1.being unsettled or in doubt or dependent on chance"the uncertainty of the outcome" "the precariousness of his income"
2.the state of being unsure of something
1.(MeSH)The condition in which reasonable knowledge regarding risks, benefits, or the future is not available.
UncertaintyUn*cer"tain*ty (?), n.; pl. Uncertainties (�).
1. The quality or state of being uncertain.
2. That which is uncertain; something unknown.
Our shepherd's case is every man's case that quits a moral certainty for an uncertainty. L'Estrange.
definition of Wikipedia
confusion, disbelief, doubt, doubtfulness, dubiety, dubiousness, fluctuation, hazard, hesitancy, hesitation, incertitude, indecision, indecisiveness, indetermination, insecurity, irresolution, misgiving, oscillation, perplexity, precariousness, problem, quandary, question, reservation, scruple, suspense, uncertainness
Absolute uncertainty • Anxiety/Uncertainty Management • Cone of Uncertainty • Corridor of uncertainty • Dangers (uncertainty) • Fear, uncertainty and doubt • Fear, uncertainty, and doubt • GLUE (uncertainty assessment) • Heisenberg's Principle of Uncertainty • Hirschman uncertainty • International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems • Knightian uncertainty • List of uncertainty propagation software • Measurement uncertainty • Objective Uncertainty • Relative uncertainty • Scientific uncertainty • The Age of Uncertainty • The Uncertainty Principle (The Spectacular Spider-Man) • The Uncertainty Principle (film) • The Uncertainty Principle for the Short-time Fourier Transform • Uncertainty (film) • Uncertainty Principle (Numb3rs) • Uncertainty analysis • Uncertainty avoidance • Uncertainty principle • Uncertainty quantification • Uncertainty reduction theory • Uncertainty tolerance • Volatility, uncertainty, complexity and ambiguity
Area Analysis, Correlation of Data, Correlation Studies, Correlation Study, Data Analysis, Estimation Technics, Estimation Techniques, Indirect Estimation Technics, Indirect Estimation Techniques, Multiple Classification Analysis, Service Statistics, Statistical Study, Statistics, Service, Statistics as Topic, Tables and Charts as Topic - Thinking[Hyper.]
Uncertainty (n.) [MeSH]
characterise, characterize, qualify - beneficial, good - bad, ill - positive - negative - precariousness, uncertainness, uncertainty - falteringly, uncertainly, unsteadily - uncertainly - uncertain - certainty, foregone conclusion, sure thing - certainty - assurance, authority, confidence, self-assurance, self-confidence, sureness[Dérivé]
défaut du caractère (fr)[Classe...]
fait de.. (fr)[Classe...]
uncertain; iffy; unsure[ClasseHyper.]
ne pas croire (fr)[Classe]
(hesitance; hesitancy; hesitation; vacillation; wavering), (vacillate; shrink; hold back; be dubious; boggle; dither; doubt; hesitate; be in doubt; be undecided; falter; waver; hang back; hover)[Thème]
(presumption; theory; impression; assumption; verge; guess; conjecture; supposition; surmise; surmisal; speculation; hypothesis), (hypothesize; surmise; assume; suppose; posit; put; expect; daresay; hypothesise; presume; take for granted; suspect; think; opine; imagine; reckon; guess; believe; figure; postulate; fancy), (alternative)[Thème]
roman (fr)[termes liés]
qualité et sensibilité du jeu musical (fr)[DomainJugement]
iffy, uncertain, unsure[CeQuiEst~]
Uncertainty is a term used in subtly different ways in a number of fields, including physics, philosophy, statistics, economics, finance, insurance, psychology, sociology, engineering, and information science. It applies to predictions of future events, to physical measurements already made, or to the unknown.
Although the terms are used in various ways among the general public, many specialists in decision theory, statistics and other quantitative fields have defined uncertainty, risk, and their measurement as:
|“||Uncertainty must be taken in a sense radically distinct from the familiar notion of risk, from which it has never been properly separated.... The essential fact is that 'risk' means in some cases a quantity susceptible of measurement, while at other times it is something distinctly not of this character; and there are far-reaching and crucial differences in the bearings of the phenomena depending on which of the two is really present and operating.... It will appear that a measurable uncertainty, or 'risk' proper, as we shall use the term, is so far different from an unmeasurable one that it is not in effect an uncertainty at all.||”|
|“||You cannot be certain about uncertainty.||”|
There are other taxonomies of uncertainties and decisions that include a broader sense of uncertainty and how it should be approached from an ethics perspective:
For example, if you do not know whether it will rain tomorrow, then you have a state of uncertainty. If you apply probabilities to the possible outcomes using weather forecasts or even just a calibrated probability assessment, you have quantified the uncertainty. Suppose you quantify your uncertainty as a 90% chance of sunshine. If you are planning a major, costly, outdoor event for tomorrow then you have risk since there is a 10% chance of rain and rain would be undesirable. Furthermore, if this is a business event and you would lose $100,000 if it rains, then you have quantified the risk (a 10% chance of losing $100,000). These situations can be made even more realistic by quantifying light rain vs. heavy rain, the cost of delays vs. outright cancellation, etc.
Some may represent the risk in this example as the "expected opportunity loss" (EOL) or the chance of the loss multiplied by the amount of the loss (10% × $100,000 = $10,000). That is useful if the organizer of the event is "risk neutral," which most people are not. Most would be willing to pay a premium to avoid the loss. An insurance company, for example, would compute an EOL as a minimum for any insurance coverage, then add on to that other operating costs and profit. Since many people are willing to buy insurance for many reasons, then clearly the EOL alone is not the perceived value of avoiding the risk.
Quantitative uses of the terms uncertainty and risk are fairly consistent from fields such as probability theory, actuarial science, and information theory. Some also create new terms without substantially changing the definitions of uncertainty or risk. For example, surprisal is a variation on uncertainty sometimes used in information theory. But outside of the more mathematical uses of the term, usage may vary widely. In cognitive psychology, uncertainty can be real, or just a matter of perception, such as expectations, threats, etc.
Vagueness or ambiguity are sometimes described as "second order uncertainty," where there is uncertainty even about the definitions of uncertain states or outcomes. The difference here is that this uncertainty is about the human definitions and concepts, not an objective fact of nature. It has been argued that ambiguity, however, is always avoidable while uncertainty (of the "first order" kind) is not necessarily avoidable.
Uncertainty may be purely a consequence of a lack of knowledge of obtainable facts. That is, you may be uncertain about whether a new rocket design will work, but this uncertainty can be removed with further analysis and experimentation. At the subatomic level, however, uncertainty may be a fundamental and unavoidable property of the universe. In quantum mechanics, the Heisenberg Uncertainty Principle puts limits on how much an observer can ever know about the position and velocity of a particle. This may not just be ignorance of potentially obtainable facts but that there is no fact to be found. There is some controversy in physics as to whether such uncertainty is an irreducible property of nature or if there are "hidden variables" that would describe the state of a particle even more exactly than Heisenberg's uncertainty principle allows.
In metrology, physics, and engineering, the uncertainty or margin of error of a measurement is stated by giving a range of values likely to enclose the true value. This may be denoted by error bars on a graph, or by the following notations:
The middle notation is used when the error is not symmetrical about the value – for example . This can occur when using a logarithmic scale, for example. The latter "concise notation" is used for example by IUPAC in stating the atomic mass of elements. There, the uncertainty given in parenthesis applies to the least significant figure(s) of the number prior to the parenthesized value (i.e. counting from rightmost digit to left). For instance, 1.00794(7) stands for 1.00794±0.00007, while 1.00794(72) stands for 1.00794±0.00072.
Often, the uncertainty of a measurement is found by repeating the measurement enough times to get a good estimate of the standard deviation of the values. Then, any single value has an uncertainty equal to the standard deviation. However, if the values are averaged, then the mean measurement value has a much smaller uncertainty, equal to the standard error of the mean, which is the standard deviation divided by the square root of the number of measurements.
When the uncertainty represents the standard error of the measurement, then about 68.2% of the time, the true value of the measured quantity falls within the stated uncertainty range. For example, it is likely that for 31.8% of the atomic mass values given on the list of elements by atomic mass, the true value lies outside of the stated range. If the width of the interval is doubled, then probably only 4.6% of the true values lie outside the doubled interval, and if the width is tripled, probably only 0.3% lie outside. These values follow from the properties of the normal distribution, and they apply only if the measurement process produces normally distributed errors. In that case, the quoted standard errors are easily converted to 68.3% ("one sigma"), 95.4% ("two sigma"), or 99.7% ("three sigma") confidence intervals.
In this context, uncertainty depends on both the accuracy and precision of the measurement instrument. The lower the accuracy and precision of an instrument, the larger the measurement uncertainty is. Notice that precision is often determined as the standard deviation of the repeated measures of a given value, namely using the same method described above to assess measurement uncertainty. However, this method is correct only when the instrument is accurate. When it is inaccurate, the uncertainty is larger than the standard deviation of the repeated measures, and it appears evident that the uncertainty does not depend only on instrumental precision.
Uncertainty in science, and science in general, is often interpreted much differently in the public sphere than in the scientific community. This is due in part to the diversity of the public audience, and the tendency for scientists to misunderstand lay audiences and therefore not communicate ideas clearly and effectively. One example is explained by the information deficit model. Also, in the public realm, there are often many scientific voices giving input on a single topic. For example, depending on how an issue is reported in the public sphere, discrepancies between outcomes of multiple scientific studies due to methodological differences could be interpreted by the public as a lack of consensus in a situation where a consensus does in fact exist. This interpretation may even been intentionally promoted, as scientific uncertainty may be managed to reach certain goals. For example, global warming skeptics took the advice of Frank Luntz to frame global warming as an issue of scientific uncertainty, which was a precursor to the conflict frame used by journalists when reporting the issue.
“Indeterminacy can be loosely said to apply to situations in which not all the parameters of the system and their interactions are fully known, whereas ignorance refers to situations in which it is not known what is not known,”. These unknowns, indeterminacy and ignorance, that exist in science are often “transformed” into uncertainty when reported to the public in order to make issues more manageable, since scientific indeterminacy and ignorance are difficult concepts for scientists to convey without losing credibility. Conversely, uncertainty is often interpreted by the public as ignorance. The transformation of indeterminacy and ignorance into uncertainty may be related to the public’s misinterpretation of uncertainty as ignorance.
Journalists often either inflate uncertainty (making the science seem more uncertain than it really is) or downplay uncertainty (making the science seem more certain than it really is). One way that journalists inflate uncertainty is by describing new research that contradicts past research without providing context for the change Other times, journalists give scientists with minority views equal weight as scientists with majority views, without adequately describing or explaining the state of scientific consensus on the issue. In the same vein, journalists often give non-scientists the same amount of attention and importance as scientists.
Journalists may downplay uncertainty by eliminating “scientists’ carefully chosen tentative wording, and by losing these caveats the information is skewed and presented as more certain and conclusive than it really is”. Also, stories with a single source or without any context of previous research mean that the subject at hand is presented as more definitive and certain than it is in reality. There is often a “product over process” approach to science journalism that aids, too, in the downplaying of Finally, and most notably for this investigation, when science is framed by journalists as a triumphant quest, uncertainty is erroneously framed as “reducible and resolvable”.
Some media routines and organizational factors affect the overstatement of uncertainty; other media routines and organizational factors help inflate the certainty of an issue. Because the general public (in the United States) generally trusts scientists, when science stories are covered without alarm-raising cues from special interest organizations (religious groups, environmental organization, political factions, etc.) they are often covered in a business related sense, in an economic-development frame or a social progress frame. The nature of these frames is to downplay or eliminate uncertainty, so when economic and scientific promise are focused on early in the issue cycle, as has happened with coverage of plant biotechnology and nanotechnology in the United States, the matter in question seems more definitive and certain.
Sometimes, too, stockholders, owners, or advertising will pressure a media organization to promote the business aspects of a scientific issue, and therefore any uncertainty claims that may compromise the business interests are downplayed or eliminated.
|Look up uncertainty in Wiktionary, the free dictionary.|
|Wikiquote has a collection of quotations related to: Uncertainty|
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