Top Questions

1. Remove rows where all columns except one have NA values?
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2. How do I create a column based on values in another column which are the names of variables in my dataframe whose data I want to fill newcol with? R
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3. How can I combine several columns into one variable, tacking each onto the end of the other and grouping by values in an ID variable?
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4. How can I edit my regex so that it captures only the substring between (and not including) quotation marks?
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5. How to write a simple for loop that will populate a new column based on values in an old column, using key-value pairs?
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