Solved

Comparing values between more than 2 datasets in R

Posted on 2014-04-25
2
208 Views
Last Modified: 2014-05-01
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
Comment
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
  • Learn & ask questions
2 Comments
 
LVL 1

Accepted Solution

by:
Chelsea Obrochta earned 500 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

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

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
method argument as final 1 115
factory design pattern vs abstract factoy design pattern 2 122
numbers ascending pyramid 101 241
Problem to refer to value 8 82
This article is meant to give a basic understanding of how to use R Sweave as a way to merge LaTeX and R code seamlessly into one presentable document.
Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
The viewer will learn how to pass data into a function in C++. This is one step further in using functions. Instead of only printing text onto the console, the function will be able to perform calculations with argumentents given by the user.
The viewer will learn how to clear a vector as well as how to detect empty vectors in C++.

726 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question