A data frame of 210 patients with Chronic Myeloid Leukemia from the Benelux
CML study (Kluin-Nelemans et al. 1998). Data have been used in two
methodological papers, de Bruijne et al. (2001) and van Houwelingen (2007),
and in the book van Houwelingen \& Putter (2011), especially Chapter 8. More
background is given in Appendix A.2 of van Houwelingen \& Putter (2011).
Interest is in the time-dependent covariate White Blood Cell count (WBC).
wbc1 contains the follow-up data and time-fixed
covariates, while wbc2 contains the WBC measurements. The included variables
in wbc2 are
Patient identification number
Time of WBC measurement in years from randomization
Log-transformed and standardized WBC measurement, more precisely, defined as lwbc=log10(wbc)-0.95
A data frame, see
Kluin-Nelemans JC, Delannoy A, Louwagie A, le Cessie S, Hermans J, van der Burgh JF, Hagemeijer AM, van den Berghe H \& Benelux CML Study Group (1998). Randomized study on hydroxyurea alone versus hydroxyurea combined with low-dose interferon-alpha 2b for chronic myeloid leukemia. Blood 91, 2713–2721.
de Bruijne MHJ, le Cessie S, Kluin-Nelemans HC \& van Houwelingen HC (2001). On the use of Cox regression in the presence of an irregularly observed time-dependent covariate. Statistics in Medicine 20, 3817–3829.
van Houwelingen HC (2007). Dynamic prediction by landmarking in event history analysis. Scandinavian Journal of Statistics 34, 70–85.
van Houwelingen HC, Putter H (2012). Dynamic Predicting in Clinical Survival Analysis. Chapman \& Hall.