We found that sample splitting, cross-validation without replication, and leave-1-out cross-validation produced optimism-adjusted estimates of the C statistic that were biased and/or associated with greater absolute error than other available methods.
Stalled toward the end of her term on the island, Stevens consults the outline she produced with optimism weeks earlier, only to find that under the heading "Climax & Resolution" she has written the useless injunction: "Work this out!
While there was a tenuous relationship to a UI experience, the success of a project that had been demonstrated in an earlier open event at Digg headquarters produced palpable optimism that real progress was being made.
Pressure on health services normally reduces in summer, often producing undue optimism about how they will cope come winter and delaying necessary preparations.
What produces this optimism has however been debated.
He certainly seems to be backing that statement up, with the launch of the Kindle Fire producing more optimism than the last ten non-iPad tablet launches combined.
While the results are quite preliminary, they did produce some optimism in the cancer research community.
In line with cognitive dissonance, this produces unrealistic optimism.
His eternal optimism produced only financial disaster.
As can be seen from the chart, good times in recent years have produced less net optimism than in previous cycles, while bad times have brought more pessimism.
But meetings among African leaders, rebel commanders and nations with combatants in the region, the scene of Africa's widest war, have produced some new optimism.
