20227
Here , we show that time - split selection gives an R ( 2 ) that is more like that of true prospective prediction than the R ( 2 ) from random selection ( too optimistic ) or from our analog of leave - class - out selection ( too pessimistic ) .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None