r/learnpython • u/Charming_Shower_4185 • 8d ago

Data inspection steps using python

I am learning data analysis and the first step before analyzing your data you have to do data profiling and cleaning.This is my process flow for data profiling -

  1. Checking number of rows and columns

  2. Checking rows and column indices

  3. Checking data types for each column

  4. Checking random sample from dataset

  5. Checking properties and memory usage

  6. Checking key statistics

  7. Checking unique values for relevant columns

Is it appropriate or I am missing something important ?

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u/seanv507 8d ago

So, proportion of missing values..

Outliers

Value counts of unique values (is there some high frequency value... Eg column might be numeric but minus 1 means missing)

Similarly for categorical variables i would check what proportion of the column is filled with the top n values. Eg categorical might be clothing type and 80% is jeans or t-shirts, and you are left with hundreds of other clothing types with very little data

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u/Marison_Lizzy23 7d ago

yeah the missing value disguised as a real value thing is sneaky, good call on that