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

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 : (lower regulation or intervention limit)
3s
V
+3s : - (upper regulation or intervention limit)
3s
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) :
σ (sigma) = standard-deviation:
N -
2
/
(X X)
i
=
i 1
N
/
22
N
/
X
i
=
i 1
N
N - 2
(X X)
i
=
i 1
N-1