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Excel File Finds Multiple Sine Curve Cycles Embedded in Stock Price Data using the Discrete Fourier Transform. All Calculations Performed With Cell Formulas Without the Use of VBA The dominant waves have the largest amplitudes. The chart extrapolates the sine waves past the last data point to provide a guestament of future prices I will email you the DFT spreadsheets consisting of a data sheet and the main DFT file with the chart shown to the left. Direct any questions to [email protected]