International Journal of Computing Science and Information Technology (IJCSIT)
Correlation Preserving Indexing is a spectral clustering method which discovers intrinsic structures embedded in high-dimensional document space. But the problem is to predict the result of one variable based on another variable is not suitable for all the situations. So, the directed Ridge regression is used which computes the relationship among the variables based on the Eigen values to identify the similarity between the documents. But in these two methods the similarity is identified by taking terms.