the data science process expected distribution frequency - - - distribution with outliers frequency - figure distribution plots are helpful in detecting outliers and helping you understand the variable it shows most cases occurring around the average of the distribution and the occurrences decrease when further away from it the high values in the bottom graph can point to outliers when assuming normal distribution as we saw earlier with the regression exampleoutliers can gravely influence your data modelingso investigate them first dealing with missing values missing values aren' necessarily wrongbut you still need to handle them separatelycertain modeling techniques can' handle missing values they might be an indicator that something went wrong in your data collection or that an error happened in the etl process common techniques data scientists use are listed in table