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hey everybody today Iamp;#39;m using the case when function from the D plier package to add a column to a data frame based on values from one or more other columns I am going to be looking at the Gradebook data set which Iamp;#39;ll put which Iamp;#39;ll post to my GitHub and Iamp;#39;ll put a link to that down below here you can see weamp;#39;ve got 34 entries each one representing a student and in each case we have a numerical score between 0 and 100. what Iamp;#39;d like to do is to get a new column here with a letter grade and Iamp;#39;d like to give students that have at least a 90 an a students that have at least an 80 a b and so on down um so Iamp;#39;ve pulled up the help file for case when again thatamp;#39;s in the D plier package and this is just a generalization of if else and let me actually make a comment about that and when I say if else I mean the literal command if else which lets you put a conditional then two values based on whether the conditional is true o