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                                                   Compress bar for custom database


Salvatore Gaziano
2018-03-01 07:08:41

Dear community,
i created a custom historical database "nav_rettificati" where there are two column: "Date" is a date and "closeret" is a float. This database store the daily closing price adjusted with dividend/distribution for each symbol (the value for symbol doesn't make distribution is the same of daily closing price).
I can get access to this data in Simulator thorugh:
rettNav= GetData("nav_rettificati", "closeret", LastData);

Now i want use this to compare the 1 month performance of a fix benchmark to each stocks in my strategy.
In the past i used a system like this, but i calculate the performance on the close price in the Quote db.

In this context i created a New trading system strategies in Simulator where i did it.
The time frame bars is daily. I rebalance only at the end of each month.

bench = TimeframeGetSeries1("MON", 31, close, LastData);
bench = timeframecompress(bench);
bench = perf(bench, 1);
benchPerf = timeframedecompress(bench);
symPerf = timeframedecompress(timeframeapply(31, perf(close, 1)));
compare = symPerf > benchPerf;

Now i want do the same functionality, but i cant use TimeframeGetSeries1 to get apply monthly timeframe (31)
I use this instruction to get the data information for benchmark and i get daily "closeret" price for benchmark symbol "MON"
rettNav= GetData("nav_rettificati", "closeret", LastData, "MON");

But i don't understand how i can proceed to compress in monthly like this
bench = TimeframeGetSeries1("MON", 31, close, LastData);
bench = timeframecompress(bench);
bench = perf(bench, 1)

Thank you

2018-03-05 03:58:42



"TimeframeGetSeries1" only uses OHLC values and the "timeframeapply" will not work well with "GetData".
Either you create a custom function in C# to calculate the montly values of "closeret" or you simply use the daily time frame and calculate the performance using: (it isn't a problem since you are rebalancing at the end of the month)
rettNav= GetData("nav_rettificati", "closeret", LastData, "MON");
newMonth = month() != ref(month(), 1);
a = perf(rettNav, barssince(newMonth));

You can always use the chart to check the values and have a visual confirmation of the the values returned by each variable.

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