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About

How We Calculate Colour Depth

Rules, thresholds and weights

Rule Threshold Domain score weighting
1 Funnel Plot (cross sectional view at latest data period). A data point is outside the 3SD limit 0.5

A data point is outside the 2SD limit

NB. This is an OR. You either score 0.5 or 0.25, but never both. (0.5 takes precedence)
0.25
2 Trend (longitudinal view over latest 12 date periods). A data point is outside the 3SD limit 0.2
3 Trend (longitudinal view over latest 12 date periods). 2 consecutive data points outside the 2SD limit 0.15
4 Trend (longitudinal view over latest 12 date periods). 6 consecutive data points moving upwards or downwards 0.1
5 Trend (longitudinal view over latest 12 date periods). 8 consecutive data points above or below the average 0.05

Creating the colour depth

For each domain within an organisation we follow these steps:

  1. Sum the scores for each indicator in that domain based on the SPC outlier methodology
  2. Divide by the number of indicators in the domain to give a score out of 1
  3. Transform this zero to 1 score into a percentage of the maximum score for the domain and calculate (%MaxScore - Average)/1-Average to give a score up to 1. This shows how far from the average a trust is (if they are below the average this will be negative)
  4. Apply the colour so that any Trust that has below average variation for the domain shows as white and colour depth increments based on an 8 point scale using the table below.
Domain weight Colour depth
< 0 0
0 – 0.36 1
0.36 – 0.66 2
0.66 – 0.83
0.8 – 0.94
0.9 – 0.955
0.95 – 0.9986
0.998 – 17