How do I read technicals for tickers that move together but are slightly different?
"Following comments to your question here, you posted a separate question about why SPY, SPX, and the options contract don't move perfectly together.  That's here Why don't SPY, SPX, and the e-mini s&p 500 track perfectly with each other? I provided an answer to that question and will build on it to answer what I think you're asking on this question.  Specifically, I explained what it means that these are ""all based on the S&P.""  Each is a different entity, and different market forces keep them aligned.  I think talking about ""technicals"" on options contracts is going to be too confusing since they are really a very different beast based on forward pricing models, so, for this question, I'll focus on only SPY and SPX. As in my other answer, it's only through specific market forces (the creation / redemption mechanism that I described in my other answer), that they track at all.  There's nothing automatic about this and it has nothing to do with some issuer of SPY actually holding stock in the companies that comprise the SPX index. (That's not to say that the company does or doesn't hold, just that this doesn't drive the prices.)  What ever technical signals you're tracking, will reflect all of the market forces at play.  For SPX (the index), that means some aggregate behavior of the component companies, computed in a ""mathematically pure"" way.  For SPY (the ETF), that means (a) the behavior of SPX and (b) the behavior of the ETF as it trades on the market, and (c) the action of the authorized participants.  These are simply different things. Which one is ""right""?  That depends on what you want to do.  In theory you might be able to do some analysis of technical signals on SPY and SPX and, for example, use that to make money on the way that they fail to track each other.  If you figure out how to do that, though, don't post it here.  Send it to me directly. :)"
So you're 23 with no higher graduation, certificates etc which would allow you to study / training but with a high passion for logical thinking and math? Im 31 now, i was in a similar position back then when i was 23. The very best thoughts i want to throw you over: FORGET IT (AT LEAS THIS WAY) - You need cash equity (not borrowed) to even get a foot in the door (read on why) . The fact that you even consider to trade with a few hundred dollar shows how desperate you're, it would very likely result in loss, resignation and mental pain.  Let me get you a reality check: If you think you can quadruple your money within months with ease and no risk your wrong - this mindset is gambling - don't end up as gambler. To make 24K a year or 2K a month (taxes are not included) would mean 10% a month on a 20K account which would be almost impossible on a long run (show me a hedge-fund with that performance) - What do you do on draw down months - 3 months no profit would mean you're 8K behind - you wont make a living wit ha 20K account in a western civilization and normal lifestyle. Big question, how do you want to trade? Everything newsfeed / latency based is very hard to compete in. So called technical systems drawing lines, fancy indicators etc are bogus in my opinion (read taleb black swan). Trading/speculation based on fundamentals is a different animal - It to be able to do that you would need to understand the market you trade and what influences it, takes lot time, brainpower , tools ready (ugh, hard to write the picture on my mind). Im 31 years into trading now, seen so many faces come and most of them go in that time , to me it sounds like you quietly hope for a lotto ticket. To speak about hardware, ie the tools you need depends on your trading style (again a hint that a lot more study is needed. If you're really hooked, readreadread and get in touch with people - always question yourself. "I would like to first point out that there is nothing special about a self-managed investment portfolio as compared to one managed by someone else. With some exceptions, you can put together exactly the same investment portfolio yourself as a professional investor could put together for you. Not uncommonly, too, at a lower cost (and remember that cost is among the, if not the, best indicator(s) of how your investment portfolio will perform over time). Diversification is the concept of not ""putting all your eggs in one basket"". The idea here is that there are things that happen together because they have a common cause, and by spreading your investments in ways such that not all of your investments have the same underlying risks, you reduce your overall risk. The technical term for risk is generally volatility, meaning how much (in this case the price of) something fluctuates over a given period of time. A stock that falls 30% one month and then climbs 40% the next month is more volatile than one that falls 3% the first month and climbs 4% the second month. The former is riskier because if for some reason you need to sell when it is down, you lose a larger portion of your original investment with the former stock than with the latter. Diversification, thus, is reducing commonality between your investments, generally but not necessarily in an attempt to reduce the risk of all investments moving in the same direction by the same amount at the same time. You can diversify in various ways: Do you see where I am going with this? A well-diversed portfolio will tend to have a mix of equity in your own country and a variety of other countries, spread out over different types of equity (company stock, corporate bonds, government bonds, ...), in different sectors of the economy, in countries with differing growth patterns. It may contain uncommon classes of investments such as precious metals. A poorly diversified portfolio will likely be restricted to either some particular geographical area, type of equity or investment, focus on some particular sector of the economy (such as medicine or vehicle manufacturers), or so on. The poorly diversified portfolio can do better in the short term, if you time it just right and happen to pick exactly the right thing to buy or sell. This is incredibly hard to do, as you are basically working against everyone who gets paid to do that kind of work full time, plus computer-algorithm-based trading which is programmed to look for any exploitable patterns. It is virtually impossible to do for any real length of time. Thus, the well-diversified portfolio tends to do better over time." "There are different approaches, but here is what we do and what I recommend.  Now that you are officially a married couple, open a joint bank account, and eliminate your individual accounts.  There are several reasons for this. Having a joint account promotes unity and teamwork.  When you only have a joint account, you do not have ""your income"" and ""her income,"" or ""your expenses"" and ""her expenses.""  You work together in everything.  You discuss your goals and set your household budget together.  If one of you makes more money than the other, that person is no longer ""worth more,"" because your incomes are pooled together.  If one person with a higher income has more in their account than the other person does, it can lead to envy, which you do not want in your marriage. Having a joint account is more efficient and makes more sense.  With separate accounts, who pays the rent/mortgage?  Who pays the utilities, or buys the food?  If you have separate accounts, it takes a lot of work to worry about what is ""fair"" when deciding how to divide up the expenses.  With a single household budget and a joint account, you decide together what the household expenses are, and they get paid from one account.  If one of you has debt, you both have debt.  You work together to get it paid off and strengthen your financial situation in the process. Having a joint account forces you to discuss your finances together.  Working toward common financial goals together is crucial in a strong marriage, but if you maintain your separate accounts, you might be tempted to put off these discussions until you are forced to by life circumstances.  It is better to work together from the start, and joining your finances facilitates that. You are intending your marriage to last.  Live your financial life like you believe that you are a team for life.  If you live in a community property state, separate accounts are a fiction anyway; everything is treated as if it was pooled together in the event of a divorce. I understand that if you are used to having your own money, it can be difficult to give up that sole control over your income, but in my opinion, it is worth it.  You will certainly hear of examples from couples who maintain separate accounts and make it work.  In my humble opinion, combining your finances completely is easier to do right." Typically the settlement price for a financial instrument (such as AAPL stock) underlying a derivative contract is determined from the average price of trading in that instrument during some short time window specified by the exchange offering the derivative.  (Read the fine print on your contract to learn the exact date and time of that settlement period.) Because it's in an exchange's best interest to appear as fair as possible, the exchange will in general pick a high-volume period of time -- such as the close of trading on the expiry date -- in which to determine the settlement price. Now, the expiry date/time may be different from the last time at which the option can be traded, which may be different from the underlying settlement time.  For example, most US equity options currently expire on the Saturday following the third Friday of the month, whereas they can last be traded at end-of-day on the third Friday of the month, and the settlement period may be at a slightly different time on the third Friday of the month.  (Again, read the contract to know for sure.)  Moreover, your broker may demand to know whether you plan to exercise the option at an even earlier date/time. So, to answer your question: After-hours trading can only affect the settlement price of an underlying instrument if the exchange in question decides that the settlement period should happen during after-hours trading.  But since no exchange that wants to stay in business would possibly do that, the answer is no. Contract expiry time, contract exercise time, final contract trading time, and underlying settlement time may all fall at different dates/times.  The important one for your question is settlement time. I work on a buy-side firm, so I know how these small data issues can drive us crazy. Hope my answer below can help you:  Reason for price difference: 1. Vendor and data source Basically, data providers such as Google and Yahoo redistribute EOD data by aggregating data from their vendors. Although the raw data is taken from the same exchanges, different vendors tend to collect them through different trading platforms. For example, Yahoo, is getting stock data from Hemscott (which was acquired by Morningstar), which is not the most accurate source of EOD stocks. Google gets data from Deutsche Börse.  To make the process more complicated, each vendor can choose to get EOD data from another EOD data provider or the exchange itself, or they can produce their own open, high, low, close and volume from the actual trade tick-data, and these data may come from any exchanges.  2. Price Adjustment  For equities data, the re-distributor usually adjusts the raw data by applying certain customized procedures. This includes adjustment for corporate actions, such as dividends and splits. For futures data, rolling is required, and back-ward and for-warding rolling can be chosen. Different adjustment methods can lead to different price display.  3. Extended trading hours  Along with the growth of electronic trading, many market tends to trade during extended hours, such as pre-open and post-close trading periods. Futures and FX markets even trade around the clock. This leads to another freedom in price reporting: whether to include the price movement during the extended trading hours.   Conclusion To cross-verify the true price, we should always check the price from the Exchange where the asset is actually traded. Given the convenience of getting EOD data nowadays, this task should be easy to achieve.  In fact, for professional traders and investors alike, they will never reply price on free providers such as Yahoo and Google, they will most likely choose Bloomberg, Reuters, etc. However, for personal use, Yahoo and Google should both be good choices, and the difference is small enough to ignore. Cross-listing shouldn't be an issue, as the sole reason stocks would behave differently on different exchanges would be due to exchange rates (sure, noise and time differences, but weekly data should take care most of that). If you're using MSCI World index figures in USD, you either have to convert stocks denominated in other currencies to USD at their historical fx rates, or just save a lot of time and use data from stocks listed in the US, when available. "The margin money you put up to fund a short position ($6000 in the example given) is simply a ""good faith"" deposit that is required by the broker in order to show that you are acting in good faith and fully intend to meet any potential losses that may occur.  This margin is normally called initial margin.  It is not an accounting item, meaning it is not debited from you cash account.  Rather, the broker simply segregates these funds so that you may not use them to fund other trading.  When you settle your position these funds are released from segregation.   In addition, there is a second type of margin, called variation margin, which must be maintained while holding a short position.  The variation margin is simply the running profit or loss being incurred on the short position.  In you example, if you sold 200 shares at $20 and the price went to $21, then your variation margin would be a debit of $200, while if the price went to $19, the variation margin would be a credit of $200.   The variation margin will be netted with the initial margin to give the total margin requirement ($6000 in this example).  Margin requirements are computed at the close of business on each trading day.  If you are showing a loss of $200 on the variation margin, then you will be required to put up an additional $200 of margin money in order to maintain the $6000 margin requirement - ($6000 - $200 = $5800, so you must add $200 to maintain $6000).  If you are showing a profit of $200, then $200 will be released from segregation - ($6000 + $200 = $6200, so $200 will be release from segregation leaving $6000 as required). When you settle your short position by buying back the shares, the margin monies will be release from segregation and the ledger postings to you cash account will be made according to whether you have made a profit or a loss.  So if you made a loss of $200 on the trade, then your account will be debited for $200 plus any applicable commissions.  If you made a profit of $200 on the trade then your account will be credited with $200 and debited with any applicable commissions." "Treat each position or partial position as a separate LOT. Each time you open a position, a new lot of shares is created. If you sell the whole position, then the lot is closed. Done. But if you sell a partial quantity, you need to create a new lot. Split the original lot into two. The quantities in each are the amount sold, and the amount remaining. If you were to then buy a few more shares, create a third lot. If you then sell the entire position, you'll be closing out all the remaining lots. This allows you to track each buy/sell pairing. For each lot, simply calculate return based on cost and proceeds. You can't derive an annualized number for ALL the lots as a group, because there's no common timeframe that they share. If you wish to calculate your return over time on the whole series of trades, consider using TWIRR. It treats these positions, plus the cash they represent, as a whole portfolio. See my post in this thread: How can I calculate a ""running"" return using XIRR in a spreadsheet?"