Investigating stratification

It is often beneficial to dig deeper into the problems to find other factors that may be causing the issues.

  1. On the Analyse-it ribbon tab, in the Report group, click Goto dataset.

    The dataset worksheet is activated.

  2. On the Analyse-it ribbon tab, in the Statistical Analyses group, click Pareto, and then click Comparative Pareto Chart.
  3. In the Variable drop-down list, select Failure.
  4. In the Frequency drop-down list, select Downtime.
  5. In the Factor (row) drop-down list, select Operator.
  6. Select the Label frequencies and Frequency table check boxes.
  7. Click Calculate.
    The results are calculated and the analysis report opens.

The Pareto plots show the amount of downtime stratified by the operator of the machine.

Comparative Pareto charts(click to enlarge)

Operator JDH spends more time dealing with colorimeter drift than the other operators. It is decided to implement increased operator training in re-calibrating the machine to try reduce the downtime.