0941, which is below the commonly accepted threshold of 0.1 and thus considered to be balanced. Variable with the greatest mean differenceĬhronic_pulmonary_disease_Yes -0.1569 Not Balanced, >0.1Īs is seen above, the SMD of malignancy after matching as calculated by the cobalt package is. Myocardial_infarction_Yes Binary 0.1561 -0.0683 Balanced, 0.1 Matchit(formula = formula, data = working_data, method = "nearest",ĭistance = "glm", replace = FALSE, caliper = 0.3, ratio = 4)ĭistance Distance 0.6876 0.0271 Balanced, 0.1
> matched_data = match.data(matched_data) > matched_data = matchit(formula, data = working_data, distance = "glm", method = "nearest", replace = FALSE, ratio = 4, caliper = 0.3) Here it is AFTER performing matching using the MatchIt package and assessing balance again with CreateTableOne: > formula = treated~ age_at_diagnosis + charlson_score + median_wbc_6mo + chemotherapy + radiation + smoking + alcohol + myocardial_infarction + congestive_heart_failure + peripheral_vascular_disease + cerebrovascular_disease + dementia + chronic_pulmonary_disease + rheumatic_disease + mild_liver_disease + diabetes_without_complication + diabetes_with_complication + hemiplegia_or_paraplegia + renal_disease + malignancy + metastatic_cancer + hiv_or_aids Here is the data BEFORE performing any matching using CreateTableOne: > print(CreateTableOne(vars = variables_for_table, strata = "treated", data = working_data), quote = FALSE, noSpaces = TRUE, smd = TRUE)Īge_at_diagnosis (mean (SD)) 64.37 (10.63) 62.40 (14.87) 0.316 0.153Ĭharlson_score (mean (SD)) 1.93 (2.19) 3.10 (3.81) 0.008 0.374 I tried two approaches to assess balance using both the CreateTableOne package as well as the cobalt package in R however I was getting differing results and wanted to ask the community if anyone had any suggestions on what may be causing the discrepancy. I was attempting to calculate standardized mean differences (SMDs) after performing propensity score matching to verify that balance was achieved, however was running into some discrepancies between packages.
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