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第79行： − 如果区域能力评估值超过1，一个国家在某一产品中的出口份额就大于该产品在全球贸易中的份额。根据这一措施，当 RCA (c，i)大于或等于1时，国家 c 被称为出口产品 i。当 RCA (c，i)小于1时，c 国不是有效的出口国。根据这个惯例，一对货物 i 和 j 之间的接近度定义如下:+ − :<math>\phi_{i,j} = \min\{\Pr(\text{RCA} x_i \geq 1 \mid \text{RCA} x_j \geq 1), \Pr(\text{RCA} x_j \geq 1 \mid \text{RCA} x_i \geq 1)\}</math>+ − 1 mid text { RCA } x j geq 1) ，Pr (text { RCA } x j geq 1 mid text { RCA } x i geq 1)} </math > +
→The concept of ‘proximity’
RCA 是一个严格的标准，用以考虑在全球市场的竞争性出口。为了将边际出口排除在外，一个国家如果出现显示比较优势，就称之为出口。使用巴拉萨对RCA的定义，x(c,i)等于c国在第i货物中的出口价值。
RCA 是一个严格的标准，用以考虑在全球市场的竞争性出口。为了将边际出口排除在外，一个国家如果出现显示比较优势，就称之为出口。使用巴拉萨对RCA的定义，x(c,i)等于c国在第i货物中的出口价值。
<math>\text{RCA}_{c,i}=\frac{{x(c,i)}/{\sum_i x(c,i)}}
<math>\text{RCA}_{c,i}=\frac{{x(c,i)}/{\sum_i x(c,i)}}
{{\sum_c x(c, i)}/{\sum_{c,i}x(c,i)}}</math>
{{\sum_c x(c, i)}/{\sum_{c,i}x(c,i)}}</math>
If the RCA value exceeds one, the share of exports of a country in a given product is larger than the share of that product in all global trade. Under this measure, when RCA(c,i) is greater than or equal to 1, country c is said to export product i. When RCA(c,i) is less than 1, country c is not an effective exporter of i. With this convention, the proximity between a pair of goods i and j is defined in the following way:
If the RCA value exceeds one, the share of exports of a country in a given product is larger than the share of that product in all global trade. Under this measure, when RCA(c,i) is greater than or equal to 1, country c is said to export product i. When RCA(c,i) is less than 1, country c is not an effective exporter of i. With this convention, the proximity between a pair of goods i and j is defined in the following way:
如果RCA评估值超过1，一个国家在某一产品中的出口份额就大于该产品在'''<font color="#ff8000">全球贸易 global trade</font>'''中的份额。根据这一措施，当 RCA(c，i)大于或等于1时，国家 c 被称为出口产品 i。当 RCA(c，i)小于1时，c 国不是有效的出口国。根据这个惯例，一对货物 i 和 j 之间的接近度定义如下:
<math>\phi_{i,j} = \min\{\Pr(\text{RCA} x_i \geq 1 \mid \text{RCA} x_j \geq 1), \Pr(\text{RCA} x_j \geq 1 \mid \text{RCA} x_i \geq 1)\}</math>
<math>\phi_{i,j} = \min\{\Pr(\text{RCA} x_i \geq 1 \mid \text{RCA} x_j \geq 1), \Pr(\text{RCA} x_j \geq 1 \mid \text{RCA} x_i \geq 1)\}</math>
<math>\phi_{i,j} = \min\{\Pr(\text{RCA} x_i \geq 1 \mid \text{RCA} x_j \geq 1), \Pr(\text{RCA} x_j \geq 1 \mid \text{RCA} x_i \geq 1)\}</math>
<math>\Pr(\text{RCA}_i \geq 1 \mid \text{RCA}_j \geq 1)</math> is the conditional probability of exporting good ''i'' given that you export good ''j''. By considering the minimum of both conditional probabilities, we eliminate the problem that arises when a country is the sole exporter of a particular good: the conditional probability of exporting any other good given that one would be equal to one for all other goods exported by that country.
<math>\Pr(\text{RCA}_i \geq 1 \mid \text{RCA}_j \geq 1)</math> is the conditional probability of exporting good ''i'' given that you export good ''j''. By considering the minimum of both conditional probabilities, we eliminate the problem that arises when a country is the sole exporter of a particular good: the conditional probability of exporting any other good given that one would be equal to one for all other goods exported by that country.