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    Largest Daily Changes in the S&P 500

    Just learnt: short selling is most probably illegal or in trouble in China http://www.business-standard.com/article/reuters/china-police-to-probe-potentially-malicious-shorting-of-stocks-xinhua-115070900082_1.html
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    The most frequently used letter in the first letter of stock symbol names

    Just for fun. I thought it is "S", but it is turned out to be "C", then "A", "S" is in the third place. Here is the full list after counting 15,000 stock symbol names. Rank Freq Letter 1 1484 C 2 1296 A 3 1264 S 4 964 P 5 912 M 6 824...
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    What impact will Chinese ADRs have on US markets?

    Considering the total market value of all Chinese ADRs in US market only takes less than 2%, I would say the impact should be minimal.
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    Fresh list of active symbols

    NYSE/NYSEMKT ftp://ftp.nasdaqtrader.com/SymbolDirectory/otherlisted.txt ACT Symbol|Security Name|Exchange|CQS Symbol|ETF|Round Lot Size|Test Issue|NASDAQ Symbol A|Agilent Technologies, Inc. Common Stock|N|A|N|100|N|A AA|Alcoa Inc. Common Stock|N|AA|N|100|N|AA AA$|Alcoa Inc. $3.75 Preferred...
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    Fresh list of active symbols

    Thanks. Checked it out. Very interesting to me. Wondering if there is a similar complete list for NYSE.
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    mother of all halts

    Shanghai listed stocks still have a median PE above 50. Should be down another 160% to around 1500 from the current 3500 to see some value.
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    FXI

    Not bad. Looking at the bigger picture. It is still very high.
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    eod data bad print problem

    There was a similar discussion on bad prints on intraday data http://www.elitetrader.com/et/index.php?threads/cleaning-intraday-data.156895/#post-2344248 I saw the similar problem occasionally when I use a lot of EOD historic data, there are quite a few of bad prints (out of band data, error...
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    Ernie Chan: Do not use data before 2009

    Dr. Chan does not like the data before 2009, so the stock market (pretended) did not exist before 2009.
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    Charting π (PI)

    It does not matter. PI is irrational and infinite sequence of digits. Up to which sub-sequence embedded in pi you use, theoretically you can get any chart you like. Like https://en.m.wikipedia.org/wiki/Multiverse, everything exists in pi, big bubble, big crash, every chart of stocks that ever...
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    confused about the market cap, shares outstanding and shares float

    complicated :(
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    confused about the market cap, shares outstanding and shares float

    Thanks. I checked it again on Google NASDAQ:GOOG, "Diluted Weighted Average Shares" on Financial's page is 689.5M as expected for computing the market cap. While bloomberg site seems removed Key Statistics. But Yahoo Financial still shows a "outstanding shares" 341.6M.
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    confused about the market cap, shares outstanding and shares float

    thanks for your reply. i saw two types of google stocks, even put them together the total 630M still far from the expected 680M around. i though "outstanding" should also include all insider hold stocks which is not reported in "float". looking at most other well established stocks like IBM, i...
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    confused about the market cap, shares outstanding and shares float

    I thought I knew well about how the market cap value of a stock is caculated util today when I tried to use "shares outstanding" to compute the market value (shares_outstanding x eod_price) for a number of stocks including FB and GOOG. FB market cap were bigger than GOOG. How? Checked...
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    Simplest way to download historical data

    yahoo gives decent free eod historical data in csv format with stock split and dividend payout information. yahoo also gives up to 5 (or 10 days) 5-min intraday data and the recent day's 1-min data in csv format for free. google gives free up-to 15 days 1-min intraday data but very bad quality...
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    Completed Python Script - CSV to PDF with Pyfpdf

    Do the reverse. Use "pdftotext". You get it.
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    Completed Python Script - CSV to PDF with Pyfpdf

    LibreOffice does already this to convert any document from and to any LibreOffice supported format including csv to pdf. Such as "unoconv -f pdf my.csv", you get my.pdf.
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    Too Many Indicators?

    I just checked my system. Ridiculously, there are 390 different indicators. Some are very simple, some quite complicated. The system learns to pick a set of reasonable indicators in analysis.
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    Big Data in Financial Prediction

    Big data by data mining and data analytics is hot in business. But it is still said hardly effective in processing financial data such as stock and option prices. Is this true or not? At least, as far as I know, there is no any publicly available good big data algorithms in stock/option trading...
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    last train leaving station

    http://www.elitetrader.com/vb/attachment.php?attachmentid=146528&stc=1&d=1401337305
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