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By Charles Flock on 4/23/2015 3:18 PM
There are a lot of financial calculations that compute 'returns'. There are internal rates of return, return on investment, time-weighted rate of return, multiples of invested capital, compound annual growth rate, and many more. The good news is that you can perform all these calculations in SQL Server using XLeratorDB. In this article we explore the difference between the two return calculations that we get the most questions about: internal rate of return and total return. You won't need an MBA in Finance to understand these examples; just follow along with SQL Server Management Studio and you will very quickly see how these calculations differ.
By Charles Flock on 4/10/2015 12:42 PM

XIRR is one of XLeratorDB's most popular financial functions. At Westclintech, we get more inquiries about XIRR than all of the other 200+ financial functions combined. To create a reliable version of XIRR for SQL Server we had to create, quite literally, millions of different test cases which were then tested against Excel.

One technique for creating test cases was to generate all the cash flows except the first one, then make the first cash flow equal and opposite in sign to the discounted cash flow value, or net present value, of all the other cash flows at some discount rate and check to if the internal rate of return, as calculated by the Excel XIRR function, is equal to the discount rate.

Mathematically that technique is absolutely sound, yet we discovered that Excel was not at all reliable in producing the expected result. In this article we share with you what we found.

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