Non-Parametric Statistics Variables
Variables to resolve Non-Parametric statistics are differentiated from the same variables which resolve statistics for data using the Normal Distribution method. Process capability variables are grouped according to how their statistical calculation methods are determined:
- Values Affected by the Non-Parametric Statistics Flag (NPS) - These variables use either the Normal Distribution or the Non-Parametric calculation method, based on the value of the Non-Parametric Statistics flag.
- Normal Distribution (ND) Variables - These variables always use the Normal Distribution calculation method, regardless of the NPS flag setting.
- Non-Parametric (ISO) Variables - These variables always use the Non-Parametric calculation method, regardless of the NPS flag setting.
| Method Based on NPS Flag | Normal Distribution (ND) | Non-Parametric (ISO) |
| ~Pp~ | ~Pp,Nd~ | ~Pp,Iso~ |
| ~Ppk~ | ~Ppk,Nd~ | ~Ppk,Iso~ |
| ~Ppu~ | ~Ppu,Nd~ | ~Ppu,Iso~ |
| ~Ppl~ | ~Ppl,Nd~ | ~Ppl,Iso~ |
| ~Process,Pp~ | ~Process,Pp,Nd~ | ~Process,Pp,Iso~ |
| ~Process,Ppk~ | ~Process,Ppk,Nd~ | ~Process,Ppk,Iso~ |
| ~Process,Ppu~ | ~Process,Ppu,Nd~ | ~Process,Ppu,Iso~ |
| ~Process,Ppl~ | ~Process,Ppl,Nd~ | ~Process,Ppl,Iso~ |
| ~Pisol~ | ||
| ~Pisou~ | ||
| ~SpreadIso~ |
For more information on the NPS Flag, see the topic Non-Parametric Statistics.
For more information on Process Variables, see the topic Process Capability and Overall Performance Variables.
~pp,iso~
Returns Pp calculated with the Non-Parametric method on Tol (Tolerance).
~process,pp,iso~
Returns Pp of the process baseline calculated with the Non-Parametric method on Tol (Tolerance).
~ppk,iso~
Returns Ppk calculated with the Non-Parametric method on Tol (Tolerance).
~process,ppk,iso~
Returns Ppk of the process baseline calculated with the Non-Parametric method on Tol (Tolerance).
~ppl,iso~
Returns Ppl calculated with the Non-Parametric method on Tol (Tolerance).
~process,ppl,iso~
Returns Ppl of the process baseline calculated with the Non-Parametric method on Tol (Tolerance).
~ppu,iso~
Returns Ppu calculated with the Non-Parametric method on Tol (Tolerance).
~process,ppu,iso~
Returns Ppu of the process baseline calculated with the Non-Parametric method on Tol (Tolerance).
~pisol~
The Lower Percentiles of the specified distribution for Non-Parametric calculations.
- PisoL = P0.0135 = 0.0135th percentile of the process data
~pisou~
The Upper Percentiles of the specified distribution for Non-Parametric calculations.
- PisoU = P99.865 = 99.865th percentile of the process data
~spreadiso~
The difference between the Upper and Lower percentiles (PisoU - PisoL).
- SpreadISO = P99.865 - P0.0135
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