Newey-West adjusted

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Newey-West adjusted

Satyen Dubey
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Hi All,

Can any one please guide me how do i get Newey-West adjusted ttest for difference in mean and median? In my data i have ten groups based on their extent of using derivatives. So Group 1 is with the lowest usage of derivatives and group 10 is highest usage of derivatives. Now i want to compare the mean difference of these groups.

Thanks in advance.

Thanks & Regards,

Satyen Dubey