Abstract
If the outcome variable is continuous and interest is to compare the effects of two interventions (e.g. treatment and control), standardized mean difference may be the appropriate effects size measure.
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Appendix 8—Stata Codes for Meta-Analysis of SMD
Appendix 8—Stata Codes for Meta-Analysis of SMD
A8.1 Open Education dataset
Study | d | se |
|---|---|---|
Study 1 | 0.563 | 0.307426 |
Study 2 | 0.308 | 0.449858 |
Study 3 | 0.081 | 0.447397 |
Study 4 | 0.598 | 0.4571 |
Study 5 | −0.178 | 0.226903 |
Study 6 | −0.234 | 0.200684 |
A8.2 Stat codes for SMD meta-analysis under different statistical models
. ssc install admetan
Codes for SMD meta-analysis under FE, RRs and Ivhet models
. admetan d se, iv
. admetan d se, re
. admetan d se, ivhet
A8.3 Operative Time dataset
study | n_larr | mean_larr | sd_larr | n_orr | mean_orr | sd_orr |
|---|---|---|---|---|---|---|
Bonjer et al. (2015) | 699 | 241 | 33.6 | 345 | 191.5 | 26.2 |
Fleshman et al. (2015) | 240 | 266.2 | 101.9 | 222 | 220.6 | 92.4 |
Stevenson et al. (2015) | 238 | 210 | 66.7 | 235 | 190 | 59.2 |
Jeong et al. (2014) | 170 | 244.9 | 75.4 | 170 | 197 | 62.9 |
Ng et al. (2014) | 40 | 211.6 | 53 | 40 | 153 | 41.1 |
Liang et al. (2011) | 169 | 138.08 | 23.79 | 174 | 118.53 | 21.99 |
Lujan et al. (2009) | 101 | 193.7 | 45.1 | 103 | 172.9 | 59.4 |
Ng et al. (2008) | 51 | 213.5 | 46.2 | 48 | 163.7 | 43.4 |
Zhou et al. (2004) | 82 | 120 | 18 | 89 | 106 | 25 |
A8.4 Stata codes for SMD meta-analysis of Operation Time dataset
. ssc install admetan
Codes for SMD meta-analysis of FE model for different effect sizes
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, cohen
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, hedges
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, glass
Codes for SMD meta-analysis of REs model for different effect sizes
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, cohen re
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, hedges re
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, glass re
Codes for SMD meta-analysis of IVhet model for different effect sizes
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, cohen ivhet
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, hedges ivhet
. admetan n_larr mean_larr sd_larr n_orr mean_orr sd_orr, glass ivhet
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Khan, S. (2020). Meta-Analysis of Standardized Mean Difference. In: Meta-Analysis. Statistics for Biology and Health. Springer, Singapore. https://doi.org/10.1007/978-981-15-5032-4_8
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