identifying study designs
CHAPTER 7 NOTES
Cross-Sectional Study Design- a study design in which data are collected for all the variables of interest using one sample at one time. They can have more then one independent variable in a sample
Spurious relationship- by the action of some third variable, sometimes called antecedent variable, that comes before, and is actually responsible for, making the independent variable and the dependent variable vary together.
Longitudinal Designs: Are search design in which data are collected at least two different times, such as a panel, trends, or cohort study.
Panel study-a design that follows one sample at least two times where the independent variable is not controlled by the researcher.
The elements( people) used in the beginning of the study are the same ones through out the panel study.
Panel attrition-the loss of subjects from a study because of disinterest, death, illness, or inability to locate them.
Trend study-a study design in which data are collected at least two times with a new sample selected from a population each time.
Selecting new samples for longitudinal studies can be very useful when researchers are interested in identifying changes over time in large populations, such as registered voters in one country or college students around the world.
Cohort study- is a longitudinal study that follows a cohort over time. In social science research, a cohort is a group of people who have experienced the same significant life event at the same time.
The same population is followed at least two times using either a panel or a trend study design.
