R Nonlinear Multiple Regression See the results in: https://www.researchgate.net/publication/326279470_An_Investigation_on_the_Correlation_of_Inter-story_Drift_and_Performance_Objectives_in_Conventional_RC_Frames For the data.xlsx file contact saeed.rastegarian@rwth-aachen.de *Based on Morteza Najibi and Matthew Stewart open source contributions.