Questions tagged [data-table]
The data-table tag has no usage guidance.
16
questions
0
votes
2answers
23 views
Identifying patterns in tabular data
I have a set of tables containing some thousand entries and some tenths of columns from machine status values of production. The entries are of mixed types like string, float, or timestamp. Each table ...
1
vote
1answer
19 views
Pandas: Group by Single Column Entries [closed]
So have this table above. I'm trying to aggregate the occupations such that the table results in:
I've tried using df.groupby(['Occupation']) but I get an error.
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0answers
33 views
Predicting next rows in tabular dataset
I have a tabular dataset of financial transactions with a target binary variable 'isFraud' which indicates if the transaction is fraud or not.
I want to build a model that given some past trasactions, ...
1
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0answers
22 views
Are there decisive leaders in programming with tabular data?
What are the most effective bread-and-butter in-memory open source tabular data frameworks today? I have been working with tabular data for years with an in-house solution that integrates with Excel ...
1
vote
0answers
974 views
Calculating % by Dividing Filtered Matrix Columns in MS Power BI
Given: A monthly percentage (%) metric has to be calculated from dividing a column ('Numerator') from one table by a column ('Denominator') from another table, both filtered by month, as given in an ...
0
votes
1answer
84 views
How do you see the element of a csv table with many columns (>30) which the names of its columns is more than 10 character in pandas?
How do you see in pandas the element of a csv table with many columns (>25) which the names of its columns is more than 10 character?
I have 5000 rows and 32 columns and the label of some columns ...
9
votes
4answers
46k views
How to Write Multiple Data Frames in an Excel Sheet
I have multiple data frames with same column names. I want to write them together to an excel sheet stacked vertically on top of each other. And between each, there will be a text occupying a row. ...
3
votes
2answers
4k views
Mean across every several rows in pandas
I have a table of features and labels where each row has a time stamp. Labels are categorical. They go in a batch where one label repeats several times. Batches with the same label do not have a ...
0
votes
1answer
51 views
Software for automated database processing
I faced a problem which I'd like to solve w/o any programming. And looking for a software to do this.
I have a dataset, for example: (brand-id, brand-name, product-class-name;)
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1
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2answers
1k views
Theoretical Question: Data.table vs Data.frame with Big Data
I know that I can read in a very large csv file much faster with fread using the data.table ...
3
votes
1answer
293 views
Look for previous date in dataframe that has certain column category in R
I have the following data frame:
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2
votes
1answer
29 views
How to make smaller categories with factor character variables
I have this data set with consist of ISO3166 Alpha-2 codes for countries.
Example: DE, AD, AE etc
They are coded as factor variables in R and there are about 173 observations.
Now because there are ...
3
votes
4answers
2k views
rows to columns in data.table R (or Python)
This is something I can't achieve with the reshape2 library for R. I have the following data:
...
0
votes
1answer
1k views
R: Calculations based on frequencies / grouped / aggregate data
I am trying to do simple calculations in R when no raw data but grouped data with frequencies is available only. This is the case when I have a large amount of records in a database, say a large SQL ...
26
votes
4answers
21k views
Is pandas now faster than data.table?
Here is the GitHub link to the most recent data.table benchmark.
The data.table benchmarks has not been updated since 2014. I ...
1
vote
0answers
36 views
Table function output and order of arguments
I have a silly question. Below is the output of a logistic regression analysis I did. I notice that when I switch the order of the arguments I put in the table function in R that it also switch the ...
