Univariate Time-Series Analysis Quiz

What is the main assumption for ARMA modelling at this level?

• Explosive model condition

• Stationarity condition

• Non-stationarity condition

• Invertibility condition for AR models

What is the purpose of Regression in ARMA modelling?

• To identify outliers in the data

• To calculate the mean of the series

• To analyze cross-sectional data

• To forecast future values of yt

What is the Box-Jenkin Methodology used for?

• Model identification, estimation, diagnostic checking, and forecasting

• Time-series decomposition

• Data visualization

• Statistical hypothesis testing

What is the purpose of Step 1 in the Box-Jenkin Methodology?

• Identification

• Estimation & Selection

• Forecast

• Diagnostic Tests

What is the Ljung Box Test used for in Step 2 of the Box-Jenkin Methodology?

• Testing for multicollinearity

• Testing for heteroscedasticity

• Testing for serial correlation

• Testing for normality of residuals

What criteria are used to select the best model in Step 2 of the Box-Jenkin Methodology?

• Highest value of SIC

• Highest volatility

• Lowest adjusted R.sq

• Lowest value of AIC

What is the purpose of the Absolute value of the coefficient(s) in ARMA models?

• To prevent model instability

• To ensure the model is explosive

• To check for multicollinearity

• To determine the model's volatility

What is the significance of the PACF in ARMA modelling?

• It measures the autocorrelation at time k after controlling for intermediate lags

• It measures the autocorrelation at time k without controlling for intermediate lags

• It measures the correlation between the dependent and independent variables

• It measures the cross-correlation between two variables

What is the purpose of Step 4 in the Box-Jenkin Methodology?

• Estimation & Selection

• Diagnostic Tests

• Forecast

• Model identification

What should be done if the model passes the residual diagnostic test?

• It should be discarded

• It should be used for backtesting

• It should be re-estimated

• It can be deemed fit for use and forecasting