If you think about leakage its effectively a resistive kind of component in parallel
with cap....? So that would not affect the value of C one would think.
However esr, being in series, definitely effects the "effective" value of a cap. One
can use the series to parallel transform to find the effective C. And vice versa,
one can use parallel to series to get a proper design value. Not usually used
for electrolytic, one just normally uses more C to offset esr effects. Diminishing
returns I might add.
I am not, however, an expert in any field, so take above with a grain of salt.
I do often look at actual spice models to see how complete they are as often
they are very simple, too simple, for precision analog work. Often incomplete,
not representing the device topology. Good example of this these days are RRIO
OpAmp inputs, their crossover distortion resulting from non ideal switch over
between N and P channel input structures. High res A/D work where this matters
for example.
Regards, Dana.