Wrote this indicator last weekend and have decided to share it.
Installation instructions:
1) Close your MT4
2) Copy attached "Standard Deviation.ex4" to your MT4's AppData directory, e.g. C:\Users\swelz\AppData\Roaming\MetaQuotes\Terminal\676449683C76BB0F88D7085CCA122DEE\MQL4\Indicators. This...