aggregate

Examples of aggregate in the following topics:

• Ecological Fallacy

  • Then, even if at the individual level there is negative correlation between suicidal tendencies and Protestantism, there can be a positive correlation at the aggregate level.
  • Running regressions on aggregate data is not unacceptable if one is interested in the aggregate model.
  • Choosing to run aggregate or individual regressions to understand aggregate impacts on some policy depends on the following trade off: aggregate regressions lose individual level data but individual regressions add strong modeling assumptions.
  • Discuss ecological fallacy in terms of aggregate versus individual inference and give specific examples of its occurrence.

• Sex Bias in Graduate Admissions

  • Examination of the aggregate data on admissions showed a blatant, if easily misunderstood, pattern of gender discrimination against applicants.
  • Simpson's Paradox is a paradox in which a trend that appears in different groups of data disappears when these groups are combined, and the reverse trend appears for the aggregate data.
  • The practical significance of Simpson's paradox surfaces in decision making situations where it poses the following dilemma: Which data should we consult in choosing an action, the aggregated or the partitioned?
  • The answer seems to be that one should sometimes follow the partitioned and sometimes the aggregated data, depending on the story behind the data; with each story dictating its own choice.

• Computing R.M.S. Error

  • Root-mean-square error serves to aggregate the magnitudes of the errors in predictions for various times into a single measure of predictive power.

• Comparing Nested Models

  • The units of analysis are usually individuals (at a lower level) who are nested within contextual/aggregate units (at a higher level).

• Chance Models

  • Stochastic models can be simulated to assess the percentiles of the aggregated distributions.