Data Science & Machine Learning
Join this channel to learn data science, artificial intelligence and machine learning with funny quizzes, interesting projects and amazing resources for free For collaborations: @love_data
Ko'proq ko'rsatish📈 Telegram kanali Data Science & Machine Learning analitikasi
Data Science & Machine Learning (@datasciencefun) Ingliz til segmentidagi kanali faol ishtirokchi. Hozirda hamjamiyat 77 425 obunachidan iborat bo'lib, Taʼlim toifasida 1 982-o'rinni va Hindiston mintaqasida 3 909-o'rinni egallagan.
📊 Auditoriya ko‘rsatkichlari va dinamika
невідомо sanasidan buyon loyiha tez o‘sib, 77 425 obunachiga ega bo‘ldi.
14 Sentabr, 2026 dagi oxirgi ma’lumotlarga ko‘ra kanal barqaror faollikka ega. Oxirgi 30 kunda obunachilar soni 254 ga, so‘nggi 24 soatda esa 31 ga o‘zgardi va umumiy qamrov yuqori darajada qolmoqda.
- Tasdiqlash holati: Tasdiqlanmagan
- Jalb etish (ER): Auditoriya o‘rtacha 2.43% darajada jalb etiladi. Nashrdan keyingi dastlabki 24 soatda kontent odatda umumiy obunachilar sonining 1.00% ini tashkil etuvchi reaksiyalarni to‘playdi.
- Post qamrovi: Har bir post o‘rtacha 1 879 marta ko‘riladi; birinchi sutkada odatda 775 ta ko‘rish yig‘iladi.
- Reaksiyalar va o‘zaro ta’sir: Auditoriya faol: har bir postga o‘rtacha 3 ta reaksiya keladi.
- Tematik yo‘nalishlar: Kontent learning, accuracy, distribution, panda, dataset kabi asosiy mavzularga jamlangan.
📝 Tavsif va kontent siyosati
Muallif resursni shaxsiy fikrni ifoda etish maydoni sifatida ta’riflaydi:
“Join this channel to learn data science, artificial intelligence and machine learning with funny quizzes, interesting projects and amazing resources for free
For collaborations: @love_data”
Yuqori yangilanish chastotasi (oxirgi ma’lumot 15 Sentabr, 2026 da olingan) sababli kanal doimo dolzarb va katta qamrovli bo‘lib qoladi. Analitika auditoriya kontent bilan faol hamkorlik qilishini, uni Taʼlim toifasidagi muhim ta’sir nuqtasiga aylantirishini ko‘rsatadi.
Statistical estimation is the process of using sample data to estimate unknown population parameters. A point estimator provides a single estimate, while interval estimation provides a range that reflects uncertainty. Good estimators are often evaluated using properties such as bias, variance, consistency, and efficiency.💡 What is the bias-variance tradeoff?
Bias represents systematic error, while variance represents sensitivity to different samples. In Machine Learning, high bias can lead to underfitting, while high variance can lead to overfitting.🎯 Key Takeaways ✅ Statistical estimation uses sample data to estimate unknown population parameters. ✅ Parameter → Population ✅ Statistic → Sample ✅ Estimator → Method ✅ Estimate → Result ✅ Point estimation → Single value ✅ Interval estimation → Range ✅ Bias → Systematic error ✅ Variance → Variability across samples ✅ Consistency → Estimate approaches the true parameter as sample size increases ✅ Efficiency → Lower variance among comparable estimators ✅ MSE = Variance + Bias² ✅ High Bias → Underfitting ✅ High Variance → Overfitting 🎯 Double Tap ❤️ For More ----- 1.38 ₽ · /balance_help
import numpy as np
data = np.array([2400, 2600, 2500, 2700, 2300])
point_estimate = np.mean(data)
print("Point Estimate:", point_estimate)As the number of observations increases, the sample average tends to get closer to the true population average, provided the observations satisfy appropriate conditions.This is why collecting more representative data makes estimates more reliable. 🔹 1. What Is LLN? P(Heads) = 0.5 for a fair coin • 10 tosses: 7 Heads → 7/10 = 0.70 • 100 tosses: 54 Heads → 54/100 = 0.54 • 10,000 tosses: Proportion → ∼0.50 More trials → observed average approaches expected value. 🔹 2. Simple Example True avg weight = 70 kg • Sample 5 → 74 kg • Sample 50 → 71 kg • Sample 500 → 70.3 kg • Sample 5,000 → 70.05 kg 🔹 3. LLN Does NOT Mean Perfect LLN does NOT mean every large sample = exact population mean. It means convergence, not guaranteed equality. Mean might be 99.8 instead of 100, but close. 🔹 4. LLN and Probability If P(Success) = 0.20 • 10 trials → 30% observed • Many trials → tends to 20% 🔹 5. Two Main Versions 1) Weak LLN: Sample average converges in probability. The probability of being far from true mean becomes very small. 2) Strong LLN: Sample average converges almost surely, with probability 1. For Data Science, focus on the core idea. 🔹 6. LLN vs CLT - Very Important LLN → Accuracy Where does sample mean go? → Toward population mean μ. CLT → Distribution What does distribution of sample means look like? → Approximately Normal. 🔹 7. Casino & Gambler's Fallacy LLN does NOT mean: "If you lost, you must win next." After H,H,H,H,H → P(Tails) next is still 0.5. LLN is about long-run averages, not next trial. 🔹 8. LLN in Data Science • Averages: Avg revenue, spending, delivery time - more data = more stable • Conversion Rate: 10 visitors → 20% is noisy. 100,000 visitors → stable • A/B Testing: Needs adequate sample size • ML: Tiny eval sets = unstable metrics. Larger sets = reliable 🔹 9. LLN Does NOT Fix Bias
More data is NOT automatically better data.If you survey only an expensive private club to estimate city income, even 1M samples = biased. Large + Biased = Biased Estimate Large + Representative = Reliable 🔹 10. Python Demo
import numpy as np
import matplotlib.pyplot as plt
np.random.seed(42)
tosses = np.random.choice([0, 1], size=10000)
running_average = np.cumsum(tosses) / np.arange(1, len(tosses) + 1)
plt.plot(running_average)
plt.axhline(0.5, linestyle="--")
plt.xlabel("Number of Tosses")
plt.ylabel("Proportion of Heads")
plt.title("Law of Large Numbers")
plt.show()
🔹 11. Common Mistakes
❌ Large sample = exact value → No, it tends toward it
❌ LLN guarantees next outcome → No, long-run only
❌ More data removes bias → No
❌ LLN = CLT → No
❌ Small samples useless → No, just more uncertain
🔹 12. Interview Answer
The Law of Large Numbers states that, under suitable conditions, as independent observations increase, the sample average converges toward the population expected value. It explains why larger representative samples give more stable estimates.🎯 Key Takeaways ✅ LLN = long-run convergence of average to E ✅ More representative obs = more stable ✅ Does not predict next outcome ✅ Does not remove bias - representativeness matters ✅ LLN → Convergence, CLT → Normality[X] 🎯 Double Tap ❤️ For More ----- 1.46 ₽ · /balance_help
