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CFA Level 2
Quantitative Methods

Understanding Trend Models in Time-Series Analysis

Medium Time-series Analysis Trend Models

In a recent analysis of quarterly revenue for a company over the past five years, a financial analyst decided to model the revenue using a linear trend model. The model was expressed in the form:

Revenue = $a + b imes t$

where:

  • $a$ = intercept (the starting revenue at time $t=0$),
  • $b$ = slope (the change in revenue for each unit increase in time),
  • $t$ = time measured in quarters since the beginning of the trend.

After fitting the model, the analyst noted that the slope coefficient ($b$) was positive, indicating an upward trend in the revenue. Given this information, which of the following statements is true regarding the implications of the trend model?

Hint

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