Questions about subset
Read more about subset
python (12.9k questions)
javascript (9.2k questions)
reactjs (4.7k questions)
java (4.2k questions)
java (4.2k questions)
c# (3.5k questions)
c# (3.5k questions)
html (3.3k questions)
Efficient methods for determining the largest set of complete data in a large dataset
I have a large-ish dataset (say 10mil rows by 1500 columns). Each row represents an individual and each column represents a question. I would like to find the largest set of non-missing data (i.e., n ...
TeresaStat
Votes: 0
Answers: 0
How to sum over subsets of rows in R
I'm using R to work with the US county-level voting data that the good folks at MIT steward. I'd like to know the total votes each candidate got in each county. For some states, such as Wisconsin, tha...
eBerm
Votes: 0
Answers: 1
Extract the first and last observation of each group, every time that group appears within a large dataset?
I have a large dataset (~300,000 rows) of fish detections. Each detection has a date, a station (location), and a tagID, among many other variables like temperature, depth, etc. I want to pull out the...
Aimee Taylor
Votes: 0
Answers: 2
Is there a way to isolate multiple index points in a dataset and isolate a time window around that index point in R?
I have a dataset with patients who were under observation for 72 hours. Patient's oxygen levels were measured every 4 seconds but some observations had to be removed due to issues with accuracy of the...
msiddiqui
Votes: 0
Answers: 1