aggregate data

  1. J

    Data not Aggregating Appropiately

    Hello, I am working on my capstone entitled "Association of Availability of Quality Early Care and Learning Centers and Childhood Obesity in Philadelphia, PA" I am measuring the quality of QECLCs in three ways: (1) the number of total QECLCs, (2) the proportion of QECLCs out of all ECLCs, and...
  2. M

    Add syntax to Aggregation command

    Example: I have 2 identical student records except for string variable of Teacher last name (Tlname) - say Smith and Jones. Is there a way to add syntax to the AGG command so that I create one student record that will concatenate the string variables of TLNAME and end up with something like...
  3. B

    Aggregate precision of a measurement instrument based on a sample of measurements whose true errors are known

    I want to estimate the accuracy and precision of aggregate data from an instrument that measures a variable that fluctuates over time by comparing a sample of its measurements to concurrent measurements made by a reference instrument. For this purpose, assume that the reference instrument...
  4. E

    ttest for comparison of group means from pooled samples

    Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical level taken for control and experimental pooled sample. How would I calculate the significance of difference between these measurements, where I only...