ARCH vs GARCH (The Background) #garch #arch #clustering #volatility #mgarch #tgarch #egarch #igarch

Please pardon my gaffes. Referring to “ARCH” as “GARCH” in some cases (lol).
This video simplifies the understanding of the generalised autoregressive conditional heteroscedasticity (GARCH) using an approach that beginners can grasp. The GARCH Modeling series has 9 collections on the following topics: (1) ARCH versus GARCH (Background), (2) Basics of GARCH Modeling, (3) how to estimate a simple GARCH model, (4) ARCH versus GARCH (Estimations), (5) how to estimate GARCH-in-Mean models, (6) how to estimate Threshold GARCH (GJR GARCH) models, (7) how to estimate Exponential GARCH models, (8) GARCH models and diagnostics and (9) how to forecast GARCH volatility. So, what is GARCH? Generalised autoregressive indicates that heteroscedasticity observed over different time periods may be autocorrelated; conditional informs that variance is based on past errors; heteroscedasticity implies the series displays unequal variance. Popularised by Tim Bollerslev in 1986.

Why use GARCH: Models the attitude of investors not only towards expected returns but also towards risk (uncertainty); Relates to economic forecasting and measuring volatility; Techniques  GARCH, GARCH-M, TGARCH, EGARCH, PGARCH, CGARCH, IGARCH and several other extensions; Concerned with modeling the volatility of the variance; Conditional and time-varying variance; Deals with stationary (time-invariant mean) and nonstationary (time-varying mean) variables; Nonstationary  varying mean; Heteroscedastic  varying variance; Concerns financial and macroeconomic time series; Duration  daily, weekly, monthly, quarterly (high frequency data); Financial/economic series  stock prices, oil prices, bond prices, inflation rates, exchange rates, interest rates, GDP, unemployment rates etc. What is conditional variance? The assumption of homoscedasticity (constant variance) is very limiting, hence preferable to examine patterns that allow the variance to depend (conditional) on its history. Volatility Clustering: Periods when large changes are followed by further large changes and periods when small changes are followed by further small changes. Shows wild and calm periods.

Some Lessons Learnt: The time-varying variance is modeled by the procedure called autoregressive conditional heteroscedasticity (ARCH); GARCH simply conveys that the series in question has a time-varying variance (heteroscedasticity) that depends on (conditional on) lagged effects (autocorrelation); GARCH model is intuitively appealing because it explains volatility as a function of the errors. These errors are called “shocks” or “news” by financial analysts. They represent the unexpected!; The larger the shocks, the greater the volatility in the series; Since variance is often used to measure volatility, and volatility is a key element in asset pricing theories, GARCH models have become important in empirical finance; Most financial time series like stock prices, exchange rates, oil prices etc. exhibit random walks in their level form, that is, nonstationary (time-varying means)

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References and Readings: Asteriou and Hall (2016) Applied Econometrics, 3ed; Hill, Griffiths and Lim (2008) Principles of Econometrics, 3ed; Roman Kozhan (2010) Financial Econometrics with EViews; Gujarati and Porter (2009) Basic Econometrics, International Edition; R. Engle, “Autoregressive Conditional Heteroscedasticity with Estimates of the Variance of United Kingdom Inflation,” Econometrica, vol. 50. No. 1, 1982, pp. 987–1007; A. Bera and M. Higgins, “ARCH Models: Properties, Estimation and Testing,” Journal of Economic Surveys, vol. 7, 1993, pp. 305–366; Bollerslev (1986); Amadeus Wennström (2014) Volatility Forecasting Performance: Evaluation of GARCH type volatility models on Nordic equity indices; Bollerslev, T (1986)“Generalised Autoregressive Conditional Heteroscedasticity with Estimates of the Variance of United Kingdom Inflation,” Journal of Econometrica, vol. 31, pp. 307–327; Tsay, R.S. (2002) Analysis of Financial Time Series, John Wiley & Sons, Inc., New York.



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[CrunchEconometrix]

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[jayadanakirti]

thank you Madam, very good and clear explanation, the video sounds also clear.

[wanjadouglas]

This was very helpful as always Ngozi. Good jobs.

[lenku-vinceoosthuizen]

course saving lectures during covid-19 times. Thank you!

[truthrevealed]

You are playing a good role to make us informative about econometrics.

[louissonkey]

Thank you very much Prof. You are a wonderful teacher. May the good Lord increase your knowledge and wisdom in Jesus name.

[sangbaumkang]

The quality of this video is high. I like it.

[belkhir]

Thank you very Much
Please we need explication DCC- GARCH model

[netxxdi]

Mam i have 2 series of returns for 30 days also I have two model linked to each series.Each model has 2 equation one is about returns and second is conditional variance how to decide which stock is better if I am risk averse person .
Pls mam reply very important u are my last hope

[takondwayosia]

How do you find forecasted values for example when you want to forecast from 2020 to 2030

[takondwayosia]

When you have found a model with R squared of 0.54 and adjusted r of 0.50, its signifacant but after you have found autocorelation after testing can you proceed with the model

[ahah]

Dear madam thanks for your effort

I am writing my master thesis but got confused from the published paper on the same topic

If possible for you i would like to know what does ARCH AND GARCH indicate??

In the published papers they mentioned that both ARCH AND GARCH represent the past volatility
Can you please explain the difference ?

Regards