Risk free rate in Sharpe for a strategy

General
1

how should I take into account the risk free rate while calculating the Sharpe ratio of a strategy that was backtested over 15 years of data?

If I consider the risk free rate as of today i.e. ~6.5% then that would not be a good way to go about it. Any suggestions will be helpful.

Thanks

2

There is no right way to consider this.

you could take the average or weighting average over the past data.

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