Regression: Definition
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Question (English)
Association between dependent and independent variables is known as:
- Correlation
- Heritability
- Regression ✓ Correct
- Repeatability
Explanation:
Correct Answer: Regression
From the notes (Table 15): Regression = measure of change in one trait (dependent variable) per unit change in another trait (independent variable). It involves a cause-and-effect relationship.
Key Differences: Correlation vs. Regression (Table 15 from notes)
| Feature | Correlation (r) | Regression (b) |
|---|---|---|
| Measures | Association/degree of relationship | Amount of change per unit change |
| Units | Unit-free (pure number) | Has units |
| Type | Relative measure | Absolute measure |
| Range | −1 to +1 | −∞ to +∞ |
| Symmetry | rxy = ryx (symmetric) | bxy ≠ byx (not symmetric) |
| Cause-effect | No | Yes |
Example (from notes)
By increasing age, systolic blood pressure also increases — this is a regression relationship (age = independent variable; blood pressure = dependent variable).
📚 About this Topic — Animal Genetics & Breeding
This multiple choice question is from Animal Genetics & Breeding, Animal Refresher. It has 4 options with a detailed explanation of the correct answer. Practice more MCQs from Animal Genetics & Breeding to strengthen your preparation.
