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Copy file name to clipboardExpand all lines: docs/api/covidcast-signals/google-symptoms.md
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## Overview
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This data source is based on the [COVID-19 Search Trends symptoms
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dataset](http://goo.gle/covid19symptomdataset). Using
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dataset](https://console.cloud.google.com/marketplace/product/bigquery-public-datasets/covid19-search-trends?q=search&referrer=search&project=southern-guild-298314). Using
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this search data, we estimate the volume of searches mapped to symptom sets related
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to COVID-19. The resulting daily dataset for each region shows the average relative frequency of searches for each symptom set. The signals are measured in arbitrary units that are normalized for overall search users in the region and scaled by the maximum value of the normalized popularity within a geographic region across a specific time range. **Values are comparable across signals in the same location but NOT across geographic regions**. For example, within a state, we can compare `s01_smoothed_search` and `s02_smoothed_search`. However, we cannot compare `s01_smoothed_search` between states. Larger numbers represent increased relative popularity of symptom-related searches.
The number of POIs coded as bars is much smaller than the number of POIs coded as restaurants.
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SafeGraph's Weekly Patterns data consistently lacks data on bar visits for Alaska, Delaware, Maine, North Dakota, New Hampshire, South Dakota, Vermont, West Virginia, and Wyoming.
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SafeGraph's [Weekly Patterns](https://docs.safegraph.com/docs/weekly-patterns) data consistently lacks data on bar visits for Alaska, Delaware, Maine, North Dakota, New Hampshire, South Dakota, Vermont, West Virginia, and Wyoming.
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For certain dates, bar visits data is also missing for District of Columbia, Idaho and Washington. Restaurant visits data is available for all of the states, as well as the District of Columbia and Puerto Rico.
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### Lag
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## Limitations
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SafeGraph's Social Distancing Metrics and Weekly Patterns are based on mobile devices that are members of SafeGraph panels, which is not necessarily the same thing as measuring the general public. These counts do not represent absolute counts, and only count visits by members of the panel in that region. This can result in several biases:
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SafeGraph's [Social Distancing Metrics](https://docs.safegraph.com/docs/social-distancing-metrics) and [Weekly Patterns](https://docs.safegraph.com/docs/weekly-patterns) are based on mobile devices that are members of SafeGraph panels, which is not necessarily the same thing as measuring the general public. These counts do not represent absolute counts, and only count visits by members of the panel in that region. This can result in several biases:
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***Geographic bias.** If some regions have a greater density of SafeGraph panel members as a percentage of the population than other regions, comparisons of metrics between regions may be biased. Regions with more SafeGraph panel members will appear to have more visits counted, even if the rate of visits in the general population is the same.
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***Demographic bias.** SafeGraph panels may not be representative of the local population as a whole. For example, [some research suggests](https://doi.org/10.1145/3442188.3445881) that "older and non-white voters are less likely to be captured by mobility data", so this data will not accurately reflect behavior in those populations. Since population demographics vary across the United States, this can also contribute to geographic biases.
- Temporal Resolution: Weekly from 2003w40 until 2015w32
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- Spatial Resolution: National, [HHS regions](http://www.hhs.gov/iea/regional/) ([1+10](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/regions.txt)); by state/territory ([50+1](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/states.txt)); and by city ([97](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/cities.txt))
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- Wikipedia Article: <https://en.wikipedia.org/wiki/Google_Flu_Trends>
Copy file name to clipboardExpand all lines: docs/api/nidss_dengue.md
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| Parameter | Description | Type |
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| --- | --- | --- |
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|`epiweeks`| epiweeks |`list` of epiweeks |
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|`locations`|locations|`list` of [region](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/nidss_regions.txt) and/or [location](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/nidss_locations.txt) labels |
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|`locations`|**regions** (nationwide, central, eastern, Kaoping, northern, southern, Taipei) and **counties or cities** (Changhua County, Chiayi City, Chiayi County, Hsinchu City, Hsinchu County, Hualien County, Kaohsiung City, Keelung City, Kinmen County, Lienchiang County, Miaoli County, Nantou County, New Taipei City, Penghu County, Pingtung County, Taichung City, Tainan City, Taipei City, Taitung County, Taoyuan City, Yilan County, Yunlin County)|`list` of [region](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/nidss_regions.txt) and/or [location](https://github.com/cmu-delphi/delphi-epidata/blob/main/labels/nidss_locations.txt) labels |
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