Re: [R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-11-19 Thread David Winsemius
On Nov 19, 2012, at 1:57 AM, wouterjohannes wrote: No, I never got any response. I used an article by Knol to solve the issue. Ik hope this is useful for you too. Best regards, Wouter Knol, M.J., van, d.T., Grobbee, D.E., Numans, M.E., Geerlings, M.I., 2007. Estimating interaction on a

Re: [R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-11-19 Thread wouterjohannes
Hi, No, I never got any response. I used an article by Knol to solve the issue. Ik hope this is useful for you too. Best regards, Wouter Knol, M.J., van, d.T., Grobbee, D.E., Numans, M.E., Geerlings, M.I., 2007. Estimating interaction on an additive scale between continuous determinants in

Re: [R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-11-18 Thread Frank Harrell
In many situations the interactions indicated by additive risk models are false in the sense that they merely reflect restrictions so that risk are in [0,1]. I tend to prefer models that have no restrictions on the parameters. In fact, I think that a test of goodness of fit of a model can be made

Re: [R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-11-18 Thread Uwe Ligges
On 16.11.2012 02:39, sarahw wrote: Did you ever get a response to this or resolve this yourself? You sent a message to the mailing list, but apparently not to the original poster. Uwe Ligges Many thanks! -- View this message in context: http://r.789695.n4.nabble.com/additive-inter

Re: [R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-11-15 Thread sarahw
Did you ever get a response to this or resolve this yourself? Many thanks! -- View this message in context: http://r.789695.n4.nabble.com/additive-interaction-for-a-dichotomous-dependent-variable-i-e-risk-difference-tp4635842p4649687.html Sent from the R help mailing list archive at Nabble.com

[R] additive interaction for a dichotomous dependent variable (i.e. risk difference)

2012-07-09 Thread wouterjohannes
Dear all, For my research I want to test additive interaction for a dichotomous dependent variable. Can anyone help me to estimate this in R? Wacholder describes this procedure in the American Journal of Epidemiology in 1986 (Binomial regression in GLIM: estimating risk ratios and risk differenc