# 經濟測量學

GDPX 軸）同失業率Y 軸）之間嘅關係嘅迴歸模型（呢兩個變數大致上成反比）就涉及咗經濟測量學。
 「 原版英文："... The quantitative analysis of actual economic phenomena based on the concurrent development of theory and observation, related by appropriate methods of inference." 粵文翻譯：（經濟測量學係）對實際經濟現象嘅量化分析，基於同期嘅理論發展同埋觀察，而呢啲嘢係用適合嘅推論方法連繫埋一齊嘅。 」

## 基礎

### 迴歸分析

${\displaystyle DV=a+b(IV)}$ （線性迴歸；linear regression）；
${\displaystyle DV=a+b(IV)+c(IV)^{2}}$ （多項式迴歸；polynomial regression）；

... 等等。原則上，如果有個方法可以由過往數據嗰度搵出 ${\displaystyle a}$  同埋 ${\displaystyle b}$ 參數嘅數值，第時就可以靠條式大致上用 IV 嘅值估計 DV 嘅值；而家想像 ${\displaystyle DV}$ 失業率，而 ${\displaystyle IV}$ 本地生產總值（GDP）增長率，用過去數據得出參數 ${\displaystyle a}$ ${\displaystyle b}$  嘅數值，噉啲人第時就有可能睇到 GDP 增長嚟估計失業率嘅數值[1][2]。順帶一提，好多第啲經濟測量上用嘅方法－好似係結構方程模型（SEM）噉－查實都係迴歸分析嘅變種[4]

## 攷

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