Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
Solved

# Comparing values between more than 2 datasets in R

Posted on 2014-04-25
Medium Priority
226 Views
Hello,

I am relatively new to R. I am amazed by how much stuff I can get done with it. Right now I am doing a project. I have a three data sets that contain the returns of the entire stocks in the S&P 500, Ranks of the book to market value of these stocks and ranks of the market capitalization of these stocks. I have divided my book to market ranks into 'top', 'bottom','middle' where 'top' represents the top 30%, 'bottom' represents the low 30% and 'middle' represents the middle 40%. The ranks of the market capitalization are divided into 'small' and 'big'.

I have to create 3 portfolios that have an intersection of 'small' and 'bottom' and then find those stocks in the return matrix. 'small' and 'top' and find the stocks in the return matrix. 'small' and 'middle' and find the stocks in the return matrix. I have to go row by row since the values of these stocks keep changing every month. So for example if one stock is 'top' one month it might be 'middle' the next month same goes for my 'small' and 'big' matrix. I have tried using the %in% function but is there a better way that I can do this without losing myself into messy code. Your help is greatly appreciated.

Thank you,
Abhishek
0
Question by:anajbile
[X]
###### Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points

LVL 1

Accepted Solution

Chelsea Obrochta earned 1500 total points
ID: 40023370
Hi!

You can use the merge function. For example lets say your file is named stock. Your variable are rank2(for big and small) and rank3(for top, middle, and bottom). You then do:

merge(stock[rank2== "small",], stock[rank3== "top",])

This would give you a list of all stocks in small and top.

I hope this Helps! Let me know :)
Chelsea
0

Author Comment

ID: 40035342
Hi Chelsea, Thank for the solution. I found that intersect function works as well.
0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

How to remove superseded packages in windows w60 or w61 installation media (.wim) or online system to prevent unnecessary space. w60 means Windows Vista or Windows Server 2008. w61 means Windows 7 or Windows Server 2008 R2. There are various …
Having just graduated from college and entered the workforce, I don’t find myself always using the tools and programs I grew accustomed to over the past four years. However, there is one program I continually find myself reverting back to…R.   So …
The viewer will be introduced to the technique of using vectors in C++. The video will cover how to define a vector, store values in the vector and retrieve data from the values stored in the vector.
In a recent question (https://www.experts-exchange.com/questions/29004105/Run-AutoHotkey-script-directly-from-Notepad.html) here at Experts Exchange, a member asked how to run an AutoHotkey script (.AHK) directly from Notepad++ (aka NPP). This video…
###### Suggested Courses
Course of the Month8 days, 7 hours left to enroll