e*e
发帖数: 6808 | 1 我穿2130
我也有这个问题，当然很轻微
但我觉得不是ITBS
到底哪些是neutral的口碑比较好的鞋子啊
我的鞋子还不到300迈，还要好久才能换呢 |
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w****1
发帖数: 4931 | 2 You can still walk in 2130, and run in neutral shoes instead. |
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M*******s
发帖数: 2630 | 3 我也有这个问题。刚才在看那个推荐asics跑鞋的帖子，比划着踩了个湿脚印，按照精
华帖里的介绍，应该算正常足，买stability的鞋。我顺道又打开了这个网站的size
chart，赫然发现我的这个足印，居然被算作是高足弓，要穿neutral的鞋。。。疑惑中
，决定后天先去店里找店员问问，再考虑买哪个类型的鞋。 |
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s********r
发帖数: 2308 | 4 我自己观察是脚外侧受力比较多，找出了几年前的特别旧的一双跑鞋，两只鞋都是向外
侧偏，所以我觉得自己确实是neutral 或者 under pronate。 这样的脚穿stability鞋
会不会雪上加霜？
刚刚贪便宜买了一双NB993，这个好像算是比较moderate的stability shoe, 可以穿么
？ |
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R*****s
发帖数: 41236 | 5 给你推荐的asics nimbus就是neutral的鞋子， 买跑鞋不要贪便宜。。
受伤了花的更多。。。 |
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q*c
发帖数: 1172 | 6 晕倒，我也买了一双，要不要去退掉？
大侠们推荐几个neutral的型号吧 |
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m******e
发帖数: 406 | 7 是不是跑得越多，姿势越正确，所以都不用穿防止内外翻的鞋了（即使以前有内外翻）
，就都不知不觉变neutral了 |
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m******e
发帖数: 406 | 8 谢谢，我是穿stable的鞋磨前外侧，就不知是under pronate，还是矫枉过正了
还没试过neutral的，下次搞双nimbus试试
不过跑多了，好像是有经历控制一下跑姿了，原来跑3mile都难的时候，光顾着喘气了
，呵呵
现在能一次搞个6，7mile，跑起来轻松了，才有时间思考跑姿了 |
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发帖数: 1 | 9 brooks,neutral, wide(D cup),
我的脚有一点点pronate,但是我穿不来stability的鞋子。。
我还是选择这个。。不知道是不是明智的选择。。 |
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M******0
发帖数: 1280 | 10 en, 你关于腿的重心我觉得是对的，儿子起拍时重心的确都是在右脚上的，无论是练
open 还是neutral. 我不懂close stance. 也许这是本质区别。 |
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M******0
发帖数: 1280 | 11 That's why I posted this. I am confused about this too. Coach said neutral
stance, never mentioned close stance. |
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b*********s
发帖数: 6757 | 12 嗯， 所以说我把open 和 neutral 搞混了。。。 |
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b*********s
发帖数: 6757 | 13 你的教练说的是对的， 你可能对close stance 的理解和我当初一样， 把close
stance 理解成neutral stance了。。。。 所以看不出什么不同。 lol |
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b**********s
发帖数: 9531 | 14 无关把，好像只是neutral 会混淆，open还是广泛接受定义的。而且open是可以把中心
从右脚移到左脚的。 |
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b*********s
发帖数: 6757 | 15 你说的open stance 是我最早说的neutral stance，左右脚基本和底线平行， 但左脚
要偏前些。 而我说的open stance是左脚相对右脚要偏后些， 在这种情况下如果你还
要把重心移到左脚的话， 你的重心是偏后拉的， 不适合。 你只能重心定在右腿上，
左脚保持位置， 打完后再把重心转到左脚。 这两种的时差在打正手该是小于1秒， 打
反手时会比较明显。 |
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a*****0
发帖数: 6788 | 16 俺的理解是
open：两脚的连线基本和底线平行
neutral：两脚的连线基本和底线45度上下
close：两脚的连线基本和底线垂直甚至cross over。
问题是中间的模糊空间很大 |
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K****D
发帖数: 30533 | 17 有没有反neutral stance的? 右手选手，右脚在前左脚在后垂直。 |
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b**********s
发帖数: 9531 | 18 这是版本1，版本2是：
open:一样
neutral:两脚的连线基本和底线垂直
close:cross over
至于45度，有人叫semi-open
说白了，就是教练们搞些花样骗钱 |
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n**u
发帖数: 768 | 19 从另外一个角度来说。 neutral stance/close stance 侧重于准/快， 必须打在角或
腰上,finish the point or follow up with a volley。 往往打这个球是站在底线内
的。 open stance 侧重于身体uncoil发力，侧重于重/转， 往往打这个球是站在底线
外的相持阶段。 |
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I*****e
发帖数: 15123 | 21 去年各大品牌流行camel颜色了好长时间，今年好像是用Maroon stance against the
neutrals的搭配。。不知如何呢 |
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k******a
发帖数: 678 | 22 室内摄影，用大光圈追求小景深，但是会曝光过度。有没有人在类似的情况下使用
Neutral density filter来解决曝光过度的问题。请问效果如何？ |
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e***e
发帖数: 3872 | 24 Neutral Tones
[Thomas Hardy, 1867]
WE stood by a pond that winter day,
And the sun was white, as though chidden of God,
And a few leaves lay on the starving sod,
—They had fallen from an ash, and were gray.
Your eyes on me were as eyes that rove 5
Over tedious riddles solved years ago;
And some words played between us to and fro—
On which lost the more by our love.
The smile on your mouth was the deadest thing
Alive enough to have strength to die; 10
And a grin of bitterness swept thereby
Like a |
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z**r
发帖数: 17771 | 26 这个协议一旦达成，基本上就是说明net neutrality完结了，这个影响还是可能会很大 |
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c********l
发帖数: 8138 | 27 除了netflix单向性比较高以外, neutral都是双向的 |
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g*****g
发帖数: 34805 | 28 Net neutrality only covers the last mile from ISP to your home.
It's important for you and bad for ISP. Without it, ISP can throttle content
providers and stir a bidding war for the bandwidth. This is not just
Netflix, it can be BitTorrent, Youtube, or any other app that uses a lot of
bandwidth. Content providers will be forced to pay up and pass down the cost
to you.
Don't forget the bandwidth is shared in your community and it's limited.
What if all Comcast video subscribers get preference? Ca... 阅读全帖 |
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T***T
发帖数: 85 | 29 请教大牛：
NEUTRAL SCATTERING是如何测定溶液中分子组装行为的，例如可以确定分子在水溶液中
组装成“rod”，但不知如何解释给出这样的结果？ 不胜感谢！合理解答的包子奉送 |
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i***0
发帖数: 37 | 30 why use neutral probability in binomial models
why?
why?
why? |
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b******k
发帖数: 58 | 31 you are supposed to use risk-neutral distribution everywhere in pricing, no? |
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n****8
发帖数: 23 | 32 It is because under risk nutrual measure, you can use risk free rate as the
discount factor for all equity derivative pricing. So it greatly reduces the
complexity of equity option pricing.
If under physical measure (risk adjusted measure), you need to use risk
adjusted rate ( rf+r*), the risk adjustment r* is changing all the time in
the market.
There is a one to one mapping from risk neutral measure to risk adjusted
measure. So the calculated prices should be the same under both measures. |
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r****t
发帖数: 10904 | 33 then I understand the 1st half of his sentence, which can be found in any
book. And his 2nd half of sentence simply restates the equivalence of "risk
neutral measure" and the "actual measure".
I guess what I do not understand is why the 1st half indicates the 2nd half,
the conclusion. |
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p********0
发帖数: 186 | 34 in some problem set, prof just assume to be 1/2.
Also if we didnot know the flat term risk free interest rate,
the p = 1/2+ 1/2*v/\sigma*sqrt(t) used in binomial can be considered risk
neutral probablity? |
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a**x
发帖数: 9 | 35 最近需要做个risk-neutral scenario generator。不知道哪位能推荐个model或者
paper？谢谢！ |
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p****w
发帖数: 21 | 36 Thanks!
Volatility futures are tradable. I phrased volatility vaguely in my previous
post to make the question simpler.
The CBOE cash volatility index (VIX) is a nonlinear function of SPX options
prices and SPX index. It is not tradable.Then my question follows: if the
underlying is a function of tradable asset prices, is that same hedging
strategy delta neutral and self financing? |
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p******i
发帖数: 1358 | 37 请自行回去复习risk neutral valuation |
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f********y
发帖数: 278 | 38 最近看Hull的书(Chapter 11)，说说我理解的Risk-neutral valuation,希望大牛指正
，毕竟这几乎是option 定价的基础。
我觉得：
首先，如果我们假定股票的历史价格不能很好的用来预测未来(就像布朗运动一样)，对
于这指股票的未来的价格走势我们基本一无所知，也就是说不知道它的分布范围,也不
能用risk的技术去计算可能的最大损失,这样我们就只能假定它未来的价格收益期望值
是risk-free interest rate.
第二，短期内如果股票的价格只有两种可能，那么根据其价格期望值能唯一确定它上升
和下降的概率．
第三，根据这个概率就能确定option的目前期望价格．
但是感觉到John Hull的书把这些倒过来写了，他先定一个riskless portfolio,然后说
因为这个portfolio是riskless的，所以必定赚risk-free interest rate（否则有
arbitrage）,然后推算option的价格．而且他这段话让人confusing:
The key reason is that we are not valuing... 阅读全帖 |
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b******n
发帖数: 637 | 39 第一，张昊的书写的很烂，但是被无数人誉为圣经，只能硬着头皮看。
Shreve对risk-neutral的数学意义诠释得很好，但是直观经济含义基本没说。 |
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l******i
发帖数: 1404 | 40 Yes, that is exactly what I mean. Risk neutral tool is only associated with
arbitrage free market, not complete market. |
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m******2
发帖数: 564 | 41 举例来说一个证券明天有五种价格abcde
如果有五个证券，在当且仅当明天它变到某个价格的时候价值为1
你又知道这五个状态证券今天的价值ABCDE
那这个证券的今天价值就是aA+bB+cC+dD+eE
并且A+B+C+D+E=1/(1+r)
则A(1+r),B(1+r),C(1+r),D(1+r),E(1+r)满足非负且和为1
它们就是所谓的Risk Neutral Probability |
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m******2
发帖数: 564 | 42 而如果这个市场上所有的证券都是这ABCDE的线性组合，或者这个市场证券的维度为五
，那么你只要找到五个线性无关的证券，就可以解出ABCDE的值，然后简单一算就可以
对任何其它证券定价了。
这就是Risk Neutral Pricing的理想思路 |
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z****i
发帖数: 406 | 43 是为什么的呀，有数学的证明而不只是解释么？
另外，这个结论是用来证futures RATE is martingale under risk neutral measure
的吧？又是怎么证的呢？ |
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w*****e
发帖数: 197 | 44 Just treat future process as a stock with a special dividend process. Then
it is not hard to see why it is martingale. But for interest rate future
like EuroDollar, I am not sure what you are saying is true in general.
Remember, anything can be a martingale, as long as you are willing to work
with a particular kind of risk neutral measure.
On the other hand, future RATE is a rather hard thing to model. You always
start with some kind of framework that works with short rate or forward rate
. I am... 阅读全帖 |
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w**********y
发帖数: 1691 | 45 我困惑了..我怎么记得discounted price of any asset is martingale under risk
neutral measure啊?
不是么? |
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g******8
发帖数: 542 | 46 affine jump diffusion model 是heston model上加入compounded poisson jump on
log price and also on volatility. 我看的几篇research paper, 比如“# B.
Eraker. (2003).# Do Stock Prices and Volatility Jump? Reconciling Evidence
from Spot and Option Prices.”，里面就说转换成risk neutral meausre的affine
jump diffusion model的结果is standard in the literature.可是我没找到起源，不
知道是怎么转换的。这里有大牛指点一下么？谢谢！ |
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l*******y
发帖数: 4006 | 47 As far as I recall, the jump process can not be replicated, so, there prob
no real "risk neutral measure". |
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r*******y
发帖数: 1081 | 48 what is the interest rate?
risk neutral prob. also depends on the interest rate ?
率是
后又
B
到一 |
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r**m
发帖数: 7 | 49 This risk neutral probability is derived from hedging, and it is just a way
to obtain the price of a call that can also be obtained by replication or
hedging. In the real work, investors are risk averse.
ris
果我
题在 |
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s******r
发帖数: 350 | 50 Risk neutral probability is simply a defined probability distribution under
which the expected price in the next moment is the current price. |
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