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standard
In statistics, the standard deviation (SD, also represented by the lower case Greek letter sigma σ for the population standard deviation or the Latin letter s for the sample standard deviation) is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation indicates that the data points tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.
The standard deviation of a random variable, statistical population, data set, or probability distribution is the square root of its variance. It is algebraically simpler, though in practice less robust, than the average absolute deviation.
A useful property of the standard deviation is that, unlike the variance, it is expressed in the same units as the data.
In addition to expressing the variability of a population, the standard deviation is commonly used to measure confidence in statistical conclusions. For example, the margin of error in polling data is determined by calculating the expected standard deviation in the results if the same poll were to be conducted multiple times. This derivation of a standard deviation is often called the "standard error" of the estimate or "standard error of the mean" when referring to a mean. It is computed as the standard deviation of all the means that would be computed from that population if an infinite number of samples were drawn and a mean for each sample were computed.
The standard deviation of a population and the standard error of a statistic derived from that population (such as the mean) are quite different but related (related by the inverse of the square root of the number of observations). The reported margin of error of a poll is computed from the standard error of the mean (or alternatively from the product of the standard deviation of the population and the inverse of the square root of the sample size, which is the same thing) and is typically about twice the standard deviation—the half-width of a 95 percent confidence interval.
In science, many researchers report the standard deviation of experimental data, and only effects that fall much farther than two standard deviations away from what would have been expected are considered statistically significant—normal random error or variation in the measurements is in this way distinguished from likely genuine effects or associations. The standard deviation is also important in finance, where the standard deviation on the rate of return on an investment is a measure of the volatility of the investment.
When only a sample of data from a population is available, the term standard deviation of the sample or sample standard deviation can refer to either the above-mentioned quantity as applied to those data, or to a modified quantity that is an unbiased estimate of the population standard deviation (the standard deviation of the entire population).
I have a new Geissele BCG I picked up awhile back and never ended up using. Still oiled up from the factory with the original packaging. These are the same ones that were used to fill the URGI contract.
- Mil-Spec Carrier
- HPT/MPI marked Bolt
$150, meet up at Sportsmans off Hwy26 and 185th...
High Standard Derringer, model DM-101. Over/under two-shot pistol in .22 magnum caliber. The barrel length measures 3 & 1/4" and the gun is double action only. Snag free design conceals easily and deeply. All steel construction. $325.00.
I haven't been paying too much attention to all the draconian gun bills in WA state, but provided that the Blue Hairs in OR state pass their gun bill this session, we will no longer be able to possess standard-capacity magazines in public anymore. They'll only be legal at home, at a shooting...
Bought new and has been in storage since my Anschutz match rifle prefers Eley. Can ship the ammo with UPS commercial rates. I take cash, USPS money orders and electronic forms of payment not listed. This is the same as Wolf Match Target as SK (Lapua) made this ammo for Wolf during this time...
Genuine WW2 vintage Hi Standard USA-HD set up as a HDM/s with new production very efficient silencer.
Be the only kid on the block with one. Suitable for framing and for shooting. Normally I do these built on HD Military which is what most folks associate with the suppressed pistols but the WW2...
I am looking for two High Standard factory 10-round .22LR magazines for the Citation / Trophy / Supermatic "military" series. The ones with the open gap in the floorplate and darker green followers. not the "lime" green followers.
I have tried the aftermarket mags and they just won't work in my...
I've got a brand new HK usp 45 threaded barrel standard size 16x1 LH thread pitch that I'm not in need of and just want to get my money back for it. or trade for some ammo 9mm,40s&w,45acp,223-556,308
You are buying a Triple K Magazine Llama Standard 9mm magazine. The magazine comes from a estate out of California and it is in its original packaging. It appears to never have been used. Buyer pays $10 shipping or can deliver PDX metro area.
Been scarfing them up pretty hard for the last few weeks. Offering fresh integral suppressed HDM's. See page for full details
https://www.advancedbydesign.com/products/high-standard-hdm-int22-hdm-int-6356
This ultimate "Gucci Glock" only has about 50 rounds downrange so this beauty is MINTY and the red dot optic is zeroed-in! This pistol shoots so smoothly and flatly that it almost gives it an unfair advantage. Plus the weight of the gun along with a grip that is combination of a 1911 and Glock...
Brand new never fired,Comes with one 30 round mag,It does have a scratch on the receiver,It was there when I bought it,Selling it at a lower price because of that.Third pic shows it.
I have 8 boxes of ELEY Match and 7 boxes SK Standard plus left over from bricks that I was testing that I’d like to sell.
ELEY Match $16/box(50)
SK Standard Plus $8/box(50)
I’m not willing to ship but can meet close to Auburn if you’re interested in multiple boxes.
I’m interested in trades for...
Great Revolver, in good shape. Grip is just wrapped, not covering anything. Can include holster. Looking for an RMRcc or cash mainly. Or stock Glock 43X or 48 mos, 43 or partial trade for a frame.
Item:
BCM® Standard 11.5" (Enhanced Lightweight) Carbine Upper Receiver Group w/ MCMR-10 Handguard w/ BCG
Price:
$600
Location:
Portland. Will ship if you pay
This is brand new, never even mounted to a lower. Comes with the hardware shown, decals and the BCM BCG. I changed my mind on my...
Impulse bought this yesterday from Oregon rifle worlds for 310. Decided it’s really not for me. Asking 300. May trade for ammo or for a firearm. Or with my other classifieds for something? Pm me! Meet in Hillsboro.