Evaluating Pharmaceutical Marketing to Physicians with Panel Data

This paper by Mizik and Pavlov explores the application of panel data methods in marketing research, emphasizing their advantages over cross-sectional and time-series data by addressing individual heterogeneity and dynamic processes. The authors discuss various static and dynamic panel data models, including random effects and fixed effects, and highlight potential estimation issues and biases, particularly in dynamic models and when unobservable factors are present. Furthermore, they examine the challenges posed by measurement error in panel data and the problem of bias spreading in multivariate models, offering insights into appropriate model selection and specification testing using techniques like the Hausman test. The work underscores the importance of carefully considering these methodological aspects for accurate and insightful analysis of longitudinal marketing data, illustrated through an empirical study on pharmaceutical marketing effectiveness.