Y

#### yasharif

Hello All
Is there anyone who can help me solving the problem with DOE?
I am new user of DOE and minitab.

I have a database of roadmarkings like centre yellow line and white edgeline and their reflective number at night time to guide the drivers in dark.

So for a particular road I have
1. Annual daily traffic
2. Time ( months)
3. And degradation number for those reflecteting numbers of those road markings

How can I predict an equation through the database by building a model?

I was trying to make a full factorial design ..

Regards
Sharif

#### Miner

##### Forum Moderator
Staff member
Re: DOE -Minitab New user

To use a DOE approach, you must create the design first, run the experiment exactly per the design, then analyze it. When you have historical data, you cannot try to force fit it into a factorial experiment. You must analyze it differently.

To recommend an appropriate method, we need to know a little more about the degradation number. Is it an objective parameter measured on a continuous interval/ratio scale, or is it a subjective appearance rated on an ordinal scale? The answer to this question will limit the available options.

For example, if it is continuous data you might be able to use regression analysis or degradation analysis (a reliability tool). If it is ordinal, you might use ordinal logistic regression.

Y

#### yasharif

I really appreciate.

I have a database:
Interstate ADT(avg daily traffic) IRL 1yrRL 2ndyrRL...5thyrRL
I-95 15000-25000 800 750 650 340

I-95 is a highway where average daily traffic is from 15000-25000. The roadmarking or roadsign that were put initially to guide the car/driver at nighttime had IRL(initial retro reflective number) of 800 and the material was polyurea. It can be thermo or paint also. Then an instrument is used and the reading of the roadmarking taken a year later and found 750 and then the later years 650,340...and son on may be upto 7th year.

I developed an exponential degradation model from the database but does not look satisfactory to my BOSS.

Now my goal is to find the cost effectiveness of these materials.

Is there any otherway you can suggest or advice me..

Thank you once again.

Regards
Sharif

#### Miner

##### Forum Moderator
Staff member
Sorry for the delay in responding. I have been offline for a week.

Given the information that you have provided, I would probably approach it from a reliability degradation analysis. Which distribution you choose depends on the data. I will comment that the exponential distribution is probably an incorrect choice because it is used for random failures. By definition degradation analysis is performed on wearout failure modes. The most flexible distribution for modeling wearout is the Weibull distribution, but other distributions might fit better.

Y

#### yasharif

Hi Miner
Is there anyway I can use Minitab to do the weibull distribution? Do you have any example or link ?

Thank you.
Regards
Sharif

Y

#### yasharif

Dear Miner
I am attaching an image link to my dataset. Its just a snapshot of the big database.
I am really very new to Minitab. If you could show me the steps how to plug this data for weibull or degradation analysis in Minitab 16?

I really appreciate your help and time .

Thank you very much.

Regards
Sharif

#### Miner

##### Forum Moderator
Staff member
Can you attach the image directly? File sharing sites are blocked here.

Y

#### yasharif

Basically we have 3 material : Polyurea, Thermo, Paint.
This data is for Thermo.
And we have different ADT. The maximum ADT we have is 113000 and the least one we have is 250 ADT. But particularly in this road for thermo the ADT is given in the image.

Thank you again.
Sharif

#### Attachments

• 13.6 KB Views: 157

#### Miner

##### Forum Moderator
Staff member
The data raise a lot of questions. The results seem to deteriorate then improve then deteriorate again. This begs some questions:
1. Was there a measurement methods change or measurement device change?
2. Is the measurement a single value or the average of multiple measurements?
3. Have you quantified the measurement variation?
4. If the measurement is a single value, how much variation is there along a stretch of highway?

Amendment Class II - Please confirm if the submission is by email (Canada) - Help Canada Medical Device Regulations 0
Please, help with document on ISO/ TS 17758 and (IDF 87: 1979). Thank you. Manufacturing and Related Processes 1
L Please help me with the process of getting ISO 9001 certified Quality Management System (QMS) Manuals 15
K Please Help! what is ARL for the range and standard deviation Statistical Analysis Tools, Techniques and SPC 0
Please help me with attached copy of AS 9100D internal audit check sheet AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
J Please help me understand what a process is ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 5
V Revised ISO std vs ISO13485:2003 - Help Please!!! ISO 13485:2016 - Medical Device Quality Management Systems 4
L Newly API Q1 9th Edition applicant HELP please =) Oil and Gas Industry Standards and Regulations 3
S Informational Please help this newbie understand ISO 9001 Work Instructions ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 44
M Please help to change the numbering in level 3 of structure Document Control Systems, Procedures, Forms and Templates 1
D Please help for the CISSP (Certified Information Systems Security Professional) Exam Professional Certifications and Degrees 2
Please help me define training requirements for a Career in Regulatory Affairs 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 2
B Help with NDC (Number of Distinct Categories) Please Six Sigma 2
N If ew(t)=2339, how do I find T? Please help on Maths Problem Brain Teasers and Puzzles 3
ISO 9001:2008 Gap Analysis Template - Please help ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
B Product Realisation Process Map - Need some help, please review and comment ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 6
T Please help me interpret my GR&R results Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 2
M Can anybody help me with Management Review scenario please? ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 8
V Help needed with ISO 14001 Procedures please ISO 14001:2015 Specific Discussions 7
N I have 2 groups to compare - Minitab and stats newbie - Please help Using Minitab Software 18
B 5 Why help needed Please kindly review Problem Solving, Root Cause Fault and Failure Analysis 15
G Newbie in IMDS - Please help me understand what I have to do RoHS, REACH, ELV, IMDS and Restricted Substances 4
B Green Initiative - Please help me in preparing Go Green Steps.... Sustainability, Green Initiatives and Ecology 6
Shiftwork Scheduling - An unusual problem - Need help please Human Factors and Ergonomics in Engineering 13
S Opening Up Tolerances - We have over 6000 live drawings - help please Design and Development of Products and Processes 6
Help please - Mechanical Latch Design Principles? Design and Development of Products and Processes 2