如何计算Descriptive Statistics

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Descriptive statistics summarize and describe the key features of a dataset: central tendency (mean, median, mode), spread (range, variance, standard deviation), and shape (skewness, kurtosis). They condense large datasets into interpretable summaries.

分步指南

1. 1Mean: sum of all values / count
2. 2Median: middle value when sorted (average of two middle values if even count)
3. 3Standard deviation: √(average squared deviation from mean)
4. 4Quartiles: Q1 (25th percentile), Q2 (median, 50th), Q3 (75th)

例题解析