Cem

cem@lists.gking.harvard.edu

152 discussions

by Mukerjee, Zagreb

Hello users of CEM, We are moving the discussion on this mailing list to Github. For discussing CEM, asking questions, or suggesting features, please use our Github discussions: https://github.com/IQSS/cem/discussions. To report any bugs, please fill out this form: https://github.com/IQSS/cem/issues/new. Thank you, Zagreb Mukerjee Research Data Scientist Institute for Quantitative Social Science, Harvard University

3 years

CEM e-mail list moving to GitHub

by Lawrence, Emily

Hi, thanks for your interest in CEM! We are transitioning the CEM email list to GitHub. If you have a bug or feature request, please click https://github.com/IQSS/cem/issues. If you have a general question, comment, or suggestion, click https://github.com/IQSS/cem/discussions Thanks again, Stefano, Gary, and Beppe

3 years, 4 months

CEM for Mediation and Mediated Moderation

by 서연수

Hello! I had some questions in trying to apply CEM to mediation analysis. SEM methods work fine with the CEM weights so that on the surface, mediation seems easy. However, I am not sure that the standard errors are correct. In mediation analyses, it is recommended to do bootstrapping instead of using the output z-values and corresponding p-values as mediated variables often do not follow normal distributions to be highly conservative. I have thought of doing bootstrapping with the weights just on the matched sample but am not if this is the correct approach. For example, https://www.stata.com/statalist/archive/2012-02/msg00822.html suggests that bootstrapping needs to be done more complicatedly in order to correctly incorporate variability. In sum, I would like to get some feedback on how to correctly do mediation (and mediated moderation) analysis using CEM. Even if complete answers are not possible, I would still truly appreciate any kind of related information. Thank you in advance. Best, Yon Soo Suh

3 years, 4 months

Re: [cem] CEM for Mediation and Mediated Moderation

by Gary King

CEM is not designed primarily for mediation analysis, but you can do CEM to reduce model dependence at the first stage and then do whatever type of mediation or other analysis you might do afterwards. best of luck with your research, Gary -- *Gary King* - Albert J. Weatherhead III University Professor - Director, IQSS <http://iq.harvard.edu/> - Harvard University GaryKing.org <http://garyking.org/> - King(a)Harvard.edu - @KingGary <https://twitter.com/kinggary> - 617-500-7570 - Assistant <king-assist(a)iq.harvard.edu>: 617-495-9271 On Thu, Dec 3, 2020 at 3:48 AM 서연수 <yssshinhwa(a)naver.com> wrote: > Hello! > > I had some questions in trying to apply CEM to mediation analysis. > > SEM methods work fine with the CEM weights so that on the surface, > mediation seems easy. However, I am not sure that the standard errors are > correct. In mediation analyses, it is recommended to do bootstrapping > instead of using the output z-values and corresponding p-values as mediated > variables often do not follow normal distributions to be highly > conservative. > > I have thought of doing bootstrapping with the weights just on the matched > sample but am not if this is the correct approach. For example, > > https://www.stata.com/statalist/archive/2012-02/msg00822.html suggests > that bootstrapping needs to be done more complicatedly in order to > correctly incorporate variability. > > In sum, I would like to get some feedback on how to correctly do mediation > (and mediated moderation) analysis using CEM. Even if complete answers are > not possible, I would still truly appreciate any kind of related > information. > > Thank you in advance. > > > > Best, > > > > Yon Soo Suh > > >

3 years, 4 months

CEM back in CRAN?

by Holly Hinson

Hi, I wondered if anyone knew when CEM might return to CRAN for R? Thanks! HH

3 years, 5 months

Re: [cem] CEM back in CRAN?

by Holly Hinson

Sure thing. I suspect the error is mine. Please see entire transcript below: >devtools::install_github("IQSS/cem") Downloading GitHub repo IQSS/cem@HEAD ✓ checking for file ‘/private/var/folders/ls/99kskn5j2rb6s7ghgfydsl50g556b6/T/Rtmp4a1OD6/remotesab2f46a89147/IQSS-cem-de93f7e/DESCRIPTION’ ... ─ preparing ‘cem’: ✓ checking DESCRIPTION meta-information ... ─ checking for LF line-endings in source and make files and shell scripts ─ checking for empty or unneeded directories ─ looking to see if a ‘data/datalist’ file should be added ─ building ‘cem_1.1.27.tar.gz’ Warning: invalid uid value replaced by that for user 'nobody' Warning: invalid gid value replaced by that for user 'nobody' * installing *source* package ‘cem’ ... ** using staged installation ** R ** data ** inst ** byte-compile and prepare package for lazy loading xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun Error: package or namespace load failed for ‘tcltk’: .onLoad failed in loadNamespace() for 'tcltk', details: call: system2("/usr/bin/otool", c("-L", shQuote(DSO)), stdout = TRUE) error: (converted from warning) running command ''/usr/bin/otool' -L '/Library/Frameworks/R.framework/Resources/library/tcltk/libs//tcltk.so'' had status 1 Error: package ‘tcltk’ could not be loaded Execution halted ERROR: lazy loading failed for package ‘cem’ * removing ‘/Library/Frameworks/R.framework/Versions/4.0/Resources/library/cem’ Error: Failed to install 'cem' from GitHub: (converted from warning) installation of package ‘/var/folders/ls/99kskn5j2rb6s7ghgfydsl50g556b6/T//Rtmp4a1OD6/fileab2f64d9f08e/cem_1.1.27.tar.gz’ had non-zero exit status Thank you! HH H. E. Hinson, MD MCR FAAN Associate Director of Clinical Research, Neurocritical Care Program Associate Professor, Neurology and Emergency Medicine Oregon Health & Science University 3181 SW Sam Jackson Park Road, CR-127 Portland, OR 97239 Office/Fax: 503 418-1472 Cell: 503 348-8579 Email: hinson(a)ohsu.edu<mailto:hinson@ohsu.edu> Web: hinsonlab.org From: "Stefano.IACUS(a)ec.europa.eu" <Stefano.IACUS(a)ec.europa.eu> Date: Wednesday, November 4, 2020 at 9:55 AM To: "king(a)harvard.edu" <king(a)harvard.edu>, Holly Hinson <hinson(a)ohsu.edu>, "aaron.wells(a)pophealthcare.com" <aaron.wells(a)pophealthcare.com>, "cem(a)lists.gking.harvard.edu" <cem(a)lists.gking.harvard.edu> Subject: [EXTERNAL] Re: Re: [cem] CEM back in CRAN? Can you please show the full install log as well as the output of session Info () ? What you posted on stackoverflow and what you write do not match, I can only guess that installation fails but you give us more details we can help. Stefano Stefano M. Iacus Project Officer [1571651612864] European Commission Joint Research Centre Demography, Migration and Governance Office: 26B 00/40 Via Enrico Fermi 2749 I-21027 Ispra / Italy Tel +39 0332 78.6088 Fax +39 0332 78.9045 [1571651625394] ________________________________ From: Gary King <thegaryking(a)gmail.com> Sent: 04 November 2020 18:14:03 To: Stefano Iacus; IACUS Stefano (JRC-ISPRA) Subject: Fwd: Re: [cem] CEM back in CRAN? Can you help? Gary -- Gary King - Albert J. Weatherhead III University Professor - Director, IQSS<https://urldefense.com/v3/__http:/iq.harvard.edu/__;!!DOxrgLBm!TLhsICC1yi2z…> - Harvard University GaryKing.org<https://urldefense.com/v3/__http:/garyking.org/__;!!DOxrgLBm!TLhsICC1yi2zRh…> - King(a)Harvard.edu<mailto:King@Harvard.edu> - @KingGary<https://urldefense.com/v3/__https:/twitter.com/kinggary__;!!DOxrgLBm!TLhsIC…> - 617-500-7570 - Assistant<mailto:king-assist@iq.harvard.edu>: 617-495-9271 ---------- Forwarded message --------- From: Holly Hinson <hinson(a)ohsu.edu<mailto:hinson@ohsu.edu>> Date: Wed, Nov 4, 2020 at 12:11 PM Subject: Re: Re: [cem] CEM back in CRAN? To: King, Gary <king(a)harvard.edu<mailto:king@harvard.edu>> Hi Gary, Thank you—I had tried that prior to posting, and was getting an error message that I posted to Stack Overflow: https://stackoverflow.com/questions/64672623/coarsened-exact-matching-cem-i…<https://urldefense.com/v3/__https:/stackoverflow.com/questions/64672623/coa…> It seems like the package “tcltk” isn’t behaving as expected? “Error: package ‘tcltk’ could not be loaded Execution halted” Sorry to both you with this! I really appreciate the help! HH H. E. Hinson, MD MCR FAAN Associate Director of Clinical Research, Neurocritical Care Program Associate Professor, Neurology and Emergency Medicine Oregon Health & Science University 3181 SW Sam Jackson Park Road, CR-127 Portland, OR 97239 Office/Fax: 503 418-1472 Cell: 503 348-8579 Email: hinson(a)ohsu.edu<mailto:hinson@ohsu.edu> Web: hinsonlab.org<https://urldefense.com/v3/__http:/hinsonlab.org__;!!DOxrgLBm!TLhsICC1yi2zRh…> From: Gary King <thegaryking(a)gmail.com<mailto:thegaryking@gmail.com>> Reply-To: "king(a)harvard.edu<mailto:king@harvard.edu>" <king(a)harvard.edu<mailto:king@harvard.edu>> Date: Wednesday, November 4, 2020 at 9:00 AM To: Aaron Wells <aaron.wells(a)pophealthcare.com<mailto:aaron.wells@pophealthcare.com>> Cc: Holly Hinson <hinson(a)ohsu.edu<mailto:hinson@ohsu.edu>>, "cem(a)lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu>" <cem(a)lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu>> Subject: [EXTERNAL] Re: [cem] CEM back in CRAN? Sorry about that! R changes over time and you have to keep up! We've made the necessary changes and they're just verifying (all are really tiny changes). But if you want to install the new version, you can still do it, straight from our github repository. I put info about how to do this at GaryKing.org/CEM Thanks for your patience! Gary -- Gary King - Albert J. Weatherhead III University Professor - Director, IQSS<https://urldefense.com/v3/__http:/iq.harvard.edu/__;!!DOxrgLBm!TLhsICC1yi2z…> - Harvard University GaryKing.org<https://urldefense.com/v3/__http:/garyking.org/__;!!DOxrgLBm!TLhsICC1yi2zRh…> - King(a)Harvard.edu<mailto:King@Harvard.edu> - @KingGary<https://urldefense.com/v3/__https:/twitter.com/kinggary__;!!DOxrgLBm!TLhsIC…> - 617-500-7570 - Assistant<mailto:king-assist@iq.harvard.edu>: 617-495-9271 On Wed, Nov 4, 2020 at 11:54 AM Aaron Wells <aaron.wells(a)pophealthcare.com<mailto:aaron.wells@pophealthcare.com>> wrote: Thank you Holly for asking this question. What transpired such that the package was removed? And, to your question, when will the package return? Thank you. Aaron From: cem-bounces(a)lists.gking.harvard.edu<mailto:cem-bounces@lists.gking.harvard.edu> <cem-bounces(a)lists.gking.harvard.edu<mailto:cem-bounces@lists.gking.harvard.edu>> On Behalf Of Holly Hinson Sent: Wednesday, November 4, 2020 10:30 AM To: cem(a)lists.gking.harvard.edu<mailto:cem@lists.gking.harvard.edu> Subject: [cem] CEM back in CRAN? WARNING: this email originated from outside of the organization. Please use CAUTION before clicking on links, opening attachments, or providing any information. Hi, I wondered if anyone knew when CEM might return to CRAN for R? Thanks! HH IMPORTANT NOTICE: This e-mail message is intended to be received only by persons entitled to receive the confidential information it may contain. E-mail messages to clients of PopHealthCare may contain information that is confidential and legally privileged. Please do not read, copy, forward, or store this message unless you are an intended recipient of it. If you have received this message in error, please forward it to the sender and delete it completely from your computer system.

3 years, 5 months

Re: [cem] CEM back in CRAN?

by Gary King

Sorry about that! R changes over time and you have to keep up! We've made the necessary changes and they're just verifying (all are really tiny changes). But if you want to install the new version, you can still do it, straight from our github repository. I put info about how to do this at GaryKing.org/CEM Thanks for your patience! Gary -- *Gary King* - Albert J. Weatherhead III University Professor - Director, IQSS <http://iq.harvard.edu/> - Harvard University GaryKing.org <http://garyking.org/> - King(a)Harvard.edu - @KingGary <https://twitter.com/kinggary> - 617-500-7570 - Assistant <king-assist(a)iq.harvard.edu>: 617-495-9271 On Wed, Nov 4, 2020 at 11:54 AM Aaron Wells <aaron.wells(a)pophealthcare.com> wrote: > Thank you Holly for asking this question. What transpired such that the > package was removed? And, to your question, when will the package return? > > > > Thank you. > > > > Aaron > > > > *From:* cem-bounces(a)lists.gking.harvard.edu < > cem-bounces(a)lists.gking.harvard.edu> *On Behalf Of *Holly Hinson > *Sent:* Wednesday, November 4, 2020 10:30 AM > *To:* cem(a)lists.gking.harvard.edu > *Subject:* [cem] CEM back in CRAN? > > > > *WARNING:* this email originated from outside of the organization. Please > use *CAUTION* before clicking on links, opening attachments, or providing > any information. > > Hi, > > I wondered if anyone knew when CEM might return to CRAN for R? > > Thanks! > > HH > IMPORTANT NOTICE: This e-mail message is intended to be received only by > persons entitled to receive the confidential information it may contain. > E-mail messages to clients of PopHealthCare may contain information that is > confidential and legally privileged. Please do not read, copy, forward, or > store this message unless you are an intended recipient of it. If you have > received this message in error, please forward it to the sender and delete > it completely from your computer system. >

3 years, 5 months

CEM: Stata vs R

by Blom, drs. M. - WODC/CRS

Hi All, I can't get why the analyzes below, performed in Stata / R, do not produce the same result. Please provide your suggestions for the explanation for these differences. Thanks, Martine PS (how) can I display the actual cutpoints in Stata (imb)? -- STATA . import delimited "G:\Recidive\Projecten\Verkeer\Algemeen\Artikel effectiviteit ASP tijdens\Data\Data voor R.csv", clear (8 vars, 8,627 obs) . imb d_sekse lftbegrec d_addinfo_ind_best lftinsz1 vgalgexuz vgverkexuz vgrijoiuz, treatment (treat) (using the scott break method for L1 distance) Multivariate L1 distance: .68243298 Univariate imbalance: L1 mean min 25% 50% 75% max d_sekse .01557 -.01557 0 0 0 0 0 lftbegrec .0687 -1.5626 0 -1 -2 -1 -5 d_addinfo_ind_best .00497 -.00497 0 0 0 0 0 lftinsz1 .08852 .91045 0 1 1 2 -12 vgalgexuz .14912 -1.2611 0 0 -1 -1 78 vgverkexuz .09852 -.41727 0 0 0 -1 4 vgrijoiuz .11859 -.36406 0 0 0 0 -4 --R > data <- read.csv(file = "G:\\Recidive\\Projecten\\Verkeer\\Algemeen\\Artikel effectiviteit ASP tijdens\\Data\\Data voor R.csv") > cov <- c("D_SEKSE", "LFTBEGREC", "D_ADDINFO_IND_BEST","LFTINSZ1", "VGALGEXUZ", "VGVERKEXUZ", "VGRIJOIUZ") > imb <- imbalance(group = data$TREAT, data = data[cov]) > imb Multivariate Imbalance Measure: L1=0.665 Percentage of local common support: LCS=11.2% Univariate Imbalance Measures: statistic type L1 min 25% 50% 75% max D_SEKSE -0.015571508 (diff) 0.015571508 0 0 0 0 0 LFTBEGREC -1.562561051 (diff) 0.025019213 0 -1 -2 -1 -5 D_ADDINFO_IND_BEST -0.004970458 (diff) 0.004970458 0 0 0 0 0 LFTINSZ1 0.910454843 (diff) 0.045867098 0 1 1 2 -12 VGALGEXUZ -1.261056065 (diff) 0.146272471 0 0 -1 -1 78 VGVERKEXUZ -0.417271627 (diff) 0.097957912 0 0 0 -1 4 VGRIJOIUZ -0.364063976 (diff) 0.118028583 0 0 0 0 -4 ________________________________ Dit bericht kan informatie bevatten die niet voor u is bestemd. Indien u niet de geadresseerde bent of dit bericht abusievelijk aan u is toegezonden, wordt u verzocht dat aan de afzender te melden en het bericht te verwijderen. De Staat aanvaardt geen aansprakelijkheid voor schade, van welke aard ook, die verband houdt met risico's verbonden aan het elektronisch verzenden van berichten. Ministerie van Justitie en Veiligheid This message may contain information that is not intended for you. If you are not the addressee or if this message was sent to you by mistake, you are requested to inform the sender and delete the message. The State accepts no liability for damage of any kind resulting from the risks inherent in the electronic transmission of messages. Ministry of Justice and Security

3 years, 9 months

Re: [cem] Cem Digest, Vol 128, Issue 1

by Oladele Campbell

Dear Victoria I have used CEM in my PhD research to realise 1:1 matched samples as shown in the attached document. So, it is possible. However, I did not use the R package but rather the SPSS add-on. I downloaded the software and the manual for installing the add-on online. I searched for the SPSS software extension bundle on my system, and i am sending a copy. But unfortunately, I could not find the manual. But if you are interested in using it, you can find it online. Best wishes Oladele Campbell On Thu, Jul 9, 2020 at 5:00 PM <cem-request(a)lists.gking.harvard.edu> wrote: > Send Cem mailing list submissions to > cem(a)lists.gking.harvard.edu > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.gking.harvard.edu/mailman/listinfo/cem > or, via email, send a message with subject or body 'help' to > cem-request(a)lists.gking.harvard.edu > > You can reach the person managing the list at > cem-owner(a)lists.gking.harvard.edu > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of Cem digest..." > > > Today's Topics: > > 1. How to get matched pairs from CEM? (Victoria Graham) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 9 Jul 2020 03:10:09 +0000 > From: Victoria Graham <victoria.graham(a)mq.edu.au> > To: "cem(a)lists.gking.harvard.edu" <cem(a)lists.gking.harvard.edu> > Subject: [cem] How to get matched pairs from CEM? > Message-ID: > < > SY2PR01MB241067CD2E5D13825698283AA5640(a)SY2PR01MB2410.ausprd01.prod.outlook.com > > > > Content-Type: text/plain; charset="utf-8" > > Hi, > > I am using Coursened Exact Matching to improve balance in my sample. The > summary matching results after applying CEM are that 11,128 pixels have > been matched: > > Sample sizes: > > Control Treated > > All 19741 8283 > > Matched 6728 4400 > > Unmatched 13013 3883 > > Discarded 0 0 > > Firstly, is it possible to specify 1:1 matching with CEM? I want to only > retain matched pairs, which requires the same amount of pixels in my > treatment & control groups. > > I am also having trouble getting a unique identifier for each matched pair > so that I can calculate the difference between the treatment and control. I > am using the code: > > pair: Produces a paired sample out of a CEM match solution > > When I execute the below command, it says there are 0 matches. > > > # we want a set of paired units > > > pairsample <- pair(match.out_cem, data) > > > > Total number of units paired in CEM strata: 0 > > Total number of units matched: 0 > > Can anyone help or point me in the right direction? > > Thanks, Tori > > Victoria Graham | MPhil., PhD candidate > Macquarie University NSW 2109 Australia > T: +61 2 9850 6298 | E: victoria.graham(a)mq.edu.au<mailto: > victoria.graham(a)mq.edu.au> > Twitter:@ToriFGraham<https://twitter.com/ToriFGraham> > > [cid:image001.png@01D5F150.30032D90] > >

3 years, 9 months

How to get matched pairs from CEM?

by Victoria Graham

Hi, I am using Coursened Exact Matching to improve balance in my sample. The summary matching results after applying CEM are that 11,128 pixels have been matched: Sample sizes: Control Treated All 19741 8283 Matched 6728 4400 Unmatched 13013 3883 Discarded 0 0 Firstly, is it possible to specify 1:1 matching with CEM? I want to only retain matched pairs, which requires the same amount of pixels in my treatment & control groups. I am also having trouble getting a unique identifier for each matched pair so that I can calculate the difference between the treatment and control. I am using the code: pair: Produces a paired sample out of a CEM match solution When I execute the below command, it says there are 0 matches. > # we want a set of paired units > pairsample <- pair(match.out_cem, data) Total number of units paired in CEM strata: 0 Total number of units matched: 0 Can anyone help or point me in the right direction? Thanks, Tori Victoria Graham | MPhil., PhD candidate Macquarie University NSW 2109 Australia T: +61 2 9850 6298 | E: victoria.graham(a)mq.edu.au<mailto:victoria.graham@mq.edu.au> Twitter:@ToriFGraham<https://twitter.com/ToriFGraham> [cid:image001.png@01D5F150.30032D90]

3 years, 9 months

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