Building models using split date

@shaw38 wrote:

Hi everyone! I'm new to Data Science and this community.
I have metrics(say, Lines of Code), concerning a project that lasted for 15 years=Jan 2000-Oct 2015. I also have a 'date' column in the format YYYY-MM-DD. How do I build the testing and training data set (TATDS, for brevity ) in R , using:
i) 50:50 ratio ,i.e divide into TATDS, using exactly the middle of the split date, about 7.5 years since the start
ii) 80:20 ratio , i.e the testing and training data should comprise the 1st 80% and last 20% of the data respectively.
Your help is much appreciated!!
Thank you..

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