Help needed in confirming MPT fund v benchmark calculations

Hi to you all,

I am currently running a project of adding some of the MPT calculations to the database and I need some help in getting the figures approved so to speak as they don't look right to me,

Attached excel has 5 tabs which are split as following:

data - contains data on a test fund and benchmark over 3 years
returns - contain calculated daily returns of the fund and benchmark and also show difference in performance between these two
cumret_cal - contains again daily performance returns and cumulative
calc - contains a performance calculation table over different periods
results - contains results I got for 12 measures

I need help in getting these figures validated as it certainly looks to me that some calculations are not correct.

Any help would be most welcome.

Alex