Page 3, equation 1.1: add "/h" to the end of the equation Page 4, line 5b: "and another at year 2", should be at year 3 Page 10, table 2.2: The column heading for the right-most column should be "std" rather than "var", the column contains the standard error. Page 27, line -4: It should read d(s), not d(ns) Page 33 line -5: The right-hand square bracket should be moved to after dLambda(s) Page 35, line 14b: remove an extraneous "'5" at the end of the line Page 40, Eqn (3.3): the first r_i(t) should be log(r_i(t)) or X_i(t) \beta Page 40, Eqn (3.7): In the numerator it should read r_i(s), not r_i(t) Page 52, Table 3.1: The column headings should each be one place to the right. Page 58, last two lines of the example: The subscripts should be var[5,5] and coef[5], respectively. Page 74, line 6b: The line begins "model start stop * status"; it is missing a pair of parenthesis and should read "model (start stop) * status". Page 138, line 5: extraneous sentence fragment "different scales using SAS". Page 120, line -2: missing parenthesis on l(\beta, \omega) Page 134, equation 6.6: "d" should be in the denominator, not the numerator. Two lines below it should be dI^{jj} not I^{jj}/d, in agreement with the equation change. Page 156, line 8: Figure 7.1 should be Figure 7.3 Page 176, lines 18-20: The hemoglobin value for subject 1 is 11.5, not 1.5. Page 186, line 16: "independent increments" pp.220-221: The first factor() command uses "PreStudy" as a label, the second "Pre-Study", and the output shows "pstEntry". It should be PreStudy, PreStudy and pstPreStudy. Page 254, equation 9.8: PPL = l + ...., rather than minus. Page 254, line 16: A factor of 1/\theta is missing in the penalty term. Page 267, last equation: The exponent should be 1/r_{(k)}, not -r_{(k)} Page 315: The age of the first subject is 21464 days, not 1464. Page 332, line 2: The very first number in the table should be 1/9, not 1/6. All of the above are repaired in the second printing of late 2001. Several other minor grammatical mistakes, e.g. spelling, have also been corrected. Significant contributors to the errata, with our thanks, are Jim Lindsey, Limburgs Universitair Centrum, Belgium Ornulf Borgan, Department of Mathematics, University of Oslo with further contributions by Goran Brostrom, Umea University Hani Doss, Ohio State University Bob Gray, Harvard University Susan Halabi, Duke University June Juritz Anders Kallen, Astrazeneca Michael Malinchoc, Mayo Clinic Chris Mullin, University of Minnesota Janez Stare, Ljubljana, Slovenia Mai Zhou, University of Kentucky