Quantitative Analysis · Data Science · Machine Learning

# Money Flow Index – MFI

## What is the Money Flow Index?

The Money Flow Index (MFI) is a technical analysis indicator that combines price and volume data to identify buying and selling pressure. It is used to assess the strength of a trend and to identify potential buying or selling opportunities.

The MFI is calculated using the following steps:

1. Calculate the typical price for each period (the typical price is the average of the high, low, and close for the period).
2. Calculate the money flow for each period (the money flow is the typical price multiplied by the volume for the period).
3. Calculate the positive and negative money flow for each period. Positive money flow is the money flow for periods where the typical price is higher than the previous period’s typical price, and negative money flow is the money flow for periods where the typical price is lower than the previous period’s typical price.
4. Calculate the money flow ratio (MFR) for each period. The MFR is the positive money flow divided by the negative money flow.
5. Calculate the MFI by dividing the sum of the positive money flow for the periods by the sum of the negative money flow for the periods, and then multiplying the result by 100.

The MFI is plotted as a line on a chart and is usually displayed with a range of 0 to 100. A high MFI value (above 80) is considered to be overbought, and a low MFI value (below 20) is considered to be oversold. Some traders may use these levels as potential buy or sell signals.

The formula to calculate the Money Flow Index (MFI) is as follows:

### MFI = 100 – (100 / (1 + MFR))

where MFR is the money flow ratio, which is calculated as follows:

### MFR = Sum of positive money flow / Sum of negative money flow

To calculate the positive and negative money flow, you first need to calculate the typical price for each period (the typical price is the average of the high, low, and close for the period). Then, you can calculate the money flow for each period (the money flow is the typical price multiplied by the volume for the period). The positive money flow is the money flow for periods where the typical price is higher than the previous period’s typical price, and the negative money flow is the money flow for periods where the typical price is lower than the previous period’s typical price.

## How can the MFI be used in a trading strategy?

The Money Flow Index (MFI) can be used in a trading strategy in several ways, including the following:

1. Overbought/oversold: A high MFI value (above 80) is considered to be overbought, and a low MFI value (below 20) is considered to be oversold. Some traders may use these levels as potential buy or sell signals.
2. Divergences: A divergence between the MFI and the price of a financial instrument may be interpreted as a potential reversal signal. For example, if the price of a financial instrument is making new highs, but the MFI is not, it may indicate that buying pressure is waning and that a reversal is imminent.
3. Trend strength: A rising MFI may be interpreted as a sign of a strong uptrend, while a falling MFI may be interpreted as a sign of a weak downtrend.

It is important to note that the MFI is just one of many technical analysis tools, and should not be used in isolation to make investment decisions. It is always important to conduct your own research and consult with a financial advisor or professional before making any investment decisions. Additionally, it is important to use proper risk management techniques, such as stop-loss orders, to protect against potential losses.