analyses:berkey1995
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analyses:berkey1995 [2021/10/06 15:48] – Wolfgang Viechtbauer | analyses:berkey1995 [2022/08/03 11:16] – Wolfgang Viechtbauer | ||
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dat.bcg | dat.bcg | ||
</ | </ | ||
- | The contents of the dataset are: | + | The contents of the dataset are: |
<code output> | <code output> | ||
| | ||
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Model Results: | Model Results: | ||
- | estimate | + | estimate |
- | | + | |
--- | --- | ||
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These results match exactly what Berkey et al. (1995) report on page 408: The amount of heterogeneity (' | These results match exactly what Berkey et al. (1995) report on page 408: The amount of heterogeneity (' | ||
- | ==== Mixed-Effects Model ==== | + | ==== Mixed-Effects |
- | A mixed-effects model with absolute latitude as moderators (centered at 33.46 degrees) can be fitted with: | + | A mixed-effects |
<code rsplus> | <code rsplus> | ||
res.ME <- rma(yi, vi, mods=~I(ablat-33.46), | res.ME <- rma(yi, vi, mods=~I(ablat-33.46), | ||
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Model Results: | Model Results: | ||
- | estimate | + | estimate |
- | intrcpt | + | intrcpt |
- | I(ablat - 33.46) | + | I(ablat - 33.46) |
--- | --- | ||
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<code output> | <code output> | ||
df | df | ||
- | Full 3 29.3011 30.9960 31.9678 -11.6506 | + | Full 3 29.3011 30.9960 31.9678 -11.6506 |
Reduced | Reduced | ||
</ | </ | ||
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</ | </ | ||
- | ==== Fixed-Effects Model ==== | + | ==== Fixed-Effects |
- | The results from a fixed-effects model with absolute latitude as the predictor can be obtained with: | + | The results from a fixed-effects |
<code rsplus> | <code rsplus> | ||
res.FE <- rma(yi, vi, mods=~I(ablat-33.46), | res.FE <- rma(yi, vi, mods=~I(ablat-33.46), | ||
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Model Results: | Model Results: | ||
- | estimate | + | estimate |
- | intrcpt | + | intrcpt |
- | I(ablat - 33.46) | + | I(ablat - 33.46) |
--- | --- | ||
- | Signif. codes: | + | Signif. codes: |
</ | </ | ||
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</ | </ | ||
<code output> | <code output> | ||
- | pred ci.lb ci.ub | + | pred ci.lb ci.ub |
- | 1 0.55 0.48 0.63 | + | 1 0.55 0.48 0.63 |
2 0.43 0.36 0.52 | 2 0.43 0.36 0.52 | ||
</ | </ |
analyses/berkey1995.txt · Last modified: 2022/10/19 18:55 by Wolfgang Viechtbauer