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9. Control charts



Predictive tool.

•

Definition:



monitor processes over time.



a centerline



2 statistical control limits

(based on the natural variation of

the process).



Monitor process and maintain under control;

•

Objectives:



To take decisions on the process.

Part 1

:

Introduction to

SPC

Part 2

:

Essential

concepts to

start with SPC

Part 4

Conclusion

Part 3

:

SPC in

practice

A

NALYZE



Adjustments

only

when necessary and with caution not to over adjust.

Carte de contrôle des valeurs individuelles

-1,5%

-1,0%

-0,5%

0,0%

0,5%

1,0%

1,5%

2,0%

2,5%

3,0%

0

10

20

30

40

Patient number

Individual Value (%)

X

Control limit

Mean

Monitored parameter

Data (chronological order)

Control limit

22



Use of STATISTICAL CONTROL LIMITS to detect

special causes

that disturb the process

before

the results

are out of the specifications.

03/10/17