Autoregressive conditional heteroskedasticity — ARCH redirects here. For the children s rights organization, see Action on Rights for Children. In econometrics, AutoRegressive Conditional Heteroskedasticity (ARCH) models are used to characterize and model observed time series. They are used… … Wikipedia
Autoregressive Conditional Heteroskedasticity - ARCH — An econometric term used for observed time series. ARCH models are used to model financial time series with time varying volatility, such as stock prices. The ARCH concept was developed by economist Robert F. Engle, for which he won the 2003… … Investment dictionary
Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) Process — An econometric term developed in 1982 by Robert F. Engle, an economist and 2003 winner of the Nobel Memorial Prize for Economics to describe an approach to estimate volatility in financial markets. There are several forms of GARCH modeling. The… … Investment dictionary
Generalized AutoRegressive Conditional Heteroskedasticity (GARCH) — A statistical model used by financial institutions to estimate the volatility of stock returns. This information is used by banks to help determine what stocks will potentially provide higher returns, as well as to forecast the returns of current … Investment dictionary
autoregressive conditional heteroskedasticity — ( ARCH) A nonlinear stochastic process, where the variance is time varying, and a function of the past variance. ARCH processes have frequency distributions which have high peaks at the mean and fat tails, much like fractal distributions. The… … Financial and business terms
Heteroscedasticity — In statistics, a sequence or a vector of random variables is heteroskedastic, or heteroscedastic, if the random variables have different variances. The complementary concept is called homoskedasticity. The term means differing variance and comes… … Wikipedia
Heteroscedasticity-consistent standard errors — In statistics, a frequent assumption in linear regression is that the disturbances u i have the same variance. When this is not the case, we get heteroskedasticity in the estimated residuals scriptstylewidehat{u i} . Heteroskedasticity consistent … Wikipedia
Newey–West estimator — A Newey–West estimator is used in statistics and econometrics to provide an estimate of the covariance matrix of the parameters of a regression type model when this model is applied in situations where the standard assumptions of regression… … Wikipedia
Predictive analytics — encompasses a variety of techniques from statistics and data mining that analyze current and historical data to make predictions about future events. Such predictions rarely take the form of absolute statements, and are more likely to be… … Wikipedia
ARCH-Modell — Das von Robert F. Engle in den 80er Jahren entwickelte ARCH Modell (autoregressive conditional heteroskedasticity) beschrieb ursprünglich die Entwicklung der Volatilität. Es geht von der Annahme aus, dass die bedingte Varianz der zufälligen… … Deutsch Wikipedia
