5 ms·

> the stock jumped about $1.50 or about 0.75 percent Sounds like the market handled the joke incredibly well if it didn't even budge 1%.

by solve 12y ago

thehoff 12y ago
Yeah, I was reading this trying to figure out if the 0.75% was a big deal (didn't seem to me offhand). Wonder how this compares to a normal trading day. edit: grammar
- theGimp 12y ago
  It's a perfectly typical change in the price but normally you look at the change relative to the market that day. I'm on mobile but essentially if all the auto companies don't move and Tesla goes up 0.75% then it's a pretty good day for Tesla. Edited to fix typo
joshu 12y ago
You can't judge the magnitude of the move just by looking at the number. You have no idea if that is giant or tiny without context.
- solve 12y ago
  Wrong. Percentage change is exactly what you look at, if you were to pick just one simple metric.
  - joshu 12y ago
    Standard deviation is the measure of typical amount of change. If you wanted to express it as a normalized z-score, that's your single number. 1% might be a .01 sigma move. It might be a 3 sigma move. Please don't present your opinions on a matter like this as if they are facts, especially when you are ill-informed.
    - solve 12y ago
      Ok, sorry my reply was too brief. What I was trying to say is: What would be the most useful single metric that a journalist could use for his audience? Z-score certainly wouldn't be that. I think that "percent change" captures the reader's imagination well, because it rather easily can be converted to an answer to the top question that a reader of a finance article is probably wondering: "What potential returns were there to be made on the market, for this event, had you had knowledge that this event was going to happen?" Otherwise, if you want to answer the reader's possible question of: "How rare is this type of movement?" I would prefer a metric of "mean time between events like this", with "events like this" having some reasonable definition, like versus previous history of this asset, or against similar assets, or against all previous April 1st movements of this asset.
      - joshu 12y ago
        I think the reader's question is: is that a big move? In which case, neither of those really answer the question. In the second you still need to compare the time period to other time periods, or you end up with "is that frequent?" Which is a very similar issue.
exit 12y ago
With about five minutes remaining in the trading day, the company posted a statement on its official website under the headline: “Announcing the Tesla Model W.” In the following minute, the stock jumped about $1.50 or about 0.75 percent from its level the moment before to as high as $188.50. Nearly 400,000 shares traded in that time, and it was the heaviest one minute of trading volume in the stock since the opening 60 seconds of trading on Feb 12. Tesla shares quickly retraced most of that upward move and ended the session at $187.59, down 0.63 percent from Tuesday’s close.
- ams6110 12y ago
  Doesn't sound like much but a 0.75% swing in 5 minutes is almost 78,000% annualized gain. Obviously swings like that don't persist for a full year but huge amounts of money can be made or lost on small swings like that which is what the algorithms try to take advantage of.
Istof 12y ago
It pretty much blends in with the 3-month stock price history... http://finance.yahoo.com/echarts?s=TSLA+Interactive#{%22range%22%3A%223mo%22%2C%22scale%22%3A%22linear%22} http://finance.yahoo.com/echarts?s=TSLA+Interactive#{%22rang...
- solve 12y ago
  If only journalists would include these long-term, y-axis at 0, price graphs when they're writing about price movements. This would kill their articles though.

> the stock jumped about $1.50 or about 0.75 percent Sounds like the market handled the joke incredibly well if it didn't even budge 1%.

by solve 12y ago

> the stock jumped about $1.50 or about 0.75 percent Sounds like the market handled the joke incredibly well if it didn't even budge 1%.

thehoff 12y ago

Yeah, I was reading this trying to figure out if the 0.75% was a big deal (didn't seem to me offhand). Wonder how this compares to a normal trading day. edit: grammar

theGimp 12y ago
It's a perfectly typical change in the price but normally you look at the change relative to the market that day. I'm on mobile but essentially if all the auto companies don't move and Tesla goes up 0.75% then it's a pretty good day for Tesla. Edited to fix typo

joshu 12y ago

You can't judge the magnitude of the move just by looking at the number. You have no idea if that is giant or tiny without context.

solve 12y ago
Wrong. Percentage change is exactly what you look at, if you were to pick just one simple metric.
- joshu 12y ago
  Standard deviation is the measure of typical amount of change. If you wanted to express it as a normalized z-score, that's your single number. 1% might be a .01 sigma move. It might be a 3 sigma move. Please don't present your opinions on a matter like this as if they are facts, especially when you are ill-informed.
  - solve 12y ago
    Ok, sorry my reply was too brief. What I was trying to say is: What would be the most useful single metric that a journalist could use for his audience? Z-score certainly wouldn't be that. I think that "percent change" captures the reader's imagination well, because it rather easily can be converted to an answer to the top question that a reader of a finance article is probably wondering: "What potential returns were there to be made on the market, for this event, had you had knowledge that this event was going to happen?" Otherwise, if you want to answer the reader's possible question of: "How rare is this type of movement?" I would prefer a metric of "mean time between events like this", with "events like this" having some reasonable definition, like versus previous history of this asset, or against similar assets, or against all previous April 1st movements of this asset.
    - joshu 12y ago
      I think the reader's question is: is that a big move? In which case, neither of those really answer the question. In the second you still need to compare the time period to other time periods, or you end up with "is that frequent?" Which is a very similar issue.

exit 12y ago

With about five minutes remaining in the trading day, the company posted a statement on its official website under the headline: “Announcing the Tesla Model W.” In the following minute, the stock jumped about $1.50 or about 0.75 percent from its level the moment before to as high as $188.50. Nearly 400,000 shares traded in that time, and it was the heaviest one minute of trading volume in the stock since the opening 60 seconds of trading on Feb 12. Tesla shares quickly retraced most of that upward move and ended the session at $187.59, down 0.63 percent from Tuesday’s close.

ams6110 12y ago
Doesn't sound like much but a 0.75% swing in 5 minutes is almost 78,000% annualized gain. Obviously swings like that don't persist for a full year but huge amounts of money can be made or lost on small swings like that which is what the algorithms try to take advantage of.

Istof 12y ago

It pretty much blends in with the 3-month stock price history... http://finance.yahoo.com/echarts?s=TSLA+Interactive#{%22range%22%3A%223mo%22%2C%22scale%22%3A%22linear%22} http://finance.yahoo.com/echarts?s=TSLA+Interactive#{%22rang...

solve 12y ago
If only journalists would include these long-term, y-axis at 0, price graphs when they're writing about price movements. This would kill their articles though.