The Charts tab

The menu on the left fine-tunes the chart: its controls change with the chart chosen. The chart area shows the chart, its statistics and how it’s worked out.

Chart menu: Precision

The chart menu for a Precision scatter chart, each control numbered

  1. Point size: The size of the points on the chart.
  2. Chart: The chart type. Each QC type has its own list, from scatter and RD charts to Thompson-Howarth.
  3. Threshold factor: Multiplies the detection limit (LLD) to give a threshold. Pairs below it are greyed out and left out of the statistics and control lines.
  4. Apply upper detection limit: Leaves out pairs where either result exceeds the upper detection limit (only where the data gives one).
  5. Use SQC to detect outliers: Uses statistical control (the 3 SD action limit; the 2 SD warning band is also shown) instead of the manual control lines to find outliers.
  6. Control line (%): The relative difference (%) the manual control lines are drawn at.
  7. Facet by check stage: One panel per check stage, side by side.

Chart menu: Accuracy

The chart menu for an Accuracy Shewhart chart, each control numbered

  1. Point size: The size of the points on the chart.
  2. Chart: The chart type: Shewhart, CUSUM, EWMA, Z-Score and more.
  3. Use CRM provided statistics: Builds the control lines from the CRM’s certified value and standard deviation, instead of the ones computed from the results.
  4. Run Nelson 8 rules: Flags runs and trends that suggest the process is out of control, with a table of which rules were broken.
  5. X axis: What runs along the bottom: Lab Job No, Despatch No, Check ID or Date.
  6. Show colour bands: Shades the bands: within the 2 SD warning limits (green), between warning and 3 SD action limits (amber) and beyond (red).

Chart area

A scatter chart with its title, menu, plot, legend, method link and statistics numbered

  1. Title: The chart, laboratory and analyte, with the check stage (or CRM) and dates underneath.
  2. Chart menu: Full screen, print, and download as an image or the data behind it.
  3. The chart: Point at a result to see its details.
  4. Legend: Click an item to hide or show it.
  5. How this is calculated: The method behind the chart, with this chart’s own numbers.
  6. Statistics: The chart’s statistics, with notes on what they mean - how many outliers to expect, for example.