what is common base year index why is indexing used what is the common base year for regression analysis should you index different base years in regression can you do indexing regression on different base years if the y variable is 100 is the index should the y variable be an index why do we index the y in regression should base years be used in regression what is common base year regression indexed regression vs indexing should you index causality based on a common base year how do we index and model regression how to index regression how are causalities indexed? are causals indexed on different bases is a common base year a regression? can you index a causal variable on a different base year are y indexed on different base years? how to do a regression analysis using indexed data.