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In this short video, I will show you how to select and omit values when looking at a dataset in RStudio. To provide examples, I have loaded up some test data that contains ten rows and two columns. Lets start by looking at specific rows. Supposing we wanted to View row 10, we would use the square brackets, and place the number 10 and a comma inside the brackets. This will limit the view function to that specific row. To select columns, you could use square brackets and put the number of the column after the comma. However, providing you have headings in your dataset, you can specify the name of the column with the dollar sign. So, if we wanted to calculate the sum of column A. We would use the name of the dataset, which in this case, is test data, followed by the dollar symbol, followed by the name of the column. If we wanted to limit it to specific range, we could combine it with square brackets. So we could say, what is the sum of column A, but limit that to,