[R] What does exp(-coef) mean?

[peter dalgaard]

On 15 Apr 2015, at 13:11 , Anniek <anniek at brinkonline.nl> wrote:

> I know that exp(coef) is the Hazard Ratio, but in a certain output posted
> down here also a exp(-coef) is present. 
> 
>               exp(coef) exp(-coef) lower .95 upper .95
> ns(CD4, 4)1      0.29058     3.4413  0.144075    0.5861
> ns(CD4, 4)2      0.09870    10.1316  0.029075    0.3351
> ns(CD4, 4)3      0.03475    28.7806  0.007375    0.1637
> ns(CD4, 4)4      0.10211     9.7933  0.019234    0.5421
> drug[T.ddI]      1.31900     0.7582  0.989748    1.7578
> AZT[T.failure]   1.46116     0.6844  1.087839    1.9626
> 
> What does exp(-coef) mean? 
> 

The inverse hazard ratio. (As in e^-x = 1/e^x).


> Thank you in advance! 
> 
> 
> 
> --
> View this message in context: http://r.789695.n4.nabble.com/What-does-exp-coef-mean-tp4705897.html
> Sent from the R help mailing list archive at Nabble.com.
> 
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Office: A 4.23
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com