“An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.”

Design and Analysis of Clinical Trials...Factorial Design.. Lesson 14








Lesson 14: Factorial Design


Introduction

A factor is a variable that is controlled and varied during the course of an experiment. In a chemistry experiment, temperature and pressure may be the factors that are deliberately changed over the course of the experiment. In the clinical trial treatment can be a factor. A study of experimental therapy vs. placebo can be thought of as having a treatment factor with 2 levels, 0 or the study dosage. A study with two different treatments has the possibility of a two-way design, varying the levels of treatment A and treatment B.
Factorial clinical trials are experiments that test the effect of more than one treatment using a type of design that permits an assessment of potential interactions among the treatments.
In a factorial design there are two or more factors with multiple levels that are crossed, e.g., three dose levels of drug A and two levels of drug B can be crossed to yield a total of six treatment combinations:
low dose of A with low dose of B
low dose of A with high dose of B
mid dose of A with low dose of B
mid dose of A with high dose of B
high dose of A with low dose of B
high dose of A with high dose of B
Factorial designs offer certain advantages over conventional designs. There are a number of ways that you could look at these groups. This lesson will consider these alternatives...

Learning objectives & outcomes

Upon completion of this lesson, you should be able to do the following:
  • identify the conditions that would allow a factorial design to be useful
  • recognize the difference between qualitative and quantitative interactions
  • recognize the situation for which a ‘min’ test is the appropriate analysis

0 comments:

Post a Comment

About Blogger:

Hi,I,m Basim from Canada I,m physician and I,m interested in clinical research feild and web development.you are more welcome in our professional website.all contact forwarded to basimibrahim772@yahoo.com.


Let's Get Connected: Twitter | Facebook | Google Plus| linkedin

Subscribe to us