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...TRUE) gsecor <- cor(gse20437, method ="pearson") or gsecor <- cor(gse20437) [/code] i get error x must be numeric.. can anybody help me. thanks in advance -- View this message in context: http://r.789695.n4.nabble.com/Urgent-Help-with-R-calculation-correlation-coefficient-tp3074206p3074206.html Sent from the R help mailing list archive at Nabble.com.