@chakravarty wrote:
Hi,
I have a couple of basic questions. I am bit familiar with R.
1.)what is multicollinearity?How do i check if there exists any multi collinearity among the attributes?Is it a good thing to have among attributes or is it a curse? Any functions/packages pertaining to check it in R?
2.)Could you explain the difference between sparse data and dense data? My understanding is this:
dim(x1) ##1000 550 I think it is sparse data as we have many columns
dim(x2) ##4000 40 I think it is dense data as we have many rows
I may be terribly wrong in my understanding please correct me.
3.)say i have 10 attributes in my dataset i look at the str(data) and do the necessary data type conversion. What if i have 100 or 300 attributes do i need to manually change the data type by looking at each of them. Is there any R command or small code snippet to automate it.
Sorry if these questions are too naive.
Thanks
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