I program algorithms in Mathematica, to develop models while working very closely with the data. Updated models are then programmed into Excel for day-to-day implementation. If I were younger and trained specifically in stats, I’d probably use more R or Python. I started studying AI in its early days, and for people interested in learning the skills to do all this, I suggest machine learning.
My “what going into the model” article gives a lot more detail about the parameters incorporated.
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