Questions tagged [data.table]

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3
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1answer
147 views

Look for previous date in dataframe that has certain column category in R

I have the following data frame: ...
2
votes
1answer
25 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 ...
1
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0answers
62 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 ...
1
vote
0answers
34 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 ...
0
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0answers
17 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 ...
0
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0answers
34 views

Study resources for data manipulation interview questions

A colleague of mine is studying for tech roles, and they're asked to solve a consistent type of problem during the phone screenings: practicing manipulating data (sets, hash tables/dictionaries, ...
0
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1answer
38 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;) ...