00393nam a2200121 a 450000500170000002000150001708200170003210000340004924500970008326000290018030000240020949000380023320251203110823.0  a0387202757  a610.727bREG  aVittinghoff, Eric .. [et.al.]  aRegression methods in biostatisticsblinear, logistic, survival and repeated measures models  aNew YorkbSpringerc2004  axv,340p.c24 cm. HB  aStatistics for biology and health