# SF - Net open interest

Indicator displays net open interest taker and maker sides

The indicator takes 2 variables Volume delta and Open interest delta as input, which are further compared according to the following logic:

| Open interest delta > 0 | Open interest delta < 0 |

Volume delta > 0 | Net taker long delta > = Open interest delta Net taker short delta = 0 | Net taker long delta = 0 Net taker short delta = Open interest delta |

Volume delta < 0 | Net taker long delta = 0 Net taker short delta = Open interest delta | Net taker long delta < 0 Net taker short delta = Open interest delta |

As a result, the indicator gets 2 new variables:

Net taker long delta - net long interest opened by market orders,

Net taker short delta - net short interest opened by market orders.

Net taker long/short delta variables are calculated from the obtained variables:

Net maker long delta - net long interest opened by limit orders,

Net maker short delta - net short interest opened by limit orders.

Fair enough:

Net maker long delta = Net taker short delta

Net maker short delta = Net taker long delta

That said:

Open interest = Net taker long delta+Net taker short delta = Net maker long delta+Net taker maker delta

since every buy/sell trade opened by a market/limit order always has a trade in the opposite direction of the opposite order type.

The user has the ability to change the values of the following parameters:

How to calculate open interest? - choose the method of calculation: either in contracts (in the quoted asset) or in dollars;

Dispplay input - select the type of input to be displayed: Net maker long delta, Net taker short delta, Net maker short delta, Net taker long delta;

Moving average typeline - type of moving average calculated for PMDI. Can take the following values: "SMA" (simple moving average), "EMA" (exponential moving average), "WMA" (weighted moving average), "VWMA" (volume weighted moving average), "LSMA" (linear regression moving average);

Length - period of moving average and trend channel;

Show metrics? - button to activate the display of the trend channel and moving average of the open interest;

Channel type - type of trend channel. Two options are available - Extremum (based on supertrend channel) and Bolinger bands (based on Bollinger bands indicator).

In the graphics customization window, the user can select:

color and transparency of candles (by default, rising candles are green, falling candles are red, transparency = 0%);

color, transparency and method of displaying the moving average (white opaque line by default);

color, transparency and method of displaying the trend channel (white opaque line by default).

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