

References for fitting GAMs with covariates in R
Taken from Ryan, L., Wand M. and Malecki A. (2016) Bringing coals to Newcastle. Significance 13(6) 32-37. (Copy of this paper is in the PDF in this folder).

Wood SN (2006) Generalized Additive Models: An Introduction with R. Boca Raton FL: CRC Press.
Wood SN (2015) packaes "mgcv", R packages version 1.7.