Estimation Methods for Gravity Models


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Documentation for package ‘gravity’ version 1.1

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bvu Bonus vetus OLS (BVU)
bvw Bonus vetus OLS (BVW)
ddm Double Demeaning (DDM)
discard_unusable Discard non-positive and/or non-finite observations in datasets
ek_tobit Eaton and Kortum (2001) Tobit model (EK Tobit)
et_tobit Eaton and Tamura (1995) threshold Tobit model (ET Tobit)
fixed_effects Fixed Effects
gpml Gamma Pseudo Maximum Likelihood (GPML)
gravity_no_zeros Gravity dataset without zero trade flows
gravity_zeros Gravity dataset without zero trade flows
hm_summary Head and Mayer consistent summary statistics
log_distance Apply logarithm to distance column
nbpml Negative Binomial Pseudo Maximum Likelihood (NBPML)
nls Non-linear Least Squares (NLS)
ols Ordinary Least Squares (OLS)
ppml Poisson Pseudo Maximum Likelihood (PPML)
sils Structural Iterated Least Squares (SILS)
tetrads Tetrads
tobit Left-censored Tobit model with known threshold