头寸是金融行业常用到的一个词，在金融、证券、股票、期货交易中经常用到。 比如在期货交易中建仓时,买入期货合约后所持有的头寸叫多头头寸,简称多头;卖出期货合约后所持有的头寸叫空头头寸,简称空头。商品未平仓多头合约与未平仓空头合约之间的差额就叫做净头寸。空头净额比率指的是净空头寸占所有持仓的比例。

在任何市场条件下， 多单和空单的数量不应该是一样的多的吗？那空单比例总是50%呀？

A sentiment indicator that is derived by dividing the short interest by the average daily volume for a stock. This indicator is used by both fundamental and technical traders to identify the prevailing sentiment the market has for a specific stock.

Also known as the "short ratio".

The Difference Between a Short Interest Ratio and Short Interest
It is essential to remember that the short interest ratio and short interest are not the same. Short interest measures the total number of shares that have been sold short in the market. The short interest ratio is a formula used to measure how many days it would take for all the shares short in the market place to be covered.