R*****0
发帖数: 146 | 1 First let's start with original Gamma distribution.
MLE: It is not hard to see the sufficient statistics are the 'mean' and the
'mean of log(data)'. The MLE for shape is accessible using Newton method.
Moment Method: Quite straightforward -> mean = shape*scale, var = shape*(
scale)^2.
However, truncated Gamma, if I get it, is much difficult even if you know
the interval [a,b] for truncation. The density function will have the form g
(x;shape,scale)/[G(b;shape,scale)-G(a;shape,scale)] on [a,b]. S... 阅读全帖 |
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a***g
发帖数: 2761 | 2 如果变量没有包含到合同终结的时候或者说到目前为止执行合同有多长时间
那么这是一个double truncated的数据
但是不是truncated数据都需要用survival model的 |
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c********h
发帖数: 330 | 3 没有具体做过这样的glm，但是如果zero的时候出问题，有zero-inflated和zero-
truncated model。你这个是actual under-dispersion at zero，考虑下zero-
truncated？ |
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c***d
发帖数: 70 | 4 用EM algorihtm计算一个truncated normal distribution TN(mu,sigma,[xlow,+inf])
，发现加了lower bound xlow这个参数后，不收敛，如果把这个参数当已知参数会收敛
。请问EM为什么在truncated distribution上不收敛？试了最简单的uniform
distribution好像也不行。需要满足哪些regularity conditions才收敛呢？
谢谢 |
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c**i
发帖数: 6973 | 5 (A) Yesterday I did not have time to read the report carefully. I left the
library before I read your reply. Indeed on my way home, I had the same
thought as you. Please note that I am no better than you in terms of
military knowledge.
(1) "Nearly all aircraft are propelled by airbreathing jet engines, and most
of the airbreathing jet engines that are in use are turbofan jet engines
which give good efficiency at speeds just below the speed of sound."
jet engine
http://en.wikipedia.org/wiki/Jet_e... 阅读全帖 |
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w*********g
发帖数: 30882 | 6 台湾网友YST：虎年新春看天下大势：中美博弈 [复制链接]
串个门 加好友 打招呼 发消息 lypyh1166 当前离线
名誉4349 点在线时间411 小时金币9007 个贡献0 点珠宝0 颗最后登录2011-8-2注册时
间2008-11-18主题4046精华52积分8853阅读权限150帖子4267 lypyh1166 版主
积分8853精华52帖子4267 电梯直达 楼主
发表于 2010-4-9 13:22:45 |只看该作者 |倒序浏览
一键分享QQ空间新浪微博腾讯微博开心网天涯人人网百度空间豆瓣网
虎年新春看天下大势：中美博弈（上）
2010/03/25 00:00:50
在论述经济问题之后，我们进入虎年新春论政最重要的话题，那就是「中美博弈」。
经济问题是核心也是一切问题的诱因，中美博弈则是所有诱发问题中最重要也是最现实
的政治表象。
如果你还不能体会到「中美博弈」的重要性的话，那麽 YST就把话说得白一点：
「中美博弈」将导致世界政治从单极进入多极。
所谓「多极」绝不是止只有中美二极，而是中、美、欧、俄、巴西、印度．．．的多极
世界。
如果你仍然不能感觉到... 阅读全帖 |
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p********1
发帖数: 2785 | 7 User:ParisaprilFrom Wikipedia, the free encyclopediaJump to: navigation,
search [edit] Ping Fu Controversy[edit] SummaryPing Fu is a Chinese American
business woman, currently resides in the United States. She is the co-
founder and CEO of Geomagic, a 3D software company. Her memoir "Bend, Not
Break - A Life in Two Worlds" described her journey from China's Cultural
Revolution to a high tech CEO in America. However, upon the memoir
publication, a major controversy erupted over the author's depic... 阅读全帖 |
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c*9
发帖数: 3241 | 8 From: "wq" View Contact Details Add Mobile Alert
Subject: Re: I am back and need your contact info
To: "Hanlin Li" , r******[email protected], "Jin Ya" <
j*******[email protected]>, "sun wei"
Date: Mon, 12 Dec 2005 13:35:20 +0800
so glad to hear from u from shanghai.
my cell: 13600072567
PF: 13570066776
contact u later, see u.
On Sat, 10 Dec 2005 18:06:27 -0800 (PST)
Hanlin Li wrote:
> Dear piglets,
>
> I am back in China. It... 阅读全帖 |
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c*9
发帖数: 3241 | 9 From: "wq" View Contact Details Add Mobile Alert
Subject: Re: I am back and need your contact info
To: "Hanlin Li" , r******[email protected], "Jin Ya" <
j*******[email protected]>, "sun wei"
Date: Mon, 12 Dec 2005 13:35:20 +0800
so glad to hear from u from shanghai.
my cell: 13600072567
PF: 13570066776
contact u later, see u.
On Sat, 10 Dec 2005 18:06:27 -0800 (PST)
Hanlin Li wrote:
> Dear piglets,
>
> I am back in China. It... 阅读全帖 |
|
W*****e
发帖数: 7759 | 10 【 以下文字转载自 Stock 讨论区 】
发信人: iPeople (iPeople), 信区: Stock
标 题: A股美股
发信站: BBS 未名空间站 (Sat Aug 22 23:45:10 2015, 美东)
上周四大跌后写了这么几句，觉得婆婆妈妈啰里啰唆，纠结着没有在版上发，发给了几
个朋友。现在发可能也不太晚，算是给有缘之人提个醒吧。
七月初提醒过，市场挤空，纳指新高，其它的指数没有就是个很大的警讯。
http://www.mitbbs.com/article_t0/Stock/36257739.html
美股大跌，SPX直接跌破颈线2040，我从上半年就看衰美股，认为美股筑顶明显，这一
年多来都是在高位震荡出货，401K就是bag holder。 现在看来全球股市在A股美股的带
领下要走一波熊市。 A股早已进入熊市了。美股也不远了。
永远不要低估市场的志存高远，曾经历尽艰辛把SPX从666点推至2100历史高点以上，这
次花了这么大力气做了个圆弧大顶，又岂会浅尝而止。
A股是震荡的熊皮市，人气已经溃散，制度设计有重大缺陷，当然只是对散户不利，对
庄家和机构是贴心的... 阅读全帖 |
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o**********e
发帖数: 18403 | 11 【 以下文字转载自 SanFrancisco 讨论区 】
发信人: onetiemyshoe (onetiemyshoe), 信区: SanFrancisco
标 题: 感觉被老板歧视了而且还想让我背黑锅怎么办？ (转载)
发信站: BBS 未名空间站 (Sun Nov 22 10:32:43 2015, 美东)
发信人: SYSDP (SYSOP), 信区: JobHunting
标 题: 感觉被老板歧视了而且还想让我背黑锅怎么办？ (转载)
发信站: BBS 未名空间站 (Sat Nov 21 00:47:13 2015, 美东)
发信人: SYSDP (SYSOP), 信区: Working
标 题: 感觉被老板歧视了而且还想让我背黑锅怎么办？
发信站: BBS 未名空间站 (Sat Nov 21 00:26:15 2015, 美东)
我们组一个年轻的白人4级软工，一个年老的白人4级软工，一个年轻的白人3级软工，
我、烙印、巴西人自称是棕色人种的是2级软工，一个黑人小弟是1级软工，另外还有一
个offshore的烙印是contractor
我们用的一个收费的ETL软件由于授... 阅读全帖 |
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s*x
发帖数: 8041 | 13 这个英国人1999年提出的概念，把微波打入一个两边面积大小不同的真空腔（形状是个
Truncated cone），让电磁波在两个面不断反射就能产生动力，也就是无功质发动机。
刚开始大家都觉得这是搞笑的，因为这东西不符合动量守恒和牛顿第三定律啊，没东西
喷出来推动，这东西怎么能有动力？基本就是民科，伪科学一堆儿的。
没想到后来西工大真的按照这设计做了一个真空腔，输入微波，结果怎么着？真的有输
出推力！这就有意思了。后来NASA和德国人也做了实验，好像的确是有动力输出，但也
是不知道这动力到底哪儿来的，因为这东西本来就不应该好使啊。
最近查了一下进展，发现COMSOL的人做了一些模拟，提出一个设想---这东西还是发射
出了功质的，不过大家都测不到，因为是相位正好相反的光子对---我勒个去，这东西
越来越有意思了，跟真空和引力的基本性质都扯上关系了。
现在看来有点不像是伪科学了，只是大家还没搞明白这东西到底是怎么动的。如果真的
能应用到工程，那将是宇航动力的革命。下面的是最近发在AIP上的paper
http://scitation.aip.org/content/aip/journal/a... 阅读全帖 |
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M******a
发帖数: 6723 | 14 【 以下文字转载自 Mod_CHN_Hist 讨论区 】
发信人: Mayingba (吳鐘學), 信区: Mod_CHN_Hist
标 题: 奉天兵工厂
发信站: BBS 未名空间站 (Sun Jan 28 20:29:57 2018, 美东)
https://wwiiafterwwii.wordpress.com/2017/04/03/mukden-arsenal-after-wwii/
Mukden Arsenal after WWII
April 3, 2017 jwh19752 Comments
(Zhang's Gate, the old entrance to Mukden Arsenal)
For people interested in Japanese firearms of WWII, the name Mukden Arsenal
is familiar. The history of the facility after Japan's defeat is less well
known. Under various names, it did surv... 阅读全帖 |
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s********i
发帖数: 17328 | 16 The White House plans to roll out tariffs Friday on a truncated list of
Chinese exports, three sources familiar with the matter told CNBC.
The list is expected to include between 800 and 900 products, compared with
the original list of about 1,300 products published by the U.S. trade
representative in April. The dollar value of the goods the Trump
administration expects to target is unclear.
★ 发自iPhone App: ChinaWeb 1.1.4 |
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w********2
发帖数: 632 | 17 In large games, such as chess (b ≈ 35, d ≈ 80)1 and especially Go (b ≈
250, d ≈ 150)1, exhaustive search is infeasible2,3, but the effective
search space can be reduced by two general principles. First, the depth of
the search may be reduced by position evaluation: truncating the search tree
at state s and replacing the subtree below s by an approximate value
function v(s) ≈ v*(s) that predicts the outcome from state s. This approach
has led to superhuman performance in chess4, checkers5 and oth... 阅读全帖 |
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发帖数: 1 | 18 NM Delete From 可以恢复的,没commit, 不是Truncate, Drop, 就算是后者, 都还可以
用backup找回来. |
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发帖数: 1 | 19 恢复需要时间 业务停一分钟都损失很多
：NM Delete From 可以恢复的,没commit, 不是Truncate, Drop, 就算是后者, 都还可
以用backup找回来. |
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z****g
发帖数: 3509 | 20 https://www.nytimes.com/2020/02/20/opinion/sunday/coronavirus-china-cause.
html
Why Did the Coronavirus Outbreak Start in China?
Let’s talk about the cultural causes of this epidemic.
Yi-Zheng Lian
By Yi-Zheng Lian
Mr. Lian is a former chief editor of the Hong Kong Economic Journal and a
contributing Opinion writer.
Feb. 20, 2020
A civet, the wild quadruped believed to have passed on the SARS virus to
humans, in Wuhan, China, in 2003.
A civet, the wild quadruped believed to have passed on the SA... 阅读全帖 |
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E*V
发帖数: 17544 | 22 这是Amazon上Lin的评论。存在这里做个纪念：
As a Chinese, I lived through that period of time in China. I have similar
family and educational background as hers and suffered during Culture
Revolution as a child. I think her experiences in China mostly, if not all,
are fabricated, imagined, overly exaggerated or deliberately miss leading.
If one just read the media reports about her book, he/she may think that
media might just pick the sensational parts of the book and exaggerated a
little bit to help her to sell ... 阅读全帖 |
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l****z
发帖数: 29846 | 23 September 20, 2011
By Robert Gelinas
The decision of who will become the next president of the United States will
be made long before November of 2012. After the current president's most
recent tour de farce before a joint session of Congress, it is rapidly
becoming a foregone conclusion who it's not going to be.
The Obama-adoring New York Times concedes that their manufactured politician
may be in deep trouble as his own base begins to abandon him. Independents
have already done so. The righ... 阅读全帖 |
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a**e
发帖数: 8800 | 24 [Benjamin Solomon "Ben" Carson, Sr. (September 18, 1951)] Source: LYBIO.net
Thank you so much. Mr. President, Mr. Vice President, Mrs. Obama,
distinguished guests – which included everybody. Thank you so much for this
wonderful honor to be at this stage again. I was here 16 years ago, and the
fact that they invited me back means that I didn’t offend too many people,
so that was great. [LAUGHTER]
I want to start by reading four texts which will put into I want to start by
reading four texts which... 阅读全帖 |
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a***s
发帖数: 5417 | 25 Here's the transcript of his speech on national breakfast.
-----------------------------------------------------------
[Benjamin Solomon "Ben" Carson, Sr. (September 18, 1951)] Source: LYBIO.net
Thank you so much. Mr. President, Mr. Vice President, Mrs. Obama,
distinguished guests – which included everybody. Thank you so much for this
wonderful honor to be at this stage again. I was here 16 years ago, and the
fact that they invited me back means that I didn’t offend too many people,
so that was ... 阅读全帖 |
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a**********2
发帖数: 3726 | 26 Trump Twittered before: FAKE news is the enemy.
NPR is bs. It truncated the key word "fake", and added a provoking word "
people's".
Shame! |
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l**4
发帖数: 853 | 27 希望对大家有所帮助吧。我当年就是这样学习美国的highway的。
标 题: Re: 诚心请教：我始终不敢一个人独立上高速怎么办啊？
发信站: BBS 未名空间站 (Sat Jun 11 14:45:51 2011, 美东)
hw 183 奇数 南北方向
hw 282 偶数 东西方向
同时HW上有牌子指示你现在那个方向。
reference：
http://en.wikipedia.org/wiki/United_States_Numbered_Highways
Numbering
The two-digit U.S. Routes follow a simple grid, in which odd-numbered routes
run generally north to south and even-numbered routes run generally east to
west. (U.S. Route 101 is considered a two-digit route, its first "digit"
being 10.) The numbering patte... 阅读全帖 |
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f****l
发帖数: 5514 | 29 正常人ZT两个字是放在title最前面的，它故意WS地放下最后，很多手机APP显示时就
truncate了。
这群无脑美托很搞笑的，之前一个假装自己买CMAX，现在这个又假装买Pacifica, 就是
不肯真的自己买美车～～～ |
|
f****l
发帖数: 5514 | 30 正常人ZT两个字是放在title最前面的，它故意WS地放下最后，很多手机APP显示时就
truncate了。
这群无脑美托很搞笑的，之前一个假装自己买CMAX，现在这个又假装买Pacifica, 就是
不肯真的自己买美车～～～ |
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W*****e
发帖数: 7759 | 31 【 以下文字转载自 Stock 讨论区 】
发信人: iPeople (iPeople), 信区: Stock
标 题: A股美股
发信站: BBS 未名空间站 (Sat Aug 22 23:45:10 2015, 美东)
上周四大跌后写了这么几句，觉得婆婆妈妈啰里啰唆，纠结着没有在版上发，发给了几
个朋友。现在发可能也不太晚，算是给有缘之人提个醒吧。
七月初提醒过，市场挤空，纳指新高，其它的指数没有就是个很大的警讯。
http://www.mitbbs.com/article_t0/Stock/36257739.html
美股大跌，SPX直接跌破颈线2040，我从上半年就看衰美股，认为美股筑顶明显，这一
年多来都是在高位震荡出货，401K就是bag holder。 现在看来全球股市在A股美股的带
领下要走一波熊市。 A股早已进入熊市了。美股也不远了。
永远不要低估市场的志存高远，曾经历尽艰辛把SPX从666点推至2100历史高点以上，这
次花了这么大力气做了个圆弧大顶，又岂会浅尝而止。
A股是震荡的熊皮市，人气已经溃散，制度设计有重大缺陷，当然只是对散户不利，对
庄家和机构是贴心的... 阅读全帖 |
|
l******n
发帖数: 9344 | 32 Detection of two-component mixtures of lognormal distributions in grouped,
doubly truncated data: Analysis of red blood cell volume distribution
1991
C.E. Mclaren, M. Wagstaff
to f********[email protected]
baozi
thanks |
|
c*****n
发帖数: 949 | 33 貌似以前从44.1->48Hz sampling rate 转换的时候，问题主要处在digital truncate
，刚刚从foobar上看到有dither的选项，如果用foobar 放音乐的话可以试试，好像感
觉声音更柔顺了，也可能是心理作用。 |
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L*****k
发帖数: 13042 | 34 我生成分轨文件的时候文件全路径名超过256字符造成失败，
有没有办法让foobar自动限制（truncate）文件名长度？ |
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k**f
发帖数: 372 | 35 What you put in the title is truncated.
Which investment account charges you 1.5% fee? on what basis? What kind of
account is this one, taxable or retirement?
Please provide more information so others can help you. |
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M*****y
发帖数: 666 | 36 【 以下文字转载自 Quant 讨论区 】
发信人: MsPiggy (coconut), 信区: Quant
标 题: 一道关于两倍年龄的题目
发信站: BBS 未名空间站 (Thu Mar 11 19:32:14 2010, 美东)
有没有高手来说说这道题怎么讨论？
两个人，A,B. A的年龄比Ｂ大。
For what length of time in their lives will A's age be twice B's age? (此处
的年龄说的是 truncated integer age). 还有一个assumption是两个人都可以无限地
活下去。
假设不限定具体的年龄数，该如何讨论这道题目呢？多谢！
我自己觉得无论Ａ，Ｂ多少岁，这个问题的答案始终是１年
不知道对不对，有什么合理的讨论方法 |
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f**r
发帖数: 865 | 37 what does it mean by "truncated integer age"? does that mean the age could
overflow? |
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c***2
发帖数: 838 | 38 1) Yes, if intending to use the same var, 'extern' shall be used.
2) The interviewer says, this is a coding error and asks what will happen.
my answer is to upgrade var as float. but he says compiler will truncate it
to int.
just tried: my answer is right:
a.c |
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x****k
发帖数: 2932 | 40 一家IB的Analytics developer的onsite，只记得部分题目，一些比较简单的题目就不
写了。括号后是我认为的答案或者提示。
1. write a iterative function to calculate fibonacci sequence
2. what is the difference of Delete table and truncat table.(about sql &
database)
3. what is ACID.(about sql or database)
4. write a find() for BST, How to decide the element could not be found.((
less than && No left child) || (large than && no right child))
5. how to reverse a link list using one point
(should I use recursive calling)
6. find the sizeof(int) wit... 阅读全帖 |
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i**********e
发帖数: 1145 | 41 贴一贴我的代码吧，抛砖引玉.
代码已经改了好几遍，尽量简洁，但是有一些部分还是非常 tricky 的.
代码经过严格的测试.
如果你要测试数据，可以站内联系我.
另外要提到的是:
我想这题难度系数还是满大的，网上的解法不一定对，例如这个就有好几个 bug:
http://geeksforgeeks.org/?p=2105
第一，没有得到平均和（他的直接除以二然后 truncate ）
第二，测试了有好几个 case 没通过
很多网上的答案都只能够处理 m == n 的情况，看来 m != n 的情况复杂很多，其实不
是. 掌握思路要点后一点也不难，就是要确保这个 invariant 得到满足:
-- 每次从数组 A 和数组 B 去掉的元素个数必须相等.
掌握了以上的每次去除元素的思路，递归就很直接可以写出来，这只是解这道题最简单
的部分，更难的还有以下非常 tricky 的要点：
1）怎么知道递归的终止条件？ 应该很容易想到当其中一个数组个数为 1 的时候，就
必须个别处理，不然就会死循环. 而为什么其中数组个数为 2 的时候也必须个别处理
就不是那么明显了.
2）当个别处理 spec... 阅读全帖 |
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c*****e
发帖数: 737 | 42 1s要10k个数量级的request，那么差不多1个request要在100 microseconds以下处理完
，你用list啊，queue啊，每次处理都要去truncate那些过期的request，还要存入新的
request，还是很慢的。
类似的东西stock exchange也有，叫market impact，检查1秒钟内交易的频次，就是用
个timer call back做的。
当然如果要求不是1秒钟，而是检查1个小时内的request数量，那么你可以搞个list或
者queue，每次handle的时候把container里的request清理一遍。举个例里，阿三的证
券交易所有这个要求，某一小时内某股票的交易数量不能超过X。那么做法就是把(
timestamp, request)存放到一个list里，每次handleRequest的时候，先检查list里有
没有1小时以前的，把那些remove掉，然后把新的加进去。
这个问题还可以扩展一下，假设server是分布式的有很多个，要求用户某段时间内发给
所有server的request在某个limit下面，该怎么做？你可以把这个... 阅读全帖 |
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o****d
发帖数: 2835 | 43 you are right.
找了一个溢出之外的解释
当low high不是指数组index的时候 有可能是负数
然后除2之后 会碰到潜在的问题
参考
http://community.topcoder.com/tc?module=Static&d1=tutorials&d2=
"You may also wonder as to why mid is calculated using mid = lo + (hi-lo)/2
instead of the usual mid = (lo+hi)/2. This is to avoid another potential
rounding bug: in the first case, we want the division to always round down,
towards the lower bound. But division truncates, so when lo+hi would be
negative, it would start rounding towards the higher bound." |
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G**C
发帖数: 365 | 44 是两个指针 nextNegative 和nextNonNegative.
退出大循环后，从[nextNegative, size())都一并truncate.
请指教简化tips. |
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m******t
发帖数: 273 | 45 【 以下文字转载自 Statistics 讨论区 】
发信人: myregmit (myregmit), 信区: Statistics
标 题: find distribution paramters only by data mean and std. dev.
发信站: BBS 未名空间站 (Mon Mar 17 17:14:15 2014, 美东)
I need to estimate a truncated gamma distribution paramters (shape , scale).
But, I only know the data mean and std. dev. I do not know the dat set.
Given the mean and std. dev. of a data set from a trucnated gamma
distribution, how to find shape and scale of the distribution parameters ?
I know MLE may be sueful for ... 阅读全帖 |
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m******t
发帖数: 273 | 46 I have tried this, but the QQ plot result is very bad.
I know this calculation if it is gamma.
But, It is truncated gamma.
Thanks ! |
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N**********i
发帖数: 34 | 47 从7月份到现在，磕磕盼盼终于拿到了FB的offer，准备从了。就此做个总结，希望能对
还在找工作的朋友们有所帮助...
准备： lc（没刷完，但是有些高频题做了好几遍，还有水中的鱼的博客），cc150（先
刷了一遍，然后又看了好几遍，反复看了书中的一些不错的解法），g4g（稍稍做了一
些题），各大面经、版上大牛总结帖。我不是new grad(2年工作经验)，所以简历上的
工作时的projects好好准备了一下。
整体感觉就是：
1. 被拒多半还是实力问题+少许运气问题。onsite interview最好保证每一轮都不差（
哪怕都没有很突出），否则就很容易悲剧。所以还是得要多做题甚至多面试找感觉
2. 最有用的是lc+面经+大牛总结，面试时至少有30%-50%会遇到类似甚至一样的
3. bug free很难做到，也没啥必要. 之前有人说FB要求bug free被吓到了，但是感觉
思路+clean code更重要
4. 在三三面试官面前不要害怕，反正你做的多好他们都可以想办法阴你，还不如放松
心态跟他们好好一战
L(电面跪了)
HR分组的时候有点奇怪，分到了类似Site Reliabil... 阅读全帖 |
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l******e
发帖数: 28 | 48 为什么不能直接上一个SHA hash然后truncate？
这有啥concern？ |
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a*********i
发帖数: 86 | 50 国人哥们主面, 小印跟班. 面Backend infra
给了一道这样的题
/*
Question Description: You are to write an abstraction layer for a persistent
buffer. Provide an implementation of the following abstract class:
*/
public abstract class pBuffer {
protected final int BLOCK_SIZE = 1024;
protected final int BLOCK_COUNT = 1024;
protected byte[] buffer = new byte[BLOCK_COUNT * BLOCK_SIZE]; // A sample
1mb buffer, to be allocated in 1k chunks.
public pBuffer() {
fillBufferFromFile(); // Reads the buffer from file an... 阅读全帖 |
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