Simple Moving Median Indicator

The SMM trading indicator is very similar to the SMA (Simple Moving Average) function, except that instead of returning the average (or mean) price it returns the median price.

A median is conceptually similar to a average except that an average is affected by outliers while a median is not. It is calculated by sorting all the numbers in the series and picking the number in the middle. For example, consider the following 5 days of closing prices for security ABC:
10.01
10.55
10.24
10.20
12.00

The average price is 10.60. The median price is 10.24. Some people like to use Simple Moving Median crossovers instead of Simple Moving Average crossovers.

Examples of usage:
MedianPrice(close, 10) returns the median closing price during the past 10 trading days (2 weeks).
Close > MedianPrice(close, 20) will evaluate to true only if the most recent closing price is more than the median closing price during the past month.

GSPC = GetSeries("^GSPC", close);
a = MedianPrice(GSPC, 252);
returns the median closing price of the S&P 500 Index over the past year.

Note: Do not confuse this indicator with the MedPrice() function which
returns the average of the high and low prices.

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