There are often situations where we might be interested in a subset of our complete data and there are simple mechanisms for viewing and editing particular subsets of a data frame or other objects in R. Read the rest of this entry »
Working with Subsets of Data
May 8th, 2009Importing Data from other Statistical Software Packages
May 1st, 2009There are a large of number of software packages that are available for data analysts and the foreign package in R has functions defined to read data from some of the most commonly used packages that have their own proprietary data format. For other packages the user can often export data to a delimited text file which can then be handled easily by R. Read the rest of this entry »
Exporting Data from R to Text Files
April 27th, 2009Exporting small or medium sized data sets from the R environment to text files is a straightforward task. The two functions that are most useful for this operation are write.csv and write.table which export data to comma separate variable format or a text format with a different character used to indicate separate columns of data. Read the rest of this entry »
Importing Data into R from Text Files
April 25th, 2009The task of reading data into a statistical software package is not always a straight forward task and there are many varied file formats that are in use by different software systems. Text files are popular for sharing small or medium sized data sets, while full blown relational databases are more appropriate for larger data sets. The R Environment has functions that handle importing data that is stored in text format and it is also possible to interact with external database systems. Read the rest of this entry »
