 now we are going to do the exercise of merging files in SPSS let's see how we perform the command in SPSS software students we have a file in which we have added data of one side and we want to add data from the other side so how we will add it? we will go to the data we will click on the merge files option and click on add cases when you click on add classes then I have the file to already open in the system so I will select it and continue it and here because the variables are similar there is no change in the variables so they are already selected now if I click on OK then I have the file 2 data you have seen that it has been added first it was the data set of 21 and now it is 42 so now let's see if we have a file so we have to do it how do we locate it from the computer so I will click on this option and external SPSS statistics data file I will browse it here I have the file 3 I want to open it I will continue so here all the same data has come to me and here there is one variable IQ which is unpair so I will click on OK so here you have the command that the procedure has been executed so now if we look at it now so data from 21 to 42 is of 63 that is we have added the data of 21 to 21 in two files so students if you have to add a variable just an existing file on which you have the data of other variables but you want to add one more variable so for that we will go to data we will click on merge files and add variables and here we have the information of that variable so we will open the information where there is a similar respondent and we will browse it we will continue after selecting so we have here this is the variable IQ which we have to add so it has been selected the rest is a similar variable we will click on OK so this command has been executed earlier you did not have an IQ variable now when we browsed that file 3 and merged it so the observations of these 21 respondents have been added in here so you can use the merge file option in SPSS software when you have to work on a big data set so the data coming from different places so in a master file you can integrate without opening those files and without copy pasting the data from those files and on the other side if you are going to add a variable then you have to go back to the respondent so instead of re-entering all the data you can specifically enter the same variable by using the merge file option