¥Accuracy measures the closeness of a forecast value
to a verifying observation
¥ Accuracy
can be measured by many metrics
¥Skill compares the accuracy of a forecast against the accuracy of a competing
forecast
¥ A
forecast must beat simple competitors:
¥Persistence,
Climatology, Random, etc.
¥ If
forecasts consistently beat these competitors, then the forecasts are said to be ÒskillfulÓ