2018-10-07

Study

3 分钟读完 (大约 406 个字)

Log transform with O

Variables log-transform is a common method to obtain the elasticities or a requirement such as estimating a Cobb-Douglas or translog form production function. However, when we encounter the zero-valued observation, what should we do? Because log(0) is undefined.

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2017-03-17

Study

10 分钟读完 (大约 1570 个字)

Missing values

from http://stats.idre.ucla.edu/stata/faq/how-can-i-see-the-number-of-missing-values-and-patterns-of-missing-values-in-my-data-file/

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Xiaoshi Zhou

Researcher

Nanjing, Jiangsu

文章

42

分类

7

标签

11

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