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...lapse="+"),sep="~")) I am grateful for any pointers that direct me to a fix for this problem and/or to a better understanding of its root cause. Thanks and regards, Ulrike -- View this message in context: http://www.nabble.com/Problem-with-correct-usage-of-formula-environment-tp25136335p25136335.html Sent from the R devel mailing list archive at Nabble.com.