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Insert new row indicating time gap between rows...

Looping through multiple columns to apply conditional transformations...

Order variable names by custom numeric pattern...

Mutate a column based on pairing pattern...

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Shifting values up rows in a dataframe in R by group...

Summarise into strings based on condition from other column...

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Using `case_when` and `mutate` to search multiple columns for conditional...

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Can I group_by columns with starts_with?...

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Iterating a mutate function across different variables in a dataframe...

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Fill NAs when you have zeros in your dataset...

Calculating standard errors of means by groups...

Calculate days from start in R...

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Return NA for conditional lead/lagged rolling sum if window outside dataframe or group...

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