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From the looks of things, I'll probably end up doing something like you suggest but it seems strange that one can't simply access the same API the charting program uses for indicators to automate trading. Here's an illustration of the problem: The white background graph is produced by a...

What you're saying is that to guarantee identity between the chart's indicators and the algorithm's indicators, I'm going to have to develop a custom charting service utilizing my calculated indicators? I seriously doubt things are that screwed up.

It is true that "either YOUR calculations are wrong, -OR- your charting software (or API) is using different calculations" and that's ignoring possible differences in data feed. The point is there are a number of ways one can end up with differences between what one sees on a chart and what...

That's not a response. I've calculated indicators myself with real time data apis. The charts must match and they don't.

I'd like to find a real time feed coupled with a charting service providing a real time API to the indicators used in the charts. In other words, I don't want to have to concern myself with any differences between what is seen on the charts and what the indicator API calls return.

Yesterday, I ran across these instances of asking prices for TVIX that appear to be glitches in the datastream. Do they represent extreme buy/sell events that are immediately remedied by high frequency traders? If so, what of the long streak at an extremely low price? (ms_ticker_timestamp...

It sounds like the first step should have been to shift the manual process to a customer-responsive charting service that offers an API so that once the manual process is replicated on the new charting service there can be confidence that the algorithm will be able to replicate its indicators...

I'm not relying on their data as the gold standard. I'm automating a manual process. Moreover, I've seen lots of claims about data feed quality and been disappointed that they weren't as good as Yahoo!'s. For instance, there are feeds that advertise real time streaming aggregation for...

I have calculated them myself -- using the python 'ta' library. As I said: The problem is when I did this, I discovered the indicators bore little resemblance to Yahoo's indicators. I, of course, assumed that I must have incorrectly called the 'ta' library's indicator methods. However, upon...

I've looked at lots of sites. As I said:

I'm automating a manual trading strategy developed by viewing Yahoo! Finance's charts, with some of their indicators. I need to find a market data source as well as algorithm source that verifiably duplicates Yahoo! Finance's "commonly used"* technical market indicators. Since my use case is...