The performance score of these Cox models was evaluated using the area under the staircase receiver operator characteristic curves (AUCROC) at the time of each event in the testing set and we averaged these AUCROCs across all these events.
The medals are then awarded based on the cumulative total across all eight events.
Well-rounded skills across all events are at a premium in the team competition.
Perryman said: "Locog said they made 28% of 8.8m tickets £20 or less but won't reveal whether that is spread across all events.
The final batch of 1.2m tickets across all events will go on sale in April, with those who failed to secure tickets in earlier sales rounds given priority.
To avoid the counting-threshold problem, analysts often turn to metrics that integrate across all events — for example, the total damage costs (or alternatively the total insured losses) that natural disasters impose on the insurance industry in a given year.
The Locog chief executive, Paul Deighton, said he was "disappointed" that the system fell down but promised his organisation would learn from its mistakes ahead of the final phase of sales, when there is expected to be a stampede for the final 1.3m tickets across all events.
Her coach Mike Holmes said: "Much of the preparation necessary to compete across all events has been lost".
