Analysis by Fourier Series from S&P 500 Index

I am test the analysis of Fourier Series in S&P 500 Index some times I have very good results in forecast. The prediction at future is short in time and It´s bad predictor when there ispolitic effect on markets. I fixed two model, exponencial with tend to up and damped:

s3.amazonaws.com/tradingview/snapshots/3/3PQHOcrs.png
forecasts&p500shortTechnical Analysistimeseriesanalysis

Disclaimer