StatisticsLesson 52Free preview
Descriptive
This lesson is part of A.I. · All levels
Summary
Descriptive statistics summarize the data into a few concise numbers: mean (average), median (middle value), and mode (value most frequently occurring). All three give a quick overview of the center and characteristics of a dataset. These numbers are often the first step of analysis before building a model.
Key points
- The mean is the sum of all values divided by the number of elements.
- The median is the mean after the data is sorted.
- Fashion is the most frequently-appearing value.
- Means sensitive to outliers, medians more resistant.
- The three are used together to describe the entire data center.
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