The Chart Over The Range (R); The Statistics Table - sylvac D300S V2 Manuel D'utilisation

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The chart over the range (R)

Values beyond the control limits are indicated in red.
Values within the control limits are indicated in green.

The statistics table

S (standard deviation) = population standard-deviation based on a sample :
-
-3s : V 3s (lower regulation or intervention limit)
-
+3s : 3s (upper regulation or intervention limit)
V
-NG : amount of recorded measures below the lower tolerance limit
+NG : amount of recorded measures above the upper tolerance limit
^ h + + ^
-
NG
%Def :
N
h
NG
(percentage of faulty measures)
100
$
UCL : Upper control limit
D * R, with D =2.114 for n=5
4 4
LCL : Lower control limit
D * R, with D =0 for n=5
3 3
N : the amount of recorded values
Xmax : maximum recorded value
Xmin : minimum recorded value
R (Range) : Xmax – Xmin
Xbar (average) :
N 2
-
(X X)
/
i
=
i 1
N
/
22
N
X
/
i
=
i 1
N
N
2
-
(X X)
i
=
i 1
N-1