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validate function in Design library does not work with small samples

2 messages · spok, Frank E Harrell Jr

spok
# 
Hi,

I am using the validate function in the design library
to get corrected Somer's Dxy for cox ph models.  When
my sample size is reduced from 300 to 150, the
function complains (length of dimnames[1] not equal to
array) and does not produce any results.  There are no
missing values in the data.  Any suggestions for a
work-around?

Thank you in Advance.
f.total=cph(Surv(fu,censor)~predictor+pred2+pred3,data=data,x=T,y=T,surv=T)
Backwards Step-down - Original Model

No Factors Deleted

Factors in Final Model

[1] pred2
.Random.seed: 1 -1021164091 1170333634 in .GlobalEnv 
Iteration:
1 2 3 4 5 6 7 Error in fit(NULL, y[train, , drop =
FALSE], iter = i, tol = tol, ...) : 
        length of dimnames[1] not equal to array
extent
Frank E Harrell Jr
# 
On Fri, 25 Apr 2003 07:45:16 -0700 (PDT)
spok <spok_1 at yahoo.com> wrote:

            

      
      
      
    

        
In general it is best to contact the package maintainer directly.  Also, be sure to give the output of typing the command 

  version

and the version number of the package you are using.  For your problem please run save( ) to save f.total and e-mail it to me as an attachment, then I'll debug.  I'm glad you issued the set.seed command which should help me replicate the problem.

Frank

---
Frank E Harrell Jr              Prof. of Biostatistics & Statistics
Div. of Biostatistics & Epidem. Dept. of Health Evaluation Sciences
U. Virginia School of Medicine  http://hesweb1.med.virginia.edu/biostat