Attribute_study_report P Chart Format
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Control Chart for Attribute Data - "Initial Study" Plant
np
P
●
c
u
Part Number
Operation number and Name
Department
Part Name
0.065 0.060 0.055 0.050 0.045 0.040 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0.000 Colum nB
Colum nC
SAMPLE n NUMBER ( np, c ) PROPORTION ( p, u )
Colum nD
Colum nE
500
500
Colum nF 500
Colum nG 500
Colum nH 500
Colum nI
500
Colum nJ
500
Colum nK
500
500
Colum nL 500
Colum nM
Colum nN
500
500
Colum nO
Colum nP
Colum nQ
500
500
500
Colum nR 500
Colum nS 500
Colum nT 500
Colum nU
500
Colum nV
500
Colum nW
500
500
Colum nX 500
Colum nY
Colum nZ
500
500
12
15
19
13
9
26
18
14
17
18
16
24
11
16
10
16
17
20
15
8
13
12
17
18
31
0.024
0.030
0.038
0.026
0.018
0.052
0.036
0.028
0.034
0.036
0.032
0.048
0.022
0.032
0.020
0.032
0.034
0.040
0.030
0.016
0.026
0.024
0.034
0.036
0.062
Date Shift / Time ANY CHANGE IN IN PEOPLE, MATERIAL EQUIPMENT, METHODS, ENVIRONMENT, OR MEASUREMENT SYSTEMS SHOULD BE NOTED. THESE NOTES WILL HELP YOU TO TAKE CORRECTIVE OR PROCESS IMPROVEMENT ACTION WHEN SIGNALLED BY THE CONTROL CHART DATE
TIME
COMMENTS
n1p1+n2p2+………+nkpk n1+n2+….nk
Average proportion nonconfroming p =
p
UCLp
=
0.0324
P+3 P(1-P)/ n
0.0562
=
0.0086
A point below the lower control limit (lower proportion nonconforming) is generally a sign of one or more of the following 1. The control limit or plot point are in error 2. The process performance has improved (this should be studied for improvements that might be incorporated on a parmanent basis) 3. The measurement system has changed
UCLp
=
LCLp
=
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.024
0.030
0.038
0.026
0.018
0.052
0.036
0.028
0.034
0.036
0.032
0.048
0.022
0.032
0.020
0.032
0.034
0.040
0.030
0.016
0.026
0.024
0.034
0.036
0.062
P-3 P(1-P)/ n
=
A point above the upper control limit (higher proportion nonconforming is generally a sign of one or more of the following 1. The control limit or plot point are in error 2. The process performance has worsened, either at that point in time or as part of a trend 3. The evaluation system has changed (e.g., inspector, gauge)
p
0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324
LCLp
0.009
** Green cell only to be filled
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
np
P
●
c
u
Part Number
Operation number and Name
Department
Part Name
0.065 0.060 0.055 0.050 0.045 0.040 0.035 0.030 0.025 0.020 0.015 0.010 0.005 0.000 Colum nB
Colum nC
SAMPLE n NUMBER ( np, c ) PROPORTION ( p, u )
Colum nD
Colum nE
500
500
Colum nF 500
Colum nG 500
Colum nH 500
Colum nI
500
Colum nJ
500
Colum nK
500
500
Colum nL 500
Colum nM
Colum nN
500
500
Colum nO
Colum nP
Colum nQ
500
500
500
Colum nR 500
Colum nS 500
Colum nT 500
Colum nU
500
Colum nV
500
Colum nW
500
500
Colum nX 500
Colum nY
Colum nZ
500
500
12
15
19
13
9
26
18
14
17
18
16
24
11
16
10
16
17
20
15
8
13
12
17
18
31
0.024
0.030
0.038
0.026
0.018
0.052
0.036
0.028
0.034
0.036
0.032
0.048
0.022
0.032
0.020
0.032
0.034
0.040
0.030
0.016
0.026
0.024
0.034
0.036
0.062
Date Shift / Time ANY CHANGE IN IN PEOPLE, MATERIAL EQUIPMENT, METHODS, ENVIRONMENT, OR MEASUREMENT SYSTEMS SHOULD BE NOTED. THESE NOTES WILL HELP YOU TO TAKE CORRECTIVE OR PROCESS IMPROVEMENT ACTION WHEN SIGNALLED BY THE CONTROL CHART DATE
TIME
COMMENTS
n1p1+n2p2+………+nkpk n1+n2+….nk
Average proportion nonconfroming p =
p
UCLp
=
0.0324
P+3 P(1-P)/ n
0.0562
=
0.0086
A point below the lower control limit (lower proportion nonconforming) is generally a sign of one or more of the following 1. The control limit or plot point are in error 2. The process performance has improved (this should be studied for improvements that might be incorporated on a parmanent basis) 3. The measurement system has changed
UCLp
=
LCLp
=
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.056
0.024
0.030
0.038
0.026
0.018
0.052
0.036
0.028
0.034
0.036
0.032
0.048
0.022
0.032
0.020
0.032
0.034
0.040
0.030
0.016
0.026
0.024
0.034
0.036
0.062
P-3 P(1-P)/ n
=
A point above the upper control limit (higher proportion nonconforming is generally a sign of one or more of the following 1. The control limit or plot point are in error 2. The process performance has worsened, either at that point in time or as part of a trend 3. The evaluation system has changed (e.g., inspector, gauge)
p
0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324 0.0324
LCLp
0.009
** Green cell only to be filled
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
0.009
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