Questions tagged [groupby]
A groupby operation: splits the data, applies a function to each group, and combines the results.
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questions
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1answer
59 views
pandas groupby.count doesn't count zero occurrences
I am using groupby.count for 2 columns to get value occurrences under a class constraint. However, if value $x$ in feature never occurs with class $y$, then this pandas method returns only non-zero ...
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0answers
38 views
MongoDB Groupby Rank [closed]
Im Working With Mongodb And Wanted to do a query using Aggregate fucntion. Query Is ...
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1answer
41 views
Using user defined function in groupby
I am trying to use the groupby functionality in order to do the following given this example dataframe:
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0answers
20 views
Accessing group elements in groupby
I had a doubt about groupby operations. Lets suppose I have grouped my data based on one column and got 5 groups as output. I know that we can iterate over these groups and apply functions to them as ...
0
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1answer
31 views
Access keys of pandas dataframe when using groupby
I have the following database:
And I would like to know how many times a combination of BirthDate and Zipcode is repeated throughout the data table:
Now, my question is: How can I access the keys of ...
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3answers
2k views
Pandas Groupby datetime by multiple hours [closed]
I have a log dataset which looks like the following:-
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0
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1answer
293 views
Pandas - Avoid boolean result when using groupby()
I have this script:
sectors = df.groupby(['company_sector']).mean()['investment_in_millions']
Output:
I wanted to keep the same groupy() but having a result ...
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0answers
23 views
Why is the behaviour of groupby command different in R and in python with pandas? [closed]
if I execute the following lines of codes in R as well as python for groupby command, the order of the resulting ...
2
votes
1answer
7k views
How to use df.groupby() to select and sum specific columns w/o pandas trimming total number of columns
I got Column1, Column2, Column3, Column4, Column5, Column6
I'd like to group Column1 and get the row sum of Column3,4 and 5
When I apply groupby() and get this that is correct but it's leaving out ...
2
votes
1answer
110 views
pandas groupby and sort values
I am studying for an exam and encountered this problem from past worksheets:
This is the data frame called 'contest' with granularity as each submission of question from each contestant in the math ...
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1answer
972 views
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0answers
23 views
User defined aggregations on data of around 200GB where row order matters
I am working with "medium large" data of around 200GB. The data are long form log files, where there are several thousand logs for each "entity". The entities are actually flights ...
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0answers
30 views
Custom DataFrame format for exporting to excel sheets
I have the following DataFrame and I want it exported in an excel file with different sheets having different words as shown in the image
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2answers
62 views
Calculating Median and Mode of numerical variables for different subgroups in R
I have customer call data and I want to get the median and mode for the call success rate for different subgroups.
My variables are: Customer ID, Employment Status (Retired, Employed, Unemployed), ...
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1answer
84 views
How to group by one column and count frequency from other column for each item in the previous column in python?
I am trying to group my data by the 'ID' column. Then I want to count the frequency of 'sequence' for each 'ID'. Here is a sample of the data frame:
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0
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1answer
212 views
How to combine rows after Pandas Groupby function
May I know how to combine several rows into one single row after I used Pandas groupby function?
In below example, I would like to to group the data by Employee ID, Customer Last Name and Customer ...
2
votes
1answer
54 views
Normalize data from different groups
I have data that has been grouped into 27 groups by different criteria. The reason for these groupings is to show that each group has different behavior. However, I would like to normalize everything ...
1
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1answer
71 views
Group_by 2 variables and pivot_wider distribution based on 2 others
Performing some calculations on a dataframe and stuck trying to calculate a few percentages. Trying to append 3 additional columns added for %POS/NEG/NEU. E.g., the sum of amount col for all ...
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0answers
18 views
Pushing down Group By clause [closed]
I've studied this exercise in class
But I cannot figure out why, when I push down the Group By clause, I can remove RLCode attribute from GroupBy. Does this action change the meaning of query tree?
0
votes
1answer
279 views
Problem with sort by and group by in pandas
I have a DataFrame with duplicate id's but have different dates.
For Example:
...
