similar to: Compraring two independent samples

Hi, Typical things you read when new to stats are cautions about using a t-statistic when comparing independent samples. You are steered toward a pooled test or welch's approximation of the degrees of freedom in order to make the distribution a t-distribution. However, most texts give no information why you have to do this. So I thought I try a little experiment which is outlined here.

Apologies for the off-topic question; as usual I'm trying to draw upon the unparalleled knowledge and sagacity of the r-help list. Please reply off-list if you can help me out. A collaborator of mine found a formula we need, on sheets which he had photocopied out of a book, some years ago. He cannot remember which book (he's getting to be as senile and forgetful as I am, poor bloke!).

Here's one for you phone people.... An elderly lady phoned her telephone company to report that her telephone failed to ring when her friends called - and that on the few occasions when it did ring, her pet dog always moaned right before the phone rang. The telephone repairman proceeded to the scene, curious to see this psychic dog or senile elderly lady. He climbed a nearby telephone pole,

Hey all, Working slowly on getting the myriad number of parts to my fax system plan together, and one of the pieces I want to nail is how to go about, for the outbound context (fax-out) pre-pending a digit onto a number? I.e., for all my testing right now, I've been dialing '91XXXXXXXXXX', as the asterisk server doing faxing junctions into my old Rolm CBX switch, and so I need the

Hi - I apologize for the 2nd post, but I think my question from a few weeks ago may have been overlooked on a Friday afternoon. I might be missing something very obvious, but is it widely known that the aggregate function handles missing values differently depending if a data frame or a formula is the first argument ? For example, (d<- data.frame(sex=rep(0:1,each=3),

Estimados En el sitio de https://www.rstudio.com/ hay un aviso sobre http://spark.rstudio.com/index.html ( sparklyr ). Microsoft publico un artículo donde comparan el R Server que está dentro de SQL server (o por separado, depende un poco), o el Microsoft R, junto con algunas librerías que se pueden compilar y obtener lo mismo en Ubuntu. Supongamos que tengo el dinero como para comprar por

Esta pregunta nos la hicimos muchos, alguien aproxima una respuesta a través de esta publicación: http://www.scielo.org.ar/pdf/ecoaus/v18n2/v18n2a07.pdf Saludos cordiales Teresa -- Ing. Agr. M.Sc.Teresa Boca Instituto de Clima y Agua INTA Castelar. Las Cabañas y Los Reseros s/n° 1712 Castelar Pcia de Buenos Aires, Argentina Cel: 01115-3572-9584 Tel: (54-11)-4621-0125/1684 Fax:(54-11)-4621-5663

Hello I wonder whether there is an r tool or package available for testing for the null of same skewness or kurtosis of two independent samples. It semes that nsRFA package uses L-moments for soothing similar but I could not get how to use the package for the above test. Any pointers, help, example and etc. will be most welcome. Many thanks Ed [[alternative HTML

Dear R users, I have got two samples: sample A with observation of 223: sample A has five categories: 1,2,3,4,5 (I use the numer 1,2,3,4,5 to define the five differen categories) there are 5 observations in category 1; 81 observations in category 2;110 observations in category 3; 27 observations in category 4; 0 observations in category 5; To present the sample in R: a<-rep(1:5,

Hola Hace poco comence a utilizar R y tengo dudas como utilizar el paquete de tree saludos ruddi --------------------------------- Yahoo! Sorteos ¡Ya puedes comprar Lotería de Navidad! [[alternative HTML version deleted]]

Estimado Carlos Gil Bellosta ¿Cómo está usted? En estos lados de América del sur comienza la primavera, desde la ventana miro la parra contando las posibles uvas, siempre aparece un ave que se arrima a la ventana o incluso llegan hasta la computadora como si supiesen usarla. Ahora en R. En ese esquema un modelo lineal tendría que ir con mlib que es aportada por sparklyr, en ese caso tendría

Hello, the voice-communication TeamSpeak (www.teamspeak.org) is currently testing a version that supports speex codecs. The quality for high bitrates is quite good. BUT, the low-bandwidth speex codecs that are currently used arent very good. What I did to find this out: I comprared a speex AVB with 6.3 KBit/sec (total, overhead for packets and stuff included) and the 6.3 Kbit/sec Celp Codec

Andrew, can you please send this on to Linus and -stable ASAP? It's causing massive problems for our users. On Thu, Aug 12, 2010 at 04:50:59PM -0400, Jeff Moyer wrote: > Hi, > > commit c2c6ca4 (direct-io: do not merge logically non-contiguous > requests) introduced a bug whereby all O_DIRECT I/Os were submitted a > page at a time to the block layer. The problem is that the

http://dovecot.org/releases/1.0/dovecot-1.0.3.tar.gz http://dovecot.org/releases/1.0/dovecot-1.0.3.tar.gz.sig - deliver: v1.0.2's bounce fix caused message to be always saved to INBOX even if Sieve script had discard, reject or redirect commands. - LDAP: auth_bind=yes and empty auth_bind_userdn leaked memory - ACL plugin: If user was given i (insert) right for a mailbox, but not all

http://dovecot.org/releases/1.0/dovecot-1.0.3.tar.gz http://dovecot.org/releases/1.0/dovecot-1.0.3.tar.gz.sig - deliver: v1.0.2's bounce fix caused message to be always saved to INBOX even if Sieve script had discard, reject or redirect commands. - LDAP: auth_bind=yes and empty auth_bind_userdn leaked memory - ACL plugin: If user was given i (insert) right for a mailbox, but not all

When I upgraded my old, long running dovecot 1.1 to newer dovecot-1.2.4 + doevecot-sieve- 0.1.12 I observed a change in destination address (-a) parsing. Old behaviour: When Timo introduced this feature (http://www.dovecot.org/list/dovecot/2007-September/025813.html) it was possible to hand over only the detail part. In my sendmail configuration I used "-a +$h", where $h contains the

From: Wang Shilong <wangsl.fnst@cn.fujitsu.com> Scrubing supers is not in a transaction context, when trying to write supers to disk, we should check if we are trying to scrub supers.Fix it. Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com> --- fs/btrfs/disk-io.c | 2 ++ fs/btrfs/transaction.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/fs/btrfs/disk-io.c

Most fixes are trivial. The one from Alex is fixing a real bug that several users have reported. Alex sent the patch half a year ago and it was not yet integrated. The patch "Use /proc/mounts instead of /etc/mtab" is a repost. The patch "btrfs-receive optionally honors the end-cmd" is a preparation step to allow backup tools to multiplex a single communication stream (e.g. a

Estimado Carlos Ortega Comprendo que hay que tener el paquete compilado para acceder al alto rendimiento, por lo cuál si está todo preparado para trabajar en un clúster y para aprovechar múltiples hilos, no habría problemas, calculo que si una librería no tiene esa tecnología no traería inconvenientes, ¿o por el contrario si está distribuido crea varias instancias y al correr separadas hay

Hello: I have found the following problems with outgoing calls with asterisk, compiled with an updated CVS on 22 Oct. 1.- Problem with retries: Whenever I set the MaxRetries parameter, to something greater than 0 in a call-fille, Asterisk ignores the RetryTime parameter and retries every file in the outgoing folder when a new call-file is copied into that folder. So, if I make a call placing