A
useful approximation is a close estimate or guess that helps us understand or solve something, even if it's not 100% accurate. It's a helpful and practical way to get an idea or answer without needing complete precision.
Full definition
Equations like the above let you approach the problem analytically, in that I can calculate
useful approximations like the derivative of mortgage length with respect to downpayment, or interest rates, or payment amount, or payment frequency, in a continuous manner.
The Ackermann steering mechanism is a
very useful approximation but it is an approximation and is only correct straight ahead and at one steer angle.
Truth be told, most economists regard Homo economicus as
a useful approximation to plug into their models, not a representation of how individuals actually behave.
Nevertheless, for the low levels of correlation we observe here, it is
a useful approximation that allows us to make effective comparisons between disparate correlations measured on different horizons.
a useful approximation, particularly when analyzing the direction in which prices move when crossing critical points
Municipal bond funds are not a separate listing, but adjusting yields for long - term government bond funds or money market funds for taxes (1.00 minus your federal tax rate in decimal form times the government bond or money market yield) will give
you a useful approximation.
While Efficient Market Hypothesis is
an useful approximation to how the stock market works, it does not work in all situations.
Such a simple model is dubious to begin with, no one really believes it is «true» (although it may still be
an useful approximation).