Hello,<br><br>My analysis shows that the exponential regression gives the best result (r^2=87%)--power regression gives worse results (r^2=77%). Untransformed data gives r^2=76%.<br><br>I don't think you want lognorm. If I'm not mistaken, that fits the data to a log(normal distribution random variable). <br>
<br>So, take the logarithm (to any base) of all the "conc" values. Then do a linear regression on those values versus "sizes".<br><br>Try (semi-pseudocode):<br>slope, intercept, p, error = scipy.stats.linregress(sizes,log(conc))<br>
<br>Ian<br>