I have a very simple regression model and I am doing the cross validation. When cv=10 the highest score i got is 60.3 and lowest is -9.7 which is useless. Average will be 30.
No of row data set= 658
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Your $R^2$ scores indicate that a linear model does not describe your data well. On top of this, there seems to be a large variability in data. You could try the following: