A review on Taylor's serie for multi-variable scalar-valued functions:

http://fourier.eng.hmc.edu/e176/lectures/NM/node45.html

Profile likelihood

https://stats.stackexchange.com/questions/28671/what-is-the-exact-definition-of-profile-likelihood

The sweep operator: A fundamental operation in regression

https://blogs.sas.com/content/iml/2018/04/18/sweep-operator-sas.html

some reviews on random vectors

http://www.biostat.jhsph.edu/~iruczins/teaching/140.751/notes/notes.html

NLPNRA (nonlinear programming – Newton Raphson Algorithm) call in IML

CALL NLPNRA( rc, xr, "fun", x0 <,opt, blc, tc, par, "ptit", "grd", "hes">);

rc: positive value indicate optimization succed, negative value indicate failure.
xr, returned parameters.

An every clear and simple introduction on the Househoder method for QR decomposition

https://www5.in.tum.de/lehre/vorlesungen/konkr_math/SS_10/vorl/v4_Householder.pdf

pull oneself up by one's bootstraps

 the name of bootstraps method comes from this phrase