HappyDB: A Corpus of 100,000 Crowdsourced Happy Moments Part of the work was done while Asai, Evensen, and Xu were at Recruit Institute of Technology.
Table 8: Percentage of happy moments in each topic, separated by reflection period. All differences between the columns are statistically significant at p<10−3 except for pets, work, and none.
['[BOLD] Topics', '[BOLD] % of sentences in topic  [BOLD] 24 Hours Reflection', '[BOLD] % of sentences in topic  [BOLD] 3 Months Reflection']
Topic Mentions by Reflection Period : We analyzed the incidence of different topics separately for each reflection period. For instance, we observe that the categories “food” and “entertainment” have higher percentage of coverage in 24 hour (19.2%, and 9.6%) compared to the 3 months reflection period (13.1%, and 7.8%). Naturally, people are more likely to talk about a meal or a movie because these are more frequent daily events that are more likely to be remembered if they occurred recently. When people are asked to reflect on the past 3 months, they tend to remember events that are more prominent such as school, big achievements, and time spent with friends and family.