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Predicting the Present with Google Trends
Thursday, April 2, 2009
Posted by Hal Varian, Chief Economist and Hyunyoung Choi, Decision Support Engineering Analyst
Can Google queries help predict economic activity?
The answer depends on what you mean by "predict."
Google Trends
and
Google Insights for Search
provide a real time report on query volume, while economic data is typically released several days after the close of the month. Given this time lag, it is not implausible that Google queries in a category like "Automotive/Vehicle Shopping" during the first few weeks of March may help predict what actual March automotive sales will be like when the official data is released halfway through April.
That famous economist Yogi Berra once said "It's tough to make predictions, especially about the future." This inspired our approach: let us lower the bar and just try to predict the present.
Our work to date is summarized in a paper called
Predicting the Present with Google Trends
. We find that Google Trends data
can
help improve forecasts of the current level of activity for a number of different economic time series, including
automobile sales
,
home sales
,
retail sales
, and
travel behavior
.
Even predicting the present is useful, since it may help identify "turning points" in economic time series. If people start doing significantly more searches for "Real Estate Agents" in a certain location, it is tempting to think that house sales might increase in that area in the near future.
Our paper outlines one approach to short-term economic prediction, but we expect that there are several other interesting ideas out there. So we suggest that forecasting wannabes download some Google Trends data and try to relate it to other economic time series. If you find an interesting pattern, post your findings on a website and send a link to econ-forecast@google.com. We'll report on the most interesting results in a later blog post.
It has been said that if you put a million monkeys in front of a million computers, you would eventually produce an accurate economic forecast. Let's see how well that theory works ...
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