Why should we care about string manipulation?
/////////////////////////////////////////

 String manipulating is very import part of data manipulation. 

  1) A true data variable
 
  2) make our program simple
     Assume that we have SEC index from 1993 to 2019

  3) Many different input names

  4) others
  
/////////////////////////////////////////

Simple data manipulations
////////////////////////////////
 Malakar,Gopal,2017, How to Merge Data Sets (join) in R
     (v20k,s7k,t3:04)
     https://www.youtube.com/watch?v=RNmgnVvcfU4

 GordonAnthonyDavis,R Programming Tutorial Lesson 16: Merging Data Frames
     (v35k,s4k,t7:03)
     https://www.youtube.com/watch?v=rkmIASiE8iI
///////////////////////////////

Data output 
////////////////////////////////
 Brown, Jonathan,2016,Interpreting R Output For Simple Linear Regression Part 1 (EPSY 5262)
    (v452,s428k,t13:00)
    https://www.youtube.com/watch?v=u7TxjUI4PRI

 Chan, Phil,2012,Statistics with R: How to redirect textual output to a file in R using sink()
    (v9k,s28k,t2:57)
    https://www.youtube.com/watch?v=4GzCtx5XMNE

 Gotwals,Bob,2015, Exporting R Results
    (v40k,s428k,t3:56)
    https://www.youtube.com/watch?v=iZLCWJg0A44
////////////////////////////////

Neural network 
////////////////////////////////

But what is a neural network? | Chapter 1, Deep learning
  (t18:39)
   https://www.youtube.com/watch?v=aircAruvnKk

IBM Technology, 2022, Neural Networks Explained in 5 minutes
   (t4:31,v118k,s916k)
   https://www.youtube.com/watch?v=jmmW0F0biz0

Simplilearn,2020,Neural Network In 5 Minutes
   (t5:44,v1.1m,s3.58m)
   https://www.youtube.com/watch?v=bfmFfD2RIcg

Simplilearn,2022, Neural Network Full Course 
   (t8:14:30)
   https://www.youtube.com/watch?v=KiW-W4v0nBo
////////////////////////////////

R installation and basics 
////////////////////////////////
 How to download and install R (6m39s) [for Windows)
      https://www.videoP.com/watch?v=ZoPJGmpYJzw

 Programming in R - Getting Started - Installing R and RStudio on a Mac (5m59s)
      https://www.videoP.com/watch?v=Ywj6yNfc5nM

 Yan, Yuxing, 2022, DANL100 Chapter 1: R basics
    https://www.youtube.com/watch?v=xP6PTpcuciU
////////////////////////////////