by admin | Nov 22, 2015 | Data analysis - basics

basic correlation – “cor” command correlation diagram – “corrgram” command from library corrgram covariance – “cov” command Pearson correlation polychoric correlation
by admin | Nov 22, 2015 | Data analysis - basics

We use different technics to estimate future value of some variable based on other variables and relationships between them. simple regression – relationship between two variables in R: “cor” to check how strong reg. is, “lm” to test...
by admin | Nov 21, 2015 | Data analysis - basics

If you need to say in very scientifically looking way to someone who is not familiar with theory of statistics and analysis that you have no idea about some problem a you must just try – then you can use these nice words “heuristic analysis”....
by admin | Nov 18, 2015 | Data analysis - basics

Named by Italian Economist Vilfredo Pareto. This analysis is also called 20/80 rule or Pareto Principle. Basically we calculate how big part of first variable contributes to 80% of second variable. Or more easily in this example – how big percentage of customers...
by admin | Nov 18, 2015 | Data analysis - basics

Shows us number of occurrences / events that happend. Usually we need to group data in some classes to show frequency. Of course we can use different granularities for these classes / groups and get this way general or detailed results. Therefore very useful in this...
by admin | Nov 18, 2015 | Data analysis - basics

Simplest ranking analysis is just sorting of the data in order we want. This can look a little bit like a joke but ranking analysis is actually important tool. All well known “Top X” lists are examples of ranking analysis. we can simply sort data by some...