Is there an SOP on Rounding Numbers

A

Aaron Lupo

#1
I was wondering if any one out there has a SOP on rounding? If you do I would appreciate it if I could get a copy to use as a guide and or model.

Thanks
 
Elsmar Forum Sponsor
D

Don Watt

#2
Hi ISO GUY,
Please excuse my ignorance (I suspect I'm not the only one though), what do you mean by "rounding"?
 
A

Aaron Lupo

#3
Sorry I should have explained myself. What i was looking for is a procedure on rounding numbers, to make sure that the company is all doing it the same way. For example you have 1.55 and you only need to go out to tenths is it 1.5 or 1.6? I know the people I work with a very intelligent but I was just looking for some guidance on writing a procedure so that we all do it the same.
 
S

Steven Truchon

#4
Interesting topic.
I would think that rounding to whatever the application requires would be the best route. For example, if dealing with mfg tolerances at .xxx but result or measurement data is at .xxxx, round to the third place. It keeps apples with apples so to speak. I have only seen this not be effective when dealing with absolute minimum and maximum limits.
As for things like QS9000 requiring Cpk minimums of 1.33, I would round to two places as the reqs are written, 1.324=1.32 and 1.325=1.33 etc. I realize that the Cpk example is a minimum limit requirement, but we set our software and procedures up to reflect two decimal places and it was acceptable to our registrar, so...
As for your own systems purposes, I suppose selecting the resolution you feel is sufficient to the application and round to that.
 
A

AJPaton

#5
Just to add another log to the fire, our rounding problems come up when we have dies that are fractional rather than metric.

So then we have numbers that can't be rounded.

And when rounding you've got to take GD&T into account, since tolerances add up. :( (Learnt it the hard way)

AJP
 
S

Steven Truchon

#6
Originally posted by ISO GUY:
For example you have 1.55 and you only need to go out to tenths is it 1.5 or 1.6? I know the people I work with a very intelligent but I was just looking for some guidance on writing a procedure so that we all do it the same.
I just re-read your post and at the risk of sounding too elementary on this, in mathematics, rounding has always been to round down with the last digit being 4 or below and round up if the last digit is 5 or above. 1.04 rounds to 1.0 and 1.05 rounds to 1.1


AJ, yer right on the GDT app, I got bit hard on that one too!
 
A

Al Dyer

#7
I might as well add another log.

In measurement you might need to take the resolution or discrimination ratio of a gage into consideration.

ASD...
 
G

Graeme

#8
Originally posted by ISO GUY:
... What I was looking for is a procedure on rounding numbers, to make sure that the company is all doing it the same way. For example you have 1.55 and you only need to go out to tenths is it 1.5 or 1.6? ... I was just looking for some guidance on writing a procedure so that we all do it the same.
You need to buy a copy of ASTM E29-93a, "Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications". This standard can be purchased as a download or print copy from ASTM ( http://www.astm.org ). The same method is also in ASTM Manual 7, "Presentation of Data and Control Chart Analysis". It also used to be in an old military standard that now appears to be extinct.

Clause 6.4 of E29 covers the rounding rules, which go beyond the 5/4 rule we learned at an early age. Here is a brief summary.
  • When the digit beyond the one you want to keep is less than 5, do not change the digit you are keeping.
  • When the digit beyond the one you want to keep is greater than 5, increase the digit you are keeping by 1.
  • When the digit beyond the one you want to keep is equal to 5 and there are non-zero digits beyond it, increase the digit you are keeping by 1.
  • When the digit beyond the one you want to keep is equal to 5 exactly, and the digit you are keeping is odd, increase the digit you are keeping by 1. If the digit you are keeping is even, keep it unchanged.

This method is slightly harder to learn, and it is hardly ever implemented in calculators or computer programs. However, it does reduce the amount of statistical bias that is introduced by the simplistic 5/4 rounding method.



------------------
Graeme C. Payne
ASQ Certified Quality Engineer
 
#9
Rounding up or down if the last digit is larger or smaller than 5 has been covered. In a previous life I used to use the rule if the last digit was 5 round the number so that the remaining digit was even. This meant that 1.65 would become 1.6 and 1.75 would become 1.8. For a large column of numbers this would mean some numbers rounded up and some rounded down therefor the total wouldn't be skewed one way or the other and would be closer to the real number. Banks round the direction that would help them and calculator/spreadsheets normally round up when the last digit is 5.
 
Thread starter Similar threads Forum Replies Date
A Significant Figures and Rounding SOP Document Control Systems, Procedures, Forms and Templates 4
C SOP unification. Revision No, Revision history Document Control Systems, Procedures, Forms and Templates 4
D Recent changes to ISO 14971 - SOP required for managing standard revisions ISO 13485:2016 - Medical Device Quality Management Systems 1
N Agile SOP for SaMD IEC 62304 - Medical Device Software Life Cycle Processes 3
S SOP for ISO 13485:2016 Quality related Software validation ISO 13485:2016 - Medical Device Quality Management Systems 8
R Is it required to have an SOP for external audits? Medical Device and FDA Regulations and Standards News 7
J Looking for a template SOP for UDI implementation for EU Medical Devices EU Medical Device Regulations 0
B How to apply external voltage to SIP/SOP IEC 60601 - Medical Electrical Equipment Safety Standards Series 2
D Sample Calibration SOP for ISO 13485 General Measurement Device and Calibration Topics 4
J Application of mains voltage on SIP/SOP connectors of medical device IEC 60601 - Medical Electrical Equipment Safety Standards Series 3
Q Software SOP - Use and maintenance of an ERP system Software Quality Assurance 4
M What to do in SOP Phase of Head unit testing? IATF 16949 - Automotive Quality Systems Standard 0
H Should I mention machine/Equipment password In SOP? Qualification and Validation (including 21 CFR Part 11) 4
W SOP examples wanted - Soil, Concrete and Asphalt testing ISO 17025 related Discussions 3
F Linking an ISO 31000 Risk management SOP to ISO 17025 ISO 17025 related Discussions 2
pashah Looking for Clinical Evaluation SOP acc. MEDDEV and EU MDR Other Medical Device Related Standards 0
M SOP Sample for BC/ISO22301 (Business Continuity) wanted Business Continuity & Resiliency Planning (BCRP) 4
M Risk/Benefit vs. benefit-risk - Revising an SOP covering Risk Management with the MDR in mind EU Medical Device Regulations 10
A How to manage the QMS system and SOP during the transition from MDD to MDR EU Medical Device Regulations 4
V Protocol, report or SOP for threshold analysis? Human Factors and Ergonomics in Engineering 0
V Nature of references allowed to be cited in the SOP US Food and Drug Administration (FDA) 2
W SOP for Vigilance reporting covering multiple requirements Document Control Systems, Procedures, Forms and Templates 3
M Charging consulting fees for SOP development and guidance Document Control Systems, Procedures, Forms and Templates 13
J Just Venting - Do you refer directly to MDR or you just refer to SOP's? CE Marking (Conformité Européene) / CB Scheme 3
E CSR SHIPPING - Need suggestions for making SOP/WI for our shipping dept (automotive)... Customer and Company Specific Requirements 11
S Should there be a SOP on Cybersecurity? ISO 14971 - Medical Device Risk Management 1
T The difference between SOP and Kaizen Standardization Lean in Manufacturing and Service Industries 2
J Nonconforming product procedures SOP help :) Nonconformance and Corrective Action 2
G NIST SOP 29 - Assignment of Uncertainty - Question General Measurement Device and Calibration Topics 0
A SOP for software validation of software in medical device IEC 62304 IEC 62304 - Medical Device Software Life Cycle Processes 5
S SOP Training/Competence in 24/7 Operation contractor company ISO 9000, ISO 9001, and ISO 9004 Quality Management Systems Standards 7
K EU MDR - PMS (Post Market Surveillance) SOP - definition of "register(s)" EU Medical Device Regulations 2
A Definition Difference between Quality System Procedure and Standard Operating Procedure (SOP) Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 3
I Video under Document Control SOP ISO 13485:2016 - Medical Device Quality Management Systems 2
J Business Impact Analysis SOP Business Continuity & Resiliency Planning (BCRP) 2
Jane's Do you have an SOP for communicating with regulatory authorities ISO 13485:2016 - Medical Device Quality Management Systems 8
D 21 CFR Part 11 - Electronic Signature Management SOP Other US Medical Device Regulations 0
A AQL Sampling Plan SOP / WI - Medical Device Industry Inspection, Prints (Drawings), Testing, Sampling and Related Topics 14
S Authorized (EC) Representative Contract and SOP EU Medical Device Regulations 12
M SOP or template for a study to Define Storage Conditions of Orthopaedic Implants EU Medical Device Regulations 3
J Does anyone have an example Authority Listing SOP example? Misc. Quality Assurance and Business Systems Related Topics 3
S Clinical evaluation standard operating procedure / SOP for medical devices Document Control Systems, Procedures, Forms and Templates 1
S Medical Device Clinical Evaluation Standard Operating Procedure / SOP Document Control Systems, Procedures, Forms and Templates 11
S Medical Device Clinical Evaluation Standard Operating Procedure / SOP Imported Legacy Blogs 1
S Post Market Surveillance procedure/ SOP Medical devices Imported Legacy Blogs 0
C Regulatory Authority Communication SOP ISO 13485:2016 - Medical Device Quality Management Systems 6
J Training SOP and Forms Training - Internal, External, Online and Distance Learning 3
R Review of "Key Data" for contract labs, but SOP doesn't define "key data". Problem? Pharmaceuticals (21 CFR Part 210, 21 CFR Part 211 and related Regulations) 2
S Medical Device Reporting SOP (Standard operating procedure) example Other Medical Device and Orthopedic Related Topics 1
G SOP or Work Instruction for PFMEA? FMEA and Control Plans 5
Similar threads


















































Top Bottom