Archive for the ‘Tech’ Category
Anything to do with programming, the web, gadgets, etc.
There is no such thing as ‘multitasking’ [RANT]
Posted by DK on January 28, 2010
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The iPad was not made for you!
Posted by DK on January 28, 2010
And that's why devices like the iPhone and iPad are kicking ass. I don't understand posts that ask "What's the point of the iPad?" What's the point of the Kindle then? That defunct CrunchPad/Joo Joo Bear thing? Or any other mobile device? Of course there are other devices that can do everything the iPad does. I could also lug my iMac around like that guy who plays WoW at Panera with a MiFi hotspot and a car battery. Apple is striking a chord in the marketplace (as judged by its market capitalization and cash balance) because it has the ability to make tradeoffs that ultimately help define the product. It understands that 90% of the people are going to spend 80% of their time on these devices CONSUMING media, not creating it. And for the 20% of the time you need to shoot off an email, edit a document, or update your facebook status? Well, you can do that too…likely with ease. And finally, while Apple's marketshare is still small, it's now large enough to exert some buying power on it's suppliers. Putting out something like the iPad likely wasn't done earlier because achieving the needed price point wasn't feasible. So, yes, I agree the iPad is a bloated iPhone, but without the phone and camera. But it does come with a bigger screen, so you can enjoy your media a bit more and be a little more productive while you're on the road. Apple's formula is taken straight out of the Clairol playbook: Nice 'n Easy, That's My Style! Those of you that love your three monitor setup and, even now, are plotting to get that python interpreter running on the iPad? I'm sorry, but the iPad was not made for you.
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iPad is going to eat Kindle’s lunch, and then kick sand in his face
Posted by DK on January 27, 2010
I bought my wife a Kindle as an anniversary gift last year (yeah, I know real romantic). Both of us have used it a fair amount, but I ended up reading my books via the iPhone Kindle app. The touchscreen interface makes reading much more intuitive, page turns are smoother, and bookmarking is much easier. I also invert the screen contrast so the letters are white and the screen is black (makes late night reading a bit less annoying for my better half). Now, I really can't stand to read on the Kindle anymore. The only thing nice about it is the Amazon Whispernet service, which the Kindle app obviously also uses. The only downside about the iPhone is the screen size. For novels, I don't really mind, but for reference books, the small screen can really mess with the formatting of exhibits, charts, etc. Well, the iPad rectifies the screen issue (and then some, according to all the bloggers that attended the event). The iPad isn't really that much more expensive than a Kindle either. It certainly is more versatile. Anyway, I sort of feel bad for Bezos. He did a good thing with the Kindle — Apple is just leveraging it's IP too well now. We'll have to see how the productivity side of the iPad stacks up (particularly with no multitasking allowed), but from an eReader perspective, iPad is the new king of the hill. I mean, really, are you going to buy a Nook?
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Three Documentaries
Posted by DK on January 26, 2010
- Harvard Beats Yale 29-29. My initial reaction to this title was similar to my reaction to my cable operator offering an Ivy League basketball package. Who could possibly care? Netflix proved me wrong. I still have no interest in Ivy League basketball, but Harvard Beats Yale 29-29 was surprisingly good. The ending is as action packed as any big-time game you've seen, and the fact that the players (now old white guys) can talk about the game with a refreshing amount of mature perspective makes this film a bit different (and more enjoyable) than your typical sports documentary. One other thing: Tommy Lee Jones is weird.
- Tyson. I'm a boxing fan. Whatever you think of Iron Mike, he was one of the most compelling figures in the sport for most of our adult lives. This film was more artsy than I thought it would be, with Tyson providing an almost stream-of-consciousness commentary about his life. The chaos draws you in. Interesting stuff, particularly if you are a boxing fan.
- Who the #$&% Is Jackson Pollock? This movie definitely wasn't on my radar screen, but my wife turned it on. Why not? The film describes how a female truck driver happens upon a potential Pollock painting and her quest to get it authenticated. She is, of course, rebuffed by the art intelligentsia. Drama ensues!
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Monte carlo and fundamental analysis
Posted by DK on January 22, 2010
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Holy Schnikes! Script GUIs with Sikuli
Posted by DK on January 22, 2010
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A moth to the flame
Posted by DK on January 20, 2010
*(note to , I am simply paraphrasing the movie “Gladiator” and not actually threatening AT&T. do not send FBI. Baby is sleeping)
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Synthetic tranches intuition for stock option guys
Posted by DK on January 9, 2010
- Call spread A = long call option with a strike of $0, short a call with a strike of $3.
- Call spread B = long call option with a strike of $3, short a call with a strike of $7.
- Call spread C = long at $7, short at $10.
- Call spread D = long at $10, short at $15.
- Call spread E = long at $15, short at $30.
- Call spread F = long at $30, short at $100 (I know we've limited the stock to $100, but work with me here).
Let's say the index trades at around $1.50. Call spread A is most sensitive to changes in the index price (relative to the other call spreads) since it is "at-the-money" (ATM). In contrast, the $30-$100 spread offers little value since it is so far "out-of-the-money" (OTM). If the stock price increases to $5, call spread A has moved completely "in-the-money" (ITM) and is no longer as sensitive to moves in the underlying index (the maximum PnL for the spread has been realized). Call spread B is now the ATM option portfolio. As the index price moves, the value of each call spread will fluctuate depending on whether it is ITM, ATM, or OTM. Another way to look at it is in terms of option premium. If the index is trading at $1.50, I'll likely get much more premium by selling call spread A or B than call spread F.
Now let's consider the constituents of this index. Let's say it's made up of biotech companies that are highly dependent upon a certain upstream compound, pending FDA approval, for their businesses to succeed. If the compound is approved, these companies are going to make tons of money and the value of the index will likely approach $100. If it is not approved, the value of the index will approach $0. Your estimate of the compound's likelihood of approval will bias your estimate of call spread relative value. If you think approval is more likely than expected, you may be able to purchase the $30-100 call spread cheaply since it's OTM. If enough people agree with you, the premium associated with the $30-100 call spread will be driven higher until it reaches some equilibrium level. This reflects the binary nature of the approval process and the highly correlated expected returns of the index constituents. The example would be much different if the index was made up of a well-diversified group of companies, spanning different sectors, etc. Some constituent stocks will go up and some will go down, but one might expect the distribution of potential index values to approach something more bell-curved than the binary outcome described in the biotech example. In this case, the value of the $30-100 call spread will remain low since the index probably won't generate those higher expected returns (again, relative to the biotech example). Now stop. Replace the "$" signs in the example above with "%", generalize the "biotech vs. diversified" discussion in your head to correlated vs. uncorrelated, and substitute "expected loss" for "expected return." You officially understand standardized synthetic tranches. Tranches on the standard CDX index work in exactly the same manner. The expected loss of the index is tranched into 0-3%, 3-7%, etc., slices. If the index is implying a loss of 1.5%, for example, the 0-3% tranche is the ATM tranche. The intuition regarding the greeks, discussed in previous posts, follows naturally (delta, gamma, rolldown/theta, vega/correl01). One common stumbling block is the whole expected return vs. expected loss business. To be explicit, credit guys are primarily concerned with expected loss (default risk) whereas equity guys are focused on expected return. If I buy protection on the 0-3% tranche, I expect default risk to increase. When I buy the $0-3 call spread, I expect the stock price to increase. So remember, when you talk about CDS, you should talk explicitly in terms of buying and selling protection.- Buy protection = I expect things to get crappier (I want to short the credit)
- Buy call option = I expect things to improve (I want to get long the stock)
So from a directional perspective (crappier <–> better), I suppose buying tranche protection is more like buying a put spread on a stock/index. For whatever reason, though, I prefer to think of it as buying a call spread on expected loss. This preference is driven by the quoting conventions of credit vs. stocks. CDS is quoted in spread (which reflects default risk) while stocks are quoted in terms of price.
The same term structure considerations are also applicable, though one should remember CDS maturities (e.g. 5, 7, 10y) are much longer than equity options.Anyway, there are direct lines one can draw between stock options and standard synthetic tranches. Hopefully this helps bridge the gap. And for something totally unrelated, here's a link to an oldie but goodie:
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Giz summarizes the CES-related news deluge
Posted by DK on January 8, 2010
The press releases and blog posts are coming fast and furious from the CES show. If you don't have the patience to follow all the announcements, you might save yourself some trouble by visiting The Best of CES care of Gizmodo. Just a thought.
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