Results of pre- and post-1992 comparison of predicted usage
| Model 1: East Asia | Model 2: Europe | Model 3: North America | Model 4: Other | |||||
|---|---|---|---|---|---|---|---|---|
| Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | |
| Topic from same region | 7.00 | 3.00 | 6.14 | 2.61 | 15.45 | 5.68 | 0.19 | 1.58 |
| Topic from elsewhere | 1.51 | 1.71 | 3.68 | 3.75 | 11.14 | 4.18 | 1.75 | 1.69 |
| Difference χ2[1] (p) | 81.60 (0.000) | 5.29 (0.021) | 8.01 (0.005) | 6.61 (0.010) | 31.84 (0.000) | 5.33 (0.021) | 77.15 (0.000) | 0.38 (0.536) |
| Ratio | 4.64 | 1.75 | 1.67 | 0.70 | 1.39 | 1.36 | 0.11 | 0.93 |
| Wald z (p) | 4.09 (0.000) | 3.48 (0.001) | 0.13 (0.898) | −6.31 (0.000) | ||||
| Model 1: East Asia | Model 2: Europe | Model 3: North America | Model 4: Other | |||||
|---|---|---|---|---|---|---|---|---|
| Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | Pre-1992 | Post-1992 | |
| Topic from same region | 7.00 | 3.00 | 6.14 | 2.61 | 15.45 | 5.68 | 0.19 | 1.58 |
| Topic from elsewhere | 1.51 | 1.71 | 3.68 | 3.75 | 11.14 | 4.18 | 1.75 | 1.69 |
| Difference | 81.60 (0.000) | 5.29 (0.021) | 8.01 (0.005) | 6.61 (0.010) | 31.84 (0.000) | 5.33 (0.021) | 77.15 (0.000) | 0.38 (0.536) |
| Ratio | 4.64 | 1.75 | 1.67 | 0.70 | 1.39 | 1.36 | 0.11 | 0.93 |
| Wald | 4.09 (0.000) | 3.48 (0.001) | 0.13 (0.898) | −6.31 (0.000) | ||||
Notes: Wald z tests whether or not the pre- and post-1992 ratios are significantly different from one another. We focus on comparison of ratios rather than comparisons of absolute differences, as pre-1992 articles have had more time to accumulate topic usage. The more meaningful comparison lies in differences in the relative usage, rather than absolute differences, between time periods
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