Short Term: Given we only have data for gold prices daily, we saw that there was quite a bit of volatility when Futures were introduced. There was a run-up to the Gold Futures launch — followed by a dip in prices for about 2 years. After which, gold prices started to come back to all-time high levels.
In statistics, the standard deviation (SD, also represented by the Greek letter sigma σ or the Latin letter s) is a measure that is used to quantify the amount of variation or dispersion of a set of data values. A low standard deviation indicates that the data points tend to be close to the mean (also called the expected value) of the set, while a high standard deviation indicates that the data points are spread out over a wider range of values.
Bitcoin fell to the lowest level in more than a month after a report that Chinese regulators are cracking down again on the cryptocurrency, targeting mobile apps and online platforms used for trading. South Korea’s government is also debating how to contain the mania in digital assets after raiding two exchanges last week.
SegWit proposes significant backward compatibility. It hides its increased block size by changing the definition of a block to be measured as one million "units" instead of bytes. The "witness" signature data would be separated from the Merkle tree record of who is sending or receiving the bitcoin. The "witness" data is moved to the end, and each byte of it would only count as one quarter of a "unit". The overall effect would be changing the average block size to about 1.8 MB instead of 1.
To prove that a specific transaction is included in a block, a node only needs to produce log2(N) 32-byte hashes, constituting an authentication path or merkle path connecting the specific transaction to the root of the tree. This is especially important as the number of transactions increases, because the base-2 logarithm of the number of transactions increases much more slowly. This allows bitcoin nodes to efficiently produce paths of 10 or 12 hashes (320–384 bytes), which can provide proof of a single transaction out of more than a thousand transactions in a megabyte-size block.