Steema Central

Hi,

I've written a few extra functions for my application but the problem is that when I set the chart to live update those series of course don't update like the built in functions.

The ones I've built in and would like to see are:

Percentage change (I'm actually amazed that this one isn't already there)
Minus last period
Linear regression
EWMA
GARCH
y=mx+b
X12 ARIMA (method available as a program at U.S. Census bureau.)

It would also be nice if one could have a statistics object of a series that gave basic statistics of the series:

Skewness
Kurtosis
Slope
y-intercept
etc.

If you have questions about any of those I'll be glad to answer.

thanks,
nisbus

Hi nisbus,

It would be really helpful if you could provide use some information or URL about each series specification.

Regarding your series not updating as built-in series, if you are a sourcecode customer you could check how TeeChart implements its functions.

Thanks in advance.

Here are some resources where you can find information on these functions.

Percentage change : Simply subtract the old value from the new value, then divide by the old value. Multiply the result by 100 and slap a % sign on it.

Minus last period : used for series with a datetime x axis, just start at y[1] and subtract the value with y[0] etc.

Linear regression : http://en.wikipedia.org/wiki/Linear_regression
EWMA : http://www.itl.nist.gov/div898/handbook ... pmc324.htm (this is actually a great page for statistics and math formulas)
GARCH/ARCH : http://www.mathworks.com/products/garch/
y=mx+b : http://mathforum.org/cgraph/cslope/mxplusb.html
X-12 ARIMA : http://www.census.gov/srd/www/x12a/

Skewness: http://en.wikipedia.org/wiki/Skewness
Kurtosis : http://en.wikipedia.org/wiki/Kurtosis
Slope & y-intercept : http://www.math.com/school/subject2/les ... 4L2GL.html

I will most definitely be looking into the TeeChart implementation of functions.

thanks,
nisbus

Hi nisbus,

Thank you very much for the information. I've added your request to our wish-list to be considered for inclusion in future releases.