iStdDev - MQL4 Documentation

double iStdDev(

string symbol, int timeframe, int ma_period, int ma_shift, int ma_method, int applied_price, int shift)

Calculates the Standard Deviation indicator and returns its value.

Parameters:

symbol	-	Symbol the data of which should be used to calculate indicator. NULL means the current symbol.
timeframe	-	Timeframe. It can be any of Timeframe enumeration values. 0 means the current chart timeframe.
ma_period	-	MA period.
ma_shift	-	MA shift.
ma_method	-	MA method. It can be any of Moving Average method enumeration value.
applied_price	-	Applied price. It can be any of Applied price enumeration values.
shift	-	Index of the value taken from the indicator buffer (shift relative to the current bar the given amount of periods ago).

Sample:

double val=iStdDev(NULL,0,10,0,MODE_EMA,PRICE_CLOSE,0);