Menarik kesimpulan dari sampel

Anda telah melihat bagaimana pengambilan sampel acak dapat digunakan untuk memilih sampel data yang (semoga!) mewakili populasi yang Anda teliti. Anda juga telah melihat bagaimana bias dalam prosedur pengambilan sampel dapat menghasilkan kesimpulan yang paling baik diragukan, dan paling buruk sama sekali keliru.

Dalam latihan ini Anda akan menganalisis harga penutupan rata-rata S&P 500. Jika Anda mengambil dua sampel hari perdagangan yang berbeda dan menghitung interval kepercayaan untuk masing-masing, haruskah Anda berharap mendapatkan hasil yang sama? Saatnya Anda menyelami dan mencari tahu!

Latihan ini adalah bagian dari kursus

Dasar-dasar Inferensi di Python

Latihan interaktif praktis

Cobalah latihan ini dengan menyelesaikan kode contoh berikut.

# Sample 1: Select a random sample of 500 rows
sample_df = ____.sample(n=____)

# Compute a 95% confidence interval for the closing price of SP500
sample_ci = stats.____.____(alpha=____, 
                            loc=____.mean(), 
                            scale=____.std()/np.sqrt(____))

print(sample_ci)

Edit dan Jalankan Kode

Latihan ini adalah bagian dari kursus

Dasar-dasar Inferensi di Python

SkillTag.level.advancedSkillTag.label

4.9+

Mulai Kursus Gratis

In this chapter, we'll explore the relationship between samples and statistically justifiable conclusions. Choosing a sample is the basis of making sound statistical decisions, and we’ll explore how the choice of a sample affects the outcome of your inference.

Exercise 1: Inferensi statistik dan pengambilan sampel acak Exercise 2: Sampling dan estimasi titik Exercise 3: Pengambilan sampel berulang, estimasi titik, dan inferensi Exercise 4: Pengambilan Sampel dan Bias Exercise 5: Memvisualisasikan sampel Exercise 6: Inferensi dan bias Exercise 7: Interval kepercayaan dan pengambilan sampel Exercise 8: Distribusi sampling normal Exercise 9: Menghitung interval kepercayaan Exercise 10: Menarik kesimpulan dari sampel

Latihan Saat Ini

Learn all about applying normality tests, correlation tests, and parametric and non-parametric tests for sound inference. Hypothesis tests are tools, and choosing the right tool for the job is critical for statistical decision-making. While you may be familiar with some of these tests in introductory courses, you'll go deeper to enhance your inferential toolkit in this chapter.

Exercise 1: Normality tests Exercise 2: Testing for normality Exercise 3: Distribution of errors Exercise 4: Fitting a normal distribution Exercise 5: Correlation tests Exercise 6: Testing for correlation Exercise 7: Autocorrelation Exercise 8: Explained variance Exercise 9: Parametric tests Exercise 10: Equal variance Exercise 11: Normality of groups Exercise 12: ANOVA Exercise 13: Non-parametric tests Exercise 14: Comparing rankings Exercise 15: Comparing medians

In this chapter, you'll measure and interpret effect size in various situations, encounter the multiple comparisons problem, and explore the power of a test in depth. While p-values tell you if a significant effect is present, they don't tell you how strong that effect is. Effect size measures how strong an effect a treatment has. Master the factors underpinning effect size in this chapter.

Exercise 1: Effect size Exercise 2: Effect size for means Exercise 3: Effect size for correlations Exercise 4: Effect size for categorical variables Exercise 5: Multiple comparisons and corrections Exercise 6: Multiple comparisons problem Exercise 7: Bonferonni-Holm correction Exercise 8: Power of a test Exercise 9: What is power anyway?Exercise 10: Power for experimental design Exercise 11: Computing power and sample sizes

You’ll expand your inferential statistics toolkit further with a look at bootstrapping, permutation tests, and methods of combining evidence from p-values. Bootstrapping will provide you with a first look at statistical simulation. In the lesson meta-analysis, you’ll learn all about combining results from multiple studies. You’ll end with a look at permutation tests, a powerful and flexible non-parametric statistical tool.

Exercise 1: Bootstrapping Exercise 2: Bootstrap confidence intervals Exercise 3: Bootstrapping vs. normality Exercise 4: Combining evidence from p-values Exercise 5: Fisher's method in SciPy Exercise 6: Inference using Fisher's method Exercise 7: Summarizing Fisher's method Exercise 8: Permutation tests Exercise 9: Permutation tests for correlations Exercise 10: Permutation tests and bootstrapping Exercise 11: Analyzing skewed data with a permutation test Exercise 12: Course wrap-up video