The Daisy Chart shows the delays on the various lines of the London Underground for March 1996.

The data has been analysed into three sets of nodes, each of which is shown as an arc. These are the line, the day of the week and the area that caused the delay.

Two histograms are shown on each node; the green shows the Number of Incidents and the cyan the Total Delay in Minutes.

At a first glance, it would appear that there were serious delays on the Jubilee Line on Mondays, involving stations and safety. By using the mouse to select the delays involved, it was found that they were due to the closure of two stations because of unsafe floors for several hours. This. although more than an inconvenience to passengers at those locations, did not cause any danger or affect the overall running of the network.

Other strong links show power and track problems on the Northern Line. These are currently being addressed in a multi-million pound total re-equipment of the line.

Note that most of the other links are weak, which indicates that delays are of a random nature and not due to systematic management, staff and equipment failures.

This example has been setup to be printed as portrait.

It is recommended that the example is redrawn with the chart size set to Printer Portrait and High Resolution before it is actually printed.