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What's killing trees during droughts? Scientists have new answers（图）
killing trees during droughts Scientists new answers
2017/9/4
As the number of droughts increases globally, scientists are working to develop predictions of how future parched conditions will affect plants, especially trees.New results published today in the jou...
Unemployment and Crime: New Answers to an Old Question
regional panel data fixed effects clearance rate
2013/10/17
This paper uses panel data techniques to examine the relationship between unemployment and a range of categories of crime in New Zealand. The data cover sixteen regions over the period 1984 to 1996. R...