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Cleaning away symbols/whitespace efficiently...

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Reordering columns in data frame once again...

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combine into a data frame vectors of different length but preserving the order...

Imputation for longitudinal data using observation before and after missing data...

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Replacing + by 5 in R...

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removing consecutive duplicates in strings R...

Replacing "?" with the mean...

Python regex manipulation extract email id...

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Determining how to quickly classify columns in huge datasets as factors...

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