For all economic calendar indicators, you will find the Previous number: that is the data in its last release (frequency of data release is variable: it can be last month, last trimester…). For most indicators, we add a Consensus number: that is a general agreement of experts on the outcome of the number. When the Actual data is released, it’s immediately displayed at the right of the volatility indicator. Better or worse than expected? If we had a consensus published, it comes either in green (it means the data is better than expected) or in red (worse than expected). The Deviation ratio is an FXStreet exclusive calculation which measures the surprise caused by an event when the Actual data differs from the Consensus. Its number usually oscillates in an open scale between -7 and +7. 
The factors mentioned above can also cause a currency to decline. For example, the currency of a country with low inflation will generally rise because that country's purchasing power is higher relative to other currencies. Even natural disasters such as earthquakes or tsunamis, which put a strain on a nation’s economy, can have a negative impact on a currency.
One potentially beneficial and profitable Forex trading strategy is the 4-hour trend following strategy. However, the 4-hour timeframe makes it more suitable for swing traders. This strategy uses a 4-hour base chart to screen for potential trading signal locations. The 1-hour chart is used as the signal chart, to determine where the actual positions will be taken.
A forex trading strategy works really well when traders follow the rules. But just like anything else, one particular strategy may not always be a one-size-fits-all approach, so what works today may not necessarily work tomorrow. If a strategy isn't proving to be profitable and isn't producing the desired results, traders may consider the following before changing a game plan: 
76% of retail accounts lose money when trading CFDs with this provider. CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 76% of retail investor accounts lose money when trading CFDs with this provider. You should consider whether you understand how CFDs work and whether you can afford to take the high risk of losing your money.