Statistical Process Control Variables

Stats Variables

~statsmode~

Returns the name of the applied Statistics Rule:

§        ATS (Default)

§        Ford

§        Saab

§        Volvo Cars

~stddev~

Returns the calculated standard deviation of a DataSet row.

~stddev,t~

Returns the standard deviation target.

~stddev,e~

Returns the estimated standard deviation.

~+3stddev~

Mean plus (the standard deviation time three).

~-3stddev~

Mean minus (the standard deviation time three).

~6stddev~

Standard deviation of a row times six.

~subgroup~

Returns the subgroup size.

~sum~

Sum (accumulation) of all valid values within a DataSet row.

~skewness~

Measure of symmetry of distribution.

Range

~range~

Range (highest - lowest) of valid values within a DataSet row.

~rstat~

The "rstat" variables calculate various statistics on the reference features of a Range feature. Range statistics are calculated per sample for all reference features.

~rstat,count~

Returns the number of Range features that are in the DataSet.

~rstat,hi~

Returns the highest value in the range of deviations.

~rstat,lo~

Returns the lowest value in the range of deviations.

~rstat,mean~

Returns the mean value of the range of deviations.

~rstat,stddev~

Returns the standard deviation within the range of deviations.

~rstat,ppk~

Returns the Ppk value of the range of deviations.

Quartile Variables

~iqr~

Inter Quartile Range (q3-q1).

~lif~

Lower Inner Fence (q1 - 1.5 * iqr).

~lof~

Lower Outer Fence (q1 – 3.0 * iqr).

~q1~

Quartile 1 value, i.e., Lower Quartile.

~q2~

Quartile 2 value, i.e., Median.

~q3~

Quartile 3 value, i.e., Upper Quartile.