Some basic questions about my first DOE response surface design

MIS

Hi everyone,

 

I'm quite new to JMP Pro and the questions I'm about to ask are pretty basic. 

 

I have two independent variables and a dependent variable (response), all three measured using a seven-point Likert scale. The goal is to analyze the within-individual perceptual (in)congruence between the independent variables and their influence on the response. My sample size is 260.

 

Question 1: When I click on "make table" before adding data to the columns, I get the following output. I have some idea what the column Pattern means but I don't know if I should keep it in the analysis. When I populate the 260 records into the X1, X2, and Y columns, what should I do the with Pattern column? Should I keep it as is (with only 10 values while X1, X2, and Y have 260 values) or just get rid of the column?

 

 

Question 2: Did I correctly determine the values for X1 and X2 here? Should I do anything about the Lower and Upper Limit for the response as well (i.e., Lower Limit = 1; Upper Limit = 7). 

 

 

Question 3: In my case, what should be the number of center points? The default I'm seeing is 2. 

 

Your help is greatly appreciated. Thanks.

statman

First, welcome to the community.  Unfortunately, you have not provided enough context about your situation to provide specific advice.  I do have the following questions/comments:

• Sample size of what?  Is this a product or a web page or what?  What is being sampled?
• What are the independent variables?  What is the response variable?
• You apparently already did the "study"?  Is there more than one person in the study? If so, you should have a column identifying the individual(s).
• I'm confused the statement these are on a 1-7 scale.  I assume you mean Ordinal scale.  Likert is a specific type of ordinal scale (invented by Rensis Likert).  It uses words like disagree, somewhat disagree, etc. about statements.  Can you get more than one number for any measure of the sample?
• It seems to me you question the measurement system?  Likely both within individual and between individual components of variation.  This is good to question.
• It does not appear as though you are running an experiment.  So I think you are in the wrong platform?
• Perhaps you are more interested in MSE and possibly Kappa (for inter reliability of categorical data)?

 

https://www.jmp.com/support/help/en/17.2/?os=mac&source=application#page/jmp/overview-of-attribute-gauge-charts.shtml#

 

https://www.jmp.com/support/help/en/17.2/?os=mac&source=application#page/jmp/agreement-statistic-report.shtml

 

Oh and you can likely ignore the pattern column.