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welcome back to quantitative reasoning in the previous tutorial we learned how to find out about the format of a data frame for example how many rows and columns are there what are the column names in this video we learn how we can access individual elements in a data frame and build subsets consisting of selected rows or columns do you remember how we accessed elements of a vector we used square brackets for example scores in square brackets three returns the third element of the vector scores for data frames its similar the only difference is that for vectors it was enough to put a single number inside the square brackets but data frames have rows and columns so we must identify elements with two numbers lets look at an example if you dont have our titanic project open right now please reopen it and click on titanic.r to open the script in the editor pane next we run the read.csv command to bring the titanic data frame back into our environment lets open the data frame as a spre
