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I am learning a distributed lag non-linear model. In that, I have to create a cross basis matrix first. For cross-basis, I need to specify the knots at equally spaced values of the temperature variable.

This is the script I am using

ktemp <- equalknots(data$temp,nk= ?)

What should be the nk value here? How should I choose the value that represents equally spaced values of temperature variable?

Thanks

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  • $\begingroup$ You are asking about how the function equalknots works: please consult its documentation. (It isn't clear what the source of this function is or if it is even publicly available.) $\endgroup$
    – whuber ♦
    Commented Jul 23, 2020 at 14:21

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