XIRR python implementation of XIRR Related Links: Microsoft's XIRR documentation: https://support.microsoft.com/en-us/office/xirr-function-de1242ec-6477-445b-b11b-a303ad9adc9d XIRR relationship to annaul percentage rate (APR): https://answers.microsoft.com/en-us/msoffice/forum/all/how-to-interpret-the-output-of-xirr-function-in/f7372b55-328b-46a8-8a8e-968616e77b1d Java-xirr: https://github.com/RayDeCampo/java-xirr