These results hold for the $1.25 a day poverty line as well. Furthermore, unobserved heterogeneity across countries can be a cause of more serious bias. Time-series data on poverty provided by the new estimates can help alleviate some of these problems. As with per capita GDR the fitted lines show similar relationships between exports and poverty levels for the two sets of poverty estimates (the slope for the new poverty data is -0.831, with t-ratio of -28.8 and for the World Bank data -0.93 with -26.4 t-ratio).