Outlier correction

Back to Routine case data from DHIS2

Check for normality

Shapiro-Wilk’s test

D’Agostino’s K-squared test

Anderson-Darling test

Outlier detection

Z-score method (if normally distributed)

Modified z-score (adjusting the threshold)

IQR method (if not normally distributed)

Modified IQR (adjusting Q3 to 95th/99th percentile)

Boxplot method

Strip plot

Outlier correction

Replacing with Mean Including Outlier in Mean Calculation

Replacing with Mean Excluding the Outliers in Mean Calculation

Replacing with Median Including Outlier in Median Calculation

Replacing with Median Excluding the Outliers in Median Calculation

Replacing with Simple Moving Average Including Outlier in MA Window Calculation

Replacing with Simple Moving Average Excluding Outlier in MA Window Calculation

Z-Score Adjustment

Capping and Flooring