What is Google Correlate?
Google Correlate is a tool on Google Trends
which enables you to find queries with a similar pattern to a target data
series. The target can either be a real-world trend that you provide (e.g., a
data set of event counts over time) or a query that you enter.
What information is provided by Google Correlate?
Google Correlate uses web search activity data to find
queries with a similar pattern to a target data series. The results can be
viewed on the Google Correlate website or downloaded as a CSV file for further
How is Google Correlate different from Google Trends or Google Insights for
Google Correlate is like Google Trends in reverse. With
Google Trends, you type in a query and get back a data series of activity (over
time or in each US state). With Google Correlate, you enter a data series (the
target) and get back a list of queries whose data series follows a similar
How up to date is the information provided by Google Correlate?
Google Correlate contains web search activity data from
January 2003 to present. This data is updated weekly.
What’s the difference between comparing US states and comparing time
Google Correlate lets you search in two different ways. The
US states option lets you find queries which have similar state-by-state
patterns. The time series option lets you find queries that have similar
patterns across time. For more information, see the
Google Correlate Tutorial.
How can I use the information I find on Google Correlate?
You're free to use any of the information you find on
Google Correlate, subject to the
Google Terms of Service. Please attribute it to Google as follows:
"Data Source: Google Correlate (http://www.google.com/trends/correlate)
What are the units for the data in the chart and CSV file download?
The units are standard deviations above mean. If you
download any data, you should find that all of the time series have mean 0 and
standard deviation 1. For more information see this Wikipedia article on
How should I format my CSV file for upload to Correlate?
For us-weekly data, your csv should be of the form:
where YYYY-MM-DD are weeks starting on Sundays.
For us-states data, your csv should be of the following
Note that for both CSV files, comment lines (starting with
a # character) are ignored.
How will Google use data sets that I upload to Google Correlate?
We will not use any of your content for any purpose except
to provide you with the Google Correlate Service, monitor traffic and detect
spam and fraud. See the Terms of Service for more
This tool makes search information public. What about my personal search
Your personal search data remains safe and private. Our
graphs are based on aggregated data from millions of Google searches over time.
Moreover, the results Google Correlate displays are produced by an automated
system. See our
Privacy Center for more about how we use search query data.
How do you determine the location of a query?
Google Correlate uses IP address information from our
server logs to make a best guess about where queries
Can you tell more about what Google does with my personal search data?
Please read more at the
Google Privacy FAQ.
How has sampling changed for Google Correlate?
In December 2011, we added support for time
series correlations on a number of new countries. As part of this
change, we reduced our sample size for US states and US time series to
match that of the other countries. While this does not have much of an
effect on popular queries, it may cause a noticeable increase in variance for
queries with lower volumes.
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A feature request? A question not answered by this FAQ?
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