Berk U.

Cambridge, MA

berkustun.com

Age: 27

I am a Ph.D. student in the Electrical Engineering and Computer Science Department at MIT. I am interested in developing new methods for data-driven decision-making and using them to solve problems in areas such as climate change, crime prediction, healthcare and revenue management.

12h
comment When wouldn't I use LASSO for model selection?
Thanks for this answer. Do you know any papers that discuss the issues with correlated predictors / categorical predictors?
12h
revised What are the disadvantages of using the Lasso for feature selection in classification (in comparison to a brute force)?
added 18 characters in body
19h
accepted How to validate a lognormal random walk for time series data
19h
asked What are the disadvantages of using the Lasso for feature selection in classification (in comparison to a brute force)?
Feb
17
awarded Popular Question
Feb
13
awarded Popular Question
Feb
7
awarded Popular Question
Feb
2
awarded Notable Question
Jan
30
awarded Popular Question
Jan
8
awarded Yearling
Jan
5
comment Summarizing an arbitrary # of columns in a data frame using my own function in R
Quick question: is a data.table solution faster than dplyr? I've seen it mentioned several times in these forums.
Jan
5
comment Summarizing an arbitrary # of columns in a data frame using my own function in R
Yes! This is very close to what I was looking for. The only thing is that this automatically appends the summarized field names with an underscore + the function name. Is there some way to make it use a "." instead of a "_" (e.g. value_1.min instead of value_1_min)?
Jan
4
asked Summarizing an arbitrary # of columns in a data frame using my own function in R
Dec
22
revised How to change color/shape/size for a subset of data after plotting in ggplot2
added 237 characters in body; edited title
Dec
21
asked How to change color/shape/size for a subset of data after plotting in ggplot2
Dec
20
accepted How to set the default value of a variable as an array?
Dec
20
comment How to set the default value of a variable as an array?
Thanks! It works great!
Dec
20
comment Robust function to set the default value of scalar / array variables
This looks promising. Unfortunately, I actually get a 'mapfile: command not found' error (running GNU bash, version 3.2.53(1)-release (x86_64-apple-darwin14)).
Dec
20
comment Capture job id of a job submitted by qsub
Could you explain what is going on here? Wouldn't the $(qsub job.sh) resubmit a job to the scheduler?
Dec
18
asked Robust function to set the default value of scalar / array variables
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