Time Series Analysis ARIMA Models

Question 1

What does the 'I' in ARIMA stand for?

Accepted Answer

Integrated

Answer

Inverse

Answer

Iterative

Answer

Indexed

Question 2

In an ARIMA(p,d,q) model, what does the parameter 'p' represent?

Accepted Answer

Order of the autoregressive component

Answer

Number of differences

Answer

Order of the moving average component

Answer

Seasonal period

Question 3

Which plot is most commonly used to determine the MA order 'q' in an ARIMA model?

Accepted Answer

Autocorrelation Function (ACF)

Answer

Partial Autocorrelation Function (PACF)

Answer

Residual plot

Answer

Spectral density plot

Question 4

What does the PACF plot help identify in an ARIMA model?

Accepted Answer

The AR order 'p'

Answer

The MA order 'q'

Answer

The differencing order 'd'

Answer

The seasonal period

Question 5

What is the purpose of differencing in an ARIMA model?

Accepted Answer

To achieve stationarity

Answer

To remove seasonality only

Answer

To increase autocorrelation

Answer

To normalize residuals

Question 6

An ARIMA(0,1,0) model is equivalent to which simple forecasting method?

Accepted Answer

Random walk

Answer

Simple moving average

Answer

Linear regression

Answer

Exponential smoothing