acylam questions

acylam answers

• Conditional summing across columns with dplyr
• How to convert a character timestamp into a date-time object in R
• Extract all characters to the left of a list of possible characters
• Subsetting data by multiple values in multiple variables in R
• Tokenizing sentences with unnest_tokens(), ignoring abbreviations
• pad missing dates in a dataframe with several columns
• dplyr mutate using character vector of column names
• Using group_by() from dplyr with predict.lm and do() in a pipe for year linear extrapolation
• concatenate quosures and string
• Reshape values from 1 column and attach to existing column name