With no explanation, label text_A→text_B with either "no" or "yes".
text_A: Method 1: We look directly at how vaccination status correlates with smallpox survival in general. Method 2: We look at this correlation case by case according to vaccination reaction.
text_B: To understand how vaccination status affects smallpox survival, is it more correct to use the Method 1 than Method 2?
yes.