What is SPC?

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SPC Tools – Empirical Rule Chart, PP and PK Fallout Rates

Looking for convenient SPC tools? Take a look at our SPC Pocket Card which contains additional resources, including empirical rule chart and Ppk fallout rates, and keep it handy for future reference.

SPC Tools

Monitor your quality control process with advanced SPC tools. Use an empirical rule chart, Pp and Ppk Fallout Rates tables and more control charts. InfinityQS Proficient delivers many SPC tools for businesses in need of process optimization and quality control. The following charts serve as additional SPC tools and resources, including Pp and Ppk fallout rates, control chart constants, empirical rule chart, capability study and capability formulas.

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Pp and Ppk Fallout Rates

Calculated Capability Ratio Pp Fallout
(both sides combined)		 Ppk Fallout
(one side only)
0.50
0.60
0.70
0.80
0.90
1.00
1.10
1.20
1.30
1.40
1.50
1.60
1.70
1.80
1.90
2.00		 133,620
71,860
35,730
16,396
6,934
2,700
966
318
96
26
7
2
0.340
0.060
0.012
0.002		 66,810
35,930
17,865
8,198
3,467
1,350
483
159
48
13
3
1
0.170
0.030
0.006
0.001

Control Chart Constants

X and R Control Charts X and S Control Charts
n A2 D3 D4 d2
1
2
3
4
5
6
7
8
9
10
11
12		 2.660
1.880
1.023
0.729
0.577
0.483
0.419
0.373
0.337
0.308
0.285
0.266		 –
0
0
0
0
0
0.076
0.136
0.184
0.223
0.256
0.283		 –
3.267
2.574
2.282
2.114
2.004
1.924
1.864
1.816
1.777
1.744
1.717		 –
1.128
1.693
2.059
2.326
2.534
2.704
2.847
2.970
3.078
3.173
3.258
n A3 B3 B4 C4
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25		 0.975
0.927
0.886
0.850
0.817
0.789
0.763
0.739
0.718
0.698
0.680
0.663
0.647
0.633
0.619
0.606		 0.284
0.321
0.354
0.382
0.406
0.428
0.448
0.466
0.482
0.497
0.510
0.523
0.534
0.545
0.555
0.565		 1.716
1.679
1.646
1.618
1.594
1.572
1.552
1.534
1.518
1.503
1.490
1.477
1.466
1.455
1.445
1.435		 0.9727
0.9754
0.9776
0.9794
0.9810
0.9823
0.9835
0.9845
0.9854
0.9862
0.9869
0.9876
0.9882
0.9887
0.9892
0.9896

Special Cause Rules

Empirical Rule

Capability Study

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ProFicient™, the leading real-time Quality Management solution, goes beyond typical site-based quality applications by offering an enterprise-ready architecture and statistical process control. Still have questions or need help with SPC tools? Contact us today for more information about our SPC software. It’s time to re-imagine your quality control process.

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