Table 3.
Descriptive statistics of monthly intersections (TextRank SketchEngine) of sets of extracted keywords (full sets, n = 1,000 per set)
| Type | Sample (%) | Year | M | SD | min | 25% | 50% | 75% | max | M diff.a (%) |
|---|---|---|---|---|---|---|---|---|---|---|
| Keywords | 0.1 | 2020 | 35.00 | 2.09 | 31.60 | 33.83 | 35.25 | 36.00 | 38.80 | |
| Keywords | 1.0 | 2020 | 33.53 | 2.31 | 30.30 | 32.60 | 33.30 | 34.20 | 38.80 | 1.47 |
| Keywords | 0.1 | 2021 | 32.38 | 2.05 | 30.80 | 32.50 | 33.95 | 34.65 | 38.10 | |
| Keywords | 1.0 | 2021 | 33.82 | 1.67 | 31.30 | 32.52 | 33.55 | 34.75 | 37.20 | 1.44 |
| Keyphrases | 0.1 | 2020 | 24.00 | 2.27 | 20.20 | 22.55 | 23.65 | 25.75 | 27.50 | |
| Keyphrases | 1.0 | 2020 | 21.60 | 2.09 | 18.80 | 20.40 | 20.70 | 22.98 | 25.40 | 2.4 |
| Keyphrases | 0.1 | 2021 | 21.80 | 2.19 | 19.40 | 20.58 | 21.20 | 22.03 | 26.63 | |
| Keyphrases | 1.0 | 2021 | 21.50 | 2.79 | 17.30 | 20.02 | 20.70 | 22.15 | 27.63 | 0.3 |
“M diff.” is the difference of means between the 0.1% and the 1% samples.