time-series

  1. A

    Seasonal differencing from Chapter 11

    Statement as per the book official GARP book (chapter 11, seasonal differencing): How is this equation MA(1)? Isnt this an MA(4) with theta=-1? And how is this covariance stationary? The characteristic equation is 1+z^4 with complex root of abs value of unity.
  2. David Harper CFA FRM

    P1.T2.21.2. Unit roots and Dickey-Fuller

    Learning objectives: Explain the challenges of modeling time series containing unit roots. Describe how to test if a time series contains a unit root. Explain how to construct an h-step-ahead point forecast for a time series with seasonality. Calculate the estimated trend value and form an...
  3. D

    P1.T2.QA Ch.11 Non Stationary Time Series - Non Linear Trends

    Hello, I would like some further clarification on the log-linear function that appears on page 5 of the Ch.11 materials: GARP's Ch.11 materials writes the formula differently so i'm having some trouble reconciling. Forgive me if this should be something basic or intuitive (I don't remember...
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