In my study I've 3 levels, 2 treatment and 1 control effect. I want to do propensity score matching at 3 level. Could anyone please guide me how to proceed doing PSM. Also, if there's any literature I can refer to.
You need a multinomial model to estimate the probability of being assigned to each of the three groups. From that you create TWO propensity score variables, and use both in the matching.
ANOVA, or Analysis Of Variance, is used to compare the averages or means of two or more populations to better understand how they differ. Watch this tutorial for more.