I also tried to use excel to calculate this Estimates within-subgroup standard deviation but it is not same with Minitab. I also present my calculation in attached file.

Could you please help me to review and advise if my excel formulas are wrong somewhere?

P/S: sorry I cannot post link yet.

Link:

Code:

`<https://docs.google.com/spreadsheets/d/1j7ilxfFoTlvXwTyVwZ4pDmls3upWpPmE/edit?usp=sharing&ouid=104152310496939595760&rtpof=true&sd=true>`

Code:

`< https://support.minitab.com/en-us/minitab/help-and-how-to/quality-and-process-improvement/capability-analysis/how-to/capability-analysis/normal-capability-analysis/methods-and-formulas/methods/#estimating-standard-deviation`