# How create a Fractional Factorial Design with Minitab

T

#### tenebra87

hello, how does Minitab generate a factorial fraction plan 1/4 with 9 factors (2^9-4)?
Can you help me?

thanks

Luca

A

Re: How create a fractional fatorial design

I'm on version 15, so the guidance should work from everything from version 13 on.

In Minnie, select STAT>DOE>Factorial>Create factorial design

That gives you a dialog box where you select the framework - how many levels for the factors (assuming a 2-level design here) and how many factors you will have - being 9 per your post.

As you note a 2^9-4, that's actually a 1/16 fraction with 32 experimental runs. If you meant a 1/4 fraction, that's a 2^9-2 with 128 runs. The 1/16 fraction (2^9-4) is a resolution IV design, so you'll be able to see main effects with minimal confounding and should be able to see enough of the 2-way interactions (aliased with the 3 ways) to get a good result.

In Minnie, click the "Designs" button, then highlight the 1/16 fraction and click ÖK". From there, the previous dialog box will come up, allowing you to select "Factors", where you can label each and assign the type (numeric or attribute/text). Once you've completed that part, "click the Öptions" button. This is really where you decide if you want minnie to randomize the runs for you. Make sure that box is checked. After that, you can look at the "Results" button if you need something beyond the default info minnie provides.

The click "OK" on the dialog box and minnie will geerate the design matrix for you. You'll need to add your response to the worksheet and you should be able to then go run your experiment.

Hope this helps.

T

#### tenebra87

Re: How create a Fractional Fatorial Design with Minitab

Thanks for your answer. I have already performed and analyzed DOE. My question was, how does Minitab create a factorial fraction pla 1/16 with 9 factors? how does it choose the fraction?

thanks

Last edited by a moderator:
A

Re: How create a Fractional Fatorial Design with Minitab

Sorry, couldn't tell all that from your original post, but I really dig DOE, so hopefully it was a fun experiment!

In the series of dialog boxes within Minnie, when you selected the 2-level design and specified the number of factors, Minnie gave you 2 options for your 2-level factorial: default generators or custom generators.

My guess is you went with the defaults - and if so, what Minnie did was use the normal aliasing structure for a fractional design. So for a series of factors, A, B, C, D, ... the aliasing starts with A=BCD and carries on from the main effects onward. These use the postive fraction to start - which is why Minnie asks if you want to fold the design (slightly off topic though). But in any event it help you in case you observe any confounded effects when you try to analyze the results.

If you want a great reference to see the whole structure in all its glory, check out Design and Analysis of Experiments by Douglas Montgomery. Fantastic book. I have the 4th ed. and I know it's several past that now, but contains the aliasing structure for 2-level designs out to about as many factors as you have used.

Hope this is what you are after.

Cheers,

B How to use Minitab to create this Fractional Factorial Design Matrix Using Minitab Software 2
ISO 13485 - 7.3.6 Design and development verification - Do most folks create a separate SOP? ISO 13485:2016 - Medical Device Quality Management Systems 6
Question: How to create an IMDS RoHS, REACH, ELV, IMDS and Restricted Substances 3
Do we need to create a new CER or can we just update the existing CER EU Medical Device Regulations 3
Create your own symbol? Other Medical Device Related Standards 7
How to create IQ, OQ, PQ protocol for existing equipment Other Medical Device Related Standards 2
O How to create robustness checklist from p diagram FMEA and Control Plans 9
Change control and configuration management - When to create a new model/part number? Other Medical Device and Orthopedic Related Topics 0
R How to create a Work Breakdown Structure? Registrars and Notified Bodies 2
H IMDS for material - Can my Customer create one for my material? RoHS, REACH, ELV, IMDS and Restricted Substances 4
A How do I create a 3^k factorial design with factors be treated as continuous where I Using Minitab Software 0
How do I create a FMEA for the Internal Audit process? Internal Auditing 11
S Response Surface Method to create design matrix in Minitab Using Minitab Software 5
S Cannot create Rejects for TMV on a medical instrument with an LCD Other Medical Device and Orthopedic Related Topics 10
Carte Blanche to Create an Audit Programme General Auditing Discussions 5
O Is it "legit" to create IMDS before Part Production? RoHS, REACH, ELV, IMDS and Restricted Substances 4
G How to create a mixed OAs in Minitab Using Minitab Software 1
S How to create an Audit Checklist using a Turtle Diagram Internal Auditing 9
A Could I create company specific Employee Records? Records and Data - Quality, Legal and Other Evidence 5
A How to create a Maintenance procedure based on TS 16949 Requirements IATF 16949 - Automotive Quality Systems Standard 5
How do I create two different columns in Excel spreadsheet ? Excel .xls Spreadsheet Templates and Tools 5
J Inspection Software to Balloon Drawings and Create First Article Reports Inspection, Prints (Drawings), Testing, Sampling and Related Topics 2
T Microsoft Access Database to create a Simple Calibration Certificate General Measurement Device and Calibration Topics 6
J Should a company create different SOPs for ISO14971? ISO 14971 - Medical Device Risk Management 1
How do you Create SOPs for Multiple Authorities? EU Medical Device Regulations 8
How to create a pop-up message in Excel Excel .xls Spreadsheet Templates and Tools 18
M What is the formula to create a bell curve? Excel .xls Spreadsheet Templates and Tools 8
M ISO/TS 16949:2009 Follow-up Audit Visits to create more Revenue IATF 16949 - Automotive Quality Systems Standard 12
Q Medical Device with Lead (Pb) - Do I need to create an MSDS sheet? Other US Medical Device Regulations 1
C Document Control using Wiki - Cannot Create all Documents as Wiki Pages Document Control Systems, Procedures, Forms and Templates 10
How to create the Policy for determining criteria for Risk Acceptability ISO 14971 - Medical Device Risk Management 11
A How to create a Multiple Operations Specifications Comparison Spreadsheet? Excel .xls Spreadsheet Templates and Tools 3
K When to create a new Control Chart? Quick question Statistical Analysis Tools, Techniques and SPC 4
A How to create Drop Down Box in Excel 2007 Excel .xls Spreadsheet Templates and Tools 2
N Asked to create a baseline survey on emails that come in and out of our Office Document Control Systems, Procedures, Forms and Templates 1
J How Do Processes Create Value? Article by Paul Harmon Book, Video, Blog and Web Site Reviews and Recommendations 2
W Requirements Traceability Database - Have one? Help create one? Document Control Systems, Procedures, Forms and Templates 1
S HR Manager refusing to create Quality Objectives - Is this a Non-Conformity? Quality Manager and Management Related Issues 11
S How do I create a Technical File for a Class IIa Medical Device EU Medical Device Regulations 5
C SOP (Standard Operating Procedure) on how to create an SOP Document Control Systems, Procedures, Forms and Templates 6
O Need to Create Macros so that it can copy data to the next row.... Excel .xls Spreadsheet Templates and Tools 5
B Who should create training associated with changes to the procedures? Document Control Systems, Procedures, Forms and Templates 7
J Environmental FMEA - Is it possible to create an environmental FMEA? FMEA and Control Plans 12
C Need help to create tracking tool Excel .xls Spreadsheet Templates and Tools 4
L Customer requirement to create a Guide for defining Control Methods FMEA and Control Plans 9
How to create Stoplight Control charts with excel? Excel .xls Spreadsheet Templates and Tools 16
W Medical Device FMEA vs. ISO 14971 to create our Hazard Analysis ISO 14971 - Medical Device Risk Management 2
B How Can I Create a Bell curve in Excel 2007 Excel .xls Spreadsheet Templates and Tools 7
How to create a flow for APQP including design and no including design APQP and PPAP 5
V How to create a CAPA (Corrective Action Preventive Action) Database Nonconformance and Corrective Action 3