Research articles, especially in the STEM fields, have a rigid structure that almost all journals will expect to be followed. This makes sense, as it forces publications to be uniform, easier to follow, and allows for the reading of particular sections. Someone interested in the statistical methods used, doesn't need to skim through the whole article to find them. They will be included in the methods; thus only the methods would need to be read.
While the structure of research articles has several advantages, it can unfortunately be overly confusing, both for new and seasoned scholars alike. It can be hard to know what to include in each section. Too often you can find yourself wondering "Does this go in the results or in the discussion?" Below is a summary of each section of a structured research article.