There are a few methods in estimation. Like framework, unknown parameters, empirical dist and substitution principle most of these methods can be used using substitution principles.
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There is no single word. Mathematical methods, alone, could involve analytical methods, statistical methods of estimation or numerical methods for approximation.
Parametric and Non Parmetric are the of power spectrum estimation of random signal. in nonparmetric method there no assumtion about how the data is generated of which power is to be calculate. sanket lichade
If an estimation, or estimate, is a guess, an approximate estimation is a rougher guess.
Estimation is a quick of working out roughly what the answer is
Rounding is a form of estimation.