similar to: Doubts about chi-square distribution

Dear R list, I would like to illustrate the origin of the Student t distribution using R. So, if (sample.mean - pop.mean) / standard.error(sample.mean) has t distribution with (sample.size - 1) degree free, what is wrong with the simulation below? I think that the theoretical curve should agree with the relative frequencies of the t values calculated: #== begin options===== # parameters

Dears friends, I have been translating and extended, with educational porposes only, the available material in the www (http://zoonek2.free.fr/UNIX/48_R/all.html) "Statistcs avec R" for the Portuguese of Brazil. I consider the material very good and would like to share this work with anothers users R. Already I translated and I extended two chapters: Introduction to the R and analysis

Dear list, I'm needing submit values (V1 = 8,6,4,3,1,2,9) (Id = 2:8) of a data.frame (DF), like below Id V1 V2 ... 1 0 1 ... 2 8 10 ... 3 6 2 ... 4 4 4 ... 5 3 7 ... 6 1 8 ... 7 2 6 ... 8 9 7 ... 9 6 1 ... 10 5 4 ... to selection (>=2 and <8) for remanescents like below: Id V1 V2 ... 1 0 1 ... 2 .

Dear R list, I'm trying to calculate Mahalanobis distances for 'Species' of 'iris' data as obtained below: Squared Distance to Species From Species: Setosa Versicolor Virginica Setosa 0 89.86419 179.38471 Versicolor 89.86419 0 17.20107 Virginica 179.38471 17.20107 0 These distances were obtained with proc 'CANDISC'

Hi, I've been looking at ways to make pyramid plots in R. I like the pyramid.plot method in plotrix as it seems the simplest to use and building them in ggplot looks a bit more code intensive than I'd like, being as I'm new to R. This package does pretty much what I need it to do, however I can't seem to scale the x axis labels. The other labels scale fine with labelcex. I

On Saturday, November 2, 2019 10:40:45 PM EET Stephan Bosch <stephan at rename-it.nl> wrote: > I think we already know about this issue (tracked as DOP-942). It > apparently happens because qmail masks the SIGCHLD signal while Dovecot > doesn't unmask it before waiting for children. You're right. Isn't this a simple fix - a call to sigprocmask ? This should not be a

Is it possible to query LDAP differently for different protocols? I am using dovecot for both pop3/imap and lmtp deliveries and there are different enable flags in ldap for them. I tried wrapping user_filter inside the protocols in the file dovecot-ldap.conf.ext as shown below but this didn't seem to work. protocol lmtp { user_filter =

Dears, I've been learning biplot (Gabriel, 1971) and I found the function 'biplot', inside of the package 'stats', useful but, a bit limited. So, I'm thinking to start a colaborative package to enhance this methods to other multivariate methods. In this way, I would like to start it, making public a new function (biplot.pca, still in development, but running) that make

I am wondering why sieve-filter is so slow compared to gnu sieve. I run mpop (like getmail) to download from a pop3 server to a local mbox file: ~/mail/email-incoming-unsorted This step is very fast. The next step, I throw the email-incoming-unsorted mbox file at a sieve processor, to sort the emails from that mbox, into other mboxes, according to the sieve rules file. Up until a couple days

Hi, I think I have identified a inaccuracy in dchisq when the non-centrality parameter is non-zero and large. Here's a little test: sys.dchisq.test <- function(N = 100000,mean = 0) { z <- rnorm(N,mean = mean, sd = 1) x <- z^2 xmin <- min(x) xmax <- max(x) br <- seq(xmin,xmax,length = 101) dbr <- br[2]-br[1] hist(x,br) p <- dchisq(br,df = 1,ncp =

Hi, I'm testing dovecot 2.1.0, on Debian 6.0, with "passdb driver = imap" and SASL for postfix's SMTP-Auth, like explained ih this howto: http://wiki2.dovecot.org/HowTo/PostfixAndDovecotSASL Authentications over IMAP (local dovecot -> remote dovecot) works fine, and it's great. Also smtp-auth on postfix (over SASL) works fine. But in the dovecot log I found this

Dear list, I had some confusion regarding what function too use in order too relate results from spec.pgram() too a chi-square distribution. The documentation indicates that the PSD estimate can be approximated by a chi-square distribution with 2 degrees of freedom, but I am having trouble figuring out how to do it in R, and figuring out what specifically that statement in the documentation

Hi, pchisq -> distribution function dchisq -> density function pval is the area under the curve, to calculte it you use distribution function which is the integral of density function. See: http://www.itl.nist.gov/div898/handbook/eda/section3/eda362.htm http://mathworld.wolfram.com/DistributionFunction.html f(x) density function F(x) distribution function =Pr(X<x)= integral(f(x))

Hi! This is going to be a real newbie question, but I can't figure it out. I'm trying to plot densities of various functions of chi-square. A simple chi-square plot I can do with dchisq(). But e.g. chi.sq/degrees of freedom I only know how to do using density(rchisq()/df). For example: plot(1, type="n", xlab="", ylab="", xlim=c(0,2), ylim=c(0,7)) for (i

Dears members of R list, I would like that a more experienced R user help me to complete this analysis: r = gl(3, 8, label = c('r1', 'r2', 'r3')) e = rep(gl(2, 4, label = c('e1', 'e2')), 3) y = c(26.2, 26.0, 25.0, 25.4, 24.8, 24.6, 26.7, 25.2, 25.7, 26.3, 25.1, 26.4, 19.6, 21.1, 19.0, 18.6, 22.8, 19.4, 18.8, 19.2, 19.8, 21.4, 22.8, 21.3) df =

Hi, Does anyone happen to know the right strings to do authentication against mysql storing vpopmail data, vs using the vpopmail auth module? I'm trying to get up to both vpopmail 5.5, and dovecot 2.0, and dovecot-auth seems to reliably segfault on the 5.5 vpopmail module. I've tried downgrading vpopmail as well, with less than stellar results. I saw an old article about doing

Hi, How do we get the value of a chi square as we usually look up on the table on our text book? i.e. Chi-square(0.01, df=8), the text book table gives 20.090 > dchisq(0.01, df=8) [1] 1.036471e-08 > pchisq(0.01, df=8) [1] 2.593772e-11 > qchisq(0.01, df=8) [1] 1.646497 > nono of them give me 20.090 Thanks, cruz

http://dovecot.org/releases/2.2/beta/dovecot-2.2.beta2.tar.gz http://dovecot.org/releases/2.2/beta/dovecot-2.2.beta2.tar.gz.sig A ton of fixes since beta1. Especially the new dsync and the replication server related to that should really work now. It also works correctly now for shared mailboxes with private \Seen flags. And the replication server uses incremental syncing after the initial full

http://dovecot.org/releases/2.2/beta/dovecot-2.2.beta2.tar.gz http://dovecot.org/releases/2.2/beta/dovecot-2.2.beta2.tar.gz.sig A ton of fixes since beta1. Especially the new dsync and the replication server related to that should really work now. It also works correctly now for shared mailboxes with private \Seen flags. And the replication server uses incremental syncing after the initial full

For certain users, I have their mail boxes under /srv/mpop/<username>/Maildir. For the rest, I have their mail boxes under /srv/vmail/<username>/Maildir. mpop/ users are stored in LDAP, vmail/ users are local users so I discard the idea of set a fixed mail_location. In dovecot-ldap.conf I can't get the picture to set /srv/mpop/<username>/Maildir as mail. I'd tried