Quality Management 2017

A NALYZE

Control chart: Calculation of control limits

Tables of constants to calculate control limits

Constants used for control charts' limits calculation

Estimation of Standard deviation 

D

A

D

d

d

n 2 3 4 5 6 7 8 9

n 2 3 4 5 6 7 8 9

4

4

3

2

3

2,659 1,772 1,457 1,290 1,184 1,109 1,054 1,010 0,975 0,946 0,921 0,899 0,881 0,864 0,803

- - - - -

3,267 2,574 2,282 2,114 2,004 1,924 1,864 1,816 1,777 1,744 1,717 1,693 1,672 1,653 1,585

1,128 1,693 2,059 2,326 2,534 2,704 2,847 2,970 3,078 3,173 3,258 3,336 3,407 3,472 3,735

0,853 0,888 0,880 0,864 0,848 0,833 0,820 0,808 0,797 0,787 0,778 0,770 0,762 0,755 0,729

0,076 0,136 0,184 0,223 0,256 0,283 0,307 0,328 0,347 0,415

10 11 12 13 14 15 20

10 11 12 13 14 15 20

n = number of data used to calculate the moving-range

03/10/17

24