descriptive statistics

  1. L

    Descriptive Summations

    How would I go about solving this? 1/nΣxi^2=100 and 1/nΣxi=2. Define yi=2xi+1 and find 1/nΣyi^2.
  2. P

    Creating new variable?

    I think what I need to do is create/compute a new variable, but I'm not sure. I'm looking at incidence of cavities in teeth. The way I collected the data is by individual tooth were 0 = no cavities, 1 = one cavity, 2 = one or more cavity in the tooth. But now I want to look at the incidence...
  3. R

    Discussing a model design

    I am a software developer and like stats but no professional so I would like your opinon on how to build a concrete statistical model the goal is to understand what are the most eaten foods in Austria I would like to know what you think of my approach: I go to a supermarket and observe the...