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全部话题 - 话题: model
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s*********e
发帖数: 1051
1
just want to clarify your question.
are you specifically interested in the difference in estimation method
between gee and glmm?
or are you interested in the conceptual difference between marginal model
referred to gee and conditional model referred to glmm?
also, since the difference between gee and glmm is less pronounced in
gaussian models, I assume you are referring to non-gaussian models.
in any sense, this is an interesting topic.
a****m
发帖数: 693
2

model
主要是对他们原理的不同不是很理解:看了半天,大概有个认识了,把别人的slide上的
东西copy下
来,很是拗口。
总的理解是GEE 用的quasi-likelihood numerically solves their parameter, beta
and variance.
mixed model assume normal distribution, and analytically solve the
parameters using ML.
GEE vs MRM
• GEE not concerned with V (yi)
• GEE yields both robust and model-based std errors for beta ;
MRM, in common use, only provides model-based
• GEE solution for all kinds of outcomes; MRM needs to be
derived for each
• For non-no... 阅读全帖
c****s
发帖数: 395
3
来自主题: Statistics版 - A Model question, urgent please!!
I am not good at this, but here is my 2 cents
usually contribution is not used in selecting models
but here comparing two models
the second one, the last variable has a comparatively huge contribution.
it means if it change a little, the model result will change greatly.
if there are a little more outliers for this variable, then the model result
will far from correct in predicting.
so based on that, I will choose model 1.
a***d
发帖数: 336
4
my understanding is that there is no difference the way they are modeled.
but they are interpreted differently. model variables are the ones you are
interested in and want know how they affect the dependent variable. The
control variables are the ones that you are not really interested in but
should be added to the model so that the estimate on the model variable
coefficients are accurate.
h*******d
发帖数: 272
5
来自主题: Statistics版 - ** analyst or model developer ??
大家好 这里帮同学问个问题
在面2个BANK, 一个是model developer, 一个是 sr ** analyst, 都是SAS有关,前者
是market下的modeler, 后者类似于business/strategy analyst,会学到一些business
的东西
请问那个方向比较好些? 我们这些FRESH的小硕没经验不知道该怎么看这2种position
的发展方向。 做modeler更好些吗?感觉建模是比较硬性的SKILL, 将来modeler可以做
ANALYST, 但analyst不一定能成为MODELER。
谢谢大家 请大家随便说一说吧。
t********m
发帖数: 939
6
来自主题: Statistics版 - 该用cox regression model还是gee model?
多谢提示。我对于cox model处于一知半解的状态,两种model我都run了下,可是发现
得出来的model的likelihood ratio和各个parameter的estimate都不太一样啊。不知道
是怎么回事呢,我再看看我的data和model有没有问题。
g********n
发帖数: 251
7
data set have variables:subject,day,pk_concentration,dose,pd_response.
emax model using proc nlmixed;
parms s2p=xx s2e=xx emax=xx;
num=emax*dose;
den=ed50+dose;
model pd_response ~normal ((num/den)+subject,s2e);
random sub ~normal(0,s2p)subject=subject;
run;
现在要做pk/pd modelling,怎么样把day 和pk_concentration 放到model 里呀?沒做
过pk/pd modelling.有没有人知道的,谢谢啦
d******e
发帖数: 551
8
精算偏传统的模型,大部分的做法都是 define好的,很多是一元的风险管理;
Predictive modeling以多元回归为主,在保险公司是新的技术。这个听起来简单,但
是具体的做法上有很多的trivia,包括dependent / independent variable的定义,
loss development, premium on-level,missing data permutation, binning,
outliner (usually big loss) processing,需要一些经验。跟精算是互补关系,一般
来说,精算师负责定价,建模的人负责协助(pure premium model),或者另外加一层
定价(loss ratio model)。建模的人还可以建市场相关的 response rate model来做
targeted marketing
Predictive modeling在保险公司地位尴尬,一方面工作清闲不加班,稳定性有保证。
另一方面,地位不如精算师,钱给得相对少而且涨得慢(现在据说多了一些),数据量
不算特别大(所以往往接触不到最新的... 阅读全帖
D**u
发帖数: 288
9
来自主题: Statistics版 - rare events的modeling 问题
1st choice:
oversampling/stratified sampling, add weight to the observations, both sas
and R can do this easily.
2nd choice:
rather simple negative binomial model than any zero inflated models for the
ease of avioding mixture model
of course, you can always try zero inflated models
a good explanation is here:
http://www.statisticalhorizons.com/zero-inflated-models
b****d
发帖数: 35
10
【 以下文字转载自 JobHunting 讨论区 】
发信人: budbud (I am bored), 信区: JobHunting
标 题: job opening in northern NJ, key word: statistical modeling, SAS, commerial lending
发信站: BBS 未名空间站 (Wed Oct 16 20:26:11 2013, 美东)
Urgent Hire, expect to start ASAP.有兴趣请站内联系。
AVP, Quantitative Analyst (Credit Scoring Models)
This is a position within the Quantitative Development & Analysis Group.
The incumbent is expected to design, develop, implement and maintain various
credit scores and their applications in credit decisi... 阅读全帖
l******n
发帖数: 143
11
我自己的论文题目是做state space model的,尤其是针对structural time series
model,就是基本上,做的模型大概是:
Y = Trend + Local Anomaly + Seasonal Component + Noise
我自己主要是想找一个学生一起讨论讨论general state space model setting,尤其
是有一手经验的人,比如set up model, initial values以及各种模型之间的互相转换。
因为我们学校基本上没有人是做这个的,所以很多时候我都是自己看书,但是有时候也
很苦恼,有些问题做出来的结果和我自己想像的还是有一些差别,所以特意来版上,找
做此方面的phd学生或者有经验的人,能够相互讨论一下。
我自己这里相关的书籍都已经买了,也一直在读,可能做的时间不算长,所以还没有完
全明白所有的方面。希望能够找人一起进步,如果可能,私信联系啊,可以加个qq或者
电话什么的。多谢啦。
N********m
发帖数: 107
12
【 以下文字转载自 JobHunting 讨论区 】
发信人: Nightstorm (Swordblade,Nightstormy, Icyriver), 信区: JobHunting
标 题: Modeling/Scoring/Analysis Analyst, manager and senior manager positions
发信站: BBS 未名空间站 (Wed Apr 8 12:16:09 2015, 美东)
Consumer modeling unit in a major bank is under big expansion. There are
many positons for entry and experienced level canidates. They are hiring
Modeling/Scoring/Analysis Analyst, manager and senior managers.
Requirements: MS/PH.D. in Stats, econ or math.
Experience in using econo... 阅读全帖
m*******e
发帖数: 90
13
摘自网上:
Count data is usually best modeled with distributions like a binomial (where
there is a maximum count), Poisson, or negative binomial (or others). In
these distributions there is a relationship between the mean and the
variance. ANOVA models assume normal distributions and equal variance, both
of which are violated if the "truth" is one of these other distributions.
That being said, the binomial, Poisson, and negative binomial can all be
approximated by a normal distribution under certain ... 阅读全帖
y*****n
发帖数: 5016
14
one (modeler) posted, two to be posted (modeler&reporting analysis).
Basic requirement:
Modeler -- 3+ years of model development experience (preferably in financial
industry).
Reporting analysis -- 2+ years of experience in reporting.
All positions require proficiency in SAS and SQL.
May transfer H1b but will not sponsor green card.
email resume to [email protected]/* */
s*****o
发帖数: 48
15
CFP: CVIU Special Issue on Shape Modeling in Medical Image Analysis
Aims and Scope: Exploring and using anatomical shape properties plays an
increasingly important role in many medical imaging and image processing
applications. For examples, in medical image segmentation, prior knowledge
on the shape of interest has been used to achieve more accurate segmentation
, e.g. in case of ambiguities owing to limited image quality. In
neuroscience, the shape of certain brain structures, such as hippoca... 阅读全帖
f********m
发帖数: 8397
16
heihei, Cmax looks even more attractive than ever.
http://www.autoblog.com/2010/12/27/ford-expanding-start-stop-technology-
to-non-hybrid-models/
Ford expanding stop-start technology to non-hybrid models
by Sebastian Blanco (RSS feed) on Dec 27th 2010 at 12:01AM
Given the multifaceted approach to making more efficient vehicles
favored by Ford, an automaker that employs everything from EcoBoost to
hybrids, pure electrics to less thirsty gas models – it's not that
surprising to learn that the comp... 阅读全帖
d******g
发帖数: 6966
17
来自主题: _Auto_Fans版 - 去体验了一把Model S
我觉得model S的加速优势并不是你说的起步阶段,也并不是全油门的状态.
汽油机起步能用到放大比很大的一档,同马力的车和model s比不会很吃亏
全油门的情况下,基本上就是看最高马力的比拼, 同马力的车和models也应该差不多
model s的加速(或者说加速感)优势是在0到70mph区间(我没开到更快过)中的任何速
度下
从轻油门一下子到重油门车子加速感觉是一样的, 这个其实是大多数人日常驾驶中最用
得到加速力的时候(匀速进行,突然想加速超车之类的). model S在中等速度匀速情况
下对重油门的反应,同马力的汽油机是完全无法相比的,除非你硬放在很低的档位高转
速匀速驾驶.
o**********e
发帖数: 18403
18
来自主题: Military版 - 哀悼胡耀邦: BAYESIAN MODEL
LS: 说一个人是否“SB”,其实
也是BAYESIAN MODEL...
汉族应该适当地弘扬汉族文化。
对少数民族要团结善意,但是应该
注意不要学习左棍的一味纵容,那是
害人害己的愚蠢。
胡比较善良: 善良的中国人往往会
把别人MODEL成善良的INITIAL
STATE。 但是大家都得不断UPDATE
MODEL嘛。
胡都去世几十年了,老中忘了
UPDATE MODEL,咋能怪
胡耀邦呢?
g**1
发帖数: 10330
19
http://www.amazon.com/Chinese-Wife-Guide-Model-Type-Girlfriend-ebook/dp/B01LLNL90Y
Chinese Wife Guide: How to Find a Model-Type Chinese Girlfriend or Wife
Kindle Edition
by Julian Bernard Stiles (Author)
This book is a must-have for anyone who wants to have a top-notch, model-
type Chinese girlfriend or marry a such a girl.
Chinese women are, in my opinion, the best in the world, with common, highly
-valuable and sought-after qualities such as slim & hot body types,
beautiful faces, frugality, f... 阅读全帖

发帖数: 1
20
【 以下文字转载自 Automobile 讨论区 】
发信人: burst1 (破碎虚空), 信区: Automobile
标 题: model 3好在哪儿?今天去看了实物,有点失望
发信站: BBS 未名空间站 (Sat Jul 28 16:20:12 2018, 美东)
对model 3感兴趣,今天去店里摸了摸,没有试驾,因为要预约。内饰有点失望,感觉
车也偏小。哥身高只有1.68,坐在驾驶位置居然觉得微微有些局促,不过可能和哥开惯
了full size sedan有关。方向盘也有点小,有点像玩具。座椅也不是特别舒服。
坐进旁边的model s感觉倒是很不错,可惜s太贵,超了预算。
本来打算这几天就订model 3,现在有些动摇了。3的owner能讲讲好在哪儿吗?谢谢大
g********2
发帖数: 6571
21
One of the most respected and accurate forecasting models in political
sciences says that Donald Trump will win the 2016 presidential election, and
by a fairly comfortable margin at that.
Emory political scientist Alan Abramowitz's "Time for Change" makes
predictions by considering how the economy is doing (measured by the GDP
growth rate the second quarter of the election year), how popular the
incumbent is (measured by his Gallup approval rating at the end of June),
and whether the incumbent i... 阅读全帖
l*******g
发帖数: 27064
22
有人发过没?
呵呵,刚买Avalon那哥们是不是也该去修一下?
Toyota has announced plans to voluntarily recall 803,000 vehicles from model
years 2012 and 2013, over concerns with the air conditioning condenser
housing. The recall covers the Camry, Camry Hybrid, Avalon, Avalon Hybrid
and Venza, although the exact split between affected models wasn't available.
According to Toyota, the condenser can leak onto an airbag control module,
which in turn could cause a short circuit. In most cases, this will just
lead to an airbag wa... 阅读全帖
KV
发帖数: 5728
23
来自主题: Automobile版 - Tesla model s求建议
最近电车很热,俺LD有点心动,平时上班短途用,单程20~25迈,来回大约50迈,从不
开长途,特斯拉model s值得买么?
家里有三个娃,看这个model s可以额外加car seat,变成六人座(两个小孩座),不
知道是否有安全隐患。我查了一下model s的重量,接近5000磅,从没考虑过电车,今天
去了特斯拉店里,店员说model s如果配好,五月底前可以交货,90D比70D贵一些,不知
道性能差多少。
这个rear facing小孩坐位是否很安全?我今天在特斯拉店里,看底座frame是相当厚实
的铁块。
o***o
发帖数: 11767
24
来自主题: Automobile版 - 特斯拉model x是轿车还是suv?
特斯拉中文网站说是全尺寸,大型SUV。Model X 是史上最安全、最快速及最实用的SUV
运动型多用途车。
Model X 是一款高性能、安全、智能的全尺寸 SUV 。标配全轮驱动,以及可提供 489
公里续航里程的 90 kWh 电池。Model X 拥有宽敞的驾乘空间和储物空间,足以容纳 7
位成人及其随行装备。启动 Ludicrous 狂暴模式后,百公里加速仅需3.4 秒。无论是
实用性还是高性能,Model X 从不妥协。
f******t
发帖数: 7283
25
行业里面做任何一种级别的车子,都自有它对应的最低要求。Model S卖这个价位,自
然就是直接跟一线大厂的full size旗舰豪华轿车竞争。
大型豪华轿车当然要讲究车身抗扭刚度,甚至在总设计师的眼里这是必须要达到的目标
。研发人员描述产品用的概念和词汇,当然不会跟消费者群体完全重合,但这并不意味
着对于消费者来讲没有用或者意义不大。你不把Model S跟S550/750/A8/LS等这些车型
在同一时间内side by side试驾比较,当然不会觉得Model S在这方面的不足,因为你
没有参照物;或者假如你之前开的是菜车、中/小型入门豪华车、SUV这些,你也当然不
会觉得Model S在抗扭刚度上有问题。但是,一旦跟竞争对手同时比较,这个差异就显
现出来了。
数据不会说谎。假如19000 nm/deg够用的话,这么多一线大厂就不会花巨资来研发新型
材料、焊接/铆接等等工艺和技术,来把大型轿车的抗扭刚度提到40,000 nm/deg这个级
别了。
f******t
发帖数: 7283
26
请注意,我不是在跟你讨论“权威地方”和“豪华车”的关系。这就好比说“诚实”是
“好人”的一个必要条件,大家对这个也没异议;但你硬要我说“什么权威的地方制定
了这个标准”......请问,你想要什么答案?
不过倒是有可以认为是“权威地方”来认定谁是“豪华车”。比如说Colorado州,
Colorado Public Utilities Commission,专门管Taxi/Limo Licenses的,对“豪华车
”(luxury executive cars)制定了标准。可惜的是按照该规定,法律上来讲Model S
在科罗拉多州不能被认为是豪华车:
(II) Executive car, which is a motor vehicle that has four doors and is:
(A)a sedan, crossover, or sport utility vehicle manufactured by: Acura, Audi
,Bentley, BMW, Cadillac, Ferrari, Infiniti, Jaguar, Lexus, Lincoln, Mas... 阅读全帖
f******t
发帖数: 7283
27
我觉得你的mindset一直都没对上号。这个帖子本质上是什么?
你叙述为什么喜欢/要买Model S的原因;我叙述为什么我觉得Model S不好的原因。
至少我,不去讨论为什么你不能喜欢/认可Model S,我相信这里也没有人强迫你去认
为你喜欢Model S的原因是不对的。

f******t
发帖数: 7283
28
一说到实质性的东西就顾左右而言他,搬出“广大用户”来唬人。请问,这“广大”有
多大?有多少人?又接着拿娱乐性的业余杂志的某些段落来扯大旗对吧?
“目前为止还是没有出现过一辆能超越model s的电车”,怎么定义“超越”?假如说
reliability,Model S不要说“超越”了,估计是全行业垫底的;说到车身动态/静态
抗扭刚度,Model S也是电车里倒数的;说到装配精度,Model S也是乡镇企业水平。这
车关键地方做得马虎、丢脸的地方多了去了,还“超越”呢......但我相信你对这些是
选择性失明的,对吧。
汽车行业内各领域的会议,其它车厂都有高科技的东西可以present,就唯独特斯拉什
么声息都没有。趁着大部分消费者都不太懂汽车专业知识,把领域内最trivial的科普
技术当成是独家高科技来忽悠消费者。自己产品技不如人却骗人放心用,结果出事死了
人,马上摆出一副公事公办、拿出法律条文来推脱的嘴脸。这种产品,也就只有无知所
以信心爆棚的人才会拿出“以身相许”的架势,不容得别人指出任何缺点。
f*******e
发帖数: 5277
29
Bolt本身不错的,这点要给GM点赞。不过和model 3毕竟还不是一个比较对象。Bolt是
一个一万五左右的油车电气化卖三万多,model 3是一个四到六万左右的油车电气化卖
四万多,bloomberg今天的文章有个对比https://www.bloomberg.com/news/articles/
2017-07-31/driving-tesla-s-model-3-changes-everything)。这还不提tesla超充网
的优势。
所以bolt目前平均每月销量一千多一点,库存一直攀升,最近GM延长停产时间。model
3有五十万的订单。
另,痛苦之刃很帅
y******y
发帖数: 207
30
Yeson - 下面是动力性的文献证据。 目前只有84.5万美元的保时捷 spyder 918 更快
。不久后
120D 150D 出来你知道结果的。 还有话说吗? 丢人吗?望你汲取教训。
2017 TESLA Model S P100D: 0-60 mph in 2.28 Sec
见下:
https://www.google.com/amp/www.motortrend.com/cars/tesla/model-s/2017/2017-
tesla-model-s-p100d-first-test-review/amp/
https://m.youtube.com/watch?v=P4YnebnkEqs
Other fastest cars:
见下
http://www.businessinsider.com/10-cars-that-are-faster-than-the-tesla-model-s-with-ludicrous-mode-2015-7/#ferrari-laferrari-0-60-in-25-seconds-reached-by-car-and-driver-p... 阅读全帖
y******y
发帖数: 207
31
黑心价吗??? 你真可悲,不懂装懂,而且鸵鸟一样,自欺欺人,还嘴硬。
事实是 50万美元以下的车,Tesla Model S (13.8万美元) 在几乎所有的重要指标方面
秒杀其他的所有车(包括其他电动车),如动力加速、安全性(这两个最重要)、ADAS
的水平 (及不久的自动驾驶)、空气动力学、中控屏方式(2012 就已用,现在也没有
公司做的的功能和UI)。
即使你认为不是秒杀每一项,综合也是秒杀其他车。 不然请你举例。
如果说一分钱一分货,tesla 是远远的物超所值。 你为什么这么没有脑子,睁眼说瞎
话说?
老实说,按照其动力性 alone,即使 13.8万美元是物美价廉,可惜一般人还是买不起。
Musk 没骗人,事实非常诚实,他非常直接的说买 S 和 X 就是 support 3 的研发。
Autopilot 死人是因为滥用,当level 4 用,特斯拉基本无过错,事实证明autopilot
降低事故。 特斯拉也立马在 autopilot 1 加入雷达信号检测,作为和 passive
vision 同样重要的路障识别。
Model S 30% market:
https://... 阅读全帖
n****i
发帖数: 1772
32
不全是。主要是Elon在model x上犯了严重错误。Model X如果上市提前一年,tsla不会
是现在这个样子。现在回头看,忍痛看feature, 确保model x上市是正确抉择。model
3现在是第二次机会了。

f*******e
发帖数: 5277
33
model x提前上市一年也没什么区别吧,2015年以前model s需求增长并没有放缓,还在
努力增产,加一款车型对财务没什么帮助。model x推出的时间没啥问题,feature太多
导致生产执行问题大,前几个季度改生产线就花了几个亿,次品率也太高。
上周五Elon再次用到production hell这个词把我吓一哆嗦。

model
d***a
发帖数: 13752
34
其实就算没有这$7,500的折扣,Model 3也完全可以和3系与C级在性能和价格上竞争了
。再考虑到维护费用和油费,Model 3的拥有费用应该会更低一些。
Model 3的不确定性在于产能,还有会不会有可靠性的问题。
Model 3的成败,对Tesla和纯电车来说,都是很重要的事件。如果成了,整个汽车产业
的大变革就开始了。
m*******0
发帖数: 25
35
来自主题: Automobile版 - 刚定了Tesla Model X, 有两个原因
看了GLS,Q7, XC90, 几乎要买XC90了,试了下Model X, 立刻下了订单.
主要因为两点,
1) 可以走Carpool lane, 弯曲交通太拥堵了
2) Model X的第三排比XC90好
当然ModelX的加速度AMAZING!.我加了autopilot的option, 走237就不用踩油门/刹车.
十月三十一号之前买可以有$1000的Credit, plus free unlimited Supercharging
with a new Model S or Model X if you use my referral, http://ts.la/yubin9395
$$Those who order before October 31, 2017 will also receive a $1,000
purchase credit.
m*******0
发帖数: 25
36
来自主题: Automobile版 - 刚定了Tesla Model X, 有两个原因
没想到上了top 10 hot topics, 那就再多说几句。
我有一个十年新的minivan, 毫无疑问,性价比,实用性,minivan是大家庭的首选。
孩子从toddler长大到teenager, 就想换成SUV,cool一点。选三排座的,家里人都能坐
得下,做为primary car,希望好点。
看了Yukon,第三排座椅太矮。Lexus GS 也是。
GLS控制台设计风格太老,不像新车:-)
Q7,控制台设计风格最喜欢,可惜第三排座椅太矮。
XC90,第三排比Q7好。第一排座椅非常舒适。不过T6不能走car pool,T8价钱又上去了
,和model X 差不多。
没试X前不知道第三排座椅没有其它车座椅矮的通病,是个惊喜。I don't expect 7
people sitting in my car are all 180cm, I guess the 2nd row and 3rd row
seats on Model X should be good enough for my family.
如果你在看7 seat luxury SUV, 建议你不要忘了model ... 阅读全帖
m*******0
发帖数: 25
37
来自主题: Automobile版 - 刚定了Tesla Model X, 有两个原因
看了GLS,Q7, XC90, 几乎要买XC90了,试了下Model X, 立刻下了订单.
主要因为两点,
1) 可以走Carpool lane, 弯曲交通太拥堵了
2) Model X的第三排比XC90好
当然ModelX的加速度AMAZING!.我加了autopilot的option, 走237就不用踩油门/刹车.
十月三十一号之前买可以有$1000的Credit, plus free unlimited Supercharging
with a new Model S or Model X if you use my referral, http://ts.la/yubin9395
$$Those who order before October 31, 2017 will also receive a $1,000
purchase credit.
m*******0
发帖数: 25
38
来自主题: Automobile版 - 刚定了Tesla Model X, 有两个原因
没想到上了top 10 hot topics, 那就再多说几句。
我有一个十年新的minivan, 毫无疑问,性价比,实用性,minivan是大家庭的首选。
孩子从toddler长大到teenager, 就想换成SUV,cool一点。选三排座的,家里人都能坐
得下,做为primary car,希望好点。
看了Yukon,第三排座椅太矮。Lexus GS 也是。
GLS控制台设计风格太老,不像新车:-)
Q7,控制台设计风格最喜欢,可惜第三排座椅太矮。
XC90,第三排比Q7好。第一排座椅非常舒适。不过T6不能走car pool,T8价钱又上去了
,和model X 差不多。
没试X前不知道第三排座椅没有其它车座椅矮的通病,是个惊喜。I don't expect 7
people sitting in my car are all 180cm, I guess the 2nd row and 3rd row
seats on Model X should be good enough for my family.
如果你在看7 seat luxury SUV, 建议你不要忘了model ... 阅读全帖
f******t
发帖数: 7283
39
来自主题: Automobile版 - 大家觉得Model X今年值得买吗?
Model S是2012年6月推出的,按照普通车厂6年换代一次的时间表的话,以Tesla一贯的
研发水平,能在2018年6月推出全新换代的Model S吗?
对于汽车来讲严肃的“升级改进”,指的是机械架构上的提升。电动机属于门槛和技术
含量都比较低的部件我们就不说了。就看悬架几何设计、车身结构刚度、动态特性、装
配精度质量等等这些所有车都必须要有的因素,你觉得Tesla有花心思去改进吗?
改进是没有了,逐年慢慢退步倒是可能存在的。这不,IIHS测的Model S,后生产的车
子,车架安全笼形变跟同机构早些年测的Model S相比,退步了不止一个数量级的.....
.绝大多数车厂的车型都是越来越坚固的,Tesla可以说是史上第一家车厂,同一车型竟
然能够越造越朝脆弱的那个方向走的。

S
f******t
发帖数: 7283
40
来自主题: Automobile版 - 大家觉得Model X今年值得买吗?
Model S重量大概4500磅附近,跟主流的full size后驱轿车差不多。
但是Model S的重量很多在于电池上面,由于电池对于车体框架的结实程度没有丝毫关
系,因此重量并不会给Model S的结构强度带来任何优势。
另一方面由于电池太重,Model S车架不得不采用铝合金(而不是“钢板”)来减重。
铝合金的物理特性决定了它的焊接性不佳。因此主流车厂对于车架负责承力的铝合金部
件,一般采用铆接、粘合等方式来结合。但我看Tesla很多地方都把铝合金件直接给焊
接了。这样子虽然研发和制造成本低,并且方便快捷,但强度有多少保障就无从知晓了。

q**d
发帖数: 1470
41
我组里一个今年刚校招进来的direct report给我的小中,本科TOP2、屁挨着地半路转
[email protected],国内家住北京东城区四合院。 他进来时拿的是32万的标准包裹(其中12
万sign on)。
上个月某一天我看他在特斯拉官网配置Model X的页面,我就问他是不是要买车。 他说
准备年底前买辆Model X或卡宴。
我于是问他 - 你还是single,住的也是公司免费提供的走路到office 5分钟的luxury
condo(房租按市场价的话至少5~6千一个月,地点NYC),要买车干啥子?????
答曰:周末和女朋友出去玩开开,另外父母春节期间来美,想开Model X去接。
经过我悉心劝导,他同意委屈一下买辆奔驰或宝马。
然后我就给推荐了GLC Coupe,他一眼就相中GLC 63,经过我进一步开导后觉得4缸的
300就够了。这个周末刚提车,还兴奋得打电话来问我如何变档。
这么一来从Model X到GLC300 Coupe 我帮他省了好几万,所以年底bonus可以少发点 :)
我手下另一个小印就很实在,max retirement后全部的收入都进了... 阅读全帖
n******e
发帖数: 1046
42
公司在弯曲,大公司。希望是有工作经验的博士,新成立的team。
Purpose:
•Talent Hire for the Interconnect Technology Center.
Principle Accountabilities/Duties:
•Electrical and Thermal Simulation and Modeling using COMSOL or other
industry standard simulation
•Model and Simulation Verification
•Document engineering work in compliance with company quality system.
•Coordinate activities with outside suppliers specific to the
interconnect technology center deliverables and tasks
•Assess failure... 阅读全帖
D*******0
发帖数: 4476
43
【 以下文字转载自 FleaMarket 讨论区 】
发信人: Desert110 (RealHot), 信区: FleaMarket
标 题: Can anyone check the Model number of Sprint iPhone6?
发信站: BBS 未名空间站 (Sun Sep 28 23:19:38 2014, 美东)
I need some model A1586 of Sprint iPhone 6? Can anyone check the model
number on the back of the phone? This model number includes the following
phones:
iPhone 6 16GB Gold (CDMA) Sprint MG6C2LL/A
iPhone 6 64GB Gold (CDMA) Sprint MG6J2LL/A
iPhone 6 128GB Gold (CDMA) Sprint MG6F2LL/A
iPhone 6 16GB Space Gray (CDMA) Sprint MG692... 阅读全帖
H****N
发帖数: 997
44
A couple of years ago I contacted a group to request an animal model (mouse)
for a study of the system I was interested in. The PI told me they wanted
to do the same thing and did not want to share it. My lab went ahead to make
our own model which is better than theirs. This group never carried out the
study I was interested in and we just published our study. Now they are
requesting our model for a study that is not in conflict with my interests,
since our model is much better than theirs.The g... 阅读全帖
e********s
发帖数: 93
45
【 以下文字转载自 Business 讨论区 】
发信人: endogenous (源), 信区: Business
标 题: 请教一下"update & balance a model"
发信站: BBS 未名空间站 (Mon May 9 10:15:54 2011, 美东)
最近要有一个equity research的interview,会有一个modelling test.
因为自己不是finance背景, 想请教一下"update & balance a model"是不是指他们会
提供一个existing model 和一个最近的10-K/10-Q, 然后让我输入新的data后得到新的
ESTIMATED earning?
Any suggestions/tips will be appreciated.
w****f
发帖数: 684
46
来自主题: JobHunting版 - data model confusion
做postdoctor 好多年了, 天天考虑model,theory。。。近半年来找data mining的
industry position。经常被问到
what model did you use? Interviewer 是想问 data model,
可是可是。。。我很自然的考虑physics models,然后试图解释blabla。。。两边都
迷糊了。
n******e
发帖数: 1046
47
公司在弯曲,大公司。希望是有工作经验的博士,新成立的team。
Purpose:
•Talent Hire for the Interconnect Technology Center.
Principle Accountabilities/Duties:
•Electrical and Thermal Simulation and Modeling using COMSOL or other
industry standard simulation
•Model and Simulation Verification
•Document engineering work in compliance with company quality system.
•Coordinate activities with outside suppliers specific to the
interconnect technology center deliverables and tasks
•Assess failure... 阅读全帖
b****d
发帖数: 35
48
Urgent Hire, expect to start ASAP.有兴趣请站内联系。
AVP, Quantitative Analyst (Credit Scoring Models)
This is a position within the Quantitative Development & Analysis Group.
The incumbent is expected to design, develop, implement and maintain various
credit scores and their applications in credit decisioning for commercial
lending businesses of small and mid-tickets. The scores are built by
industry standard statistical methods incorporating data from various
sources - external and internal data of Fir... 阅读全帖
b****d
发帖数: 35
49
Urgent Hire, expect to start ASAP.有兴趣请站内联系。
AVP, Quantitative Analyst (Credit Scoring Models)
This is a position within the Quantitative Development & Analysis Group.
The incumbent is expected to design, develop, implement and maintain various
credit scores and their applications in credit decisioning for commercial
lending businesses of small and mid-tickets. The scores are built by
industry standard statistical methods incorporating data from various
sources - external and internal data of Fir... 阅读全帖
N********m
发帖数: 107
50
Consumer modeling unit in a major bank is under big expansion. There are
many positons for entry and experienced level canidates. They are hiring
Modeling/Scoring/Analysis Analyst, manager and senior managers.
Requirements: MS/PH.D. in Stats, econ or math.
Experience in using econometrics/statistical models
Good at SAS programming and statistical modeling.
Please send message to me if you are interested.
Thanks
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