GIPS- 2.A.2 performance calculation

Hi, 2 questions regarding the GIPS standard 2.A.2 on performance calculation.

  1. Why is the MIRR method considered as a TWRR? It seems to me that it is exactly the same as the MWRR defined in SS 17

  2. I understand that only daily valuation method is acceptable since 1 Jan 2010. So this means that portoflio must be valued at the time of ALL cash flow and not only at the date of large cash flow, right? So this supercede 1.A.3, am i correct?



I’m not sure I know what you’re referring to in your 1st question.

I think I can help with the 2nd question though: Per 2.a.2, performance must be calculated adjusting for “day-weighted” external cash flows, as in the Modified Dietz method. This does not mean that a portfolio must be re-valued on a daily basis in the performance return. Here is an example to illustrate:

Date Value Cash flow 12/31/14 500,000 1/15/15 505,000 -50,000 1/31/15 475,000

As you can see from the data here the daily valuation method isn’t possible. However, per the handbook, performance can be calculated properly using only this amount of data.

Modified Dietz: This would be used if the 50,000 did not meet the “large cash flow” threshold.

Return = (475,000 - 500,000 - (-50,000)) / (500,000 + (-50,000 * .516)) = 5.27%

^The .516 is the adjustment for the “day-weighted” cash flow. (31-15/31)

Large Cash Flow Valuation Method:

Return Jan 1-15 = (505,000 - 500,000) / 500,000 = 1% Return Jan 16-31 = (475,000 - 455,000) / 455,000 = 4.4% Return Jan = (1.01 x 1.044) - 1 = 5.44%

I think question 1 refers to Linked IRR (LIRR), not MIRR.

For question 1. I’m refering to the standard 2.a.2 which states that only TWRR method is acceptable. Then it describes 4 TWRR methods:

  1. Original dietz - not acceptable after 2005

  2. Modified dietz - not acceptable after 2010

  3. Modified IRR method - not acceptable after 2010

  4. Daily valuation method - acceptable after 2010

my question is why the method 3 modified IRR method is a TWRR? To me looks it looks exactly the same as the MWRR formula shown in SS17.

The Modified IRR method adjusts for the timing of CFs, making it an estimate of TWRR. Also, it is my understanding that firms must have the ability to value portfolios on a daily basis, but only must actually re-value on the date of large cash flows.