propensity-score matched analysispropensity-score matched analysis 倾向性评分匹配(propensity score matching,PSM)是一种统计学方法,旨在减少研究中的偏差和混杂变量影响,以便对观察组和对照组进行更合理的比较。这种方法最早由Paul Rosenbaum和Donald Rubin在1983年提出,此后获得了快速发展并且在各个方面不断改进。 倾向...
In the matched cohort, major complication rates of donors were similar in both groups. Bile duct (BD) variation was not significantly different; however, the rates of multiple BD openings (26.8% versus 54.9%; P = 0.001) and major biliary complications in recipients were higher in the LDRH ...
Once the propensity score is estimated, eˆ(x), then units are ideally matched to each other so that treated units with a particular value of eˆ(x) are matched to control units with the same value of the propensity score. It is most common to do pair matching (one treated unit ma...
Of 785 patients with under-recognition of AKI and 616 patients with timely-recognition of AKI were propensity matched in a 1:1 ratio. The two groups, with a total of 482 matched patients (241:241), were comparable in baseline covariates. Under-recognition of AKI was not associated with 30...
当选择matched的控制组集合时,需要考虑: variables to be used for matching: covariates or propensity score distances the number of controls: pair-matching or multiple matching caliper: a chosen threshold of matching stratification: 即两阶段的matching greedy:a control is matched to only one treated at...
matched.by = "pscore", setseed = 12345) #利用ps.match函数进行倾向评分匹配,who.treated =1,表示1代表处理组,ratio确定匹配比例,x代表得分容差,givenTmatchingC = T表示用未处理记录去匹配处理组记录。 输入:summary(mydata.match) 结果:...
propensity score-matched cohorts 词典结果 propensity score-matched cohorts 倾向得分匹配的同伙
matched sample. Since HSR lines are opened each year, the matching of city pairs is conducted by year using lagged control variables. The balancing property of the propensity score is tested and satisfied, and we show the results of the balance test inTable A2. After obtaining a matched ...
Propensity score is a balancing score. This means, if we match records based on the propensity score, the distribution of the confounders between matched records will likely be similar. In the following script, we find a control record with the most similar propensity score for each example in...
and each patient was matched 1:1 based on their preoperative medication score and disease type; the caliper coefficient was set to 0.2. We performed surgery on patients whose progression was not controlled with medication alone and whose cataracts were observed concurrently. These patients were indica...