applying ggscatter on X & y both are double
ggscatter(merged_clean, x = "Doctors", y = "val",
add = "reg.line", conf.int = TRUE,
cor.coef = TRUE, cor.method = "pearson",
xlab = "Estimated Doctors Density per 1000", ylab = "HIV Mortality rate per 100 0000")
leading to: Error in FUN(left, right) : operations are possible only for numeric, logical or complex types
