Whilst researching the theoretical framework of my thesis, I discovered a paper that already uses extremely similar methods to the ones that I was planning on using for one of my hypothesis, and that also uses almost the same sample. The research was made in 2008, is it thus ethical to go on with my research knowing that the data from 2008 to 2017 is now available and could make a difference?

Do I have to notify the author about this?

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