Hi, Stefano, Thanks for your response. I updated cem (stata) and now it works well. It must be bcause my previous cem is old version. Best Sun ________________________________ From: owner-cem_at_lists_gking_harvard_edu(a)mail.hmdc.harvard.edu [owner-cem_at_lists_gking_harvard_edu(a)mail.hmdc.harvard.edu] On Behalf Of stefano iacus [stefano.iacus(a)unimi.it] Sent: Friday, 1 April 2011 4:11 PM To: Sun, Sizhong Cc: cem(a)lists.gking.harvard.edu Subject: Re: [cem] imbalance after cem Hi Sun, can you tell which version of cem you are using? further Stata or R ? stefano Inviato da iPhone Il giorno 01/apr/2011, alle ore 07:46, "Sun, Sizhong" <sizhong.sun@jcu.edu.au<mailto:sizhong.sun@jcu.edu.au>> ha scritto: Hi, cemers, I am currently using cem to examine whether domestic firms being geographically close to foreign firms affects their exports (the geogrpahical proximity is the treatment). After cem (over a set of firm characteristics, such as firm size), I obtained the imabalance indicator: Multivariate L1 distance: 1.9969533 However, the manual says that L1 shall be between 0 and 1. Can anybody help? Cheers Sun Dr Sizhong Sun Lecturer in Economics School of Business, James Cook University, QLD 4814 P (07) 4781 4710 I +61 7 4781 4710 F (07) 4781 4019 E <mailto:sizhong.sun@jcu.edu.au> sizhong.sun@jcu.edu.au<mailto:sizhong.sun@jcu.edu.au> <http://www.jcu.edu.au/>www.jcu.edu.au<http://www.jcu.edu.au> Location: DA27.219 JCU CRICOS Provider Code: 00117J Note: The contents of this email transmission, including any attachments, are intended solely for the named addressee and are confidential; any unauthorised use, reproduction or storage of the contents and any attachments is expressly prohibited. If you have received this transmission in error please delete it and any attachments from your system immediately and advise the sender by return email or telephone. James Cook University does not warrant that this email and any attachments are error or virus free.