ANnual Buy and hold monthly return and standard deviation.

Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

For example,

  • A snippet of your dataset would be helpful. How to do that.
  • It's not clear to me what those columns are indicating.
  • It would also be helpful to be a little more clear on what you mean by "annual buy and hold monthly return and sd" given the structure of the data.