Is this possible? For example, cancer registry data have age groups cut off at 4s (i.e., 25-34, 35-44, etc.). If a sample population provides data with ages of 5 as the cutoff, how can I correct this so it has similar intervals to the cancer registry data age intervals? My overall goal is to indirectly standardize the study population for which I have total observations and age structure; however, if it doesn't match the same age intervals as the standard population, what's the solution? Thank you!