j*****n
发帖数: 1545 | 1 我有n个 gaussian mixture model training data， 假设已知每个model都是2个
gaussian model 的混合。
我用 EM 把这些gauss的mean和var都算出来了。
现在我有一个新的mixture model， 假设也是2个gauss的混合，通过EM我也把这2个
gauss的mean和var算出来了。
我想利用前面那n个 mixture gaussian的 mean和var 来估计一下这个新model的mean，
var的概率。
我一开始想的是把training的gaussian mixture 的2n个mean, 2n个var 分开来，第一
个gauss的mean 和 var组成一个2维的概率分布， 第二个gauss的mean和var组成另一个
2维的概率分布， 然后再分别计算新 model的2个gauss的 P1[mean,var], P2[mean,var
].
感觉这样做不对头。
不知道我说清楚没有... |
|
l*y
发帖数: 21010 | 2 http://www.youtube.com/watch?v=Q8UKf65NOzM
The Shangri-Las were an American pop girl group of the 1960s. Between 1964
and 1966 they charted with often heartbreaking teen melodramas, and remain
perhaps best known for their hits "Leader of the Pack" and "Remember (Walkin
' in the Sand)".
http://www.youtube.com/watch?v=wAtUw6lxcis
The Undertones (1970s Northern Ireland band)
Much beloved punk band distinguished by the singular vocals of Feargal
Sharkey and songs about life's simple joys, from teena... 阅读全帖 |
|
|
E**********e
发帖数: 1736 | 4 说到categorical variable， 一般已经是numerical categorical了（1,2,3，。。。
）。 textbook 好像很少讲到mixture的continuous 和 categorical variables。 事
实是很多时候modeling的时候， 都是mixture。 这种情况用pca来降维或者找出
significant的variabels是不是就有问题。
当然也许可以试correspendse analysis， 就是把continous variable group， 然后
用contigency table来找出关联。但是也很少说用了选significant variabels。
问这个问题是因为面试是碰到这个问题。 所以pca来选variables的话，好像不是那么
可信。 lasso也许是个更好方法。 |
|
发帖数: 1 | 5 Obama傻逼是对的，地球是方的是错的， 所以答案是Mixture |
|
s*****r
发帖数: 2347 | 6 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
6 ipad2 mixture
单张面值:
可接受价格(必须明码标价！):
2 wifi 64gb white 940 each
1 verizon 3g 16gb white 750
1 verizon 3g 32gb white 850
2 ATT 3g 64gb black 1330 each
+ 4 cases
物品新旧要求:
new
邮寄方式要求:
your label
我也可以出fedex label，价格面议
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
其他补充说明:
广告的有效期:
物品来源(Required for All Cards!):
我的联系方式:
bbsmail
call 336-685-1004
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
NJ |
|
s*****r
发帖数: 2347 | 7 二手交易风险自负！请自行验证是否合法和一手卡！:
我想卖的物品:
6 ipad2 mixture
单张面值:
可接受价格(必须明码标价！):
2 wifi 64gb white 940 each
1 verizon 3g 16gb white 750
1 verizon 3g 32gb white 850
2 ATT 3g 64gb black 1330 each
+ 4 cases
物品新旧要求:
new
邮寄方式要求:
your label
我也可以出fedex label，价格面议
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
其他补充说明:
广告的有效期:
物品来源(Required for All Cards!):
我的联系方式:
bbsmail
call 336-685-1004
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
NJ |
|
r*****t
发帖数: 462 | 8 夏天没怎么打理草坪，杂草很多。准备重新弄草坪，我应该买纯seed的草籽还是买seed
mixture? |
|
|
l*n
发帖数: 2590 | 10 如果是做overseeding，那就买纯草籽；如果是处理小面积的barespot，那就用seed
mixture；如果大面积的重做（100尺以上），建议你还是买HD的现成草坪。
seed |
|
T*******m
发帖数: 27308 | 11 都可以。店里卖的多半是mixture.
seedmixture? |
|
h******a
发帖数: 198 | 12 请问有什么mixture models的书推荐？ 多谢了！ |
|
w*****n
发帖数: 375 | 13 Bruce. G. Lindsay. 1995. Mixture models: Theory, geometry, and applications.
NSF-CBMS Regional Conference Series in Probability and Statistics, Volume 5
. Hayward, Calif.: Institute for Mathematical Statistics. |
|
w*****n
发帖数: 375 | 14 Finite Mixture Models by Geoffrey McLachlan |
|
i********f
发帖数: 206 | 15 SAS或者R有什么package可以用EM的方法计算Gaussian Mixture Models的参数么?
2个Gaussian分布的混合
找mean(1&2), variance(1&2), probability
或者有什么比较详细的介绍也行
多谢了 |
|
S******y
发帖数: 1123 | 16 Use of R as a Toolbox for Mathematical Statistics
Exploration
- Nicholas J. HORTON, Elizabeth R. BROWN, and
Linjuan QIAN
Mixture Models的参数么? |
|
d******e
发帖数: 7844 | 17 一共3个参数.
1个lambda,Poisson本身的参数
1个Pi,是Finite Mixture的参数
还有一个theta是什么玩意? |
|
l********s
发帖数: 430 | 18 X ~ Pi * Pois(lambda) + (1-Pi) * Pois(theta)
所以有Pi, lambda, 和 theta 三个参数。
不知道我理解错误了没有 - 是mixture of two poisson distribution么？ |
|
d******e
发帖数: 7844 | 19 我说得lambda theta都是向量啊.而且怎么可能只有两个component?
Mixture Poisson的ith component是mean是lambda(i),每个componnent的比例是Pi(i). |
|
w*****n
发帖数: 375 | 20 我认为是你的 mixture model 没有fit 好。
你如何确定需要三个Gaussian components？ 他们的权重又是如何定的？ |
|
W**********E
发帖数: 242 | 21 p1*normal(mu1,sigma1)+（1-p1)*normal(mu2,sigma2).
广义来讲，mixture of exponential families是否还是属于exponential family?
很难写出来exponential families的形式，如果不是，有什么办法能找到minimal sufficient statistics? 谢谢 |
|
l******n
发帖数: 9344 | 22 问个问题哈
n个source,每个source sample,因为观测限制，Ti,i=1,...,n以下的都没有记录。现在
假设每个都是guassian,要做mixture model.那怎么做？
谢谢 |
|
x*******i
发帖数: 1791 | 23 现在是infinite mixture model时代。 |
|
k*****u
发帖数: 1688 | 24 用一些新的办法，除了EM来估计参数。
或者虽然用EM,但是想办法构造一些一般性的密度函数。像copula
或者infinite，高斯mixture，泊松过程，或者帝力克莱过程什么的
chinese restaurant process, indian buffet process，里面应该还是找到不少东西
做的 |
|
d*******1
发帖数: 854 | 25 一个binomial distribution b(n,p), mean=np.
但是如果p也是一个random variable, 比如log(p/(1-p)) follow N(2,4),那么这个
mixture binomial 的mean是什么呢？
谢谢拉。 |
|
E**********e
发帖数: 1736 | 26 这个我知道。 比如就是binary 或就三个level （1,2,3）。 这样也能计算covariance
matrix 吗？ 我搜索了一下， 好像用是么multiple corresponde analysis 是么的。
这样合理吗？ 我的问题就是想选出重要的variables。 mixture of contiuous 和
categoical variabls 能合理的选出重要的variables？ |
|
E**********e
发帖数: 1736 | 27 【 以下文字转载自 Statistics 讨论区 】
发信人: ExpressoLove (MoneyForNothing), 信区: Statistics
标 题: PCA 可以用在mixture of continuous 和categorical variables
发信站: BBS 未名空间站 (Sun May 17 18:03:19 2015, 美东)
据我了解， pca用在continous variables 比较合理。categorical one怎计算
covariance matrix啊？ |
|
w********2
发帖数: 632 | 28 An air-cooled rotary that powered a number of successful World War I
aircraft
History
The rotary engine is unique in that, unlike fixed radial engines, it has a
stationary crankshaft bolted to the firewall, with everything else (
cylinders, crankcase, propeller) all rotating. The rotary in its original
form is extinct, with the term now being used to describe "Wankel" rotary
combustion engines such as those built by Mazda. Though automotive and
motorcycle rotaries were built in the United State... 阅读全帖 |
|
n*******3
发帖数: 5232 | 29 我头疼了好久啊，就为了给她弄吃的发愁。
baby food是不吃了，
我们又爱辣的。
我们妞要上托，要带饭（托的饭忒不健康了），
所以咧，我最近在潜心研究给她做什么吃的。
学习之后知道了，还真不能乱吃，
每天营养要均衡：
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
12－24个月的娃，
Grain， Fruit， Veggie，Protein， Milk每天的摄取应该是：
3， 1， 1， 2， 2 （serving size）。
具体一个serving size就是：
Grain：一片面包 or 半杯米饭 or 一杯cereal
Fruit：一个苹果 or 一个香蕉 or 一杯水果
Veggie：一杯蔬菜
Protein： 一个蛋 or 1oz肉 or 1tbsp 花生酱
Milk: 一杯奶 or 酸奶
－－－－－－－－－－－－－－－－－－－－－－－－－－－－－
当然娃跟娃不同，这就是个大概的概念，我家妞是远远吃不到这个量的，所以具体咱们当娘的自己调整。
带蔬菜我暂时只试过：
蒸baby carrot
蒸peas
蒸aspar... 阅读全帖 |
|
c*****r
发帖数: 529 | 30 http://truthcdm.com/this-could-be-the-end-for-big-oil/
This Could be the End for Big Oil
stunning breakthrough in chemical engineering has unleashed a massive supply
of fuel…
Enough fuel, in fact, to power the entire globe for over 36,000 years.
It’s poised to decimate Big Oil’s obscene profits, make OPEC obsolete, and
hand the United States 100% energy independence.
In fact, the U.S. Department of Defense just invested $7 billion in a single
day…
Apple, Google, and Facebook are spending billion... 阅读全帖 |
|
F*********k
发帖数: 11739 | 31 正宗做法是这个：
Ingredients
Broth:
3 cups water
1 cup dry white wine $
1 teaspoon saffron threads
2 (8-ounce) bottles clam juice
Herb Blend:
1 cup chopped fresh parsley
1/3 cup fresh lemon juice $
1 tablespoon olive oil $
1 teaspoon dried tarragon
2 large garlic cloves, minced
Paella:
1 pound monkfish or other firm white fish fillets
16 unpeeled jumbo shrimp (about 1 pound) $
1 tablespoon olive oil $
2 cups finely chopped onion $
1 cup... 阅读全帖 |
|
b******r
发帖数: 111 | 32 Anyone has experience of inserting 9kb in a 8.4kb vector? 2 months was gone
,but I get nothing. Would
you like to take a look a this protocol and give me some suggestion ?
Thanks a lot
Purpose: Insert 9kb mouse sequence into vector pPNT6.
Vector pPNT6: Its map is at http://www.addgene.org/pgvec1?
f=c&identifier=11072&atqx=pnt6&cmd=findpl . I have inserted 0.9kb DNA in
this vector at XhoI/EcorI
double sites. I should have no problem in cloning short fragment.
Insert DNA is 9kb.I have cloned t... 阅读全帖 |
|
s*****8
发帖数: 606 | 33 最近经常看到论坛中有人提问发动机冷启动不了，根据所学的一点知识总结以下，不足
处望改
正。
该文章为原创。本人不是学汽车的，跟mechanical关系也不算大，汽车只是个人爱好，
以下所
有内容均为自学，所以可能存在不足或有误，希望高人修正指导。
在列出可能造成熄火或者怠速异常因素之前，应该先明白发动机怠速时的基本知识—保
证空
气/汽油比例正常，这里说的正常是比发动机理想状态下空气/汽油比14.7:1汽油输出量
要高，
通常称为rich mixture，因为在冷启动时发动机需要更多的汽油来保证正常运转。
混合气进入气缸中的过程：空气通过intake vacuum进入，通过节气门与汽油混合进入
气缸
PS曾经看过一视频，发动机怠速不稳定，转速表不停的上下摆动，后来原因为drive
belt的问
题
- Mass airflow sensor：heated sensor测量进气流量
- Manifold absolute sensor：测量进气压力
- Intake air temperature sensor：测量进气密度
- Coolant sensor：间接... 阅读全帖 |
|
a**********k
发帖数: 1953 | 34 Creme brulee?
Directions
Preheat oven to 300 degrees F (150 degrees C).
Beat egg yolks, 4 tablespoons sugar and vanilla in a mixing bowl until thick and creamy.
Pour cream into a saucepan and stir over low heat until it almost comes to boil. Remove the cream from heat immediately. Stir cream into the egg yolk mixture; beat until combined.
Pour cream mixture into the top of a double boiler. Stir over simmering water until mixture lightly coats the back of a spoon; approximately 3 ... 阅读全帖 |
|
l********e
发帖数: 636 | 35 写错了， 应该是10cm, 5ml. the original con of PEI is 10mm. dilute 1000.
prepare 2.4ml DMEM with 0.1ml pei. prepare DNA mixture with 2.5ml DMEM with
DNA. add PEI mixture to DNA mixture dropwise, incubate at RM 20m, then take
the medium out from the plate and add the mixture. after 3-4hour incubate.
take the mixture out and add fresh medium. |
|
h**********r
发帖数: 671 | 36 我在实验室用的Thermo，貌似work的不是很好。
Yeast DNA Extraction
(The protocol was modified by housepainter on December 28, 2009 according to
manufacture’s instructions)
Yeast DNA Extraction Kit, Thermo Number Description: 78870
Storage: Store at 4°C; if precipitant has formed, gently warm DNA Releasing
Reagents A and B at 37°C for 1-5 minutes.
Kit Contents:
Y-PER Reagent, 25 ml
DNA Releasing Reagent A, 20 ml
DNA Releasing Reagent B, 20 ml
Protein Removal Reagent, 10 ml
1. Pellet a 10 ml S. cerevisiae culture gr... 阅读全帖 |
|
f**d
发帖数: 768 | 37 这是一本计算神经科学的优秀著作，全文拷贝这里（图和公式缺），有兴趣的同学可以
阅读
如需要，我可以分享PDF文件（－－仅供个人学习，无商业用途）
From Computer to Brain
William W. Lytton
From Computer to Brain
Foundations of Computational Neuroscience
Springer
William W. Lytton, M.D.
Associate Professor, State University of New York, Downstato, Brooklyn, NY
Visiting Associate Professor, University of Wisconsin, Madison
Visiting Associate Professor, Polytechnic University, Brooklyn, NY
Staff Neurologist., Kings County Hospital, Brooklyn, NY
In From Computer to Brain: ... 阅读全帖 |
|
W*****B
发帖数: 4796 | 38 看来中东人的是大。
欧洲里头居然是捷克和匈牙利的最大。难怪那里也是色情电影大国。
Country Length (cm)
Nigeria (Gerofi) 17.cm / 6.7 inch
US African (Kinsey) 16.6cm / 6.5 inch
US Caucasian (Kinsey) 15.8cm / 6.2 inch
Australia (Smith et al) 15.7cm / 6.2 inch
Brazil (De Ros et all) 14.5 cm / 5.7 inch
Thailand (Muangman) 13.5 cm / 5.35 inch
Korea (Han et all) 12.7 cm / 5 inch
ANOTHER STUDY
South Asians
India 4 inch
Sri Lanka 4.3 inch
Bangladesh 4.4 inch
Pakistan 4.8 inch
Asians
Korea 3.8 inch
Cambodia 4 inch
Thailand 4 inch
Phillipines 4... 阅读全帖 |
|
t******t
发帖数: 15246 | 39 China is advancing its space capabilities by developing staged combustion,
an engine technology that is likely to offer greater performance for the
Long March 6 and 7, two of a family of launchers that the country will field
around the middle of the decade.
The smaller of the two, the Long March 6, may be the first to go into
service, beating the flagship third member of the family, the Long March 5
heavy launcher.
A new 18-metric-ton-thrust engine “is a high-altitude liquid oxygen and
kerosene ... 阅读全帖 |
|
l******e
发帖数: 2893 | 40 A. cut cream cheese into small pieces and mix it with milk in a big bowl.
B. put the bowl onto hot water to melt the cream cheese. Mix them and
make the mixture smoothly.
C. Cool the mixture of B for a while. Then put one yolk and mix it with
the mixture of B. Then put another and mix them completely. Repeat until all
the yolks are mixed. (must put the yolks one by one).
D. put yoghurt and mix.
E. put flour mixture of 1 into D and mix. |
|
i****a
发帖数: 608 | 41 recipe 是英文的，我没有完全按照它上面的分量，尤其是糖。我把改动的地方放在括
弧里了。
prep time: 15 minutes
6 oz Mascarpone cheese (about 3/4 cup)
8 tbsp confectioner's sugar (I used the cane sugar, about 4 tbsp)
2 tsp lemon zest
3 tbsp fresh lemon juice (I only had one lemon left, so use that one to get
the juice)
2/3 cup heavy cream
4 cups fresh raspberries (I only got one small package of raspberries, still
works but 4 cups may be better)
4 fresh ripe peaches, cut into 1/2 inch thick slices(I used 2 peaches)
Steps:
1. In a large b... 阅读全帖 |
|
Y**i
发帖数: 6922 | 42 贴方子,纯英文的,我就不翻译了:
Brined Herb-Crusted Turkey with Apple Cider Gravy
Ingredients
Brine:
• 7 quarts water
• 1 quart apple cider
• 3/4 cup kosher salt
• 1/3 cup granulated sugar
• 1 large onion, diced
• 1 large or 2 small carrots, diced
• 3 ribs celery, diced
• 1 head garlic, cut in 1/2 equatorially
• 1/2 bunch fresh rosemary
• 1/2 bunch fresh sage
• 6 bay leaves
• 1 (12 to 14 pound) turkey, f... 阅读全帖 |
|
a*******g
发帖数: 4872 | 43 好像不是这种? 另一种,里面拌入了紫菜(那种颜色的菜)之类的
thick and creamy.
comes to boil. Remove the cream from heat immediately. Stir cream into the
egg yolk mixture; beat until combined.
simmering water until mixture lightly coats the back of a spoon;
approximately 3 minutes. Remove mixture from heat immediately and pour into
a shallow heat-proof dish.
room temperature. Refrigerate for 1 hour, or overnight.
sugar. Sift this mixture evenly over custard. Place dish under broiler until
sugar melts, about 2 minutes. Watch... 阅读全帖 |
|
z********e
发帖数: 8818 | 44 这个我很爱吃～
曾经自己也试着做过，当然还是毫无悬念的很失败。呵呵～ ：）
thick and creamy.
comes to boil. Remove the cream from heat immediately. Stir cream into the
egg yolk mixture; beat until combined.
simmering water until mixture lightly coats the back of a spoon;
approximately 3 minutes. Remove mixture from heat immediately and pour into
a shallow heat-proof dish.
room temperature. Refrigerate for 1 hour, or overnight.
sugar. Sift this mixture evenly over custard. Place dish under broiler until
sugar melts, about 2 minutes... 阅读全帖 |
|
p****y
发帖数: 23737 | 45 http://well.blogs.nytimes.com/2010/11/04/a-vegan-chef-dishes-up-thanksgiving/
The Los Angeles chef Chloe Coscarelli is best known for winning the Food
Network’s “Cupcake Wars” with her dairy- and egg-free cupcake recipes.
But Ms. Coscarelli, a recent graduate of the University of California,
Berkeley, and the Natural Gourmet Institute in New York City, also has a
passion for vegan savory foods, particularly at Thanksgiving.
“I have served an all-vegan Thanksgiving to the most die-hard carnivores... 阅读全帖 |
|
g**x
发帖数: 1192 | 46 http://www.37ct.com/thread-41533-1-1.html
1)用心理暗示法减轻并转移民众对孟山都转基因灭绝蜜蜂的关注,继续为转基因在中国
的非法推广开道，目前全球不少科学杂志开始探讨孟山都转基因作物对蜜蜂的毁灭性灾
难,有部分文章已经译成汉语,流入中国;
2)为美国的高浓缩转基因玉米糖浆(High-fructose corn syrup)输入中国造势,毁灭中
国的蜂业及甘蔗、甜菜种植业以及相应的制糖业，从而加速中国农业生态的毁灭并在中
国南方与北方同时制造更多的流民，使中国加速陷入它们预设的社会大动荡。
1) 方舟子谈蜂蜜：基本上是高浓度的糖
2010-12-23 10:11:42 来源: 中青在线-中国青年报(北京) 跟贴 969 条
(方舟子的妻子在中青在线担任编辑职位,使中国青年报成为宣传转基因的急先锋与第一
阵地)
中青在线-中国青年报12月23日报道 什么是蜂蜜呢？这个问题似乎很简单，是蜜蜂采集
花蜜酿造出来的甜味物质。蜜蜂把花蜜吸到它的第二个胃 ——“蜜胃”里面，在那里
进行消化（让花蜜中的蔗糖大部分转化成果糖和葡萄糖），回到蜂巢吐出来，让水分蒸... 阅读全帖 |
|
H****g
发帖数: 14447 | 47 1. 证实了毛泽东1975年写给周恩来这首诗。
《江山靠谁守·诉衷情》
当年忠贞为国筹，
何曾怕断头？
如今天下红遍，
江山靠谁守？
业未竟，
身躯倦，
鬓已秋。
你我之辈，
忍将夙愿，
付与东流？
2. 证实了1976年之前根本没有所谓饿死三千万或者大饥荒之说。
3. 毛泽东1975年的担心，或者说1964年的担心，都变成了现实。
4. 毛泽东唯一的遗产就是留给人民的造反精神，终将成燎原之火。
Mao Tse-Tung: Father of Chinese Revolution
By Fox Butterfield
Special to The New York Times
HONG KONG, Sept. 9--Mao Tse-tung, who began as an obscure peasant, died one
of history's great revolutionary figures.
Born at a time when China was wracked by civil strife, beset with terrible
poverty and enc... 阅读全帖 |
|
l*****o
发帖数: 26631 | 48 我去年试的这个recipe, 前面准备时间有点长， 烤的时候比较简单
Crisp-Skin High-Roast Butterflied Turkey with Sausage Dressing
Serves 10 to 12
If you prefer not to brine your turkey, we recommend a kosher bird. The
dressing can be made with cornbread, challah, or Italian bread, but note
that they are not used in equal amounts. If you don’t own a
broiler pan top or if yours does not span the roasting pan, try a sturdy
wire rack that rests comfortably on top of a 12 by 16-inch disposable
roasting pan. Cover the rack with a la... 阅读全帖 |
|
E**********T
发帖数: 7949 | 49 Everyone likes to meet a charming guy! We always need to make ourselves look
younger. Before we spend money to buy the expensive skin care products, try
some natural methods first. You may find a great improvement from just a
little money!
Yogurt Cleanser: it will bring you a good whitening effect.
1 tablespoon yogurt plus 1 tablespoon lemon Juice
Mix the above and coated on the face, then wash with warm water. Then apply
your usual toner and moisturizing products.
Firming Cream, your skin will ... 阅读全帖 |
|
