JMIR J Med Internet Res Journal of Medical Internet Research 1438-8871 JMIR Publications Toronto, Canada v19i12e347 29258059 10.2196/jmir.8099 Corrigenda and Addenda Corrigenda and Addenda Correction: Seeing the “Big” Picture: Big Data Methods for Exploring Relationships Between Usage, Language, and Outcome in Internet Intervention Data Eysenbach Gunther Carpenter Jordan PhD 1 http://orcid.org/0000-0001-6918-6286 Crutchley Patrick BSE 1 2 http://orcid.org/0000-0003-4400-9309 Zilca Ran D MSc 3 http://orcid.org/0000-0001-8521-5438 Schwartz H Andrew PhD 2 4 http://orcid.org/0000-0002-6383-3339 Smith Laura K BA 1 http://orcid.org/0000-0002-4020-5524 Cobb Angela M BA 5 http://orcid.org/0000-0001-5442-558X Parks Acacia C PhD 3 5
Department of Psychology Hiram College Bates Hall 215 11715 Garfield Road Hiram, OH, 44234 United States 1 330 569 5229 1 330 569 5398 parksac@hiram.edu
http://orcid.org/0000-0001-6643-0116 1 Positive Psychology Center University of Pennsylvania Philadelphia, PA United States 2 Penn Medicine Social Media and Health Innovation Lab, Penn Medicine Center for Health Care Innovation University of Pennsylvania Philadelphia, PA United States 3 Happify New York, NY United States 4 Computer Science Stony Brook University Stony Brook, NY United States 5 Department of Psychology Hiram College Hiram, OH United States Corresponding Author: Acacia C Parks parksac@hiram.edu 122017 19 12 2017 19 12 e347 25 5 2017 20 6 2017 ©Jordan Carpenter, Patrick Crutchley, Ran D Zilca, H Andrew Schwartz, Laura K Smith, Angela M Cobb, Acacia C Parks. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 19.12.2017. 2017

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 http://www.jmir.org/2016/8/e241/

The authors of, “Seeing the 'Big' Picture: Big Data Methods for Exploring Relationships Between Usage, Language, and Outcome in Internet Intervention Data” (J Med Internet Res 2016;18(8):e241) would like to make changes to the following areas.

In the results section of the abstract

The first sentence of the results subheading in the abstract “On a measure of positive emotion, the average user improved 1.38 points per week (SE 0.01, t122,455=113.60, P<.001, 95% CI 1.36–1.41), about a 11% increase over 8 weeks.” This should be replaced with: “On a measure of positive emotion, the average user improved 1.38 points per week (SE 0.01, t122,455=113.60, P<.001, 95% CI 1.36–1.41), about a 27% increase over 8 weeks.”

The third sentence in the results subheading of the abstract “This estimate predicted that a given user would report positive emotion 1.26 points (or 1.26%) higher after a 2-week period when they used Happify daily than during a week when they didn’t use it at all.” This should be replaced with: “This estimate predicted that a given user would report positive emotion 1.26 points higher after a 2-week period when they used Happify daily than during a week when they didn’t use it at all.”

In the Study 1 Results section

The last sentence in the second paragraph in the Study 1 Results section “This suggests an average overall improvement of 11.04 points, or about 11%, over the course of 8 weeks.” This should be replaced with: “This suggests an average overall improvement of 11.04 points, or about 27%, over the course of 8 weeks.”

The second sentence in the fourth paragraph in the Study 1 Results section “This estimate predicted that a given user would report positive emotion that would be 1.26 points (or 1.26%) higher after a 2-week period when they used Happify daily than after a week when they didn’t use it at all.” This should be replaced with: “This estimate predicted that a given user would report positive emotion that would be 1.26 points higher after a 2-week period when they used Happify daily than after a week when they didn’t use it at all.”

In the general Discussion section

The last sentence in the second paragraph in the Study 1 Results section “This suggests an average overall improvement of 11.04 points, or about 11%, over the course of 8 weeks.” This should be replaced with: “This suggests an average overall improvement of 11.04 points, or about 27%, over the course of 8 weeks.”

While the errors do not impact the general findings of the original publication, remediation of these errors will add clarity to the interpretation of the results, as well as accurately represent the magnitude of the results.

The corrected article will appear in the online version of the paper on the JMIR website on December 19, 2017, together with the publication of this correction notice. Because this was made after submission to PubMed Central, the corrected article also has been re-submitted to PubMed Central.