calculate r square (Multiple determination coefficient) using GBM in R

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I perform GBM models. Data sample

a=structure(list(yield = c(1842L, 2147L, 2444L, 3850L, 1866L, 2897L, 
1783L, 2434L, 2650L, 2863L), time.diff = c(122, 186, 177,


                      
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