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                ## 6.10 其他因素的修正 通常,我們對繪制感興趣的變量受我們感興趣的因素以外的其他因素影響的數據感興趣。例如,假設我們想了解汽油價格隨時間的變化。圖[6.16](#fig:gasPrices)顯示了歷史天然氣價格數據,繪制了通貨膨脹調整或不調整。雖然未經調整的數據顯示大幅增長,但經調整的數據顯示,這主要是通脹的反映。其他需要根據其他因素調整數據的例子包括人口規模(如前一章中的犯罪率示例所示)和不同季節收集的數據。 ![The price of gasoline in the US from 1930 to 201 (obtained from http://www.thepeoplehistory.com/70yearsofpricechange.html) with or without correction for inflation (based on Consumer Price Index).](https://img.kancloud.cn/89/01/8901382dd37ddc9a9512f36dc7d49c81_384x384.png) 圖 6.16 美國 1930-201 年汽油價格(從[http://www.thepoplehistory.com/70yearsofpricechange.html](http://www.thepeoplehistory.com/70yearsofpricechange.html)獲得),有無通貨膨脹修正(基于消費者價格指數)。
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