Move a slider.拖动一个滑块，
See what the chart can really tell you.看看这张图到底能说明什么。

Methods Explorer is a set of short, hands-on exercises. Each page pairs one decision with one chart: move a slider, and the note under the chart tells you what changed.方法探索是一组可以动手的小练习。每一页围绕一个决定和一张图：拖动滑块，图下面的说明会告诉你发生了什么变化。

Each page is built around one common mistake: treating the chart as if it had already made the decision for you. A pay gap might come from family savings, not the subsidy. A workshop can look helpful just because stronger students signed up. News about open seats in an elective can spread through one faculty and never reach the other. A curve can fit this year’s 24 districts closely and still miss next year’s.每一页都针对一个常见错误：把图当成已经替你做好了决定。工资差距可能来自家里的积蓄，而不是补贴；工作坊看起来有用，可能只是因为数学好的同学更愿意报名；选修课还有名额的消息，可能在一个学院里传开，却始终传不到另一个学院；一条曲线可以紧贴今年的 24 个区，到了明年却对不上。

• Causal因果 Is the pay gap the subsidy?工资差距是补贴吗？ 300 workers and a subsidy. 80 students and a workshop.300 名工人和一项补贴。80 名学生和一门工作坊。
• Networks网络 When do Arts and Engineering stop talking?文学院和工程学院什么时候断了联系？ Who talked to whom last month, and whether news about open elective seats crosses faculties.上个月谁和谁聊过天，以及选修课还有名额的消息能不能传到另一个学院。
• Machine Learning机器学习 Will this year’s curve work next year?今年的曲线明年还管用吗？ 24 districts, a penalty that reins in the curve, four faculties, and 12 new answers.24 个区、一个把曲线往回收的惩罚项、四个学院，以及本周新增的 12 个回答。
• Text as Data文本即数据 When do two headlines count as saying the same thing?两则标题什么时候算在说同一件事？ Two headlines, nine short lines, and a map of words.两则标题、九行短句，以及一张词语地图。

Guided paths学习路径

Each path walks you through a few exercises in order, with the sliders already set.每条路径按顺序带你走几页练习，滑块都已经调好。

• Path学习路径 Overfitting journey过拟合之旅 A straight line, a gentle curve, then a curve that bends to every district.先是一条直线，再是一条平缓的曲线，最后是一条迁就每个区的曲线。
• Path学习路径 Three pictures三张图 A subsidy with no effect, two faculties that never talk, and a very flexible curve.没有效果的补贴、彼此不交流的两个学院，以及一条非常灵活的曲线。
• Path学习路径 Balance, then bridges先平衡，再看桥 A loose match, a tight match, then the spare-seat news with and without cross-faculty talks.先宽松配对，再严格配对；然后看有没有跨学院交流时，选修课名额的消息能不能传出去。
• Path学习路径 Shrink the fit收紧拟合 A curve that bends to every district, then the same fit with the slopes pulled in.先是一条迁就每个区的曲线，再把同一条曲线的斜率往回收。
• Path学习路径 Counts, clusters, coordinates计数、分组、坐标 Word counts, then folders for nine short lines, then words placed on a map.先数词，再把九行短句分进文件夹，最后把词放到一张地图上。
• Path学习路径 Summarize, then compare先概括，再比较 Two headlines, a map of their words, then a match on one score.两则标题、一张词语地图，最后按一个分数配对。