5Lena, a data scientist, analyzes a dataset containing 1,200 entries. She finds that 35% of the entries are incomplete. After cleaning, she removes all incomplete records. Later, she splits the cleaned dataset equally into 4 subsets for cross-validation. How many complete entries are in each subset?

Fri, 01 May 2026 12:30:34 +0000

**Why 5Lena, a Data Scientist, Analyzes Dataset Quality—And What It Means for Real-World Insights** In an era where data drives decisions across industries, ensuring dataset accuracy is a foundational challenge—one that experts like 5Lena, a data scientist, regularly address. She worked with a dataset composed of 1,200 entries, only to discover that 35% were incomplete. This发现 sparked a critical analysis on data quality, data cleaning, and the importance of reliable groundwork before drawing conclusions or building models. --- ### How 5Lena Cleans Incomplete Data for Accurate Analysis