search for: dmst

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2006 Mar 28
2
Skewed t distribution
...tick to the sn package. On subsamples of the entire population that I deal with, everything is fine. However, on the total sample (difference in cross-sectional dimension: 30 vs 240) things go wrong - the objective function diverges to infinity. I located the "rotten" line to be t1 <- dmst(vector, mu, P, alpha, nu) where "vector" is the matrix row, on which I evaluate my likelihood and the rest in parametrized in a standard way, just as the help pages give it. In large dimensions, I get a zero value of the density (which is probably due to numerical issues). I tried the fo...
2009 Sep 23
1
Maximum Likelihood Est. regarding the degree of freedom of a multivariate skew-t copula
...on(v) { df<-v[1] for(i in 1:length(P_dax)) { f <- function(z) { pmst(z, xi[1],Omega[1,1],alpha[1],df)-P_dax[i] } u1[i]<-uniroot(f,ber1,tol=0.000001)$root f <- function(z) { pmst(z, xi[2],Omega[2,2],alpha[2],df)-P_nik[i] } u2[i]<-uniroot(f,ber2,tol=0.000001)$root z?hler<-dmst(c(u1[i],u2[i]),xi,Omega,alpha,df)[1] nenner<-dmst(u1[i], xi[1] ,Omega,alpha[1],df) * dmst(u2[i], xi[2],Omega,alpha[2],df) z[i]<-z?hler/nenner } lnc<-log(z) erg<-(-1)*sum(lnc) return(erg) } v<-c(10) optim(v,c_density, method="SANN", control=list(maxit=20))...
2003 Sep 05
3
fit data with skew t distribution
Hi, Is there a function in R that I can use to fit the data with skew t distribution? Speaking in detail, I first used the kernel density estimation to fit my data, then I drew the skew t using my specified location, scale, shape, and df to make it close to the kernel density. Now I want to get the parameter estimations of the skew t which give me the closet density to the kernel density.
2015 Sep 18
2
file names format for c32 files
...at for c32 files > instead of such a long file name. Example of such a long file name? So we know which file name to surpress into 8.3. ( yes, CP/M file name convention legacy is still present ) > If possible, also use short names for source files too. TIA. Euh, please visit http://www.dmst.aueb.gr/dds/pubs/conf/2015-MSR-Unix-History/html/Spi15c.html scroll down to '4 Data Uses', check the graphic, especial file name length. My point: _Why_ restrict the development system file name length? And now something completely different: > > _________________________________...
2005 Feb 24
1
Density of the Multivariate T Distribution
Hi, I am looking for an efficient way to compute the values of the density function of a multivariate T distribution - something like "dmvnorm", but for T distr. Does this exist somewhere? Many thanks, Jan Bulla Goettingen University
2015 Sep 18
1
file names format for c32 files
...name? >> >> So we know which file name to surpress into 8.3. >> ( yes, CP/M file name convention legacy is still present ) >> >> >> >>> If possible, also use short names for source files too. TIA. >> >> Euh, please visit http://www.dmst.aueb.gr/dds/pubs/conf/2015-MSR-Unix-History/html/Spi15c.html >> scroll down to '4 Data Uses', check the graphic, especial file name length. >> >> My point: _Why_ restrict the development system file name length? >> > > Hehe, OK, I'll bite :). >...
2006 Jun 02
1
Multivariate skew-t cdf
Dear All, I am using the pmst function from the sn package (version 0.4-0). After inserting the example from the help page, I get non-trivial answers, so everything is fine. However, when I try to extend it to higher dimension: xi <- alpha <- x <- rep(0,27) Omega <- diag(0,27) p1 <- pmst(x, xi, Omega, alpha, df = 5) I get the following result: >p1 [1] 0 attr(,"error")
2015 Sep 18
3
Pxechn.C32 working under Uefi
Hello I'm currently working on a project to rolling out a new TFTP boot server, for a fairly large infrastructure (>200 servers, >1500 clients, with heterogeneous configurations/setups). We are using Syslinux version 6.03 for all the function within our TFTP server. We are using Ubuntu as our main TFTP server for most deployments and WDS for our
2015 Sep 18
0
file names format for c32 files
.... > > Example of such a long file name? > > So we know which file name to surpress into 8.3. > ( yes, CP/M file name convention legacy is still present ) > > > > > If possible, also use short names for source files too. TIA. > > Euh, please visit http://www.dmst.aueb.gr/dds/pubs/conf/2015-MSR-Unix-History/html/Spi15c.html > scroll down to '4 Data Uses', check the graphic, especial file name length. > > My point: _Why_ restrict the development system file name length? > Hehe, OK, I'll bite :). The length of file names under som...