统计 (tǒngjì) means to systematically count or compile statistics, often for data, surveys, or reports — it's about gathering and summarizing numerical information. This is different from 数 (shǔ), which just means to count items one by one (like counting money or people), and from 计算 (jìsuàn), which is about calculating or computing results. 统计 is more formal and data-oriented, used in business, research, or official contexts.