StdDev code help please

[tradethebonds]

Please help me understand why my StdDev code is incorrect for Value2.

private int lengthFast = 5; // Default setting for LengthFast
int barsback = 500; //look back period
int Var3 = -0.50; // -0.50 deviation
double Var18 = TRIX(Var1, LengthFast).Default[0];
double Var22 = 1;
Value2 = Var3 * StdDev(Var18, barsBack, Var22);

[NinjaTrader_DaveI]

Hello,

Can you please tell me what value you are getting, and what value you are expecting?

[tradethebonds]

i shoud get -0.19, but I cannot get Ninjatrader code to verify.

[NinjaTrader_DaveI]

Thank you. It looks like we're missing a value for Var1. Can you please tell me what the value should be for that variable?

[koganam]

Please help me understand why my StdDev code is incorrect for Value2.

private int lengthFast = 5; // Default setting for LengthFast
int barsback = 500; //look back period
int Var3 = -0.50; // -0.50 deviation
[COLOR="Blue"][B]double Var18 [/B][/COLOR]= TRIX(Var1, LengthFast).Default[0];
double Var22 = 1;
Value2 = Var3 * StdDev([COLOR="blue"][B]Var18[/B][/COLOR], barsBack, Var22);

You cannot take the StdDev of a single double (pun intended ).

[tradethebonds]

Sorry...about that...

Var1 = EMA(EMA(( 3.14159155 * ( OPEN[0] + CLOSE[0] + HIGH[0] + LOW[0] )) / 4, 2), 5);

[NinjaTrader_DaveI]

Hello,

Thank you for clarifying that. I'm running into another snag attempting to test the code. It appears that you are not passing in the correct parameters for the StdDev() indicator method. Can you please take a look at the help guide article below and advise me what you would like to pass in (either a period only, or a data series and a period)?

http://www.ninjatrader.com/support/h...ion_stddev.htm

I look forward to your reply.

[tradethebonds]

Since it will be updating on each new bar, a data series and a period please.

[NinjaTrader_DaveI]

Sounds good -- can you tell me what you would like to use as the data series and period?

[tradethebonds]

Var1 would be the data series and a period of 500 bars back please, thanks very much!

[NinjaTrader_DaveI]

Hello,

According to your previous post, it looks like Var1 is going to be a double:

Var1 = EMA(EMA(( 3.14159155 * ( OPEN[0] + CLOSE[0] + HIGH[0] + LOW[0] )) / 4, 2), 5);

You will need to rework your code to set up a data series to pass into the StdDev() method. For more information on the difference between native types and data series, please see the help guide articles below:

http://www.ninjatrader.com/support/h...ries_class.htm

http://www.ninjatrader.com/support/h...sic_syntax.htm

Please let know if I can assist further.