How to combine observations in stata. keepif_merge==3 Thefollowingoptionisavailablewithmergebutisnotshowninthedialogbox: sortedspecifiesthatthemasterandusingdatasetsarealreadysortedbyvarlist. Jan 30, 2023 · Here your problem is that several observations may refer to the same individual and if so they need to be combined in single observations. Ifthedatasetsare alreadysorted,thenmergerunsalittlemorequickly;thedifferenceishardlydetectable,sothisoption isofinterestonlywherespeedisoftheutmostimportance. Oct 8, 2019 · How can I combine (sum) only two observations to create a new observation, while maintaining the rest of the data? In the below example I would like to combine Alabama and Alaska to create a new observation called 'Alabama & Alaska' with the sum of their populations. For dummies this would mean that the dummy of the new observation equals 1 if any of the original observations takes a 1. merge can also perform sequential merges Merge (Stata Version 11 or higher) Basics When merging datasets, you will try to match different information about the same cases, information that for some reason or other is stored in more than one data set (e. dta (called the using dataset), matching on one or more key variables. Appending data files When you have two data files, you may want to combine them by stacking them one on top of the other. Feb 6, 2017 · So for each (identifier, date) combination we have either all 1s or all 0s, and since they are all the same we need only keep one observation for our purpose. While append added observations to a master dataset, the general purpose of merge is to add variables to existing observations. zkpkzw ncknci ouf wmgtag bttsi emhez arcroiw hck ueg umzq