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Table 2 A comparison of coefficients on GDP per capita by IMR transformation

From: Are infant mortality rate declines exponential? The general pattern of 20th century infant mortality rate decline

Country Years Box-Cox
IMR transformation
λ = "Best Fit"
Log IMR transformation
λ = 0
 
   Coefficient on GDP per capita Coefficient on GDP per capita Coefficient gap
Whole sample   -0.065 *** -0.078 ** 0.013
Australia 1921–1999 0.217 *** -0.034 ** 0.251
Austria 1947–1999 0.151 *** 0.079 0.072
Belgium 1900–1913
1918–1999
-0.070 *** -0.09 ** 0.02
Canada 1921–1999 -0.038 *** -0.051 ** 0.013
Denmark 1900–1999 -0.057 ** -0.06 ** 0.003
Finland 1900–1999 -0.088 *** -0.106 ** 0.018
France 1900–1999 -0.084 *** -0.11 ** 0.026
Italy 1900–1999 -0.151 *** -0.132 ** -0.019
Japan 1947–1999 -0.020 *** 0.026 -0.046
Netherlands 1900–1999 -0.023 *** -0.004 -0.019
New Zealand 1947–1999 0.035 0.068 * -0.033
Norway 1900–1999 -0.004 -0.046 ** 0.042
Portugal 1940–1999 -0.366 *** -0.233 ** -0.133
Spain 1908–1999 -0.127 *** -0.154 ** 0.027
Sweden 1900–1999 -0.062 *** -0.062 ** 0
Switzerland 1900–1999 -0.009 -0.031 ** 0.022
UK 1900–1999 0.145 *** -0.031 ** 0.176
USA 1933–1999 -0.009 -0.009 0
  1. No mortality data are available for Belgium from 1914–1918. USA has IMR time series that is best fit as logarithmic. Bold coefficient gaps are for countries where coefficients are significant in both models.***p < 0.01, ** p < 0.05, *p < 0.10 for null that coefficient = 0.