Hi,
I have a data frame that includes people who developed end stage renal disease (ESRD) and those who didn't (controls). I want to match my cases with controls based on age, sex and ethnicity. my sample is 32000. I want to match 5 controls for each case (ratio 1:5). For age I want to match the cases over a range of +/- 5 years (not the exact match), while sex and ethnicity will be exact match (understandably).
Once I match the cases and control i will compare their clinical characteristics with each other to see how different cases are from controls.
I am performing the case control match in R using the package "MatchIt"
m.out=matchit(ESRD~Age+Sex1+Race,method="nearest",data=datamatch,ratio=5)
the above syntax gives me exact matching for age (I think).
Can you please advise me what command to use if I want to match over a range of age?
If there is an easy way of doing it in spss please let me know.
p.s. I am new to R, i mostly use spss.
Many thanks
Saima
Why match at this point in the study. Why not run some regressions with age, sex, and ethnicity as covariates first to see if any of the 3 covariates change anything. If not why match? If they do change something then you know that there is some effect to be found. Best, David
The outcome variable for this study is binary(ESRD or Not).
Logistic regression can be used to define the relationship between the explanatory variables and the outcome variable with Odds Ratio with 95% Confidence intervals and p values.
I would also recommend a logistic regression analysis since you have a large sample (assuming both ESRD and non-ESRD groups are sufficiently large).
i love how no one answered her question....which sucks because I have Lung transplant data from UNOS in SPSS and need to pick matched controls because my cohort is only N=23 (and that's not even a sample, it's the entire population, hence the need for controls). I want to match by age, sex, era of Transplantation (Tx) and indication for Tx. So does someone know how to use SPSS to find matched controls?!
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