This is the analysis I was refering to:
"Using their figures and those from https://www.pewresearch.org/fact-tank/2019/05/22/u-s-fertility-rate-explained/ I conclude that an increase in the tax value of the personal exemption of $130 would (all else held equal) get us at least back to replacement level, and $525 at least back to our 1960-ish peak."
It's not yours? It's clearly not theirs.
You've said we can greatly increase the birthrate of native Americans and I'm just looking for something to back that up.
This is the analysis I was refering to:
"Using their figures and those from https://www.pewresearch.org/fact-tank/2019/05/22/u-s-fertility-rate-explained/ I conclude that an increase in the tax value of the personal exemption of $130 would (all else held equal) get us at least back to replacement level, and $525 at least back to our 1960-ish peak."
Then your original question was ill-posed; what I posted is not a multivariate analysis, but a simple arithmetic application of the paper's multivariate analysis to a few data points culled from the Pew link.
If you'd like to admit you're in over your head here and have me to walk you through the arithmetic, I can do that.