Working Paper: NBER ID: w28963
Authors: Tim De Silva; David Thesmar
Abstract: This paper quantifies the amount of noise and bias in analysts’ forecast of corporate earnings at various horizons. We first show analyst forecasts outperform statistical forecasts at short-horizons, but underperform at longer horizons. We next decompose the relative accuracy of these forecasts into three components: (i) noise, (ii) bias and (iii) analysts’ information advantage over statistical forecasts. We find the information advantage is constant across forecasting horizons, while both noise and bias are increase linearly. We then show most existing models lack a mechanism to account for these facts. To generate such a mechanism, we consider a parsimonious variant of the model of Patton and Timmermann (2010) with a noisy cognitive default and show it quantitatively fits the data. The intuition underlying this model is that forecasters rely on their biased and noisy defaults more at longer horizons, as rational forecasts are less accurate. This model also quantitatively matches two non-targeted empirical relationships: (i) analyst disagreement increases with horizon and (ii) noise is an increasing function of volatility.
Keywords: analyst forecasts; noise; bias; corporate earnings
JEL Codes: D84; D91
Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.
| Cause | Effect |
|---|---|
| analyst forecasts outperform statistical forecasts at short horizons (G17) | forecast accuracy (C53) |
| analyst forecasts underperform statistical forecasts at longer horizons (G17) | forecast accuracy (C53) |
| longer horizons exacerbate forecasting errors (G17) | forecast accuracy (C53) |
| noise increases linearly with horizon (C58) | forecasting errors (C53) |
| bias increases linearly with horizon (C51) | forecasting errors (C53) |
| analysts rely more on biased and noisy defaults at longer horizons (G41) | forecast accuracy (C53) |
| analyst disagreement increases with horizon (D80) | forecast accuracy (C53) |
| noise is an increasing function of volatility (C58) | forecasting errors (C53) |