Statistical Comparison of Product: High Average vs. Low Range

F

FPT2001

#11
There is no specification, only a testing procedure. This is why this is more difficult to quantify. We want a method to compare results and assume the higher number is a better product.

Given the data supplied, assume a higher value is a better product, is the product with a high avg/high range better than the product with a lower avererage/lower range ?
 
Elsmar Forum Sponsor

Bev D

Heretical Statistician
Staff member
Super Moderator
#12
Given the data supplied, assume a higher value is a better product, is the product with a high avg/high range better than the product with a lower avererage/lower range ?
Well, I would start with a simple plot of the data. The individual data points for each product. This will tell you more about what is going on then any statistical analysis. By looking at the data you can pick out what aspects you want your marketing folks to concentrate on and even determine which statistic will be helpful.

I put together a really quick set of plots showing the differences between the products using the summary statistics you provided. It is attached.

Of course which is better is really a function of the use. as you know, some customers may value predictable life even if the life is shorter. That said the longer product appears (since I don't know the shape of the distribution) to be substantially longer life...
 

Attachments

D

Darius

#13
There is no specification, only a testing procedure. This is why this is more difficult to quantify. We want a method to compare results and assume the higher number is a better product.

Given the data supplied, assume a higher value is a better product, is the product with a high avg/high range better than the product with a lower avererage/lower range ?
:2cents:Put your self in the place of your customer, if you could buy a light bulb and have 2 options:
1- it could last 1 year but you could not be sure if it could last 10 or 14 months
2- a ones that last exactly 5 months (no less or more days)

Wich one does you buy?:bonk:, But if you do parts for planes, wich one does you buy (you can tell your costumer to replace the parts as a periodical maintennance routine)? :rolleyes:
 
B

BethP

#14
At the company I work, we make a number of product claims against competitor products. These are made VERY carefully with guidance from our in house legal team because the competitor products have a tendency to fight anything that is printed on packaging or advertised. From a testing perspective, we try to work with ASTM and other standard test protocols as much as possible with independent test labs performing the tests. Additionally, we test enough samples to determine whether we have a normal distribution and can statistically show that we are better, stronger, faster, etc. The challenge is that the marketing team is not always patient with the technical team.

I echo the advice already written - think about the product from the consumer perspective - what are the significant factors in their buying decisions? what comparisons do they make to determine who to purchase from? It could be that favorable credit terms are a more important deciding factor than product lifespan.
 
Last edited by a moderator:
Thread starter Similar threads Forum Replies Date
S How to perform verification of the Statistical Analysis Software? Qualification and Validation (including 21 CFR Part 11) 2
M V&V phase: Justification of acceptance criteria (statistical method ) - (Medical Device) Design and Development of Products and Processes 2
Bev D Statistical Alchemy Misc. Quality Assurance and Business Systems Related Topics 1
K Looking for guidance to write an SOP on Statistical Methodologies? Statistical Analysis Tools, Techniques and SPC 7
M Minimum sample size - Guidance and statistical rationale Inspection, Prints (Drawings), Testing, Sampling and Related Topics 3
N Design Verification & Process Validation - Statistical sample sizes Design and Development of Products and Processes 2
John Predmore Interactive visualization through graphical simulation of statistical concepts Statistical Analysis Tools, Techniques and SPC 3
Bev D Profound Statistical Concepts Misc. Quality Assurance and Business Systems Related Topics 63
A Statistical Analysis - Check if these organisms at different concentrations affect the growth of wheat seedlings Using Minitab Software 4
H Statistical Techniques Procedure - What should be included Document Control Systems, Procedures, Forms and Templates 4
O Statistical justification of sampling size in V&V tests ISO 13485:2016 - Medical Device Quality Management Systems 5
optomist1 It’s time to talk about ditching statistical significance Statistical Analysis Tools, Techniques and SPC 6
Marc Steve Prevette's Statistical Process Control (SPC) "Library" Statistical Analysis Tools, Techniques and SPC 0
John Predmore A Balanced view of statistical tests Statistical Analysis Tools, Techniques and SPC 3
V Statistical basis and justification while comparing / changing sampling plans Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 11
S SPC (Statistical Process Control) for Unilateral Tolerance - Questions Statistical Analysis Tools, Techniques and SPC 6
S IATF 16949 9.1.1.3 Application of statistical concepts - Our technicians are quizzed for statistical knowledge IATF 16949 - Automotive Quality Systems Standard 3
K Please help identify appropriate statistical treatment Statistical Analysis Tools, Techniques and SPC 13
ScottK Statistical basis for 30 pieces for FAI 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 7
B IATF 16949 clause 7.1.5.1.1 - Statistical studies shall be conducted IATF 16949 - Automotive Quality Systems Standard 3
A Statistical Process Control and Inspection in Footwear Production Statistical Analysis Tools, Techniques and SPC 0
M IATF 16949 Cl. 7.1.5.1.1 - Statistical studies shall be conducted IATF 16949 - Automotive Quality Systems Standard 3
Steve Prevette Statistical Process Control Library Statistical Analysis Tools, Techniques and SPC 17
Marc Happy Birthday Statistical Steven - 2015 Covegratulations 10
L When are Statistical techniques not applicable? Service Industry Specific Topics 16
M FDA 21 CFR 820.250 - Does "valid statistical" always mean math? 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 6
R Common Statistical Errors Using Minitab Software 1
Y Statistical Analysis of Road Traffic Data Statistical Analysis Tools, Techniques and SPC 11
B Class II Medical Device Manufacturer - SOP for 820.250 Statistical 21 CFR Part 820 - US FDA Quality System Regulations (QSR) 3
E Correct Statistical Test comparing 2 Groups Statistical Analysis Tools, Techniques and SPC 14
A Statistical Software Calibration using Ford's "Sample Calibration File" Statistical Analysis Tools, Techniques and SPC 8
J Defining Martial Arts and Gymnastics Statistical Techniques Statistical Analysis Tools, Techniques and SPC 4
J Capability Analysis - Unusual Statistical Distribution of my Proccess Capability, Accuracy and Stability - Processes, Machines, etc. 5
M PhD Thesis Data Statistical Analysis Methods Statistical Analysis Tools, Techniques and SPC 2
J Statistical Significance and SPC Control Chart Reports Statistical Analysis Tools, Techniques and SPC 9
N Statistical Quality Improvement Action for Small Batch Production Statistical Analysis Tools, Techniques and SPC 17
V Validation of macro - scripts - programs used in statistical software (Minitab-SAS... Qualification and Validation (including 21 CFR Part 11) 5
Moncia Statistical Process Control Crash Course - Question Quality Manager and Management Related Issues 10
H Statistical Models for Predictive Management of Software Processes Software Quality Assurance 2
A Statistical Correlation between ordered SKUs Statistical Analysis Tools, Techniques and SPC 8
S Minitab and Crystal Ball Statistical Analysis Software Using Minitab Software 13
M Determining if two different X's have any Statistical Significance on the Y's Statistical Analysis Tools, Techniques and SPC 4
I Statistical Stability for the PQ of Analytical Equipment Qualification and Validation (including 21 CFR Part 11) 1
E Using ANOVA during the PQ Validation Run to evaluate Statistical Differences Statistical Analysis Tools, Techniques and SPC 4
W Gage R&R for gage pins used to inspect a hole ID called a Statistical Tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
B AS 9100C sec 8.2.4 - " Recognized Statistical Principles" meaning AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 7
R What is PSW - Statistical Process Package + Level 5 APQP and PPAP 7
O Is SPC (Statistical Process Control) always required? Statistical Analysis Tools, Techniques and SPC 4
V Any experience/feedback on statistical software tools...minitab -design expert -JMP Using Minitab Software 4
M SPC (Statistical Process Control) Book Recommendations wanted Book, Video, Blog and Web Site Reviews and Recommendations 1

Similar threads

Top Bottom