SEA Blog

  • Sample Size
    When designing a study, determining the sample size is a critical decision. In order to estimate the population average from a sample of units, by means of a confidence interval at the 1-alpha level, that provides a particular precission; we can use the following formula to compute the amount of units that would be needed:… Continueu llegint Sample Size
  • Average contents: 2
    Sometimes average is not the most usefull summary statistic. To describe the location of the center of a sample of data, we usually consider the following indexes: Mean Median Depending on the type of data other indexes could be even more informative: Half point: (Max-Min)/2 Trimmed mean Geometric mean Moreover, in occasions, the location of… Continueu llegint Average contents: 2
  • Causality
    Causality does not imply correalation Correlation does not imply causality