what is the difference between a regression and a year regression what is the difference between fixed and variable variables in statistics? what does year mean in regression analysis what model has year dummies which model uses years as instruments what is the difference between fixed effect and year model? difference between year and fixed effects what is the difference between a fixed effect regression and a year variable? what is the difference between a fixed effect model and a dummies model? what is the difference between a fixed effect and a dummies model who created the year as an instrument in a regression difference between fixed and instrument variables what is the difference between a fixed effect regression and a year dummy regression what is year dummies used for in regression if year is an instrument how is it determined and what is the difference why year model what is the difference between year dummies and fixed effects models what's the difference between a fixed and instrument variable which model uses year as instrument when is year a fixed effect