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Data aggregation involves summarizing and condensing data into a more manageable and insightful form. Here are some common examples of data aggregation:
1. Summation:
- Adding up numerical values to calculate totals, such as total sales for a specific period or the sum of scores in a test.
- It is a fundamental operation in data aggregation, often used to obtain a consolidated view of data.
- Summation can be sensitive to outliers, so it’s essential to review the distribution of values.
- Facilitates high-level insights into the total impact or performance.
2. Averaging:
- Calculating the mean, median, or mode of a set of values, like finding the average age of a group of people or the median income in a region.
- It provides a representative central value that summarizes the dataset.
- Facilitates easy comparison across different groups or regions.
- Mean is sensitive to outliers, while median is robust to extreme values.
- Mode represents the most frequent value and is applicable for categorical or discrete data.
- Consider the shape of the data distribution when choosing the appropriate measure.