Mean of the High line plot

[zachj]

Im sure this is terribly simple, I was thinking it would probably be easiest just to use the bollinger band code and alter it. Looking to plot the mean of the high and the mean of the low and then plot 1 standard deviation from each line.

So I assume I can just replace the SMA part in the BBand code with whatever the code is for the mean of the high and the low.

[NinjaTrader_Bertrand]

Yes Zachj, you would basically have two means and Stddev values (based on high / low prices) then from which to compute Upper / Lower levels.

[zachj]

What i was seeking is the actual code line for the mean of the high and the mean of the low. Is it something like..

Mean data series high

[NinjaTrader_Bertrand]

You would need to supply the desired input series to the SMA calculating the mean then, per default it would use the close prices. So for example SMA(High, 20)

[zachj]

Ok that was really simple, just added High to the smaValue code line. It calculates the High mean correctly. But the standard deviation is off which I can see from checking in an Excel spreadsheet. I even checked the custom NT Bollinger band indicator, its not calculating 1 Standard Deviation correctly. Its less than 1 its something like .82 of a StdDev.

You can check it for yourself, just take any two day period and check 1 StdDev of the 2 closes. As an example..
Nasdaq Composite index:
last wed close 3196.88
last thrsdy close 3198.66
mean is 3197.77

StDev(3196.88; 3198.66) =1.2586

Upper band should then equal the mean + 1StDev or 3197.77 + 1.2586 = 3199.0286
But ninja trader shows 3198.66

[NinjaTrader_Lance]

I tested this on my end and get the correct results when simply printing the Standard Deviation of two values.

Could you post your code and your expected result so that we may examine further.

Additionally please ensure you're storing the value as a double and not as an int.

[zachj]

I just edited my previous post below with an example on Nasdaq. And Im just using the custom BBand indicator in ninja trader.

[NinjaTrader_Lance]

Nasdaq Composite index:
last wed close 3196.88
last thrsdy close 3198.66
mean is 3197.77

StDev(3196.88; 3198.66) =1.2586

Upper band should then equal the mean + 1StDev or 3197.77 + 1.2586 = 3199.0286
But ninja trader shows 3198.66

The StdDev() will get the population standard dev which in this example is equal to .89

You would have to code your own function if you wished to use the basic standard deviation value

For a good StdDev calculator along with a detailed tutorial on the math behind it: http://easycalculation.com/statistic...-deviation.php

Please let me know if I can be of further assistance.

[zachj]

Oh ok gotcha, thanks for clearing that up.