One of the foundational skills of a data analyst is the ability to clean and preprocess raw data. A written test for data analysts often includes questions that assess knowledge of data cleaning techniques and methods for handling missing or inconsistent data. A common question might be: “You are given […]
With these KPIs in hand, it is necessary to create a routine for measuring these results monthly, so that actions can be improv and optimiz every month, making the results gradually improve. Learning how to calculate ROI is equally important. ROI ( Return Over Investment ) indicates, quite succinctly, whether […]
