What is “beta” for an investment or a portfolio, and how do I use it?
Beta is an indication of a Stock's risk with respect to the market.  For instance if a stock had a beta of 1 it means it is in tandem with the S&P 500. If it is more than 1, the stock is volatile.  If it is less than 1, it implies market movement doesn't affect this stock much. Tech stocks and small cap stocks have high beta, utilities have low beta. (In general, not always). Hope this helps - I've tried to explain it in very simple terms! "In addition to individual stocks, your entire portfolio will also have a beta.  It would be equal to the weighted sum of the individual asset betas  So a beta portfolio of 1 would have approximate risk equal to a market index. You would use this to construct a risk level that you were comfortable with, given the expected return of the individual assets.  You are also interested in obtaining a high level of ""alpha"" which means that your portfolio is earning more than what would be expected, given it's level of risk." I don't think either of these answers are accurate. A beta of 0 means that your stock/portfolio does not change accordingly or with the market, rather it acts independent. A beta above 0 means the stock follows what the market does. Which means if the market goes up the stock goes up, if the market goes down, the stock goes down. If the stock's beta is more than 1 the stock will go up more if the market goes up, or go down more if the market goes down. Inversely if the stock is less than 0 the stock will follow the market inversely. So if the market goes up, the stock goes down. If the market goes down, the stock goes up. Again a greater negative beta, the more this relationship will be exaggerated.
"The question you should be asking yourself is this: ""Why am I putting money into a 401(k)?"" For many people, the answer is to grow a (large) nest egg and save for future retirement expenses. Investors are balancing risk and potential reward, so the asset categories you're putting your 401(k) contribution towards will be a reflection on how much risk you're willing to take. Per a US News & World Report article: Ultimately, investors would do well to remember one of the key tenants   of investing: diversify. The narrower you are with your investments,   the greater your risk, says Vanguard's Bruno: ""[Diversification]   doesn't ensure against a loss, but it does help lessen a significant   loss."" Generally, investing in your employer's stock in your 401(k) is considered very risk. In fact, one Forbes columnist recommends not putting any money into company stock. FINRA notes: Simply stated, if you put too many eggs in one basket, you can expose yourself to significant risk. In financial terms, you are under-diversified: you have too much of   your holdings tied to a single investment—your company's stock.   Investing heavily in company stock may seem like a good thing when   your company and its stock are doing well. But many companies   experience fluctuations in both operational performance and stock   price. Not only do you expose yourself to the risk that the stock   market as a whole could flounder, but you take on a lot of company   risk, the risk that an individual firm—your company—will falter or   fail. In simpler terms, if you invest a large portion of your 401(k) funds into company stock, if your company runs into trouble, you could lose both your job AND your retirement investments. For the other investment assets/vehicles, you should review a few things: Personally, I prefer to keep my portfolio simple and just pick just a few options based on my own risk tolerance. From your fund examples, without knowing specifics about your financial situation and risk tolerance, I would have created a portfolio that looks like this when I was in my 20's: I avoided the bond and income/money market funds because the growth potential is too low for my investing horizon. Like some of the other answers have noted, the Target Date funds invest in other funds and add some additional fee overhead, which I'm trying to avoid by investing primarily in index funds. Again, your risk tolerance and personal preference might result in a completely different portfolio mix." Good question. There are plenty of investors who think they can simply rely on intuition, and although luck is always present it is not enough to construct a proper portfolio. First of all there are two basic types of portfolio management: Passive and Active. The majority of abnormal gains are made with active portfolio management although passive managers are less likely to suffer loses.  Both types must be created with some kind of qualitative and quantitative research, but an active portfolio requires constant adjustments (Market Timing) to preserve the desired levels of risk and return.  The topic is extremely broad and every manager has his own preferred methods of quantitative analysis. I will try to list here some most common, in my opinion, ways of stock-picking and portfolio management. Roy's Criterion: The best portfolio is that with the lowest probability that the return will be below a specified level.  This is achieved by maximising the number of standard deviations between the return on the portfolio and minimum specified level: Max k = (Rp-Rl)/Sp Where (Rp) - return on portfolio, (Rl) - specified minimum return, (Sp) - standard deviation of portfolio return. Kataoka's Criterion: Maximise the minimum return (Rl) subject to constraint that the chance of a return below (Rl) is less than or equal to a specified value (a). Maximise (Rl) Subject to Prob (Rp < Rl) =< a For example, assume that the specified value is 20% - this will be met provided (Rl) is at least 0.84 standard deviations below (Rp). Therefore the best portfolio is the one that maximises (Rl) where: Rl = Rp-0.84*Sp Telser's Criterion: Maximise expected return subject to the constraint that the chance of a return below the specified minimum is less than or equal to some specified minimum (a) Maximise (Rp) subject to Prob (Rp < Rl) =< a Assuming same data as previously:  Rl =< Rp-0.84*Sp and select the portfolio with highest expected return. Security Selection Now let's look at some methods of security selection. This is important when a manager believes some shares are mispriced. The required return on security 'i' is given by: Ri = Rf+(Rm-Rf)Bi Where (Rf) - is a risk-free rate, (Rm) - return on the market, (Bi) - security's beta. The difference between the required return and the actual return expected is known as the security's alpha (Ai). Ai = Rai - Ri, where (Rai) is actual return on security 'i'. Stock Picking One way of stock-picking is to select portfolios of securities with positive alphas. Alpha of a portfolio is simply the weighted average of the alphas of the securities in the portfolio. Ap = {(n*Ai) Where ({) is sigma (sorry for such weird typing, haven't figured out yet how to type proper-looking formulas), (n) - share of 'i'th security in portfolio. So another way of stock-picking is ranking securities by their excess return to beta (ERB): ERB = (Ri - Rf)/Bi The greater the ERB the more desirable the security and the greater the proportion it will make up of the portfolio. Thus portfolios produced by this technique will have greater proportion of some securities than the market portfolio and lower proportions of other securities.  The number of securities depends on a cut-off rate (C*) for the ERB, defined so that all securities with ERB>C* are included in portfolio while if ERB  The cut-off rate for a portfolio containing the first 'j' securities is given by (i'm inserting an image cut from Word below):  Here comes the tricky part: Basically what you do is first calculate ERB for each security, then calculate Cj for each security mix (gradually adding new securities one by one and recalculating Cj each time). Then you select an optimum portfolio by comparing Cj of each mix to ERB's of it's securities. Let me show you a simple example: Say you have securities A,B,C and D you calculated ERB's: ERB(a)=6, ERB(b)=6.5, ERB(c)=5, ERB(d)=4 also you calculated: C(a)=4.1, C(ab)=4.8, C(abc)=4.9, C(abcd)=4.5. Then you check: ERB(a),ERB(b),ERB(c) are greater than C(a), but C(a) only contains security A so C(a) is not an optimum mix. ERB(a),ERB(b),ERB(c) are greater than C(ab), but C(ab) only contains securities A and B ERB(a),ERB(b),ERB(c) are greater than C(abc), and C(abc) contains A B and C so it is an optimum. ERB(d) is lower than C(abcd) so C(abcd) is not an optimum portfolio. Finally the most important part: Below is a formula to find the share of each security in the portfolio:  Here you simply plug in already obtained values for each security to find it's proportion in your portfolio. I hope this somehow answers your question, however there is a lot more than this to consider if you decide to manage your portfolio yourself. Some of the most important areas are:  Market Timing Hedging Stocks vs Bonds  Good luck with your investments! And remember, the safest portfolio is the one that replicates the Global Market.  The cut-off rate for a portfolio containing the first 'j' securities is given by (i'm inserting an image cut from Word below):  Here comes the tricky part: Basically what you do is first calculate ERB for each security, then calculate Cj for each security mix (gradually adding new securities one by one and recalculating Cj each time). Then you select an optimum portfolio by comparing Cj of each mix to ERB's of it's securities. Let me show you a simple example: Say you have securities A,B,C and D you calculated ERB's: ERB(a)=6, ERB(b)=6.5, ERB(c)=5, ERB(d)=4 also you calculated: C(a)=4.1, C(ab)=4.8, C(abc)=4.9, C(abcd)=4.5. Then you check: ERB(a),ERB(b),ERB(c) are greater than C(a), but C(a) only contains security A so C(a) is not an optimum mix. ERB(a),ERB(b),ERB(c) are greater than C(ab), but C(ab) only contains securities A and B ERB(a),ERB(b),ERB(c) are greater than C(abc), and C(abc) contains A B and C so it is an optimum. ERB(d) is lower than C(abcd) so C(abcd) is not an optimum portfolio. Finally the most important part: Below is a formula to find the share of each security in the portfolio:  Here you simply plug in already obtained values for each security to find it's proportion in your portfolio. I hope this somehow answers your question, however there is a lot more than this to consider if you decide to manage your portfolio yourself. Some of the most important areas are: Good luck with your investments! And remember, the safest portfolio is the one that replicates the Global Market. "Leverage here is referring to ""financial leverage"". This is the practice of ""levering"" [ie increasing, like the use of a lever to increase the amount of weight you can lift] the value of your investment by taking on debt.  For example: if you have 100k in cash, you can buy a 100k rental property. Assume the property makes 10k a year, net of expenses [10%]. Now assume the bank will also give you a 100k mortgage, at 3%. You could take the mortgage, plus your cash, and buy a 200k rental property. This would earn you 20k from the rental property, less 3k a year in interest costs [the 3%]. Your total income would be 17k, and since you only used 100k of your own money, your rate of return would now be 17% instead of 10%. This is financial leveraging. Note that this increases your risk, because if your investment fails not only have you lost your own money, you now need to pay back the bank. ""Beta riders"" appears to be negative commentary on investors who use Beta to calculate the value of a particular stock, without regard to other quantitative factors. Therefore ""leveraged beta riders"" are those who take on additional risk [by taking on debt to invest], and invest in a manner that the author would perhaps considered ""blindly"" following Beta. However, I have never seen this term before, and it appears tainted by the author's views on Quants. A ""quant process driven discipline"" appears to be positive commentary on investors who use detailed quantitative analysis to develop rules which they rigorously follow to invest. I have never seen this exact phrasing before, and like the above, it appears tainted by the author's views on Quants. I am not providing any opinion on whether ""beta riding"" or ""quant processes"" are good or bad things; this is just my attempt to interpret the quote as you presented it. Note that I did not go to the article to get context, so perhaps something else in the article could skew the language to mean something other than what I have presented." "There's already an excellent answer here from @BenMiller, but I wanted to expand a bit on Types of Investments with some additional actionable information. You can invest in stocks, bonds, mutual funds (which are simply   collections of stocks and bonds), bank accounts, precious metals, and   many other things. Discussing all of these investments in one answer   is too broad, but my recommendation is this: If you are investing for   retirement, you should be investing in the stock market. However,   picking individual stocks is too risky; you need to be diversified in   a lot of stocks. Stock mutual funds are a great way to invest in the   stock market. So how does one go about actually investing in the stock market in a diversified way? What if you also want to diversify a bit into bonds? Fortunately, in the last several years, several products have come about that do just these things, and are targeted towards newer investors. These are often labeled ""robo-advisors"". Most even allow you to adjust your allocation according to your risk preferences. Here's a list of the ones I know about: While these products all purport to achieve similar goals of giving you an easy way to obtain a diversified portfolio according to your risk, they differ in the buckets of stocks and funds they put your money into; the careful investor would be wise to compare which specific ETFs they use (e.g. looking at their expense ratios, capitalization, and spreads)." There isn't really a correct answer. The 1 year beta will capture any recent changes in the firm's business, but it is estimated less accurately due to fewer data points. But a beta of 0.22 for a distressed firm is very suspicious, since we would expect the stock to be more risky, not less. As a 22 year old planning for your financial life, it is obvious to say that saving as much as you can to invest for the long run is the smartest thing to do from a financial point of view.  In general, at this point, aged 22, you can take as much risk as you'll ever will. You're investing for the very long term (+30/+40 years). The downside of risk, the level of uncertainty on returns (positive or negative), is most significant on the short term (<5years). While the upside of risk, assuming you can expect higher returns the more risk you take, are most significant on the long term.  In short: for you're financial life, it's smart to save as much as you can and invest these savings with a lot of risk.  So, what is smart to invest in? The most important rule is to keep your investment costs as low as possible. Risk and returns are strongly related, however investment costs lower the returns, while you keep the risk. Be aware of the investment industry marketing fancy investment products. Most of them leave you with higher costs and lower returns. Research strongly suggests that an lowcost etf portfolio is our best choice. Personally, i disregard this new smart beta hype as a marketing effort from the financial industry. They charge more investment costs (that's a certain) and promise better returns because they are geniuses (hmmm...). No thanks. As suggested in other comments, I would go for an low cost (you shouldn't pay more than 0.2% per year) etf portfolio with a global diversification, with at least 90% in stocks. Actually that is what I've been doing for three years now (I'm 27 years old). It depends on what you are looking for in the investment. Sharpe is generally used when you are choosing among portfolios(mutual funds, hedge funds, ETFs, etc.) to be the optimal risky portfolio. Treynor is typically used when deciding which security will be added to your portfolio. And the information ratio (alpha/residual standard deviation) is used when deciding which one you will add to a passive portfolio. Also don't forget, when analyzing a stock you need to look at the fundamentals. I hope this helps. And correct me if I'm wrong any you more experienced guys. Variance of a single asset is defined as follows: σ2 = Σi(Xi - μ)2 where Xi's represent all the possible final market values of your asset and μ represents the mean of all such market values.  The portfolio's variance is defined as σp2 = Σiwi2σi2 where, σp is the portfolio's variance, and wi stands for the weight of the ith asset.  Now, if you include the borrowing in your portfolio, that would classify as technically shorting at the borrowing rate. Thus, this weight would (by the virtue of being negative) increase all other weights. Moreover, the variance of this is likely to be zero (assuming fixed borrowing rates). Thus, weights of risky assets rise and the investor's portfolio's variance will go up. Also see, CML at wikipedia.