TABLE I. Examples of Keywords Extracted as the Ground Truth (
), Keywords Identified by the Proposed Method (
), and Keywords Found by Random Selection (
). The Number of Displayed Tweet Communities, the Number of Displayed Keywords From Each Tweet Community, and the Value of
Are 15, 7, and 3, Respectively.
| Ground truth | ||
|---|---|---|
| English translation of keywords | Keywords in Japanese | CC (correlation coefficient) |
| business suspension | 0.67 | |
| official announcement | 0.61 | |
| hand sanitizer gel | 0.61 | |
| hospital | 0.57 | |
| emergency | 0.46 | |
| declaration | 0.46 | |
| state | 0.46 | |
| China | −0.58 | |
| Italy | −0.48 | |
| cruise | −0.48 | |
| princess | −0.44 | |
| diamond | −0.41 | |
 : The asterisk shows incorrectly detected keywords. | ||
| English translation of keywords | Keywords in Japanese | CC (correlation coefficient) |
| business suspension | 0.52 | |
| emergency | 0.44 | |
| declaration | 0.43 | |
| official announcement | 0.41 | |
| * society | * | * 0.40 |
| influence | −0.40 | |
 : The asterisk shows incorrectly detected keywords. | ||
| English translation of keywords | Keywords in Japanese | CC (correlation coefficient) |
| * digital | * | * 0.44 |