Why I get a different kind of regression equation when I do the same data in a differ

#1
I was wondering why I get a different kind of regression equation when I do the same data in a different way(create DOE in the minitab vs type the data myself ).
For example, when I do the job as the picture 1 below, I can get the regression equation:
(If there is no picture, please see the attachment)

However, If I create a new factorial design as the picture 2 below, I got a different equation, and I did not know how to use that equation to predict the response. I did the setting because I would like to analyze the 3 level experiment. I would like to know what the second equation means.
 

Attachments

Last edited:
Elsmar Forum Sponsor

Miner

Forum Moderator
Staff member
Admin
#2
Re: Why I get a different kind of regression equation when I do the same data in a di

The first equation shows the coefficients for uncoded (natural) units. The second equation shows the coefficients for coded (-1, 1) units.
 
#3
Re: Why I get a different kind of regression equation when I do the same data in a di

I do not think so. In the first one, there is a coded equation coeff. on top of my circle.

I think in the first equation, each variable is treated as continuous. The weird equation may mean that if the first level is present (say power of 50), I put 1 for the power_50 variable and 0 for the power250 variable, etc.

How can I let the second method to treat each variable as continuous so that I can get the clean equation as excel one did?

I am asking because in the second weird equation, I cannot simply put a middle power level(say 150, or the coding value) in the equation to predict the response.
I also want to do the 2 factor 3 level fitting. As far as I know, I can only use the second method and get the weird equation
 

Miner

Forum Moderator
Staff member
Admin
#4
Re: Why I get a different kind of regression equation when I do the same data in a di

I understand. The reason is that you created a General Full Factorial design instead of a 2^k design. General Full Factorials are treated as if the factors have discrete levels rather than continuous.
 
#5
Re: Why I get a different kind of regression equation when I do the same data in a di

Thanks a lot.

So, How do I create 3^k design, not General Full Factorial design, which treated as the factors have continuous levels? I think there is no 3^k option in the window.
 

Miner

Forum Moderator
Staff member
Admin
#6
Re: Why I get a different kind of regression equation when I do the same data in a di

You only have 2 levels, so why would you do that?
 
#7
Re: Why I get a different kind of regression equation when I do the same data in a di

That is just my example to ask the question.
I have a 3 level factorial experiment now.
Therefore, I would like to have a continuous equation for that.
 

Miner

Forum Moderator
Staff member
Admin
#8
Re: Why I get a different kind of regression equation when I do the same data in a di

I would analyze the resulting experiment as a General Linear Model (GLM). You can find this under the ANOVA menu in Minitab.
 
Thread starter Similar threads Forum Replies Date
Jen Kirley A rather different kind of Union story World News 3
P Design verification driven by new equipment. How is this different than process validation? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 1
R Yield Plot for different groupings Using Minitab Software 3
R IEC 60601-1 - Different methods of achievement of the isolation IEC 60601 - Medical Electrical Equipment Safety Standards Series 1
T Defining sampling plan for different AQL AQL - Acceptable Quality Level 1
F How do you add accuracies for tools with different measurement devices? General Measurement Device and Calibration Topics 1
R Does any here use an internal auditing tool that works on different platforms? Internal Auditing 3
H What is different between PED certificate and CPR certificate? Manufacturing and Related Processes 2
R QMS Standard appilications on different Defense Sector Quality Management System (QMS) Manuals 1
A Statistical Analysis - Check if these organisms at different concentrations affect the growth of wheat seedlings Using Minitab Software 4
M Different procedure templates for different standards - We have two different management systems ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 3
M Identical Sales Package in Different Countries Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 0
E Different requirements for Class II and Class III Medical Devices Other ISO and International Standards and European Regulations 5
C Subsidiaries; same/different Quality Policies? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 9
Q Controlling documents in two different Applications ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 10
A Touch current in single fault conditions test and earth leakage current in normal conditions test, are they really different tests? IEC 60601 - Medical Electrical Equipment Safety Standards Series 8
H IFU in different language other than English EU Medical Device Regulations 5
J Ethicon Suture - Why Ethicon specs are different internationally Other Medical Device and Orthopedic Related Topics 0
A Torque Value for Different types of Fasteners (Socket Head, Button Head, CSK) Manufacturing and Related Processes 2
M Different websites for different markets - FDA, Health Canada or other requirements Medical Information Technology, Medical Software and Health Informatics 4
C PCBA Hardware Component different failure types - How to rate detection? FMEA and Control Plans 8
E Different types of Actions? CARs, OFIs or N/A ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
J DoE (Design of Experiments) - Multiple responses with different factors Using Minitab Software 2
smryan ISO 9001:2015 8.6 & 8.5.1.h) - Redundant or different? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 4
V Additional Controls for processing the raw data on different computers (processing system) Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 5
MrTetris Informational Risk Register - Same hazardous situation, different severity of harms ISO 14971 - Medical Device Risk Management 7
A PFMEA severity score different applications FMEA and Control Plans 11
xfngrs How similar or different are IATF 16949 Vs. ISO 13485 IATF 16949 - Automotive Quality Systems Standard 0
I Requirements for different Labeling Levels 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
S CE Marking requirements - A Medical device with different config sold under same name EU Medical Device Regulations 0
B IATF 16949 - Different Registrars for remote and manufacturing sites? IATF 16949 - Automotive Quality Systems Standard 2
W Transport validation to different climate zones ISO 13485:2016 - Medical Device Quality Management Systems 13
W Design and Process Validation - Different? ISO 13485:2016 - Medical Device Quality Management Systems 6
M Is it ok to provide a different language upon request? EU Medical Device Regulations 25
O New stability - Yes or No - Similar product but for different intended use EU Medical Device Regulations 1
D Design Transfer between two companies with different QMS CE Marking (Conformité Européene) / CB Scheme 3
P Any official doc/spec on different types of Yield calculation? Manufacturing and Related Processes 0
R Medical devices certified by different notified bodies EU Medical Device Regulations 6
V Software as control or protection will lead to different Software Safety Class? IEC 60601 - Medical Electrical Equipment Safety Standards Series 18
M I have 3 different factors - DOE help Statistical Analysis Tools, Techniques and SPC 3
Q Is it acceptable to mix components from two different lots into an assembly? ISO 13485:2016 - Medical Device Quality Management Systems 1
H Numbering for documents with same content but different language ISO 13485:2016 - Medical Device Quality Management Systems 4
T QMS/MDD scope - Two companies located in different places work together Human Factors and Ergonomics in Engineering 10
W Can 2 different sites under different Quality System have a common management review? ISO 13485:2016 - Medical Device Quality Management Systems 4
S Indications for Use - Is it possible to have a different indication for use EU Medical Device Regulations 1
K Sampling Plan for transparent tubular plastic parts from 32 different cavities Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
S Minitab runs at different speeds on identical PCs Using Minitab Software 5
P Is a different 510k is required for each (stand alone) software configurations? Other US Medical Device Regulations 3
K Dueling Metrology Labs - Two different labs telling you two different things General Measurement Device and Calibration Topics 5
S Different Standard Deviations used in Control Charting Statistical Analysis Tools, Techniques and SPC 8
Similar threads


















































Top Bottom