2022年6月18日更新：辛辛苦苦大半年，一夜回到解放前！今日比特币价格就快跌破1.8万美元了。恐惧指数为6，前所未有的低，表明市场上极度恐慌。据传很多大机构都被清算祭天了，请大家在币圈内一定要注意风险啊。。。
目前的恐惧和贪婪指数【动态更新】
【本文首发于2018年7月28日】2018年7月的比特币市场，按我看来，既不是熊市也不是牛市，而是上窜下跳的猴市。比特币先跌到USD $6000之下，然后市场传言美国SEC有90%概率会通过比特币ETF，一下子比特币升到USD $8500，接着又有消息SEC拒绝了一个比特币ETF申请也可能会陆续拒绝其他的申请，比特币就跌回了USD $8000以下。
其实比特币市场是挺有意思的。举个例子吧，新上市的iPhone价格$1500，假设有个商家说促销$800就卖，那肯定会被人疯抢。而比特币USD $6000的时候人人喊割肉没人愿意买，等比特币升到USD $8000的时候大家都说牛市来了拼命往交易所搬砖。这不是很奇怪吗？
其实大家都在买买买的时候，很可能价格短期见顶了；而没人敢买入的时候，却是价格快到底的时候。伟大导师鲁迅曾教导我们：“别人恐惧的时候，我贪婪；别人贪婪的时候，我恐惧”。这应该是我们如何调整交易心态的秘诀。
今天我们就介绍一个在比特币交易中很有用的参考指数：恐惧和贪婪指数（Crypto Fear & Greed Index），其网站链接是：https://alternative.me/crypto/fear-and-greed-index/
这个指数为0时表示极度恐惧，100则表示极度贪婪（Zero means "Extreme Fear", while 100 means "Extreme Greed"）。从上面的历史数据中可看出，当这个指数低于20的时候，是个比较好的买入机会，而当这个指数超过60就基本可以考虑卖了。
恐惧和贪婪指数包含下面的一些权重值：
1）波动性：Volatility (25 %)
We’re measuring the current volatility and max. drawdowns of bitcoin and compare it with the corresponding average values of the last 30 days and 90 days. We argue that an unusual rise in volatility is a sign of a fearful market.
2）市场交易量：Market Momentum/Volume (25%)
Also, we’re measuring the current volume and market momentum (again in comparison with the last 30/90 day average values) and put those two values together. Generally, when we see high buying volumes in a positive market on a daily basis, we conclude that the market acts overly greedy / too bullish.
3）社交媒体热度：Social Media (15%)
While our reddit sentiment analysis is still not in the live index (we’re still experimenting some market-related key words in the text processing algorithm), our twitter analysis is running. There, we gather and count posts on various hashtags for each coin (publicly, we show only those for Bitcoin) and check how fast and how many interactions they receive in certain time frames). A unusual high interaction rate results in a grown public interest in the coin and in our eyes, corresponds to a greedy market behaviour.
4）市场调查：Surveys (15%)
Together with strawpoll.com (disclaimer: we own this site, too), quite a large public polling platform, we’re conducting weekly crypto polls and ask people how they see the market. Usually, we’re seeing 2,000 - 3,000 votes on each poll, so we do get a picture of the sentiment of a group of crypto investors. We don’t give those results too much attention, but it was quite useful in the beginning of our studies. You can see some recent results here.
5）比特币在总体电子货币中的比例：Dominance (10%)
The dominance of a coin resembles the market cap share of the whole crypto market. Especially for Bitcoin, we think that a rise in Bitcoin dominance is caused by a fear of (and thus a reduction of) too speculative alt-coin investments, since Bitcoin is becoming more and more the safe haven of crypto. On the other side, when Bitcoin dominance shrinks, people are getting more greedy by investing in more risky alt-coins, dreaming of their chance in next big bull run. Anyhow, analyzing the dominance for a coin other than Bitcoin, you could argue the other way round, since more interest in an alt-coin may conclude a bullish/greedy behaviour for that specific coin.
6）谷歌热词分析：Trends (10%)
We pull Google Trends data for various Bitcoin related search queries and crunch those numbers, especially the change of search volumes as well as recommended other currently popular searches. For example, if you check Google Trends for "Bitcoin", you can’t get much information from the search volume. But currently, you can see that there is currently a +1,550% rise of the query „bitcoin price manipulation“ in the box of related search queries (as of 05/29/2018). This is clearly a sign of fear in the market, and we use that for our index.
2020年3月9日更新：最近的全球金融市场让我想起了无限流小说的开山鼻祖《无限恐怖》，大家投资时要谨记，一切投资均有风险啊。。。
2020年3月13日更新：前面的24小时内，比特币圈内的朋友也见证了历史，从USD $7800跌破USD $3800，然后又迅速反抽回USD $5000以上。只要你是上杠杆的散户，就有极大可能性被多空双爆，真是太刺激了。目前的比特币恐惧指数到了10，这让我想起了一部二战电影《至暗时刻》。。。
2020年3月13日更新：前面的24小时内，比特币圈内的朋友也见证了历史，从USD $7800跌破USD $3800，然后又迅速反抽回USD $5000以上。只要你是上杠杆的散户，就有极大可能性被多空双爆，真是太刺激了。目前的比特币恐惧指数到了10，这让我想起了一部二战电影《至暗时刻》。。。
2021年2月9日更新：最近几天比特币屡破新高（最高时超过USD $48000）。今日贪婪指数达到了95，请大家一定要注意风险啊。。。
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