Find capacitance from nonlinear I-V curves

[Hyo X]

I have some experimental circuit element that exhibits both resistance and capacitance, and results in nonlinear I-V curves.
can i extract capacitance and resistance of this element just from the I-V curve? or do I need time-axis data?
a suggestion on what equation to use to fit this data? thanks.

 

[donpacino]

you need time data to measure capacitance