I have looked into press fittings and the official term for them is "interference fitting." Also, I'm guessing you want to calculate the "allowance" between the two parts being connected. Internet searching these two terms may help point you in the correct direction beyond the sites below.

Allowance Equation:
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List of common Young's Modulus (also known as the "elastic modulus") values:
click_here

List of common Poisson Ratios: click_here

Young's Modulus explained:
click_here

Poisson Ratio explained:
click_here

Depending on what materials you're interest in, you might have to dig deeper than those websites to get the Young's Modulus and the Poisson Ratio.