Analysis by Fourier Series from S&P 500 Index

FX:SPX500   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:

New tendecy forecast by times series for this week:

Today is the fifth day with very good forescast by time series, yesterday almost in 100% the forescast, the forescast started to be good for low prices but is not trust for top price for the actual tend.
Third day, the forecast with times series used model damped exponential model, is good, but there is sekwed to low extrems.

Update forecast by times series for S&P 500 Index, the model is multiplicative in version exponential damped with 1500 lags, the arrows are variations of prices.
The confidence intervalo is more or less six units since line.
Yes, I am not expert on the stock market, but Ihave two year or more with the study of time series on S&P 500 Index, and I have good forescast fixed model in short time. My analysis was made with sofware Statistical ver 7, the data was obteined the Yahoo Finances, first I search about the lags with technical periodograma, I find in 400, next I observed the tend is more or less exponential,Next I made fixes to find less SMA (Squater Median Average from Error). I found two models with less error, The firts model was exponencial, mulplicative, with 1500 lags. The secound was exponencial and damped tend, multiplicative with 1500 lags.
Hey. Can you elaborate a bit on your analysis ? Just being curious but I can't read anything out of your chart, not an expert at fourier series for stock markets
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