Search results

  1. R

    Choosing the right probability distribution

    Hi, I have different response variables of migrating birds, which I want to investigate via regression: 1.) some kind of speed (distance per hour) 2.) the ratio of restig days versus migrating days 3.) A measure for the "straightnes" of the flight, restricted between 0 and 1 (1 is a...
  2. R

    Confused with Contrasts

    Hello, during the last days, I tried to understand the use of contrasts, but the more I read, the more I am confused. As far as I understand, a contrast represents a specific hypothesis regarding the relationship between means of K levels of a factor variable. This is done via...
  3. R

    PCA (correlation) Biplot - correlation and angles

    Hi, I have a question regarding a PCA correlation Biplot. As far as I understand, angles between lines are (approx.) correlations between corresponding variables. Especially, if the angle is about 90° between two lines, these two variables are uncorrelated. But how does the plot look like if...