Matchit August 2013

matchit@lists.gking.harvard.edu

11 participants
6 discussions

by Tingting Liu

Dear users, I am wondering whether Matchit allows for multiple treatments in the latest version? Or I have to code it by myself. Thanks, Tingting -- Tingting Liu Department of Environment and Natural Resources Economics University of Rhode Island

10 years, 8 months

Multiple imputation and matchit

by Andrea Lamont

Hello: I am interested in using MatchIt with an imputed dataset (m=10). I have read previous questions on this listserv related to imputations and matchit, and see that I should run the matching on each imputation. The problem I am facing, however, is that there is missingess on the matching variable itself, which may result in different matches per imputation. Do you have any suggestions on how to deal with this restriction? I was thinking of using a randomizer to "hard assign" membership into case/control (the matching variable) with the probabilty of being selected as a case equal to the number of imputations in which case was imputed. Does that sound plausible, or is there a way to handle this non-deterministic problem in MatchIt? Andrea -- Andrea Lamont, MA Clinical-Community Psychology University of South Carolina Barnwell College Columbia, SC 29208 Please consider the environment before printing this email. CONFIDENTIAL: This transmission is intended for the use of the individual(s) or entity to which it is addressed, and may contain information that is privileged, confidential, and exempt from disclosure under applicable law. Should the reader of this message not be the intended recipient(s), you are hereby notified that any dissemination, distribution, or copying of this communication is strictly prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy/delete all copies of the original message.

10 years, 8 months

Matchit for multiple treatments

by Tingting Liu

10 years, 8 months

Warning message in demo from the manual for optimal matching

by Ajay Shah

> library(MatchIt) Loading required package: MASS > m.out <- matchit(treat ~ re74 + re75 + age + educ, data = lalonde, + method = "optimal", ratio = 2) Warning message: In fullmatch(d, min.controls = ratio, max.controls = ratio, omit.fraction = (n0 - : Without 'data' argument the order of the match is not guaranteed to be the same as your original data. Is there a problem here? -- Ajay Shah ajayshah(a)mayin.org http://www.mayin.org/ajayshah http://ajayshahblog.blogspot.com

10 years, 8 months

Confusing message when using own distance measure for matching

by Sharon Simonton

Hi All, Thank you so much for all of your helpful advice! I've imported a distance measure into MatchIt and when I try to use it for matching I receive the following message: Warning message: In if (distance %in% c("GAMlogit", "GAMprobit", "GAMcloglog", "GAMlog", : the condition has length > 1 and only the first element will be used It looks as though MatchIt thinks I'm trying to use generalized additive models to estimate the distance measure. However, when I list the variables in my data set, MatchIt lists the propensity score that I read in as the "distance". Data set also includes a variable called "weights" that's equal to one for all observations. My imported distance measure ranges from 0.007 to 0.9479. I'd appreciate any advice you may have on what this message means and how to address it so that I can match. Thanks again for your help. Best wishes, Sharon Simonton

10 years, 8 months

Using an Existing Propensity Score in MatchIt

by Higgins,George Edward

Hello, I hope that this finds you well. I have a data set where I have estimated the propensity score previously, and now I need MatchIt to read that propensity score and perform the matching process. With this in mind, I was wondering if there was syntax or code that could be used to have MatchIt use this existing propensity score? Thank you. George George E. Higgins, Ph.D. Professor Editor of Journal of Criminal Justice Education 2301 South Third Street 208 Brigman Hall Department of Justice Administration University of Louisville Louisville, KY 40292 Phone: (502) 852-0331 Fax: (502) 852-0065

10 years, 9 months

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Matchit August 2013