data-manipulation

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Calculate ratio of specefic rows
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dplyr rows data-manipulation dataframe r
convert quarterly data to monthly in python pandas by dividing the variable by 3
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263
pandas data-manipulation python
Group by id and drug (with dates <100 days of each other) take the earliest and latest date
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51
data-manipulation r group-by
Convert longitudinal data to edgelist and nodelist
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35
data-cleaning data-conversion social-networking data-manipulation r
Creating A New Calculated Category Within A Column in R
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calculated-columns data-manipulation categories dataframe r
Add a column to one data frame based on multiple values in another by index number
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31
data-manipulation dataframe r merge
Choosing words not containing specific strings in R
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41
data-manipulation r string
R: only keep rows whose values differ from values in another column
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26
data-manipulation r
Create binary indicator dependent on previous row using Python and Pandas
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53
feature-extraction feature-engineering pandas data-manipulation python
Split variable into multiple multiple factor variables
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one-hot-encoding dummy-variable data-manipulation dataframe r
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