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This study calculates and displays a Money Flow Index (MFI) for the Price Data. The MFI is a momentum indicator that measures the strength of money flowing in and out of a security. It is related to the relative Strength Index (RSI), but whereas the RSI incorporates only prices, the MFI accounts for volume.

The MFI makes use of the notion of a Typical Price. We denote the Typical Price at Index \(t\) as \(P^{(Typ)}_t\), and we take this to be the average of the High \(H\), Low \(L\), and Close \(C\) Prices at Index \(t\). We state this symbolically as follows.

Let \(V_t\) denote the Volume at Index \(t\). We denote the Raw Money Flow, Positive Money Flow, and Negative Money Flow at Index \(t\) as \(RMF_t\), \(MF^{(+)}_t\), and \(MF^{(-)}_t\), respectively, and we compute them as follows.

Let \(n\) denote the Length Input. Then we denote \(n\)-period Positive and Negative Money Flows as \(MF^{(+)}(n)_t\), and \(MF^{(-)}(n)_t\), respectively, and we compute them as follows.

We denote the Money Flow Ratio at Index \(t\) as \(MFR_t(n)\), and we compute it as follows.

Finally, we denote the Money Flow Index at Index \(t\) as \(MFI_t(n)\), and we compute it as follows.