Study design

Process control and capability analysis study requirements and dataset layout.

Requirements

  • A categorical or quantitative variable.
  • A stratification variable.
  • A subgroup variable.
  • A phase/stage variable.

Dataset layout for individuals or fixed subgroup size

Use a column for each variable (Copper); each row has a single measurement.

Copper
7.96
8.52
9.24
7.96
10.04
8.68
7.46
8.84
8.9
9.28

Advanced dataset layout with statification and phases

Use a column for each variable (Copper), and optionally columns for subgroup (Day), stratification (Operator), phase/stage (Phase); each row has a single measurement.

Day (optional) Operator (optional) Phase (optional) Copper Comments (optional)
1 SNH IQ 7.96  
1 SNH IQ 8.52  
2 JDH IQ 9.24  
2 GMH IQ 7.96  
3 SNH IQ 10.04 Electrode failure
3 SNH IQ 8.68  
IQ  
20 JDH OQ 8.68  
20 SNH OQ 8.76  
21 JDH OQ 8.02  
21 GMH OQ 8.7  
OQ  

Frequency form dataset layout

Use a column for each subgroup (Sample), a column for the subgroup size (Sample size), and a column for the number of cases (Frequency); each row has a the frequency count for each sample.

Sample Sample size Nonconforming units
1 100 7
2 80 8
3 80 12
4 100 6
5 110 10
6 110 12
7 100 16
8 90 10
9 90 6
10 120 20
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