Standard Deviation

In statistics and probability theory, standard deviation (represented by the symbol σ) shows how much variation or "dispersion" exists from the average (mean, or expected value). A low standard deviation indicates that the data points tend to be very close to the mean, whereas high standard deviation indicates that the data points are spread out over a large 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 practically less robust than the average absolute deviation. A useful property of standard deviation is that, unlike variance, it is expressed in the same units as the data.

In addition to expressing the variability of a population, 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. The reported margin of error is typically about twice the standard deviation – the radius of a 95 percent confidence interval. In science, researchers commonly report the standard deviation of experimental data, and only effects that fall far outside the range of standard deviation are considered statistically significant – normal random error or variation in the measurements is in this way distinguished from causal variation. 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.

Flooding Continues As Waters Rise in France

Edit WorldNews.com 02 Jun 2016

With over 8,000 rescue operations already underway, emergency workers have a battle against them as meteorologists warn the waters are expected to continue rising for days, according to The Associated Press. The Seine River has overflowed causing one town to be wholly evacuated as both government and citizen groups work to rescue those stranded by the flooding ... ... "Apart from that, we find it very entertaining ... –WN.com, Maureen Foody....

photo: Via YouTube

Baby with Zika-related microcephaly born at New Jersey hospital

Edit CNN 01 Jun 2016

(CNN)A baby with Zika virus-related microcephaly was born in New Jersey on Tuesday, hospital officials said. The baby and mother are stable and doing well following the cesarean delivery, said Dr. Abdulla Al-Kahan, director of maternal and fetal medicine at Hackensack University Medical Center. "The mother is stable, obviously sad, which is the normal emotional reaction given the situation," he said ... Read More ... CDC confirmation ... ....

photo: AP / Nick Ut

An FBI SWAT team arrives at the scene of a fatal shooting at the University of California, Los Angeles, Wednesday, June 1, 2016, in Los Angeles.

[BREAKING] Video: Murder-Suicide Places UCLA Campus On Lockdown

Edit WorldNews.com 01 Jun 2016

The UCLA campus was placed on lockdown just after 10 a.m. local time Wednesday when two men were killed in a murder/suicide in an on-campus shooting that prompted a massive response from local and federal law enforcement, the Los Angeles Police Department told The Los Angeles Times. "The campus is now safe," Los Angeles Police Chief Charlie Beck told reporters in a short news conference ... The FBI and the U.S ... – WN.com, Jack Durschlag. ....

photo: AP / Department of National Parks, Wildlife and Plant Conservation

In this photo released by the Department of National Parks, Wildlife and Plant Conservation, the remains of tiger cubs and a bear are laid out at the "Tiger Temple" in Saiyok district in Kanchanaburi province, west of Bangkok, Thailand, Wednesday, June 1, 2016.

Dozens of dead tiger cubs found in freezer at Thai temple

Edit The Irish Times 01 Jun 2016

Thai wildlife authorities found 40 tiger cub carcasses in a freezer in Thailand’s infamous Tiger Temple on Wednesday as they removed live animals in response to international pressure over suspected trafficking and abuse ... But the temple has been investigated for suspected links to wildlife trafficking and abuse ... Reuters.   . . ....

photo: WN / Jamal Penjweny

People in the Green Zone checkpoint with Iraqi solider

Iraq’s Green Zone Turns Red, Signals Phase Four Of Pacification

Edit WorldNews.com 01 Jun 2016

Article by WN.com Correspondent Dallas DarlingWhen 150 Iraqi demonstrators were brutally beaten or shot to death trying to breach the Green Zone, it signaled Phase Four of the U.S.-led Global Police State and its attempt to pacify geopolitical spheres of influence, public spaces and war of narratives ... “Curse the government that kills its children in cold blood.” . This prophetic condemnation was actually mirrored by U.S ... May 28, 2016.....

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Mid-week market recap: Stocks wait for jobs report on Friday

Edit The Examiner 01 Jun 2016

For the mid-week ending June 1, 2016, the markets are mixed with the Dow slightly down and the S&P 500 slightly up ... In other news ... The stock market remains in a narrow range ... If you're trading options, it is suggested trading Put credit spreads for the remainder of the week at 1.75 standard deviations or greater. Expect the price of the SPX to fall within 2057 and 2143 (2 standard deviations) by this Friday ... ....

Lululemon Shareholders Are Going to Have a Bad Summer, This Chart Shows

Edit The Street 01 Jun 2016

Here's why. ... Therefore, the reward of 9 points higher must be balanced by the risk of roughly 40 points lower. This strongly favors using 65 as a protective sell stop level to guard against disaster, as well as exiting long exposure into 74, where the olive-gold line illustrates the upper 2 standard deviation band; a statistical extreme that controls 95% of normality ... Sell upon a close under 65. --- ... ....

High-Sensitivity Cardiac Troponin I Levels in ACS Patients (American College of Cardiology Foundation)

Edit Public Technologies 01 Jun 2016

(Source. American College of Cardiology Foundation). Study Questions. ... Methods.. A pooled analysis of five international (Australia, New Zealand, and England) prospective, observational cohort studies with blinded outcome assessment and 30-day follow-up was conducted ... Results.. Of the 3,155 eligible patients, 1,771 were male (56.1%), and mean (standard deviation) age was 57.4 (13.3) years. AMI developed in 291 individuals (9.2%) ... (noodl....

Pilot Plant Update with Letter of Intent (Berkeley Mineral Resources plc)

Edit Public Technologies 01 Jun 2016

(Source. Berkeley Mineral Resources plc) 98514f7f-0375-47e0-812e-92d501fc75f8.pdf. RNS Number . 8088Z BMR Group PLC . 01 June 2016. Wednesday 1 June 2016. BMR Group PLC ("BMR" or the "Company") Pilot Plant Update with Letter of Intent ... Tony Francis has concluded that the capital expenditure of $2.68 million can be categorised as adequate for a scoping estimate with an industry-standard deviation of -30% and +50% ... Director....

Perth data validation confirms Airservices noise modelling (Airservices Australia)

Edit Public Technologies 31 May 2016

(Source. Airservices Australia) ... Differences between the averages of the measured maximum noise level was within one standard deviation of the modelled value from Canning Vale. The results of the data validation study mean that there will be no changes to the flight paths for aircraft departing to the south from Runway 21. Airservices uses the best available tools for aircraft noise modelling worldwide ... (noodl. 33869318) ....

Your money: Stay invested for multiple time horizons to generate MF returns

Edit Yahoo Daily News 31 May 2016

There is never a dull moment in the wealth creation. First, you need to determine the rate at which the portfolio will grow and then look at the asset allocation ... But how do you interpret the statement, when you are told that a particular asset class has delivered an average a return of 15%, with a standard deviation of 30%. What questions come to your mind? ... The Portfolio Management Scheme also gives similar information ... Keep it simple....

ICC to review independent study to see if there is a fine-edge advance to be ...

Edit The National 31 May 2016

On Tuesday and Wednesday this week, the International Cricket Council (ICC) cricket committee has been presented with what is the first independent assessment of the technologies that are used in cricket's Decision Review System (DRS) ... "This [ball-tracking] is more, how close to the two coordinates does the ball pass, what's the standard deviation and what's the average variation between the technology and the testing device?"....

The talk that markets are getting more and more volatile is actually just talk

Edit The Times of India 30 May 2016

By Dhirendra Kumar. It's common to hear that the stock markets are becoming more and more volatile ... The standard deviation of the day-to-day swings of the markets can be compared across different periods to find out objectively how volatile the markets were ... The standard deviation of daily returns was 1.1in 1980-85, and then 1.7, 2.3, 1.7, 1.7, 2.0, and 1.0 in the successive five-year periods ... Again, pretty much the same pattern....

Vittangi Graphite Resource Upgrade (Talga Resources Ltd)

Edit Public Technologies 30 May 2016

(Source. Talga Resources Ltd) 20160530VittangiResourceASX. 30 May 2016‌ ASX.TLG ... Tonnes ... The block estimation parameters initially used for classification guidance included average distance of points, closest points, number of points and standard deviation ... For historical drillholes graphite analyses was by IR- detector which is industry standard for carbon analysis today and as such the method used historically is considered appropriate....

High-frequency trading (Deutsche Bank AG)

Edit Public Technologies 30 May 2016

(Source. Deutsche Bank AG) High-frequency trading. Reaching the limits. Research Briefing. Global financial markets. May 24, 2016. High-frequency trading. Reaching the limits. Author. Orçun Kaya. +49 69 910-31732. orcun.kaya@db.com. Editor. Jan Schildbach ... Germany. E-mail ... For example, between 2010 and 2015 very rare events (a five standard deviation move in asset prices) occurred 2.5 times more often than between 2001 and 2006 in US equity markets....

Will Stroud Joins Forward Together (The University of Mississippi)

Edit Public Technologies 29 May 2016

(Source. The University of Mississippi) ... Photo by Bill Dabney. OXFORD, Miss. - Aircraft manufacturer Cirrus published a tagline to describe its SR22-model personal prop plane. 'Make your life possible.' ... 'So I had to go back to square one and say, 'This is where I think the value is; this is how much I need to make; this is the standard deviation of risk that I am willing to take and if it's outside of that, then we can't look at it.'....

Eat fruits during pregnancy for smarter kids: study

Edit Deccan Chronicle 27 May 2016

Toronto. Moms-to-be, take note! Women who eat more fruits during pregnancy may give birth to smarter children, a new study has claimed ... Using a traditional IQ scale as a model, the average IQ is 100 and the standard deviation is 15; two thirds of the population will fall between 85 and 115, researchers said ... "It is quite a substantial difference - that is half of a standard deviation," said Mandhane ... ....

Former IMD director predicts delay in arrival of monsoon

Edit Yahoo Daily News 27 May 2016

The onset of the monsoon over Kerala is likely be delayed by more than ten days from the normal date of June 1, Joseph P V, former director of India Meteorological Department (IMD), said ... Monsoon rains are critical for Indian agriculture with the majority of farms lacking irrigation facilities ... During the last 100 years, the average date of monsoon onset was June 1 with a standard deviation of eight days ... ....