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📈Test normality in R📉
To test normality in R, you can use both statistical tests and visual methods. I’ll show you the most common and reliable ones step by step.
1️⃣ Shapiro-Wilk Test (Most commonly used)
Best for small to medium samples (n < 5000).
Syntax:
shapiro.test(your_data)
Example:
data <- c(160, 162, 165, 170, 168, 164, 163)
shapiro.test(data)
Interpretation:
p > 0.05 → Data is normally distributed
p ≤ 0.05 → Data is NOT normal
2️⃣ Kolmogorov-Smirnov Test (KS test)
Used for large samples, but less powerful for normality.
Syntax:
ks.test(your_data, "pnorm", mean(your_data), sd(your_data))
Example:
ks.test(data, "pnorm", mean(data), sd(data))
3️⃣ Anderson-Darling Test (Very powerful)
You need to install a package.
Install & run:
install.packages("nortest")
library(nortest)
ad.test(data)
4️⃣ Visual Methods (Highly Recommended)
A) Histogram
hist(data, breaks = 10, col = "skyblue", main = "Histogram")
B) Q-Q Plot (Very important)
qqnorm(data)
qqline(data, col = "red")
If points follow the straight line → data is normal.
5️⃣ Best Practice
Always use: ✅ Shapiro-Wilk test
✅ Q-Q plot
✅ Histogram
Together for correct decision.
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No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
Repost from NEVER GIVE UP💪
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⭐ Rate godhi | 🔁 Hiriyoota kee waliin qoodi
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No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
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Check out "Hamid Mude's Oromo Dictionary"
https://play.google.com/store/apps/details?id=com.savana.profdictionary
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
No one ever told me this: depending on others is the fastest way to lose everything. I learned it by failing—again and again.
But there’s a way to break the cycle. Want to know the rule everyone ignores?
👉 Find out here
#ad InsideAds Free Subscribers
