As a freelance data analyst, your duties are to collect data and interpret it for your client on a contract basis. Data analysts can work in many industries and fields, including sales, logistics, social science research, government and nonprofit, market research, banking, and healthcare, to name just a few. Your specific responsibilities may differ depending on the field. However, generally, you use a variety of analytical tools to assess things like sales numbers and performance, identify market trends, and write reports that chart your analysis and provide recommendations for future strategies.