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G. Grothendieck
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GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
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319
Extract a substring according to a pattern
Jun 20, 2013
291
Can dplyr package be used for conditional mutating?
Jun 27, 2014
237
Filter for complete cases in data.frame using dplyr (case-wise deletion)
Mar 12, 2014
230
promise already under evaluation: recursive default argument reference or earlier problems?
Dec 5, 2010
227
What does %>% function mean in R?
Nov 25, 2014
223
How to assign from a function which returns more than one value?
Feb 28, 2013
151
dplyr mutate with conditional values
Mar 11, 2014
151
How to divide each row of a matrix by elements of a vector in R
Dec 15, 2013
127
How to subtract months from a date in R?
Mar 7, 2011
125
Collapse / concatenate / aggregate a column to a single comma separated string within each group
Apr 10, 2013
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18
How to use DLM with Kalman filtering for forecasting
17
Measuring Standard Error of two or more coefficients combined
8
Why do we say the outcome variable "is regressed on" the predictor(s)?
8
Random Effects Design Matrix
7
Interpreting and troubleshooting nls in R with quadratic plateau model