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today were going to talk about propensity analysis matching groups using some baseline characteristics so that we can make the groups comparable we cannot randomize this study so we have to do an alternative method in order to compare them Im going to be using data collected by a private clinician over a period of 17 years he helps children control their myopia progression that is keep them from becoming more nearsighted he does this with two types of lenses spherical lenses that shape the cornica cornea and aspheric lenses that shape the cornea was called ortho teratology so unfortunately the design of the study was that for ten years the clinician prescribed these spherical lenses and then he went to a conference and he heard about a spherical lenses and was so impressed that he went home and abruptly changed his practice to only a spheric now this is great from the perspective of the patients but its pretty hard to do a study on this so we are going to use propensity analysis to