How is the data filtered?
For each category you select (job title, years of experience, area of specialization, region), SalaryScan examines all the data that match your criteria, and returns only data that match your criteria. For quality control, outliers in the raw survey data were filtered using variability from a standard deviation per job category before being incorporated into SalaryScan. Standard deviation describes the distribution of responses around the mean. The smaller the standard deviation, the more consistent the dataset around the average. Thus a large standard deviation creates a wide distribution of responses. Any data that were more than three standard deviations from the mean were excluded from SalaryScan results, subject to the sample size for that category. Further deletions were made for inconsistent data responses indicated by prior survey submissions. This filtering methodology was employed to remove outlying data from the survey sample, and the resulting dataset represents 99% of the
