I have a set of data points as show in the above figure. The data points were then binned together such that there are enough data points in each bin.

After binning, I determine the variance of each bin as shown in the color plot below where the color represent the variance value.

(Dark blue (smallest variance) - yellow(highest variance))

Since the variance determine is some what dependent of the number of data points and the area of the bin, is there any way I could "normalize" the variance value such that the larger area variance can be compared with the variance of the smaller area.

Thank you!!!