[R] Two Factorial Experiment with a Single Control Group
Darcy Trimpe
darcy.m.trimpe at wmich.edu
Tue Apr 21 12:49:43 CEST 2015
Good Morning,
I am not asking for a method by how to implement, if possible, the method in R. I am pretty confident of my statistical approach, I do not want to do it by hand :-). Although, I do have the formulas to do it by hand. The groups are measured once. The animal is treated short or long term unilaterally and not at all on the contralateral side. Each animal provides a no tx and tx value taken at the same end point. The external controls have had neither side treated. I have included a sample data table below:
Treatment
Duration No Tx TX
acute 7 9
acute 5 8
acute 4 7
3 weeks 21 23
3 weeks 28 27
3 weeks 26 29
No Tx No Tx
Control 3 2
Control 4 5
Control 7 9
Thanks for your continued help.
----- Original Message -----
> From: "c06n [via R]" <ml-node+s789695n4706187h3 at n4.nabble.com>
> To: "Darcy Trimpe" <darcy.m.trimpe at wmich.edu>
> Sent: Tuesday, April 21, 2015 1:36:28 AM
> Subject: Re: Two Factorial Experiment with a Single Control Group
> Hi,
> I'm not 100% sure I understand your approach. Right now it sounds
> more of a methods question than a R question.
> Here's what I understood so far:
> 1. you have 3 groups: no treatment at all, acute treatment, treatment
> over 3 weeks.
> 2. you measure those 3 groups: initially, after 3 weeks.
> That sounds to me that you have only 1 factor with 3 levels, and
> measure your dependent variable twice. This would yield a typical
> one factorial within-design.
> But I somehow feel that is not really your design. Can you provide an
> example table for the factor combinations with example data (can be
> made up)?
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