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Hello,A new beta version (4.50.4) of AmiBroker has
just been released.
This should be last beta before official release.
It is available for registered users only from the members area
at:<A
href=""><FONT
size=2>http://www.amibroker.com/members/bin/ab4504beta.exe<FONT
size=2>and<A
href=""><FONT
size=2>http://www.amibroker.net/members/bin/ab4504beta.exe<FONT
size=2>(File size: 643 851 bytes, 643 KB)If you forgot
your user name / password to the members areayou can use automatic reminder
service at: <FONT
size=2>http://www.amibroker.com/login.htmlThe
instructions are available below and in the "ReadMe" file( Help->Read Me
menu from AmiBroker )
CHANGES FOR VERSION 4.50.4 (as compared to 4.50.3)
portfolio report now shows "N/A" instead of -1#INF and similar strange
looking things that appeared when there were no trades (division by zero)
removed the extra 'z' letter in fprintf formatting sequence (that caused
crash on exit when saving params)
correct column type (alpha) is set for the first column in individual
backtest
'show current trade arrows' works OK after portfolio backtest
when timeshift is not equal zero in intraday databases then DateNum(),
Day(), Month(), Year(), DayOfWeek() and DayOfMonth() functions adjust date
(day) when bar time is 'shifted' outside 0..24 hour range.
rotational mode: all OHLC fields in artificial future bar are filled with
close price of last bar for consistency with regular mode and to prevent
problems with stops hit on artificial future bar in rotational
mode.
Best regards,Tomasz Janeczkoamibroker.com
AmiBroker 4.50.4 Beta Read Me
December 9, 2003 15:15
THIS IS A BETA VERSION OF THE SOFTWARE. EXPECT BUGS !!!
Backup your data files and entire AmiBroker folder
first!
INSTALLATION INSTRUCTIONS
IMPORTANT: This archive is update-only. You have to install full
version 4.40 first.
Just run the installer and follow the instructions.
Then run AmiBroker. You should see "AmiBroker 4.50.4 beta" written in the
About box.
See CHANGE LOG below for detailed list of changes.
HELP ON NEW FEATURES
New backtest report
New report is hugely enhanced compared to old one. It includes separate
statistics for all, long and short sides as well as large number of new metrics.
You can get short help on given figure by hovering your mouse over given field
name. You will see the description in the tooltip. Short explanations are
provided also below:
Exposure % - modified since last release
-'Market exposure of the trading system calculated on bar by bar basis. Sum of
bar exposures divided by number of bars. Single bar exposure is the value of
open positions divided by portfolio equity.
Net Risk Adjusted Return % - Net profit % divided by
Exposure %
Annual Return % - Compounded Annual Return % (CAR)
Risk Adjusted Return % - Annual return % divided by Exposure
%
Avg. Profit/Loss - (Profit of winners + Loss of
losers)/(number of trades)
Avg. Profit/Loss % - '(% Profit of winners + % Loss of
losers)/(number of trades)
Avg. Bars Held - sum of bars in trades / number of
trades
Max. trade drawdown - The largest peak to valley decline
experienced in any single trade
Max. trade % drawdown - The largest peak to valley
percentage decline experienced in any single trade
Max. system drawdown - The largest peak to valley decline
experienced in portfolio equity
Max. system % drawdown - The largest peak to valley
percentage decline experienced in portfolio equityRecovery
Factor - Net profit divided by Max. system
drawdownCAR/MaxDD - Compound Annual % Return divided by
Max. system % drawdown
RAR/MaxDD - Risk Adjusted Return divided by Max. system %
drawdown
Profit Factor - Profit of winners divided by loss of
losers
Payoff Ratio - Ratio average win / average
lossStandard Error - Standard error measures chopiness
of equity line. The lower the better.
Risk-Reward Ratio - Measure of the relation between the risk
inherent in a trading the system compared to its potential gain. Higher is
better. Calculated as slope of equity line (expected annual return) divided by
its standard error.
Ulcer Index - Square root of sum of squared drawdowns
divided by number of bars
Ulcer Performance Index - (Annual profit - Tresury notes
profit)/Ulcer Index'>Ulcer Performance Index. Currently tresury notes profit
is hardcoded at 5.4. In future version there will be user-setting for this.
Sharpe Ratio of trades - Measure of risk adjusted return of
investment. Above 1.0 is good, more than 2.0 is very good. More information <A
href="">http://www.stanford.edu/~wfsharpe/art/sr/sr.htm
. Calculation: first average percentage return and standard deviation of returns
is calculated. Then these two figures are annualized by multipling them by ratio
(NumberOfBarsPerYear)/(AvgNumberOfBarsPerTrade). Then the risk free rate of
return is subtracted (currently hard-coded 5) from annualized average return and
then divided by annualized standard deviation of
returns.K-Ratio - Detects inconsistency in returns.
Should be 1.0 or more. The higher K ratio is the more consistent return you may
expect from the system. Linear regression slope of equity line multiplied by
square root of sum of squared deviations of bar number divided by standard error
of equity line multiplied by square root of number of bars. More information:
Stocks & Commodities V14:3 (115-118): Measuring System Performance by Lars
N. Kestner
Optimization in new portfolio backtester
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