📈 线性回归计算器Linear Regression Calculator
输入 x、y 数据对，计算最小二乘回归直线 y = a + bx、相关系数 r 和决定系数 R²，可做预测。Least-squares regression line y = a + bx, correlation r and R² from x/y pairs, with prediction.
使用说明与常见问题How-to & FAQ
「线性回归计算器」是什么？What is the Linear Regression Calculator?
输入 x、y 数据对，计算最小二乘回归直线 y = a + bx、相关系数 r 和决定系数 R²，可做预测。Least-squares regression line y = a + bx, correlation r and R² from x/y pairs, with prediction.
如何使用「线性回归计算器」？How do I use the Linear Regression Calculator?
在「线性回归计算器」中，填写「预测 x」等参数，结果会随输入实时计算并显示在下方。In the Linear Regression Calculator: Fill in "Predict at x"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「线性回归计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Linear Regression Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「线性回归计算器」免费吗？需要注册吗？Is the Linear Regression Calculator free? Do I need an account?
「线性回归计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Linear Regression Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.