Indicador Money Flow Index

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Money Flow Index – MFI Definition and Uses

What Is the Money Flow Index (MFI)?

The Money Flow Index (MFI) is a technical oscillator that uses price and volume for identifying overbought or oversold conditions in an asset. It can also be used to spot divergences which warn of a trend change in price. The oscillator moves between 0 and 100.

Unlike conventional oscillators such as the Relative Strength Index (RSI), the Money Flow Index incorporates both price and volume data, as opposed to just price. For this reason, some analysts call MFI the volume-weighted RSI.

Key Takeaways

  • The indicator is typically calculated using 14 periods of data.
  • An MFI reading above 80 is considered overbought and an MFI reading below 20 is considered oversold.
  • Overbought and oversold doesn’t necessarily mean the price will reverse, only that the price (factoring for volume) is near the high or low of its recent price range.
  • The creators of the index, Gene Quong and Avrum Soudack, recommended using 90 and 10 as overbought and oversold levels. These levels are rarely reached, but when they are it often means the price could be due for a direction change.
  • A divergence between the indicator and price is noteworthy. For example, if the indicator is rising while the price is falling or flat, the price could start rising.

The Formulas for the Money Flow Index (MFI) Are:

When the price advances from one period to the next Raw Money Flow is positive and it is added to Positive Money Flow. When Raw Money Flow is negative because the price dropped that period, it is added to Negative Money Flow.

How to Calculate the Money Flow Index (MFI)

There are several steps for calculating the Money Flow Index. If doing it by hand, using a spreadsheet is recommended.

  1. Calculate the Typical Price for each of the last 14 periods.
  2. For each period, mark whether the typical price was higher or lower than the prior period. This will tell you whether Raw Money Flow is positive or negative.
  3. Calculate Raw Money Flow by multiplying the Typical Price by Volume for that period. Use negative or positive numbers depending on whether the period was up or down (see step above).
  4. Calculate the Money Flow Ratio by adding up all the positive money flows over the last 14 periods and dividing it by the negative money flows for the last 14 periods.
  5. Calculate the Money Flow Index (MFI) using the ratio found in step four.
  6. Continue doing the calculations as each new period ends, using only the last 14 periods of data.

What Does the Money Flow Index (MFI) Tell You?

One of the primary ways to use the Money Flow Index is when there is a divergence. A divergence is when the oscillator is moving in the opposite direction of price. This is a signal of a potential reversal in the prevailing price trend.

For example, a very high Money Flow Index that begins to fall below a reading of 80 while the underlying security continues to climb is a price reversal signal to the downside. Conversely, a very low MFI reading that climbs above a reading of 20 while the underlying security continues to sell off is a price reversal signal to the upside.

Traders also watch for larger divergences using multiple waves in the price and MFI. For example, a stock peaks at $10, pulls back to $8, and then rallies to $12. The price has made two successive highs, at $10 and $12. If MFI makes a lower higher when the price reaches $12, the indicator is not confirming the new high. This could foreshadow a decline in price.

The overbought and oversold levels are also used to signal possible trading opportunities. Moves below 10 and above 90 are rare. Traders watch for the MFI to move back above 10 to signal a long trade, and to drop below 90 to signal a short trade.

Other moves out of overbought or oversold territory can also be useful. For example, when an asset is in an uptrend, a drop below 20 (or even 30) and then a rally back above it could indicate a pullback is over and the price uptrend is resuming. The same goes for a downtrend. A short-term rally could push the MFI up to 70 or 80, but when it drops back below that could be the time to enter a short trade in preparation for another drop.

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The Difference Between the Money Flow Index (MFI) and the Relative Strength Index (RSI)

The MFI and RSI are very closely related. The main difference is that MFI incorporates volume, while the RSI does not. Proponents of volume analysis believe it is a leading indicator. Therefore, they also believe that MFI will provide signals, and warn of possible reversals, in a more timely fashion than the RSI. One indicator is not better than the other, they are simply incorporating different elements and will, therefore, provide signals at different times.

Limitations of the Money Flow Index (MFI)

The MFI is capable of producing false signals. This is when the indicator does something that indicates a good trading opportunity is present, but then the price doesn’t move as expected resulting in a losing trade. A divergence may not result in a price reversal, for instance.

The indicator may also fail to warn of something important. For example, while a divergence may result in a price reversing some of the time, divergence won’t be present for all price reversals. Because of this, it is recommended that traders use other forms of analysis and risk control and not rely exclusively on one indicator.

Money Flow Index (MFI) – indicator for MetaTrader 4

Money Flow Index (MFI) is the indicator, which indicates the rate at which money is invested into a security and then withdrawn from it.

Construction and interpretation of the indicator is similar to Relative Strength Index with the only difference that volume is important to MFI.

When analyzing the money flow index one needs to take into consideration the following points:

Divergences between the indicator and price movement. If prices grow while MFI falls (or vice versa), there is a great probability of a price turn;

Money Flow Index value, which is over 80 or under 20, signals correspondingly of a potential peak or bottom of the market.

Calculation

The calculation of Money Flow Index includes several stages. At first one defines the typical price (TP) of the period in question.

TP = (HIGH + LOW + CLOSE)/3

Then one calculates the amount of the Money Flow (MF):

If today’s typical price is larger than yesterday’s TP, then the money flow is considered positive. If today’s typical price is lower than that of yesterday, the money flow is considered negative. A positive money flow is a sum of positive money flows for a selected period of time.A negative money flow is the sum of negative money flows for a selected period of time.

Then one calculates the money ratio (MR) by dividing the positive money flow by the negative money flow:

MR = Positive Money Flow (PMF)/Negative Money Flow (NMF)

And finally, one calculates the money flow index using the money ratio:

MFI = 100 – (100 / (1 + MR))

Full description of MFI is available in the Technical analysis: Money Flow Index

Money Flow Index (MFI)

Indicators and Strategies

Money Flow Index (MFI)

The Money Flow Index indicator (MFI) is a tool used in technical analysis for measuring buying and selling pressure. This is done through analyzing both price and volume. The MFI’s calculation generates a value that is then plotted as a line that moves within a range of 0-100, making it an oscillator. When the MFI rises, this indicates an increase in buying pressure. When it falls, this indicates an increase in selling pressure. The Money Flow Index can generate several signals, most notably; overbought and oversold conditions, divergences, and failure swings.

Read more about the Money Flow Index indicator (MFI).

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