I am analyzing data from four different countries. However, I would as well like to conduct an analysis of all four of these countries. The problem is that my data set is constituted by 1200 observations from every country. I would like to weight these observations according to the population of the country. E.g. the observations of a country with a big population has a higher weight than observations for countries with a small population. Is there a tool in SPSS to weight my data according to population?