Embedded Files
QUASI EXPERIMENTAL
QUASI EXPERIMENTAL
Quasi Experiemental Studies have:
No random assignment of participants to groups (e.g., not ethical to withhold a potentially beneficial program from some participants).
Pre-Test Post-Test Design
Pre-Test Post-Test Design
A pre-test post-test design involves measuring a variable (dependent variable) before and after an intervention (independent variable). This design allows researchers to assess whether the intervention caused a change in the variable.
Controlled Trials
Controlled Trials
Controlled trials are experiments that aim to isolate the effect of an intervention by comparing a treatment group (receiving the intervention) with a control group (not receiving the intervention). Random assignment of participants to groups is a key feature of controlled trials.
Recap - Identifying a study by its type:
Recap - Identifying a study by its type:
When reading research articles, there are some key characteristics and clues that can help identify different study types. Here are some general tips to recognize common study types:
1. Randomized Controlled Trial (RCT):
- Look for mention of random assignment of participants into intervention and control groups.
- Typically involves a comparison of at least two groups (e.g., experimental group and control group).
- May include descriptions of blinding/masking procedures.
- Often reports outcomes in terms of statistical significance and p-values.
2. Cohort Study:
- Look for descriptions of a group of participants followed over time.
- May involve exposure assessment and tracking the occurrence of outcomes.
- Data is collected prospectively (forward in time) or retrospectively (backward in time).
- Typically reports relative risks, hazard ratios, or incidence rates.
3. Case-Control Study:
- Look for a study design that compares individuals with a particular outcome (cases) to those without the outcome (controls).
- Often involves retrospective collection of exposure information.
- Typically reports odds ratios or measures of association between exposures and outcomes.
4. Cross-Sectional Study:
- Look for a study design that assesses exposure and outcome simultaneously at a single point in time.
- Often involves survey questionnaires or interviews.
- Typically reports prevalence rates and associations between exposures and outcomes.
5. Case Series/Case Study:
- Look for descriptions of a small group of individuals with similar characteristics or conditions.
- Involves detailed descriptions of individual cases, their symptoms, treatments, and outcomes.
- Typically lacks comparison groups or control groups.
- Primarily aims to present descriptive information rather than statistical analyses.
Remember, these tips are general guidelines, and study designs can vary in their specific characteristics. It's also important to read the methods and results sections carefully to get a clear understanding of the study design and its findings.
SELF DIRECTED STUDY Now test your ability here.
Page updated
Google Sites
Report abuse