PARALLEL GROUP DESIGNS

GROUP 2Kiarestel Lleno Isabela PrungaoCatherine Hervas

Armhel Bustamante

A research design where you apply the treatment and the control (or the two treatments) simultaneously to two separate groups of subjects. Contrast this with a crossover design where each subject gets the treatment and then the control (or the control and then the treatment) in sequence.

What is a parallel group design?

EXAMPLES OF PARALLEL

GROUP DESIGNS

• In Harris et al (1999), 990 patients newly admitted to a coronary care unit were randomly assigned to either a control group or a treatment group that received remote intercessory prayer. Both groups received the normal standard of medical care. The patients did not know which group they were assigned to, and the outcomes were measured in a blinded chart review.

Another example of parallel-group design which is applicable to education, suppose an investigator wishes to determine the effectiveness of teaching science in traditional and modern approaches.

There is only one traditional approach (control group) and two modern groups (experimental groups) in teaching Science. The ANOVA is used to determine the effectiveness in teaching Science in traditional approach and two modern approaches.

This table shows the sample of parallel-group

design in the effectiveness of teaching

Science in Traditional and Modern approaches.

Scores of SubjectsControl Group Experimental Groups Traditional Approach Modern Approaches 1 1 2

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

X X X

STATISTICS• For instance, a researcher wishes to the

acceptability of canned short-bodied mackerel (Rastrelliger brachyosomus Bleeker) in salmon style with or without seaweeds as sea vegetables. The control group is canned mackerel in salmon style without seaweeds and has two experimental groups, namely, canned mackerel with Sargassum and canned mackerel with Halymenia. All things are held constant, except the experimental group that have an addition of seaweeds and sea vegetables.

The ANOVA is used to determine the significant difference on the acceptability of canned mackerel in salmon style with or without seaweeds.

When will we use ANOVA?

ANOVA is used when your research calls for comparison of the means of two or more groups. The F test is a global test and as such one test in an analysis is done.

Panelist Control Group (without seaweeds)

Experimental Groups (withSargassum Seaweeds Halymenia)

1 X X X

2 X X X

3 X X X

4 X X X

5 X X X

6 X X X

7 X X X

8 X X X

9 X X X

10 X X X

Canned Mackerel R. brachyosomus

Therefore Parallel group design is a design in which two or more groups are used at the same time.

This design has a control group, parallel group and experimental group.

CONTROL GROUP- manipulated for change.

EXPERIMENTAL GROUP- this is the group that varies.

Parallel Group-Serves as control for comparative purposes.

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