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用Python做科研级画图——残差图

  • 2026-06-22 02:35:50
用Python做科研级画图——残差图

大家好,我是你们的小帅学长。

上一期我们讲了回归拟合线:线性?非线性?怎么选?

但这里有一个更关键的问题,很多人都会忽略,你画的那条回归线,真的可靠吗?

因为一条线“贴合数据”,并不代表它是“正确模型”

你需要一个工具来做“体检”——残差图(Residual Plot)

01.什么是残差?

定义:残差 = 真实值 − 预测值

residual = y_true − y_pred

它表示,模型“没有解释掉”的那部分信息。

02.残差图在看什么?

残差图通常是:x 轴:自变量或预测值

          y 轴:残差

可以把它理解为把“误差”单独拿出来看结构。

03.理想的残差图长什么样?

判断标准为好模型的残差图应该像“随机噪声”。

也就是:围绕 0 上下波动

   没有明显趋势

   没有结构

这说明,模型已经把“可解释的关系”解释完了。

04.三种典型“问题残差图”

1.出现曲线趋势

表现为残差呈 U 型 / 弯曲,说明了你用了线性模型,但真实关系是非线性

解决方法:用二次、多项式、非线性模型

2.漏斗形(异方差)

表现为左边小、右边大或逐渐扩散

说明了方差不恒定(heteroscedasticity)

解决方法:log 变换、加权回归

3.结构性分层

表现为残差分成几层

说明了你忽略了某个分类变量

解决:分组建模、加入变量

05.论文级残差图模板

回归图告诉你“关系”,残差图告诉你“问题”。下面是一段可直接复用的代码:

import osimport numpy as npimport matplotlib as mplimport matplotlib.pyplot as pltfrom matplotlib import font_manager as fm# =========================# 字体设置# =========================win_fonts = r"C:\Windows\Fonts"for p in [    os.path.join(win_fonts, "times.ttf"),    os.path.join(win_fonts, "timesbd.ttf"),    os.path.join(win_fonts, "timesi.ttf"),    os.path.join(win_fonts, "simsun.ttc"),]:    if os.path.exists(p):        try:            fm.fontManager.addfont(p)        except Exception:            passmpl.rcParams["font.family"] = ["Times New Roman""SimSun"]mpl.rcParams["axes.unicode_minus"] = False# =========================# 输出路径# =========================OUT_DIR = r"D:\py_figs"os.makedirs(OUT_DIR, exist_ok=True)# =========================# 构造数据(带非线性)# =========================np.random.seed(42)x = np.linspace(-33200)y = x**2 + np.random.normal(01200)# =========================# 线性拟合# =========================coef = np.polyfit(x, y, 1)y_pred = np.poly1d(coef)(x)residuals = y - y_pred# =========================# 绘图# =========================fig, axes = plt.subplots(12, figsize=(10,4))axes[0].scatter(x, y, s=12, alpha=0.4)axes[0].plot(x, y_pred, color="red", linewidth=2)axes[0].set_title("Regression / 回归拟合")axes[0].set_xlabel("X")axes[0].set_ylabel("Y")axes[1].scatter(x, residuals, s=12, alpha=0.4)axes[1].axhline(0, color="red", linestyle="--")axes[1].set_title("Residual Plot / 残差图")axes[1].set_xlabel("X")axes[1].set_ylabel("Residual")for ax in axes:    for spine in ax.spines.values():        spine.set_linewidth(1.2)# =========================# 保存# =========================out_path = os.path.join(OUT_DIR, "residual_plot.jpg")fig.savefig(out_path, dpi=300, bbox_inches="tight")plt.close()print("Saved:", out_path)

回归线告诉你“看起来对不对”,残差图告诉你“实际上对不对”。

接下来,我们将学习一个非常高频、也是最容易画乱的图:《相关矩阵热力图》。你会遇到这些问题:数字太多看不清、颜色太乱、标注重叠。下一篇我会教你:如何 mask 半矩阵、如何排序让结构更清晰、如何让热力图“干净且高级”。这一篇,会直接提升你的论文图质量。

——期待你的关注—— 

往期内容:

用Python做科研级画图——分组散点的编码策略

用Python做科研级画图——回归拟合线

用Python做科研级画图——KDE密度

用Python做科研级画图——散点图基础模板

用Python做科研级画图——异常值可视化

用Python做科研级画图——雨云图

用Python做科研级画图——小提琴图

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  1. CONNECT:[ UseTime:0.000568s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000780s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000303s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000289s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000482s ]
  6. SELECT * FROM `set` [ RunTime:0.000215s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000623s ]
  8. SELECT * FROM `article` WHERE `id` = 493926 LIMIT 1 [ RunTime:0.000500s ]
  9. UPDATE `article` SET `lasttime` = 1783100581 WHERE `id` = 493926 [ RunTime:0.008632s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000313s ]
  11. SELECT * FROM `article` WHERE `id` < 493926 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000497s ]
  12. SELECT * FROM `article` WHERE `id` > 493926 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001840s ]
  13. SELECT * FROM `article` WHERE `id` < 493926 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001620s ]
  14. SELECT * FROM `article` WHERE `id` < 493926 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001141s ]
  15. SELECT * FROM `article` WHERE `id` < 493926 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009613s ]
0.118070s