Ask Dr. Jain

Ask the Forecasting & Planning Guru

Do you have a question you need answering about forecasting and demand planning? Need help with understanding a particular concept, model or process? Dr. Jain is here to help. Ask your question by filling out the form below, and his response will appear here.

Dr. Chaman Jain is the author of ‘The Fundamentals of Demand Planning and Forecasting’, the seminal work that defined best practices used the world over. He is a Professor of Economics and Finance at St. John’s University, and editor of the Journal of Business forecasting.

Ask Dr. Jain: How to Forecast for the Toy Industry?

What Is Forecast Bias?


How Do I Calculate Lost Sales From A Stockout?

Ask Dr. Jain: Where To Put The Forecasting Function For Lowest Forecast Error?

What Is Upward & Downward Bias In Forecasting?

Ask Dr. Jain: How Can I Show Management That Forecasting Training Will Increase Profits?

Ask Dr. Jain: What Are The Forecast Accuracy Benchmarks In Retail?

Ask Dr. Jain: How Do I Get Started With Holt Winters Exponential Smoothing?


Ask Dr. Jain: How Can I Gauge Demand Planners’ Performance?

Ask Dr. Jain: How Do I Implement Demand Planning For My Services Company?

What Is The Best MAPE Formula To Use for Forecasting?

How Can I show My Company Aggregate Level Forecasting Isn’t Enough?