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咨询工程师丨《实务》第五章学习笔记分享(下)

  • 2026-02-10 21:21:00
咨询工程师丨《实务》第五章学习笔记分享(下)
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第五章  市场分析(下)

本章重点:“一元线性回归”、“弹性系数法”、“消费系数法”、“购买力估算法”

2、弹性系数法

1)收入弹性 

ε 1=购买量变化率/收入变化率=(Δ Q/Q)/(Δ I/I) 

2)价格弹性 

ε p=购买量的变化率/价格变化率=(Δ Q/Q)/(Δ P/P)  一般为负数

3)能源需求弹性

ε e=能源消费量变化率/国内生产总值变化率=(Δ E/E)/(Δ GDP/GDP)

总结:分子是量的变化率,分母是价的变化率

3、消费系数法 

消费系数是指某种产品在各个行业(或部门、地区、人口、群体等)的单位消费量。是对某种产品在各个行业的消费数量进行分析,在了解各个行业规划产量的基础上,汇总各个行业的需求量,从而得出该产品的总需求量。

(1)根据预测样本数据,可求得某部门的消费系数:

ei=某部门产品消费量xi/该部门产品的产量 y

4、购买力估算法

预测居民的预期购买力 

居民的预期购买力=居民的预期货币收入-税收支付-存款净增额-其他非商品支出

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三、延伸预测法

1、简单移动平均法 

简单移动平均法原理是对过去若干历史数据求算术平均数,并把算术平均数作为以后时期的预测值。

简单移动平均可以表述为:

Ft+1t+1 时的预测数; n 是移动时段的长度。

1)n 的选择:

n 值越小,表明对近期观测值预测的作用越重视,预测值对数据变化的反应速度也越快,但预测的修 匀程度较低,估计值的精度也可能降低

n 值越大,预测值的修匀程度越高,但对数据变化的反映程度较慢。n 的值一般在 3-200 之间。) 

对于具有趋势性或阶跃型特点的数据,为提高预测值对数据变化的反应速度,减少预测误差,n 值取 较小一些。 

2)简单移动平均法的特点:

优点:简单易行,容易掌握。

缺点:只是在处理水平型历史数据时才有效,在现实经济生活中,历史数据的类型远比水平型复杂,这就限制了移动平均法的应用范围。

2、指数平滑法 

对时间序列x1x2x3„„,xt,一次平滑指数公式为:

Ftα xt+(1-α Ft-1 

式中:α 是平滑系数,0<α <1; 

xt是历史数据序列x 在 t 时的观测值; 

FtFt-1t 时和 t-1 时的平滑值。 

实际上是前一观测值和当前观测值之间的权重。

1)α值的确定:

观测值呈较稳定的水平发展,α 值取0.1-0.3 之间; 

观测值波动较大时,α 值取0.3-0.5 之间; 

观测值呈波动很大时,α 值取0.5-0.8 之间。 

大的α 值导致较小的平滑效果,而较小的α 值会产生客观的平滑效果。因此,在简单指数平滑方法的应用过程中,α 值对预测结果所产生的影响不亚于简单移动平均法中n 的影响。 

2)初始值F0的确定:

当时间序列期数在20 个以上时,初始值F0对预测结果的影响很小,可用第一期的观测值代替,即Fx1

当时间序列期数在20 个以下时,初始值 F0对预测结果有一定影响,可取前3~5 个观测值的平均值代替,如:F0=(x1x2x3/3。

(以上内容综合自官方教材、林轩老师讲义

如有侵权,联系删除)

咨询工程师丨《实务》第一章学习笔记分享

咨询工程师丨《实务》第二章学习笔记分享

咨询工程师丨《实务》第三章学习笔记分享

咨询工程师丨《实务》第四章学习笔记分享(上)

咨询工程师丨《实务》第四章学习笔记分享(下)

咨询工程师丨《实务》第五章学习笔记分享(上)

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  1. CONNECT:[ UseTime:0.000554s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000745s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000698s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000335s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000542s ]
  6. SELECT * FROM `set` [ RunTime:0.000257s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000567s ]
  8. SELECT * FROM `article` WHERE `id` = 461916 LIMIT 1 [ RunTime:0.000479s ]
  9. UPDATE `article` SET `lasttime` = 1770883813 WHERE `id` = 461916 [ RunTime:0.005399s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 461916 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000457s ]
  12. SELECT * FROM `article` WHERE `id` > 461916 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002589s ]
  13. SELECT * FROM `article` WHERE `id` < 461916 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011350s ]
  14. SELECT * FROM `article` WHERE `id` < 461916 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004515s ]
  15. SELECT * FROM `article` WHERE `id` < 461916 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002580s ]
0.106389s