XIRR incorrect values for very large datasets

[harzkr]

XIRR value is being calculated incorrectly for transactions of order 40k-50k, the incorrectness increases when the number of transactions increase say 80k-90k

This I had checked with other xirr packages which were returning the same value as well as Excel, which confirmed the calculations. The value calculated by this package was incorrect

[jadfls]

I can confirm this issue. Sample code:

const Finance = require('financejs');
var finance = new Finance();
var start = new Date(Date.parse("2013-12-31"));
var end = new Date(Date.parse("2014-05-15"));
var irr = finance.XIRR([-37987348, 21191041], [start, end], 0);
console.log(irr);    //will not calculate

However, if you (somehow) correctly guess the initial guess close to the result, it will work.

var irr = finance.XIRR([-37987348, 21191041], [start, end], -0.8);
console.log(irr);    //-79.36

@harzkr did you find a solution to your problem?

[harzkr]

Hi @jadfls

Nice find on the guess value part that you mentioned, but yeah it does pose the difficulty of correctly assuming an initial close value.

I have kept the usage of this package limited to any fallback calls(if others fail), and have shifted my primary package to webcarrot/xirr, which is based on the XIRR function call from the LibreOffice Software

Since it is closely associated with the MS Office Excel etc., softwares, it correctly calculates values for 99.9% of the use cases, for others, there's usually a problem with improper set of transactions, else, I use fallback calls to this and other XIRR packages to get a value. But mostly those are very corner cases