Please support Standard Deviation

[mr23]

Have you considered supporting Standard Deviation?

Moved over from Gordon's Issue (#1) Reducing Multiple Values...

On 9/15/2014 8:06 AM, Ethan Jewett wrote:

@mr23 https://github.com/mr23 Standard deviation would definition
just fit as a new type of aggregation - it won't really affect any
changes to the API. If you want to create a separate issue, that would
be great. And if you can remind me how to calculate the std dev, that
would be great too :-)

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Reply to this email directly or view it on GitHub
#1 (comment).

http://en.wikipedia.org/wiki/Standard_deviation

I drafted up some files for Sum of Squares and StD.
I'm not sure this is the best arrangement or reflects everything needed
test-wise.
As I said, just a draft.
I did not set up a build environment yet so I'm not sure it will compile
without an error.

But I figured the least I could do would be to offer up some example
code for the Std.

Next opportunity I'll make another pass over this, but could be a few
days or more. You never know what life brings next.

-Chris

ps. in my original email reply tonight to the Issue#1 thread, I attached the draft files. I figured they wouldn't show up here in the issue, but I don't know if you (Ethan) will received a copy of them in an email. If not, please contact me via email (use one in profile); I don't have time tonight to work up a fork, ..., pull request.

[esjewett]

As mentioned, this is definitely something I'd like to do. I've emailed separately, but if you have time later to set up a pull request that would be excellent. If you have any questions on how to add a new aggregation, I'm happy to answer here and then convert that into a wiki page for future reference. Otherwise I will get to it probably over the weekend.

[esjewett]

Modified the code from your email and added it. Seems to pass the test cases you provided. @mr23 - would you might testing it out?

[mr23]

Works here, thanks for the quick responses.
I figured out how to incorporate it, so I'm good there.
I'll share what I'm doing in the next day or two.

On September 17, 2014 3:22:38 PM CDT, Ethan Jewett notifications@github.com wrote:

Modified the code from your email and added it. Seems to pass the test
cases you provided. @mr23 - would you might testing it out?

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Reply to this email directly or view it on GitHub:
#2 (comment)

Sent from my Android device with K-9 Mail. Please excuse my brevity.

[mr23]

Sample at http://the12lab.com/GDCA_Html/TestStats.html, the 3 tables are handled by Reductio.
Select a region on the scatter plot, and note the statistics changes.
Thanks for your help.