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current_version = 4.1.25 | ||
current_version = 4.1.26 | ||
commit = False | ||
tag = False | ||
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[metadata] | ||
name = Delphi Development | ||
version = 4.1.25 | ||
version = 4.1.26 | ||
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[options] | ||
packages = | ||
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--- | ||
title: Youtube Survey | ||
parent: Inactive Signals | ||
grand_parent: COVIDcast Main Endpoint | ||
--- | ||
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[//]: # (code at https://github.com/cmu-delphi/covid-19/tree/deeb4dc1e9a30622b415361ef6b99198e77d2a94/youtube) | ||
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# Youtube Survey | ||
{: .no_toc} | ||
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* **Source name:** `youtube-survey` | ||
* **Earliest issue available:** May 01, 2020 | ||
* **Number of data revisions since May 19, 2020:** 0 | ||
* **Date of last change:** Never | ||
* **Available for:** state (see [geography coding docs](../covidcast_geography.md)) | ||
* **Time type:** day (see [date format docs](../covidcast_times.md)) | ||
* **License:** [CC BY-NC](../covidcast_licensing.md#creative-commons-attribution-noncommercial) | ||
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## Overview | ||
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This data source is based on a short survey about COVID-19-like illness | ||
run by the Delphi group at Carnegie Mellon. | ||
[Youtube directed](https://9to5google.com/2020/04/29/google-covid-19-cmu-research-survey/) | ||
a random sample of its users to these surveys, which were | ||
voluntary. Users age 18 or older were eligible to complete the surveys, and | ||
their survey responses are held by CMU. No individual survey responses are | ||
shared back to Youtube. | ||
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This survey was a pared-down version of the | ||
[COVID-19 Trends and Impact Survey (CTIS)](../../symptom-survey/), | ||
collecting data only about COVID-19 symptoms. CTIS is much longer-running | ||
and more detailed, also collecting belief and behavior data. CTIS also reports | ||
demographic-corrected versions of some metrics. See our | ||
[surveys page](https://delphi.cmu.edu/covid19/ctis/) for more detail | ||
about how CTIS works. | ||
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The two surveys report some of the same metrics. While nominally the same, | ||
note that values from the same dates differ between the two surveys for | ||
[unknown reasons](#limitations). | ||
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As of late April 2020, the number of Youtube survey responses we received each | ||
day was 4-7 thousand. This was not enough coverage to report at finer | ||
geographic levels, so this indicator only reports at the state level. The | ||
survey ran from April 21, 2020 to June 17, 2020, collecting about 159 | ||
thousand responses in the United States in that time. | ||
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We produce [influenza-like and COVID-like illness indicators](#ili-and-cli-indicators) | ||
based on the survey data. | ||
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## Table of Contents | ||
{: .no_toc .text-delta} | ||
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1. TOC | ||
{:toc} | ||
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## Survey Text and Questions | ||
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The survey contains the following 5 questions: | ||
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1. In the past 24 hours, have you or anyone in your household experienced any of the following: | ||
- (a) Fever (100 °F or higher) | ||
- (b) Sore throat | ||
- (c) Cough | ||
- (d) Shortness of breath | ||
- (e) Difficulty breathing | ||
2. How many people in your household (including yourself) are sick (fever, along with at least one other symptom from the above list)? | ||
3. How many people are there in your household (including yourself)? | ||
4. What is your current ZIP code? | ||
5. How many additional people in your local community that you know personally are sick (fever, along with at least one other symptom from the above list)? | ||
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## ILI and CLI Indicators | ||
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We define COVID-like illness (fever, along with cough, or shortness of breath, | ||
or difficulty breathing) or influenza-like illness (fever, along with cough or | ||
sore throat) for use in forecasting and modeling. Using this survey data, we | ||
estimate the percentage of people (age 18 or older) who have a COVID-like | ||
illness, or influenza-like illness, in a given location, on a given day. | ||
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| Signals | Description | | ||
| --- | --- | | ||
| `raw_cli` and `smoothed_cli` | Estimated percentage of people with COVID-like illness <br/> **Earliest date available:** 2020-04-21 | | ||
| `raw_ili` and `smoothed_ili` | Estimated percentage of people with influenza-like illness <br/> **Earliest date available:** 2020-04-21 | | ||
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Influenza-like illness or ILI is a standard indicator, and is defined by the CDC | ||
as: fever along with sore throat or cough. From the list of symptoms from Q1 on | ||
our survey, this means a and (b or c). | ||
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COVID-like illness or CLI is not a standard indicator. Through our discussions | ||
with the CDC, we chose to define it as: fever along with cough or shortness of | ||
breath or difficulty breathing. From the list of symptoms from Q1 on | ||
our survey, this means a and (c or d or e). | ||
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Symptoms alone are not sufficient to diagnose influenza or coronavirus | ||
infections, and so these ILI and CLI indicators are *not* expected to be | ||
unbiased estimates of the true rate of influenza or coronavirus infections. | ||
These symptoms can be caused by many other conditions, and many true infections | ||
can be asymptomatic. Instead, we expect these indicators to be useful for | ||
comparison across the United States and across time, to determine where symptoms | ||
appear to be increasing. | ||
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## Estimation | ||
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### Estimating Percent ILI and CLI | ||
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Estimates are calculated using the | ||
[same method as CTIS](./fb-survey#estimating-percent-ili-and-cli). | ||
However, the Youtube survey does not do weighting. | ||
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### Smoothing | ||
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The smoothed versions of all `youtube-survey` signals (with `smoothed` prefix) are | ||
calculated using seven day pooling. For example, the estimate reported for June | ||
7 in a specific geographical area is formed by | ||
collecting all surveys completed between June 1 and 7 (inclusive) and using that | ||
data in the estimation procedures described above. Because the smoothed signals combine | ||
information across multiple days, they have larger sample sizes and hence are | ||
available for more locations than the raw signals. | ||
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## Lag and Backfill | ||
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This indicator has a lag of 2 days. Reported values can be revised for one | ||
day (corresponding to a lag of 3 days), due to how we receive survey | ||
responses. However, these tend to be associated with minimal changes in | ||
value. | ||
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## Limitations | ||
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When interpreting the signals above, it is important to keep in mind several | ||
limitations of this survey data. | ||
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* **Survey population.** People are eligible to participate in the survey if | ||
they are age 18 or older, they are currently located in the USA, and they are | ||
an active user of Youtube. The survey data does not report on children under | ||
age 18, and the Youtube adult user population may differ from the United | ||
States population generally in important ways. We don't adjust for any | ||
demographic biases. | ||
* **Non-response bias.** The survey is voluntary, and people who accept the | ||
invitation when it is presented to them on Youtube may be different from | ||
those who do not. | ||
* **Social desirability.** Previous survey research has shown that people's | ||
responses to surveys are often biased by what responses they believe are | ||
socially desirable or acceptable. For example, if it there is widespread | ||
pressure to wear masks, respondents who do *not* wear masks may feel pressured | ||
to answer that they *do*. This survey is anonymous and online, meaning we | ||
expect the social desirability effect to be smaller, but it may still be | ||
present. | ||
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Whenever possible, you should compare this data to other independent sources. We | ||
believe that while these biases may affect point estimates -- that is, they may | ||
bias estimates on a specific day up or down -- the biases should not change | ||
strongly over time. This means that *changes* in signals, such as increases or | ||
decreases, are likely to represent true changes in the underlying population, | ||
even if point estimates are biased. | ||
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### Privacy Restrictions | ||
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To protect respondent privacy, we discard any estimate that is based on fewer than 100 survey responses. For | ||
signals reported using a 7-day average (those beginning with `smoothed_`), this | ||
means a geographic area must have at least 100 responses in 7 days to be | ||
reported. | ||
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This affects some items more than others. It affects some geographic areas | ||
more than others, particularly areas with smaller populations. This affect is | ||
less pronounced with smoothed signals, since responses are pooled across a | ||
longer time period. | ||
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## Source and Licensing | ||
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This indicator aggregates responses from a Delphi-run survey that is hosted on the Youtube platform. | ||
The data is licensed as [CC BY-NC](../covidcast_licensing.md#creative-commons-attribution-noncommercial). |
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