Quant Session 8 (3/24)

When we compare the baseline characteristics of those in the intervention group vs. those in the comparison group, we are assessing...

• Attrition threat

• Program impact

• Selection threat

When we compare the characteristics of people who completed post-intervention data collection vs. those who did not, we are assessing...

• Attrition threat

• Program impact

• Selection threat

In a quasi-experimental study, when we compare the post-intervention outcome measures of people in the intervention group vs.  comparison group, we are assessing...

• Attrition threat

• Program impact

• Selection threat

Which level of measurement is this: Categories distinguish different responses. Their order is arbitrary, as are the values/numbers associated with them.  

• Nominal

• Ordinal

• Interval/Ratio/Continuous

Which level of measurement is this: Categories are ordered, and the order represents the amount of whatever is being measured implied by each response. But, there is no mathematical statement that can be made about the magnitude of the difference between the categories. 

• Nominal

• Ordinal

• Interval/Ratio/Continuous

Which level of measurement is this: The values can be placed on a number line. The differences between the two values of an interval variable are meaningful and constant. So, the difference between 90 and 100 is the same as 10 and 20.

• Nominal

• Ordinal

• 3. Interval/Ratio/Continuous 

In the crosstab, where is the explanatory variable? 

• Row (Latino yes/no) 

• Column (the study arm) 

Based on the crosstab, which of these statements is accurate and meaningful? 

• 26.3% of the comparison group identified as Latino, compared to 73.7% in the intervention group 

• 94.6% of the comparison group identified as Latino, compared to 91.5% of those in the intervention group 

• 37% of Latino Rs were in the control group, while 63% of Latino Rs were in the intervention group 

True or False: Chi-Square generates a mean value  

• True

• False

True or False: Chi-Square assesses the overall distribution of the frequencies of two variables 

• True

• False