The present convolve() does not do convolution by default. Its default behaviour is correlation. This is a bug. The default argument conj should be set to FALSE. The zero-padding should be on the right for linear convolution (don't
2001 Jun 04
1
2D convolution
Dear all, I have an image that I need to filter, and so I'm looking for a method to convolve it with a matrix. If I understood the docs for convolve correctly, it only works in 1D (and I have tried to convolve, it didn't look good). So, I wondered if anybody have implemented 2D convolution in R, or have any good advices to share (beyond having a look at mvfft), before I go hacking?
2005 Feb 15
1
convolution of functions
Dear sir, we would like to know if there exist any R package containing the computational performance of the n-fold Stieljes' convolution of functions. We look forward to hearing from you. Thank you in advance. ____________________________________ M.Luz G?miz P?rez Dpt. Estad?stica e Investigaci?n Operativa Facultad de Ciencias Universidad de Granada Telf.: 958-243156 e-mail:
2011 Feb 26
1
2D Convolution Function
Dear R-Helpers, I want to try the 2D (two-dimensional) convolution in R. For example, let us we have the following kernel and data. kernel <- (1,2,3,2,1) data <- array(1:100, dim=c(10,10)) I know the function 'convolve' only for one-dimensional convolution, but it is just for a 1D sequence. Is there any function for 2D convolution? For theory, please refer to the following link:
2011 May 18
1
Convolution confusion:
Hi, I'm new to R, and I'm a bit confused with the "convolve()" function. If I do: x<-c(1, 2, 3) convolve(x, rev(x), TRUE, "open") = 9 12 10 4 1 But I expected: 3 8 14 8 3 (like in Octave/MATLAB - conv(x, reverse(x)) ) 3 2 1 x 1 2 3 = 3 2 1 0 6 4 2 0 0 9 6 3 = 3 8 14 8 3 The thing is, that "convolve(x, x, TRUE, "open")" works. For me
2010 Jun 04
2
Convolution vector to be derived
I want to generate the following outcome using convolution of two sequences. x <- c(1,2,3,4,5) y <- c(6,7,8,9) The resulting convolution vector is 6 19 40 70 100 94 76 45 When using convolve(), it is hard to produce the result above. Would you help me out to get that? Best regards Moohwan Kim
2005 Sep 29
2
solution of convolution equation
Hello, May be somebody can help me... I am trying to find a solution of a convolution equation using fft (and unfortunately I do not have a good background for this). So I am just trying to figure out how it can be implemented in R. I have two multidimensional independent variables X and Z and I know their densities fx and fz, which are multidimensional arrays. So I have to find the density of
2005 Dec 23
2
convolution of the double exponential distribution
Is there any R function that computes the convolution of the double exponential distribution? If not, is there a good way to integrate ((q+x)^n)*exp(-2x) over x from 0 to Inf for any value of q and for any positive integer n? I need to perform the integration within a function with q and n as arguments. The function integrate() is giving me this message: "evaluation of function gave a
2006 Feb 07
1
How to hide the file name listings, but still see the stats?
I'm using rsync 2.6.6 to transfer some directories with the following invocation rsync -az --delete --ignore-errors --stats -e rsh I would expect to get ONLY the --stats output from this invocation. If I add one or more -v flags, I would expect to see the files listed. However, the files (and the deleted files) appear no matter what. If I add -q, I don't see the files, but I don't
2006 Feb 08
1
Directory matching for hidden directories
I'm seeing the following behavior: - lib/ Excludes any directory named lib - .hidden/ Appears to be ignored; .hidden and all sub-folders are transferred/deleted - .hidden** Excludes any directory named .hidden. From my reading of the "FILTER RULES" section, I would expect the last two options to be equivalent. Note that I'm doing this all with -n; I haven't done the
2004 Sep 22
0
Address expired
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2005 Jan 19
0
what does the "c" option in the zap phone number do
I was browsing the dial cmd page on the wiki, and followed up to the zap channels page. There are a couple of interesting (ok, so I'm a saddo) options, specifically the "w" (wait .5 seconds before dialling the next digit) and the "c" option (You may also use the special modifier *c* to allow for clear channel connections between PRI ports) What does the "c"