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The Bar Magnifier backtest feature is important for precise backtesting. Bar magnifier can be considered as a replay of the way a bar was formed. The user can choose a replay frequency that is based on number of ticks or number of minutes.
There is a tradeoff between the level of precision in a replay and memory requirements. Tick-by-tick replay is the most precise, but it also requires the most memory. If the strategy does not require high precision, then replays based on n-ticks or n-minutes may be sufficient.
For example, Bar Magnifier is helpful when both the profit target and stop loss occurred on the same bar. In this situation, it is unclear whether the profit target or the stop loss occurred first. With Bar Magnifier, MultiCharts is able to see how the bar was formed to determine whether the profit target or the stop loss occurred first.
<div style="background-color: #E3FBE5;">Note: We suggest to use tick because most precise<div>
<br>To use the feature:
# Open the '''Strategy Properties''' window.<br><br>To open the '''Strategy Properties''' window:
## Open the '''Format Objects''' window.<br><span>{{FormatObjectIS}}</span>
## Select the '''Signals''' tab.
## Click '''Properties''' to open the '''Strategy Properties''' window.
# Select the '''Signals''' tab.
# Click '''Properties''' button to open the Strategy Properties window.
# Select the '''Backtesting''' tab.
# In the '''Backtesting Precision''' section, select the '''Use Bar Magnifier''' checkbox.<br>MultiCharts will break down each bar into a series of lower resolution bars so that it can look to see how the bar was formed.
#* Select the '''Tick''' radio button if the chart has tick-based resolution. Enter the number of ticks for the lower resolution bars. The number of ticks must be at a lower resolution than the chart resolution, or
#* Select the '''Intra-day''' radio button if the chart has minute resolution or daily resolution. Enter the number of minutes for the lower resolution bars. The number of minutes must be at a lower resolution than the resolution of the chart, or
#* Select the '''Daily''' radio button if the chart has weekly resolution or higher. MultiCharts will break down each bar into daily bars to see how the bar was formed.
# Select the '''Skip ticks with identical prices''' checkbox for faster backtesting. MultiCharts will skip ticks with identical prices when it constructs the lower resolution bars.
<div style="background-color: #E3FBE5;">Note: If a strategy is based volume, then selecting this box may disrupt the volume calculations.</div>
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[[Category:Backtesting]]
