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...- boot (d, compos, R = 3000) ETC. ETC. WHEN I START MY PROGRAM WRITING: d<- rnorm (n, mu, sigma) I HAVE NO PROBLEM. BUT WHEN I READ A VECTOR FROM EXCEL, R TELLS ME "Error en `[.data.frame`(data, indices) : undefined columns selected" CAN YOU HELP ME???? THANK YOU VERY MUCH!!!!! NOEMI FERRERI, ROSARIO, ARGENTINA SCHOOL OF INDUSTRIAL ENGINEERING

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