R help - Jul 2013 - a very urgunt and important question about R

Dear all

I am doing a research in clinical psychology and I need to Generate a
block randomization for a clinical trial, with two treatments and
three therapists. I mean I must randomize the clients (all women) to
two kinds of treatment (called "treatment as usual" and
"narrative
exposure therapy") and three different therapists.
I tried to do this randomization by using R software and by using
stratification package but I didn't (and still can not) understand how
I should use R for this job.

Could you please help me and show me how I should use R for this kind
of randomization in a really easy way?

I really appreciate your help in advance.

Best
Mina

P.S. I just know little about statistics and software. Please teach me
in a really easy way.

Hi

I recommend to start with

library(fortunes)
fortune("surgery")

Anyway, beside Introduction to R you could go through 

CRAN Task View: Design of Experiments (DoE) & Analysis of Experimental Data

and specifically through

Experimental designs for clinical trials 
This task view only covers specific design of experiments packages; there may be
some grey areas. Please, also consult the ClinicalTrials task view.

*experiment contains tools for clinical experiments, e.g., a randomization tool,
and it provides a few special analysis options for clinical trials.
*Package gsDesign implements group sequential designs, 
*Package gsbDesign evaluates operating characteristics for group sequential
Bayesian designs,
*package asd implements adaptive sequential designs. 
*Package TEQR provides toxicity equivalence range designs (Blanchard and
Longmate 2010) for phase I clinical trials.
*The DoseFinding package provides functions for the design and analysis of
dose-finding experiments (for example pharmaceutical Phase II clinical trials);
it combines the facilities of the "MCPMod" package (maintenance
discontinued; described in Bornkamp, Pinheiro and Bretz 2009) with a special
type of optimal designs for dose finding situations (MED-optimal designs, or
D-optimal designs, or a mixture of both; cf., Dette et al. 2008)

Which shall provide you with some insight.

Regards
Petr

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of mina orang
> Sent: Friday, July 26, 2013 10:26 AM
> To: r-help at r-project.org
> Subject: [R] a very urgunt and important question about R
> 
> Dear all
> 
> I am doing a research in clinical psychology and I need to Generate a
> block randomization for a clinical trial, with two treatments and three
> therapists. I mean I must randomize the clients (all women) to two
> kinds of treatment (called "treatment as usual" and
"narrative exposure
> therapy") and three different therapists.
> I tried to do this randomization by using R software and by using
> stratification package but I didn't (and still can not) understand how
> I should use R for this job.
> 
> Could you please help me and show me how I should use R for this kind
> of randomization in a really easy way?
> 
> I really appreciate your help in advance.
> 
> Best
> Mina
> 
> P.S. I just know little about statistics and software. Please teach me
> in a really easy way.
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.

Hi,
You may try:
library(psych)
?block.random()

Also, look this link
http://personality-project.org/revelle/syllabi/205/block.randomization.pdf
A.K.




----- Original Message -----
From: mina orang <minaorang at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Friday, July 26, 2013 4:26 AM
Subject: [R] a very urgunt and important question about R

Dear all

I am doing a research in clinical psychology and I need to Generate a
block randomization for a clinical trial, with two treatments and
three therapists. I mean I must randomize the clients (all women) to
two kinds of treatment (called "treatment as usual" and
"narrative
exposure therapy") and three different therapists.
I tried to do this randomization by using R software and by using
stratification package but I didn't (and still can not) understand how
I should use R for this job.

Could you please help me and show me how I should use R for this kind
of randomization in a really easy way?

I really appreciate your help in advance.

Best
Mina

P.S. I just know little about statistics and software. Please teach me
in a really easy way.

______________________________________________
R-help at r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.