Hello, im trying to plot gain of a transistor in ltspice verse frequency. The voltage gain that is of V(collector)/V(base) of a biased npn transistor. I can use measure to get the peak to peak values but cannot figure out how I can plot it.

 

Looking at your file, it appears that you are trying to mix two different types of simulations. Do you want to do a Bode plot of frequency response of the transistor linearized for small signals around its bias point (.AC analysis, frequency domain), or do you want to do a time domain with sinosoidal stimulus at stepped frequencies (.tran analysis)?