Standard Deviation. Explain.

[Jeff-Groves]

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

[StdDev]

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

or it could mean how twisted the average person actually is

[Skybird]

Originally Posted by StdDev

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

or it could mean how twisted the average person actually is

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?

[vanjast]

Grouping accuracy

[ikalugin]

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.

[Eichhörnchen]

Originally Posted by Skybird

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?

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

[ikalugin]

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.

[Skybird]

Originally Posted by Eichhornchen

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

Hm...?

[Jimbuna]

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

[Gargamel]

The square of the variance


.... or is it square root?


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

[Jeff-Groves]

Originally Posted by Skybird

Started statistics courses?

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.

[Sailor Steve]

Originally Posted by Gargamel

.... or is it square root?

Not a square knot?

Originally Posted by Jeff-Groves

The written formula may as well be Chinese to me.

Ask Rhodes. It's all Greek to him.

[Chad]

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.

[Eichhörnchen]

this?

[Jeff-Groves]

Originally Posted by Chad

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.

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.