Vlookup in R
Join functions can do the trick, but needed some modifications.
Month: September 2017
AirBNB
This is the second installment in the Company Reviews Series.
Cross-Validation: k-Folds
k-folds
Cross-Validation: LOOCV
We will cover how to use Leave-One-Out-Cross-Validation (LOOCV.)
Model Selection: Forward, Backward Selection
Too many features? Let Forward and Backward selection assist you
Extracting Only Even/Odd Rows/Columns
There is an easier way than specifying column/row indexes.
Model Selection: Best Subset Selection
Although fitting all features in a data set may not always be a preferred method, it would not hurt to know how to do.
Adding Leading and Trailing Character/Whitespace
Removing leading and trailing is common. But what if you want to add leading and trailing whitespace or a character?
Locating NAs
A couple of ways to find where NAs are.
Removing Trailing & Leading Whitespace
Removing unwanted leading, trailing, or both whitespace.