Matchit July 2006

matchit@lists.gking.harvard.edu

3 participants
3 discussions

RE: [matchit] Problem w/ Summary in MatchIt; Calls to "stop" in matchit.R

by Elizabeth Stuart

Dear Daniel, We have just uploaded a new version (2.2-11) of MatchIt to CRAN which should automatically convert variables to factors in the summary() and plot() commands and thus fix this problem. It should be available on CRAN within about 24 hours. Please let us know if you continue to have problems with this. To answer your other question, the call.=FALSE argument simply tells stop() not to print out the actual command that led to the error. See help(stop) for more information. I hope this is helpful. Sincerely, Liz Stuart -----Original Message----- From: owner-matchit_at_lists_gking_harvard_edu(a)mail.hmdc.harvard.edu [mailto:owner-matchit_at_lists_gking_harvard_edu@mail.hmdc.harvard.edu]O n Behalf Of Daniel Gerlanc Sent: Monday, July 10, 2006 3:48 PM To: matchit(a)lists.gking.harvard.edu Subject: Re: [matchit] Problem w/ Summary in MatchIt; Calls to "stop" in matchit.R Thanks! Converting the columns to factors causes the function to evaluate without errors. In this case, the MatchIt code should convert character vectors to factors and possibly tell the user this (or "stop" and tell the user to coerce the character vector to factor) - Avoid run-time errors! Another question. In the "matchit" function located in "matchit.R", calls to "stop" include a "call" argument: stop("Dataframe must be specified",call.=FALSE) What is the purpose of the "call.=FALSE" argument? Best, Daniel Gerlanc Williams College On 7/8/06, Kosuke Imai <kimai(a)princeton.edu> wrote: > Hi, > Perhaps, you can convert a character variable into a factor variable > using as.factor(). > Hope this helps, > Kosuke > > ----------------------------------------------------- > Kosuke Imai Office: Corwin Hall 041 > Assistant Professor Phone: 609-258-6601 > Department of Politics eFax: 973-556-1929 > Princeton University Email: kimai(a)Princeton.Edu > Princeton, NJ 08544-1012 http://imai.princeton.edu > ----------------------------------------------------- > > On Wed, 5 Jul 2006, Daniel Gerlanc wrote: > > > I am running R 2.3.1 on Linux and using MatchIt version 2.2-10. I'm > > having a problem similar to the one documented by David Kane on April > > 18th (See http://lists.hmdc.harvard.edu/lists/matchit/2006_04/msg00004.html). > > > > It seems that when I include a column of class "character" in the data > > frame that I pass as an argument to "data", the "summary" method > > returns the following error: > > > > Error in x * w : non-numeric argument to binary operator > > In addition: Warning messages: > > 1: argument is not numeric or logical: returning NA in: > > mean.default(x1, na.rm = T) > > 2: argument is not numeric or logical: returning NA in: > > mean.default(x0, na.rm = T) > > > > I replicated the error using the toy example that Dave Kane provided: > > > > > set.seed(1) > > > x <- data.frame(treated = ifelse(rnorm(100) < -1, 1, 0), b = rnorm(100), c = ifelse(rnorm(100) < 0, "green", "blue")) > > > summary(x) > > treated b c > > Min. :0.00 Min. :-1.9144 blue :50 > > 1st Qu.:0.00 1st Qu.:-0.6510 green:50 > > Median :0.00 Median :-0.1772 > > Mean :0.11 Mean :-0.0378 > > 3rd Qu.:0.00 3rd Qu.: 0.5009 > > Max. :1.00 Max. : 2.3080 > > > mt <- matchit(treated ~ b, data = x, exact = "c") > > > summary(mt) > > Error in x * w : non-numeric argument to binary operator > > In addition: Warning messages: > > 1: argument is not numeric or logical: returning NA in: > > mean.default(x1, na.rm = T) > > 2: argument is not numeric or logical: returning NA in: > > mean.default(x0, na.rm = T) > > > > Subsequently, I set the "c" column of "x" to all 0s, called "matchit" > > again, then called called summary. There were no errors under this > > configuration. As I mentioned earlier, the problem most likely has to > > do with the multiplication of character data. I would lke to use > > "character" values as pre-treatment variables so a solution to this > > problem would be greatly appreciated! > > > > Thank you! > > > > Daniel Gerlanc > > > > - > > MatchIt mailing list served by Harvard-MIT Data Center > > List Address: matchit(a)lists.gking.harvard.edu > > Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit > > MatchIt Software and Documentation: http://gking.harvard.edu/matchit/ > > > > -- Daniel Gerlanc (201) 213-0927 - MatchIt mailing list served by Harvard-MIT Data Center List Address: matchit(a)lists.gking.harvard.edu Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit MatchIt Software and Documentation: http://gking.harvard.edu/matchit/ - MatchIt mailing list served by Harvard-MIT Data Center List Address: matchit(a)lists.gking.harvard.edu Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit MatchIt Software and Documentation: http://gking.harvard.edu/matchit/

17 years, 9 months

Re: [matchit] Problem w/ Summary in MatchIt; Calls to "stop" in matchit.R

by Daniel Gerlanc

Thanks! Converting the columns to factors causes the function to evaluate without errors. In this case, the MatchIt code should convert character vectors to factors and possibly tell the user this (or "stop" and tell the user to coerce the character vector to factor) - Avoid run-time errors! Another question. In the "matchit" function located in "matchit.R", calls to "stop" include a "call" argument: stop("Dataframe must be specified",call.=FALSE) What is the purpose of the "call.=FALSE" argument? Best, Daniel Gerlanc Williams College On 7/8/06, Kosuke Imai <kimai(a)princeton.edu> wrote: > Hi, > Perhaps, you can convert a character variable into a factor variable > using as.factor(). > Hope this helps, > Kosuke > > ----------------------------------------------------- > Kosuke Imai Office: Corwin Hall 041 > Assistant Professor Phone: 609-258-6601 > Department of Politics eFax: 973-556-1929 > Princeton University Email: kimai(a)Princeton.Edu > Princeton, NJ 08544-1012 http://imai.princeton.edu > ----------------------------------------------------- > > On Wed, 5 Jul 2006, Daniel Gerlanc wrote: > > > I am running R 2.3.1 on Linux and using MatchIt version 2.2-10. I'm > > having a problem similar to the one documented by David Kane on April > > 18th (See http://lists.hmdc.harvard.edu/lists/matchit/2006_04/msg00004.html). > > > > It seems that when I include a column of class "character" in the data > > frame that I pass as an argument to "data", the "summary" method > > returns the following error: > > > > Error in x * w : non-numeric argument to binary operator > > In addition: Warning messages: > > 1: argument is not numeric or logical: returning NA in: > > mean.default(x1, na.rm = T) > > 2: argument is not numeric or logical: returning NA in: > > mean.default(x0, na.rm = T) > > > > I replicated the error using the toy example that Dave Kane provided: > > > > > set.seed(1) > > > x <- data.frame(treated = ifelse(rnorm(100) < -1, 1, 0), b = rnorm(100), c = ifelse(rnorm(100) < 0, "green", "blue")) > > > summary(x) > > treated b c > > Min. :0.00 Min. :-1.9144 blue :50 > > 1st Qu.:0.00 1st Qu.:-0.6510 green:50 > > Median :0.00 Median :-0.1772 > > Mean :0.11 Mean :-0.0378 > > 3rd Qu.:0.00 3rd Qu.: 0.5009 > > Max. :1.00 Max. : 2.3080 > > > mt <- matchit(treated ~ b, data = x, exact = "c") > > > summary(mt) > > Error in x * w : non-numeric argument to binary operator > > In addition: Warning messages: > > 1: argument is not numeric or logical: returning NA in: > > mean.default(x1, na.rm = T) > > 2: argument is not numeric or logical: returning NA in: > > mean.default(x0, na.rm = T) > > > > Subsequently, I set the "c" column of "x" to all 0s, called "matchit" > > again, then called called summary. There were no errors under this > > configuration. As I mentioned earlier, the problem most likely has to > > do with the multiplication of character data. I would lke to use > > "character" values as pre-treatment variables so a solution to this > > problem would be greatly appreciated! > > > > Thank you! > > > > Daniel Gerlanc > > > > - > > MatchIt mailing list served by Harvard-MIT Data Center > > List Address: matchit(a)lists.gking.harvard.edu > > Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit > > MatchIt Software and Documentation: http://gking.harvard.edu/matchit/ > > > > -- Daniel Gerlanc (201) 213-0927 - MatchIt mailing list served by Harvard-MIT Data Center List Address: matchit(a)lists.gking.harvard.edu Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit MatchIt Software and Documentation: http://gking.harvard.edu/matchit/

17 years, 9 months

Problem w/ Summary in MatchIt

by Daniel Gerlanc

I am running R 2.3.1 on Linux and using MatchIt version 2.2-10. I'm having a problem similar to the one documented by David Kane on April 18th (See http://lists.hmdc.harvard.edu/lists/matchit/2006_04/msg00004.html). It seems that when I include a column of class "character" in the data frame that I pass as an argument to "data", the "summary" method returns the following error: Error in x * w : non-numeric argument to binary operator In addition: Warning messages: 1: argument is not numeric or logical: returning NA in: mean.default(x1, na.rm = T) 2: argument is not numeric or logical: returning NA in: mean.default(x0, na.rm = T) I replicated the error using the toy example that Dave Kane provided: > set.seed(1) > x <- data.frame(treated = ifelse(rnorm(100) < -1, 1, 0), b = rnorm(100), c = ifelse(rnorm(100) < 0, "green", "blue")) > summary(x) treated b c Min. :0.00 Min. :-1.9144 blue :50 1st Qu.:0.00 1st Qu.:-0.6510 green:50 Median :0.00 Median :-0.1772 Mean :0.11 Mean :-0.0378 3rd Qu.:0.00 3rd Qu.: 0.5009 Max. :1.00 Max. : 2.3080 > mt <- matchit(treated ~ b, data = x, exact = "c") > summary(mt) Error in x * w : non-numeric argument to binary operator In addition: Warning messages: 1: argument is not numeric or logical: returning NA in: mean.default(x1, na.rm = T) 2: argument is not numeric or logical: returning NA in: mean.default(x0, na.rm = T) Subsequently, I set the "c" column of "x" to all 0s, called "matchit" again, then called called summary. There were no errors under this configuration. As I mentioned earlier, the problem most likely has to do with the multiplication of character data. I would lke to use "character" values as pre-treatment variables so a solution to this problem would be greatly appreciated! Thank you! Daniel Gerlanc - MatchIt mailing list served by Harvard-MIT Data Center List Address: matchit(a)lists.gking.harvard.edu Subscribe/Unsubscribe: http://lists.gking.harvard.edu/?info=matchit MatchIt Software and Documentation: http://gking.harvard.edu/matchit/

17 years, 9 months

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Matchit July 2006