Google Flu Botched Predictions, Overestimated Flu Amid Record Season
February 18, 2013 11:44 AM
comment(s) - last by
Typically accurate algorithm may need tweaking to deal with new trends
Launched in 2008
Google Flu Trends
is one of Google Inc.'s (
) most intriguing internet services. Leveraging Google's mastery of data mining and industry-leading search engine position, the system injects data on health-related searches into a complex model which spits out an estimation of the number of people in each region that are infected with the flu virus.
I. Flu Trends' Bad Forecast
The system performs extraordinarily well, typically matching up closely with data from the
Centers for Disease Control
(CDC). The system typically is several days ahead of CDC predictions in 29 countries and today also tracks a second disease -- dengue.
But this flu season was
a rough one
for the Google service. Google badly over predicted the Christmas peak of flu season, estimating that over 10 percent of the U.S. population had flu, versus the CDC's data, which showed only around 6 percent had it.
Google Flu overpredicted, while Flu Near You underpredicted. [Image Source: Nature]
So what happened?
Experts believe part of the problem was public fear influencing search behavior in an unusual way. The flu season got off to its earliest seasonal start in nearly a decade, starting in November and peaking in December. Of the three major flu virus strains, the most virulent strain -- H3N2n -- dominated, as in the severe 2003 outbreak.
There were multiple deaths, particularly among the elderly from the outbreak. As a result, the mass media latched onto the story and focus a great deal of coverage on the flu -- more so than usual. Experts say that may have led people to increase searches for flu terms, even if they didn't have flu.
It was also a bad season for norovirus outbreaks, which may have led to people searching for flu terms. Norovirus is a separate pathogen that manifests itself via intestinal symptoms. However, many in the public mistake norovirus infections for flu.
II. Self-Tracking Efforts Also Miss
Professor John Brownstein
that the miss by Google shows the difficulty in adapting algorithms to new variables. He comments, "You need to be constantly adapting these models, they don’t work in a vacuum. You need to recalibrate them every year."
Professor Brownstein helps maintain "
Flu Near You
Boston Children's Hospital
project which tracks flu in the U.S. via volunteer self-reporting. The 2011 program tracks a sample set of 70,000 people and has 46,000 participants (who report on their own health and health of family members).
Tracking the flu-virus in real time is a daunting challenge. [Image Source: Navco]
To Google's credit, Flu Near You missed nearly as badly, underestimating the peak infection rate. It peaked around a little over 4 percent. It's unclear why that underestimation happened.
Digital tracking of influenza-like illness (ILI) -- symptoms such as fever and sinus issues -- first began in 1985 in France with the creation of the Sentinelles network. Today France's GrippeNet.fr continues that tradition. Similar to Flu Near You, GrippeNet uses self-reporting from volunteers and has 5,500 participants.
The CDC's tracking comes directly from a network of 2,700 health institutions, which cover 30 million patients.
III. What About Twitter Tracking?
The misses of Flu Near You and Google Flu Trends open the door to new analysis projects. A pair of new efforts --
-- look to track Twitter posts to determine flu rates. Johns Hopkins University Professor Michael Paul argues that Twitter monitoring may offer less noise than search term monitoring, while offering big sample sets than self-monitoring.
He comments, "I suspect that passive monitoring of social media will always yield more data than systems that rely on people to actively respond to surveys, like Flu Near You."
Some are turning to Twitter for flu tracking.
But some are skeptical of Twitter-mining.
, head of the CDC’s Influenza Surveillance and Outbreak Response Team, argues that Twitter crowdsourcing is less effect that search-term efforts, because Twitter's userbase tends to be younger, less reliable users. She comments, "The Twitter analyses have much less promise."
The 2012 miss was the
worst since 2009
for Google, which led to some major algorithmic adjustments. In 2009 Google under predicted the H1N1 swine flu outbreak. That mistake was the subject of a
paper entitled "
Assessing Google Flu Trends Performance in the United States during the 2009 Influenza Virus A (H1N1) Pandemic
This article is over a month old, voting and posting comments is disabled
RE: Why should Google be wrong, and not the others?
2/19/2013 12:52:37 PM
Not to disagree with your point, but if you get the flu no amount of OTC pain killers will keep you ambulatory. If you can take two Advil and get on with your day then you don't have the flu.
"A politician stumbles over himself... Then they pick it out. They edit it. He runs the clip, and then he makes a funny face, and the whole audience has a Pavlovian response." -- Joe Scarborough on John Stewart over Jim Cramer
Google Helps to Track Swine Flu, Twitter Catches Criticism
April 28, 2009, 11:29 AM
Google Predicts the Flu
November 12, 2008, 10:10 AM
SpaceX Falcon 9's Seventh Supply Mission to ISS Ends w/ Fiery Stage 1 Explosion
June 28, 2015, 1:10 PM
Cool Science Video: Glowing Millipede Prowls the Nevada Desert
May 18, 2015, 12:00 PM
Newly Discovered Costa Rican Glass Frog is Kermit's Doppelgänger
April 22, 2015, 11:26 AM
Researchers Hope to Find "Exotic" Lifeforms Inside Crater of Dinosaur Killing Meteor
April 14, 2015, 8:47 PM
Mathematician's Sociological Formulation May Explain the "Hipster Paradox"
April 14, 2015, 1:13 PM
Cool Science Video: This is What a McDonald's Burger Looks Like in Your Stomach
April 7, 2015, 1:43 PM
Most Popular Articles
Windows XP, Vista Users Can Get Free Windows 10 Upgrade Thanks to Loophole
June 23, 2015, 2:23 PM
Under the Hood: Digging Into Sony's New CUH-1200 PS4, 1 TB Ultimate Player Ed.
June 23, 2015, 10:33 AM
U.S. Navy Spends $9M USD to Cling to Windows XP, Office 2003
June 24, 2015, 2:03 PM
Xbox Outsold 108-to-1 By PS4 in Japan, Weekly Sales Fall to 100 Units
June 22, 2015, 1:54 PM
SanDisk's 200GB microSDXC Card Turns Smartphones Into Enviable PMPs
June 26, 2015, 2:02 PM
Latest Blog Posts
Sceptre Airs 27", 120 Hz. 1080p Monitor/HDTV w/ 5 ms Response Time for $220
Dec 3, 2014, 10:32 PM
Costco Gives Employees Thanksgiving Off; Wal-Mart Leads "Black Thursday" Charge
Oct 29, 2014, 9:57 PM
"Bear Selfies" Fad Could Turn Deadly, Warn Nevada Wildlife Officials
Oct 28, 2014, 12:00 PM
The Surface Mini That Was Never Released Gets "Hands On" Treatment
Sep 26, 2014, 8:22 AM
ISIS Imposes Ban on Teaching Evolution in Iraq
Sep 17, 2014, 5:22 PM
More Blog Posts
Copyright 2015 DailyTech LLC. -
Terms, Conditions & Privacy Information