Table 12 Calculation of cited half-life (CHL)
From: Assessment of technological level of stem cell research using principal component analysis
Time lag (years) | Citation frequency (%) | Cumulative citation frequency (%) |
|---|---|---|
Y + 0 | 0.0 | 0.0 |
Y + 1 | 0.8 | 0.8 |
Y + 2 | 2.4 | 3.1 |
Y + 3 | 3.3 | 6.5 |
Y + 4 | 5.3 | 11.8 |
Y + 5 | 4.8 | 16.6 |
Y + 6 | 6.9 | 23.5 |
Y + 7 | 7.7 | 31.3 |
Y + 8 | 6.8 | 38.0 |
Y + 9 | 9.6 | 47.6 |
Y + 10 | 10.7 | 58.4 |
Y + 11 | 8.2 | 66.6 |
Y + 12 | 7.8 | 74.4 |
Y + 13 | 7.7 | 82.1 |
Y + 14 | 6.1 | 88.2 |
Y + 15 | 5.0 | 93.1 |
Y + 16 | 2.8 | 96.0 |
Y + 17 | 3.0 | 98.9 |
Y + 18 | 0.9 | 99.9 |
Y + 19 | 0.1 | 100.0 |
Y + 20 | 0.0 | 100.0 |
CHL = 9 + (50 − 47.6)/(58.4 − 50) = 9.286 | ||