I have been reading some Economic Development and Policy Research papers and I realise there is extensive employment of econometric tools and models. For example, one of the papers used an Oaxaca Blinder decomposition to assess differentially the covariate and coefficient effects (the model studied the Height For Age (HAZ) differentials between two states); Quantile Regression based Counterfactual Decompositions; Tobit models; Lin-Log models etc. I'm interested in economic research theory and I need to know which econometric model specifications are mostly used in such studies. What are some of the most common techniques used for economic policy and trend analysis? Please provide some examples for the same. Thanks!