nls fails to return correlation matrix (PR#8127)
Carsten.Urbach at physik.fu-berlin.de writes:
Full_Name: Carsten Urbach Version: 2.1.1 (2005-06-20) OS: Linux Submission from: (NULL) (141.34.5.241) I observed one case where nls failed to return the correlation matrix, while the parameter estimates were computed correctly. In the follwing I include all the commands leading to this problem. R was started with 'R --vanilla':
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Residual standard error: 0.001722 on 1 degrees of freedom Correlation of Parameter Estimates: a b c d b 1 c , , 1 d * , 1 e . , * * attr(,"legend") [1] 0 ? ? 0.3 ?.? 0.6 ?,? 0.8 ?+? 0.9 ?*? 0.95 ?B? 1
And the problem was??? You may not like the graphical representation, but it is not a bug. Just use print(summary(fit),symbolic.cor=FALSE) to get rid of it.
O__ ---- Peter Dalgaard ?ster Farimagsgade 5, Entr.B c/ /'_ --- Dept. of Biostatistics PO Box 2099, 1014 Cph. K (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907