reshape longitudinal data wide to long
33457
Reshaping data.frame from wide to long format
10256
Principled way of collapsing categorical variables with many levels?
6158
How to resample in R without repeating permutations?
89743
Split data.frame based on levels of a factor into new data.frames
112754
Create grouping variable for consecutive sequences and split vector
152118
Solve the recurrent relation
38881
evenly spreading data in to multiple columns
3989
Preprocess categorical variables with many values
103905
Expand grid with unknown dimension in R
84565
How to select a subset of variables from my original long list in order to perform logistic regression analysis?
17635
How to create an arbitrary covariance matrix
9166
Multidimensional Interpolation with 3 independent Variables with modfied data set
15444
Linear Regression with individual constraints in R
37244
How to smooth data and force monotonicity
81583
Request for reference for longitudinal data analysis which is mathematically well-written
69637
Random Forests and data transformations
154939
How can I handle autocorrelated residuals?