PREDICTABILITY is the degree to which a correct prediction or forecast of a system 's state can be made either qualitatively or quantitatively.
* 1 Predictability and Causality
* 1.1 Laplace\'s Demon
* 2 In statistical physics * 3 In mathematics * 4 In human–computer interaction * 5 In human sentence processing * 6 In biology * 7 In popular culture * 8 Techniques
* 9 In climate
* 9.1 The Spring Predictability Barrier
* 10 In macroeconomics * 11 See also * 12 References * 13 External links
PREDICTABILITY AND CAUSALITY
In experimental physics, there are always observational errors
determining variables such as positions and velocities. So perfect
prediction is practically impossible. Moreover, in modern quantum
Laplace\'s Demon is a supreme intelligence who could completely predict the one possible future given the Newtonian dynamical laws of classical physics and perfect knowledge of the positions and velocities of all the particles in the world. In other words, if it were possible to have every piece of data on every atom in the universe from the beginning of time, it would be possible to predict the behavior of every atom into the future. Laplace’s determinism is usually thought to be based on his mechanics, but he could not prove mathematically that mechanics is deterministic. Rather, his determinism is based on general philosophical principles, specifically on the principle of sufficient reason and the law of continuity.
IN STATISTICAL PHYSICS
Although the second law of thermodynamics can determine the equilibrium state that a system will evolve to, and steady states in dissipative systems can sometimes be predicted, there exists no general rule to predict the time evolution of systems distanced from equilibrium, e.g. chaotic systems , if they do not approach an equilibrium state. Their predictability usually deteriorates with time and to quantify predictability, the rate of divergence of system trajectories in phase space can be measured (Kolmogorov–Sinai entropy , Lyapunov exponents ).
In stochastic analysis a random process is a predictable process if it is possible to know the next state from the present time.
The branch of mathematics known as Chaos Theory focuses on the behavior of systems that are highly sensitive to initial conditions. It suggests that a small change in an initial condition can completely alter the progression of a system. This phenomenon is known as the butterfly effect , which claims that a butterfly flapping its wings in Brazil can cause a tornado in Texas. The nature of chaos theory suggests that the predictability of any system is limited because it is impossible to know all of the minutiae of a system at the present time. In principal, the deterministic systems that chaos theory attempts to analyze can be predicted, but uncertainty in a forecast increases exponentially with elapsed time.
IN HUMAN–COMPUTER INTERACTION
In the study of human–computer interaction , predictability is the property to forecast the consequences of a user action given the current state of the system.
A contemporary example of human-computer interaction manifests in the development of computer vision algorithms for collision-avoidance software in self-driving cars. Researchers at NVIDIA Corporation, Princeton University, and other institutions are leveraging deep learning to teach computers to anticipate subsequent road scenarios based on visual information about current and previous states.
Another example of human-computer interaction are computer simulations meant to predict human behavior based on algorithms. For example, MIT has recently developed an incredibly accurate algorithm to predict the behavior of humans. When tested against television shows, the algorithm was able to predict with great accuracy the subsequent actions of characters. Algorithms and computer simulations like these show great promise for the future of artificial intelligence.
IN HUMAN SENTENCE PROCESSING
Linguistic prediction is a phenomenon in psycholinguistics occurring whenever information about a word or other linguistic unit is activated before that unit is actually encountered. Evidence from eyetracking , event-related potentials , and other experimental methods indicates that in addition to integrating each subsequent word into the context formed by previously encountered words, language users may, under certain conditions, try to predict upcoming words. Predictability has been shown to affect both text and speech processing, as well as speech production. Further, predictability has been shown to have an effect on syntactic, semantic and pragmatic comprehension.
In the study of biology – particularly genetics and neuroscience – predictability relates to the prediction of biological developments and behaviors based on inherited genes and past experiences.
Significant debate exists in the scientific community over whether or not a person's behavior is completely predictable based on their genetics. Studies such as the one in Israel, which showed that judges were more likely to give a lighter sentence if they had eaten more recently. In addition to cases like this, it has been proven that individuals smell better to someone with complementary immunity genes, leading to more physical attraction. Genetics can be examined to determine if an individual is predisposed to any diseases, and behavioral disorders can most often be explained by analyzing defects in genetic code. Scientist who focus on examples like these argue that human behavior is entirely predictable. Those on the other side of the debate argue that genetics can only provide a predisposition to act a certain way and that, ultimately, humans possess the free will to choose whether or not to act.
Animals have significantly more predictable behavior than humans. Driven by natural selection, animals develop mating calls, predator warnings, and communicative dances. One example of these engrained behaviors is the Belding's ground squirrel, which developed a specific set of calls that warn nearby squirrels about predators. If a ground squirrel sees a predator on land it will elicit a trill after it gets to safety, which signals to nearby squirrels that they should stand up on their hind legs and attempt to locate the predator. When a predator is seen in the air, a ground squirrel will immediately call out a long whistle, putting himself in danger but signaling for nearby squirrels to run for cover. Through experimentation and examination scientists have been able to chart behaviors like this and very accurately predict how animals behave in certain situations.
IN POPULAR CULTURE
The study of predictability often sparks debate between those who believe humans maintain complete control over their free-will and those who believe our actions are predetermined. However, it is likely that neither Newton nor Laplace saw the study of predictability as relating to determinism.
One example of prediction techniques is tarot cards. Tarot cards have been used for hundreds of years to help in determining the future. "Fortune tellers" have been traced through history back to the Ancient Egyptians, however the earliest complete record dates only to the 18th century.
Tasseography is a divination method, typically utilizing tea leaves or coffee grounds. Western tasseography first started in medieval Europe, where fortune tellers would interpret splatters of wax, lead, and various other molten substances. When the Dutch brought tea from China in the seventeenth century, this evolved into tea tasseography. Tasseography is typically performed in a bright colored cup to contrast with the dark tea leaves or coffee grounds. The bright colors symbolize good fortunes while the dark color symbolizes misfortunes.
As climate change and other weather phenomenon become more common,
the predictability of climate systems becomes more more important. The
THE SPRING PREDICTABILITY BARRIER