Studies with aggregated data are too crude a tool to measure effects, also, the data are full of unmeasured confounding variables and ecological and other fallacies.
Studies with aggregated data are too crude a tool to measure effects, also, the data are full of unmeasured confounding variables and ecological and other fallacies.
Studies with aggregated data are too crude a tool to measure effects, also, the data are full of unmeasured confounding variables and ecological and other fallacies.