当前位置:首页>考研真题>《卫生统计学》公卫考研真题拆解第1期 | 中山大学353:方差分析与Ⅰ类错误控制!

《卫生统计学》公卫考研真题拆解第1期 | 中山大学353:方差分析与Ⅰ类错误控制!

  • 2026-04-24 17:05:53
《卫生统计学》公卫考研真题拆解第1期 | 中山大学353:方差分析与Ⅰ类错误控制!

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1

前言

方差分析是卫生统计学中连接”描述”与”推断”的核心方法,也是353考研计算题的常驻嘉宾。2026年中山大学这道真题,以三种降压药物的疗效比较为场景,给出了不完整的方差分析表,要求考生从Ⅰ类错误控制、样本量推算、变异分解三个维度进行深度分析,最后还要提出**协方差分析的改进方案。

这道题的高明之处在于:它不仅考你会不会算F值,更考你懂不懂为什么不能用多次t检验代替方差分析——这是统计学思维的”分水岭”。很多考生能背出”会增大Ⅰ类错误”,却写不出具体的概率计算式;知道”总自由度=组间+组内”,却推不出样本量。今天,我们把这三个”知道但写不出”的痛点,一次性解决!

2

真题再现

83、比较缬沙坦、氢氯噻嗪、拉西地平3种药物对首次确诊的原发性高血压患者治疗6个月后的降压效果(平均血压的变化程度,mmHg),关于疗效对比的统计分析,所得方差分析表

(1)设检验水准α=0.05,从统计学检验中Ⅰ类错误的角度,试述用两两间对比的3次t检验取代完全随机资料的方差分析,有何不妥之处?列出必要的算式,但不必完成计算。

(2)由附表可知,本题研究的总样本量是多少?

(3)自由度v、SS、MS三者的关系是怎样的?请列出式子

(4)如果希望扣除初诊时患者年龄(岁)对疗效评估可能造成的干扰,应如何调整研究方案?

3

满分答案

(1)多次t检验取代方差分析的不妥之处(核心得分点)

核心问题:增大Ⅰ类错误概率

完全随机设计的多组比较,若用两两t检验(3组需进行次t检验),会累积Ⅰ类错误。

Ⅰ类错误定义:拒绝了实际成立的 H0(假阳性)。

概率累积公式:

其中:-α=0.05(每次t检验的检验水准) - k=3(两两比较次数)

代入计算:

结论:3次t检验后,总的Ⅰ类错误概率约为14.26%,远高于设定的0.05,假阳性风险显著增加。

⭐ 评分关键:答出”增大Ⅰ类错误”得1分;写出组合数得1分;列出公式得1分;计算出14.26%得1分。

(2)总样本量的推算

原理:完全随机设计方差分析中,总自由度v=N-1

已知:v=11

计算:

N=v+1=11+1=12

验证:-组数k=3(3种药物)-组间自由度v组间=k-1=2 ✓-组内自由度v组内=N-k=12-3=9  ✓总自由度v=v组间+v组内=2+9=11 ✓

结论:总样本量为12人,每组约4人。

(3)自由度、SS、MS的关系

① 自由度关系(可加性):

ν药物间误差

11=2+9

② 平方和关系(可加性):

SS=SS药物间+SS误差

105.67=96.7+9.50

③ 均方与平方和、自由度的关系:

(4)扣除年龄干扰的研究方案调整

方案:采用协方差分析(ANCOVA)可采用协方差分析:以“降压效果(血压变化)”为因变量,“药物种类”为自变量,“初诊年龄”为协变量,通过协方差分析扣除年龄的混杂作用,再比较不同药物的降压效果。

4

核心知识点复习

知识点1:Ⅰ类错误与Ⅱ类错误的辨析

多次比较问题:每做一次独立检验,就有α的概率犯Ⅰ类错误。k次独立检验后,至少犯一次Ⅰ类错误的概率为 1−(1−α)k

Bonferroni校正:将检验水准调整α′=α/k,控制总Ⅰ类错误率。

知识点2:完全随机设计 vs 随机区组设计 vs 协方差分析

本题选择协方差分析的理由:年龄是连续变量,无法作为区组因素,最适合作为协变量进行回归调整。

5

秒杀口诀

✔ Ⅰ类错误累积口诀

“多次t检验错误积,Bonferroni来救急;公式记住一减k次方,计算结果不会忘”

✔ 方差分析自由度口诀

“总自由等于n减一,组间等于k减一;组内等于n减k,三者关系要牢记”

✔ 变异分解口诀

“平方和可加,自由度也可加;均方是除法,F值是除法比”

✔ 协方差分析口诀

“连续混杂做协变,回归调整再方差;年龄基线要扣除,药物疗效才真实”

6

下期预告

下一期我们将拆解重庆医科大学353的多重线性回归与Logistic回归真题——“老年人营养状况与身体功能的多重回归分析”,这道题涵盖置信区间解释、相关系数解读、回归系数含义、决定系数辨析以及OR值解释五大考点,是卫生统计学回归分析板块的集大成者!

关注本号,持续更新2026年卫生统计学典型真题拆解,助你353专业课高分上岸!

本文题目来源:中山大学353 2026年真题 

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  1. CONNECT:[ UseTime:0.000675s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000848s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000308s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000305s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000493s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000538s ]
  8. SELECT * FROM `article` WHERE `id` = 481591 LIMIT 1 [ RunTime:0.000456s ]
  9. UPDATE `article` SET `lasttime` = 1777070020 WHERE `id` = 481591 [ RunTime:0.001893s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000249s ]
  11. SELECT * FROM `article` WHERE `id` < 481591 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000412s ]
  12. SELECT * FROM `article` WHERE `id` > 481591 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000407s ]
  13. SELECT * FROM `article` WHERE `id` < 481591 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000582s ]
  14. SELECT * FROM `article` WHERE `id` < 481591 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001247s ]
  15. SELECT * FROM `article` WHERE `id` < 481591 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004706s ]
0.085479s