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🔰Concept of Correlation (Economics / Statistics)🔰

Correlation means the relationship between two variables—how one variable changes in response to a change in another.

👉 It shows direction and degree of relationship, not cause and effect.

✍🏻Definition✍🏻

Correlation is a statistical measure that shows how strongly two variables are related to each other.

🔹Types of Correlation🔹

✳️Positive Linear Correlation
✳️Negative Linear Correlation
✳️No Correlation
✳️Non-Linear Correlation

✳️Positive Linear Correlation

👉 Both variables move in the same direction.

▪️When X increases, Y also increases
▪️Points move upward from left to right

🔹Example (Economics):

Income ↑ → Consumption ↑

✳️Negative Linear Correlation

👉 Variables move in opposite directions.

▪️When X increases, Y decreases
▪️Points move downward from left to right

🔹Example (Economics):

Price ↑ → Quantity demanded ↓

✳️No Correlation

👉 No relationship between variables.

▪️Change in one variable does not affect the other
▪️Points are randomly scattered

🔹Example:
Height and intelligence

✳️Non-Linear Correlation

👉 Relationship exists but not in a straight line.
▪️Variables change, but not at a constant rate
▪️Points form a curve

🔹Example (Economics):
Stress and productivity (after a level, productivity falls)

🔰Degree of Correlation🔰

♦️Perfect correlation: +1 or –1
♦️High correlation: Close to +1 or –1
♦️Low correlation: Close to 0
♦️Zero correlation: 0

🌐Correlation Coefficient (r)🌐

✅ Value lies between –1 and +1
✅ r = +1 → Perfect positive correlation
✅ r = –1 → Perfect negative correlation
✅ r = 0 → No correlation

♻️▪️Importance of Correlation▪️♻️

🔹Helps in economic analysis
🔹Useful for forecasting
🔹Shows relationship between economic variables
🔹Helps in decision-making

♦️Limitations♦️

◼️Does not show cause and effect
◼️Only measures relationship
◼️Can be misleading sometimes

✍🏻One-Line Example for Exams✍🏻

Correlation shows the relationship between price and deman

Light travels fastest in:
A) Water
B) Glass
C) Vacuum
D) Diamond

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Which of the following is not a financial statements
A. Income statement
B. Balance sheet
C. Cash flow statement
D. Trial balance
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