Non-linear Least Squares (NLS)
Negative Binomial Pseudo Maximum Likelihood (NBPML)
Tetrads
Gravity dataset without zero trade flows
Apply logarithm to distance column
Ordinary Least Squares (OLS)
Poisson Pseudo Maximum Likelihood (PPML)
Structural Iterated Least Squares (SILS)
Head and Mayer consistent summary statistics
Left-censored Tobit model with known threshold
Eaton1995;textualgravity threshold Tobit model (ET Tobit)
Bonus vetus OLS (BVU)
Eaton2001;textualgravity Tobit model (EK Tobit)
Double Demeaning (DDM)
Discard non-positive and/or non-finite observations in datasets
Fixed Effects
Gravity dataset without zero trade flows
Gamma Pseudo Maximum Likelihood (GPML)
Bonus vetus OLS (BVW)
gravity exported operators and S3 methods
The following functions are imported and then re-exported
from the gravity package to avoid listing Depends of gravity.