Identify two types of variables and four scales of measurement.
How they are related with each other? What is the difference
between variables and constants? Why do we need to study variables
instead of constants in statistics? (Business Statistics &
Application Course)
Which dimension reduction method (Network multidimensional
scaling, Multidimensional scaling or Optimized multidimensional
scaling) should be chosen to study outliers in the lower
dimensional embedding? Why?