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bolstad
2009 Aug 01
2
Cox ridge regression
...troduce any new predictors. What to make of the ridge(age) and
ridge(ph.ecog) rows in the output?
Question 3. What is the origin and significance of the warning in the
previous example:
Warning message:
In sqrt((diag(x$var2))[kk]) : NaNs produced
Thank you very much for your help,
Ljubomir
[1] Bovelstad et al., Predicting survival from microarray data - a
comparative study (Bioinformatics, Vol. 23, no. 16, 2007,
pp. 2080-2087).