No, I am saying that the numbers posted by lots of people in these threads are neither precise nor accurate. For myself, I don't post my YTD numbers, but I might mention if I am ahead or behind my benchmarks. In this thread, I think the numbers I posted for the Vanguard funds are accurate and precise as of the day I noted. The number for DGSIX is not right.
As for my "lots of people" comment, I have noticed over the last 10 years that many people don't know how to calculate their portfolio performance in a common legitimate manner. That is, they don't calculate it like Vanguard.com does nor like Morningstar.com both of which use the same method of the XIRR algorithm found in MicroSoft Excel. And if even they used that algorithm, they leave out things such as their cash, or their play account. Or they include only one account like "my IRA" or "my 401(k)" or their "account with the best performance if I leave out that stock that I lost money on." You know what I mean even if the Beardstown Ladies didn't know.
I have accounts that hold single funds and get no transactions except autoreinvesting dividends. My calculations always show the exact same performance as Vanguard.com and Morningstar.com show for them.