On Wed, 05 Nov 2003 09:22:34 +1000 Ross Darnell <[EMAIL PROTECTED]> wrote:
> I have fitted a logistic regression model > > > failed.lr2$call > lrm(formula = failed ~ Age + task2 + Age:task2, data = time.long, > na.action = na.omit) Use Age*task2 and omit na.action as na.omit is the default > > using the Design package functions and would like to generate a > nomogram from this model. > > the datadist information is generated and stored in > > > ddist > time.long$Age time.long$task2 > Low:effect 45 <NA> > Adjust to 56 both.foam > High:effect 68 <NA> > Low:prediction 21 both.foam > High:prediction 80 right > Low 20 both.foam > High 80 right This looks most strange. You did not include the original code but I suspect you had $ in a term. $ should not appear in column headings above. Design wants you to use data= or attach, and avoid $ in terms. Frank Harrell > > Values: > > time.long$task2 : both.foam left right > > > > The model fitted and then when I try the nomgram function > > > nomogram(failed.lr2) > Error in value.chk(at, i, NA, -nint, Limval, type.range = "full") : > variable Age does not have limits defined by datadist > > > > I get an error. The NA values in ddist seem to be the problem but I > don't understand the datadist information. > > Can anyone help explain why this is failing. > > Thanks > > Ross Darnell > > -- > > University of Queensland, Brisbane QLD 4067 AUSTRALIA > Email: <[EMAIL PROTECTED]> > Phone +61 7 3365 6087 > http://www.shrs.uq.edu/shrs/school_staff/ross_darnell.html --- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help
