This work was carried out to evaluate the performance of three soybean seeds lots according to the eletric conductivity test and to verify the influence of the number of replicates in the estimates of the parameters from the Weibull function. All seeds lots had different qualities. The seed lot L1, had parameters with performance ?dose to linear?. The others ones were ?far from linear?. It was verified that the seeds from lots L2 and L3 had worst performance because the instability of parameters set. The Hougaard coeficient (g1), the percentage of bias and the relative curvature can help identify differences in seeds lots according to combination Weibull function and data set.