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真题中的描述统计,细节满满!

真题中的描述统计,细节满满!

前言

描述统计是整个统计学中的开篇内容,虽然难度不大,但却十分重要,因为可以说它构成了所有统计方法的重要基底,与后面的章节紧密相连。从考察情况来看,北师大应统对于描述统计方法也相当重视,即使是现在越发重视数理与茆书的大趋势下,2022~2026依旧每年都考描述统计大题,并且一年比一年深入(22年还在考分析报告,23年就开始考正态分布检验,24年~26年更是和统计量性质结合考察),因此大家对于这一模块,千万不要掉以轻心。对于描述统计的学习,学长有以下几点建议~~

第一,注意与后面章节的联系,切不可分割开来学习。

描述统计是基础,其他统计方法都是基于描述统计去做的。比如想要检验各组均值是否相等,除了统计检验方法(方差分析或假设检验)外,还有描述统计的方法。不管是方差分析还是假设检验,所得的均值都是描述统计的一部分,是紧密相连的。这一点也体现在2022真题的最后一题,以及2024的第一道大题,通过与其他知识的结合,综合考察了同学们对描述统计以及推断统计的知识储备与理解。

第二,树立数据分类意识。

北师大应统描述统计部分以前常考的一类大题是撰写数据分析报告。虽然近几年考的不多,但还是希望大家能予以一定的重视,因为这一类问题恰恰是最能反映统计素养的。并不是说掌握了多少稀有的图形,而是如何去处理分析数据的思路。

很多同学遇到这样的题,会匆匆忙忙地开始计算统计量与画图,其实第一时间要做的是对数据进行归类,是分类型还是数值型。如果拿到的数据是分类型数据,千万不能用数值型数据的方法。大家一定不要忽视,这么简单的知识点,往届就有同学出错了。

第三,选用合适的方法图形

在实际选择图形和统计量时,也不要单纯为了方便,直接采用自己最快想出来的图形或指标。数据分析报告,本质是要给读者呈现尽可能多的信息,那么在选用描述统计方法时,就需要思考,怎样在同样的篇幅内,为读者(阅卷老师)展现更多更不同的信息与结论。例如,同样使用两个指标,平均数+众数代表了什么?平均数+方差又代表了什么?哪个组合能说明更多的信息?指标统计量是否还能用其他方法获得?

第四,学习时要多联系实际进行思考

描述统计结果一定要结合实际进行说明。描述统计不是单纯的应试八股,对于我们所计算、分析出的结果,必须要挖掘其背后的含义,尝试进行解释,而不是得出一个结果,复述一遍就结束了。例如,2022第一道大题,如果算出这些高科技获奖者平均年龄较小,可能说明科研工作者做出重大突破时较为年轻,鼓励青年学者们多奋发钻研;如果算出这些高科技获奖者平均年龄较大,又是否与学科有关,例如基础学科的突破研究往往需要较长的一段时间才能被认可与应用,获得荣誉。总而言之,单纯的数据结果并无意义,一定要尽可能与现实实际结合,说明某种现象。

总结

最后希望同学们都能复习顺利,争取把描述统计学精学透!这一部分的知识点本身难度并不大,不要让它成为你的扣分点!

若有缘,顶峰见!

更多27北师大应统硕果计划内容,点击【阅读原文】查看~

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  1. CONNECT:[ UseTime:0.000650s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000805s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000384s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000293s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000446s ]
  6. SELECT * FROM `set` [ RunTime:0.000228s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000513s ]
  8. SELECT * FROM `article` WHERE `id` = 815798 LIMIT 1 [ RunTime:0.004710s ]
  9. UPDATE `article` SET `lasttime` = 1782722148 WHERE `id` = 815798 [ RunTime:0.003361s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000258s ]
  11. SELECT * FROM `article` WHERE `id` < 815798 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000430s ]
  12. SELECT * FROM `article` WHERE `id` > 815798 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000355s ]
  13. SELECT * FROM `article` WHERE `id` < 815798 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000603s ]
  14. SELECT * FROM `article` WHERE `id` < 815798 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001879s ]
  15. SELECT * FROM `article` WHERE `id` < 815798 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002124s ]
0.096418s