Standard Deviation. Explain.
 

Talk amoungst yourselfs, peek at the other Guys paper, whatever.
:hmmm:

The average amount by which a data point (ie score) deviates from the average of that same set of data points. :know:

or it could mean how twisted the average person actually is:k_confused:

Or in other words: the amount of dispersion (Streuung) of scores from the expected value (Erwartungswert).

One of several additional descriptive values without which any expression of mean values (averages) usually makes little sense.

Started statistics courses?

Grouping accuracy :03:

I remember when I was doing my physics lab work stuff and my values (with accounted observation error) did not fit the -true- values I should have been getting.

And then I have used Student's coefficient of 0.99 hehe.

That's easy for you to say; for me it means something quite different...

If you are doing it as a part of A-level math statistics course then just memorise the formula.

In layman terms (not a strict or even formally correct deffenition) - SD is how spread your values are, so the higher SD shows you a more chaotic rather than ordered spread of values.

Hm...?

The position Todd took at the cafe that night in Houston when the weirdo asked him for a cigarette :)

The square of the variance :D


.... or is it square root?


In poker we used to call it a measure of short term luck.

Nope. Writing a program that captures data from a chronograph then calculates the SD and other stuff interesting to Air Gunners.
Found a simple example here:

http://www.mathsisfun.com/data/stand...-formulas.html

The written formula may as well be Chinese to me.
:haha:

Not a square knot?

Ask Rhodes. It's all Greek to him. :O:

What language are you writing your application in? Some core languages may already have a function for calculating standard deviation in its Math library class.

If not, pending the language, I could try writing up a small method.

Why would you need that, when you've got
 

VS 2008 C++ is what I use.
It has no StDev function so I'll have to search out some code or do it myself.
I'm not big into adding other stuff like Boost etc.
FLTK 1.3.2 is all I have and that's for GUI work.

That's not mean deviation-that's CRUEL deviation!
 

^:sign_yeah::agree:http://www.mathsisfun.com/data/image...ion-sample.gif I see it so clearly now; Jeff! You've got it in a nutshell!:k_confused:I didn't know air guns were so complicated.:timeout:

Err you don't really need to create an object (class) for this, a simple function should do just fine.

Yep. A new function is plenty good enuff. I don't like adding some monster package I'll never use.

Nothing worse than having a monster package and never using it.

I have never understood why it has to divide by N-1. Can anyone explain why it is less 1?

I mean, simple averages are simply the sum divided by N. That makes sense to spread the (sum of) differences accross all samples.