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hello and welcome to a new allowed tutorial today were going to be discussing how to remove na s missing cases from our data frames to begin with its worth distinguishing between na and na n na means a missing case so where a cell within a data object in our has no value whereas na n stands for not a number and not a number can be derived where you try and perform a mathematical operation on elements that are non numeric in our before we begin to remove and strip out these missing cases that can be problematic for for coming analyses we have to explore and summarize where these na s are within our data to do this we can use simple summary and expiration functions like structure straw head and tail one of the most useful functions that youll find here is that is dot n a function this has the ability to assess for a given element or all elements of a or data object if a missing case is present and it will return a logical value so return true if a missing case is present and false if
