biostatistics

  1. D

    a simple question

    Hi, As you can tell I am statistically challenged. Suppose x and y are continuous, independent variables that represent traits of the N subjects of sample S, and that x and y, and therefore x+y, are measured in identical units. Knowing the mean and standard deviation for x in S, and the...
  2. N

    Significance test for differences in baseline and re measurement rates

    Hi, I need help in knowing which test to perform with this analysis. I have two groups (lets say group A and B). A study was performed with initial rates of heart failures in group A and B (i.e, baseline rates) were measured. After 6 months of follow up the heart failure rates in group A and...
  3. O

    How can data bellow the lower limit of detection be included in statistical analysis?

    How can data below the lower limit of detection be included in statistical analysis? My assay has a lower limit of detection of 10. How do I include data below this point in my analysis? Should I enter them as 10 or 0 or is it not possible to enter these values? I am only calculating...
  4. J

    Homogenity in mulitivariate data

    Dear all, I have the following problem. There is a multivariate data set, around hundred samples and almost five hundred variables. The samples belong to two groups, and several variables show significant differences between the two groups. The samples are biological and belong to one...