Real author:

klot

The indicator exemplifies smoothing of price time series of the MFI indicator by means of filtration of harmonics of a greater order.

This approach can be applied for smoothening any indicators' values. The main advantage of the method is a real absence of a delay.

Indicator input parameters:

//+----------------------------------------------+
//| Indicator input parameters                   |
//+----------------------------------------------+
input uint                MFIPeriod=14;           // Averaging period
input ENUM_APPLIED_VOLUME VolumeType=VOLUME_TICK; // Volume 
input uint N = 7;                                 // Series length
input uint SS = 20;                               // Smoothing coefficient
input int Shift=0;                                // Horizontal shift of the indicator in bars

where:

• N specifies series length (power of two);
• SS - A smoothening coefficient in the resulting spectrum zeroes out frequency ratios exceeding set value. SS cannot exceed 2^N. MFI series fully repeats itself if SS = 2^N.
  

https://www.mql5.com/ru/code/7000 library is required for the indicator operation.

Fig.1. i-SpectrAnalysis_MFI Indicator