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Section 1 details data collection and the methods for preprocessing, emotion labeling, and topic modeling. Section 2 reports results on emotion patterns, topic clusters, and cross-cultural comparisons. Section 3 interprets these findings through cultural theories and discusses practical implications, concluding with limitations and directions for future work.
J Med Internet Res 2026;28:e84648
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As part of the vignettes, the information provided to respondents varied along three factors: (1) topic, (2) financial incentive, and (3) sponsor. While the experimental factors topic and financial incentive were both informed by the economic participation theory as psychological participation costs were thought to be higher for more stigmatized diseases (eg, HIV) than for less stigmatized diseases (eg, diabetes), the factor sponsor was informed by the theory of contextual integrity.
J Med Internet Res 2025;27:e68472
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Topic modeling, a machine learning algorithm was used to recognize patterns in the platform data. Nonnegative matrix factorization (NMF) was used as a topic modeling technique to analyze the data set and identify topics with weighted keywords [17,18]. The number of topics was determined by evaluating topic coherence scores and model stability [19,20]. Model stability was assessed using Jaccard similarity to reduce the overlap of topics.
JMIR Cancer 2025;11:e58834
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Topic modeling allows organizing documents into clusters based on similarity and identifying abstract topics covered by similar papers. In Lite Rev, it allows the user to broaden the search strategy and get a more comprehensive and organized overview of the corpus. It can also help to quickly discard a pool of papers when searching the literature for a specific topic and significantly reduce the amount of text to verify manually.
J Med Internet Res 2023;25:e39736
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Public Trust in Artificial Intelligence Applications in Mental Health Care: Topic Modeling Analysis
We took the coherence score as an assessment metric to evaluate how good a given topic model was and determine the optimal number of topics [46] that needed to be extracted from the user reviews. Topic coherence is a qualitative method used to score the coherence of a given topic [46]. It measures the semantic similarity between words with high scores in a topic to determine the consistency of a single topic, improving the semantic understanding of the topic [36].
JMIR Hum Factors 2022;9(4):e38799
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RQ3a: Do online opinion leaders and structural hole spanners tend to act as echoers or bridgers in topic dissemination?
RQ3b: Do online opinion leaders and structural hole spanners tend to act as echoers or bridgers in attitude interaction?
RQ4a: Do these key users acting as echoers in topic dissemination tend to play the same role in attitude interaction?
RQ4b: Do these key users acting as bridgers in topic dissemination tend to play the same role in attitude interaction?
J Med Internet Res 2022;24(11):e40701
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Tweets that contained any of the following keywords “vaccination,” “vaccinations,” “vaccine,” “vaccines,” “immunization,” “vaccinate,” and “vaccinated” were selected for further analysis (eg, topic modeling and sentiment analysis).
I would suggest that the study might be enhanced by including additional keyword searches for vaccination synonyms identified by a method such as the Continuous Bag of Words (CBOW) word2vec model [2].
J Med Internet Res 2022;24(2):e31978
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For example, couples can compose a topic list with questions they want to ask during their upcoming physician’s appointment.
Care providers: an overview of the whole treatment team is provided through photographs, with an individual’s primary care provider on top. Users can ask medical questions to the treatment team, and they are answered within 24 hours.
Forum: patients can communicate with peers on the forum. The forum is supervised by a clinician.
J Med Internet Res 2021;23(8):e25389
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COVID-19 Vaccine–Related Discussion on Twitter: Topic Modeling and Sentiment Analysis
We chose 16 as the topic number for our final topic model, based on two considerations: first, the topic number 16 corresponded to the highest coherence score (see Multimedia Appendix 1); second, in comparison with topics that appeared in the other topic models, the topic model with 16 topics strikes a balance between one too narrow that the model would risk excluding important topics and one so broad that it would dilute the main focus.
The top 8 terms from each of the 16 topics were generated.
J Med Internet Res 2021;23(6):e24435
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