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全部话题 - 话题: transformation
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w*******y
发帖数: 60932
1
Link to all KRE-O Transformers at Amazon:
http://www.amazon.com/s/ref=nb_sb_ss_i_0_4?url=search-alias=toy transformers&sprefix=kreo#/ref=sr_nr_p_4_0?rh=n:165793011,k:kreo transformers,p_85:2470955011,p_lbr_one_browse-bin:Transformers,p_4:KRE-O&bbn=165793011&sort=relevancerank&keywords=kreo transformers&ie=UTF8&qid=1323285057&rnid=197718011
#/ref=sr_nr_p_4_0?rh=n%3A165793011%2Ck%3Akreo+transformers%2Cp_85%
3A2470955011%2Cp_lbr_one_browse-bin%3ATransformers%2Cp_4%3AKRE-O&bbn=
165793011&sort=releva... 阅读全帖
w*******y
发帖数: 60932
2
Transformers: Dark of the Moon was released in theaters on June 29th, 2011,
earning over $351 million dollars domestically and over $1,118,000,000
BILLION worldwide, the second highest grossing movie (so far) in 2011.
Featuring a $195 million production budget, every penny shows on the screen.
Michael Bay, who needs no introduction here, said that this is the final
Transformers movie in the trilogy of films he plans on directing. Ditto for
Shia LaBeouf, who said this is his last Transformers mov... 阅读全帖
w*******y
发帖数: 60932
3
Hi everyone! Like most out there, I am already stocking up for Christmas
and came across this coupon that may come in handy. Target.com currently
has a printable coupon for $5 off any Transformers Dark of the Moon toy
purchase of $5.99 or more. The starting price for these toys online are $9.
99. I have yet to see the selection of toys that are eligible in store to
see if there are any that are priced for less. Anyhow, $4.99 for a
Transformers Action Figure after coupon still isn't too sha... 阅读全帖
G*******y
发帖数: 99
4
fourier transformation is used to represent and calculate things in the freque
ncy domain instead of the time domain. laplace transform is almost the same th
ing as the fourier transform, and is the same thing as the fourier domain when
the real component is zero, as the laplace transformation uses the symbol S,
and the fourier transform uses jW, and S = a + jw, and is used to calculate th
ings in frequency domain for continuous signals, z transform is the parallel t
ransformation to laplace, ex
w*******y
发帖数: 60932
5
Transformers: Dark of the Moon was released in theaters on June 29th, 2011,
earning over $351 million dollars domestically and over $1,123,000,000
BILLION worldwide, the second highest grossing movie of 2011. Featuring a $
195 million production budget, every penny shows on the screen.
When it was released on DVD and Blu-Ray on Sept. 30th 2011, it sold more
than 2,628,787 units, earning over $44 million in sales revenue. For those
of you who saw my New Release Thread on the original release of t... 阅读全帖
y*****n
发帖数: 5016
6
来自主题: Statistics版 - How to transform predictor variable?
1. 在业界里做模型,变量的选定要考虑business sense, 即每个变量都必须有比
较好解释的business上的含义。所以,不是每个变量都可以随意transform的。比如说
,也许你发现在regression 里用FICO的log form 比FICO本身significant, 但是你能
用FICO的log form作为模型的一个变量吗? log(FICO)在business上是啥意思?所以,
不用浪费时间,你老板是不会认同的。
2. 也许你在想理论上怎么样怎么样,但是业界里做模型的实际情况是:如果一个
变量自身在regression 里不significant的话,那么怎么transform都是不会变成非常
significant的。
3. 如果你一开始有好几百个变量,如果每个都去试各种不同的transformation的
话,是根本不可行的,不管是对你还是对机器来讲。
4. 所以,我的做法是:首先都用变量original form (有eminer的同学可以用
interactive grouping 变成 woe)做variable sele... 阅读全帖
w*******y
发帖数: 60932
7
Amazon has posted the $5 off coupon for transformer toys, Brings some under
$5, plus free shipping, some with no prime required (for those listed).
Mechtech Deluxe Ratchet - $4.88 AC, FS - No Prime needed:
http://www.amazon.com/Transformers-Dark-MechTech-Deluxe-Ratchet
Mechtech Deluxe Bumblebee - $4.88 AC, FS w/ Prime:
http://www.amazon.com/Transformers-Dark-MechTech-Deluxe-Bumbleb
Mechtech Spike Witwicky & Backfire - $4.97 AC, FS - No Prime needed:
http://www.amazon.com/Transformers-MechTech-Sp... 阅读全帖
b*****t
发帖数: 9671
8
Transformers 3拍摄现场发生撞车意外!
%u7531 Kun Wang %u65BC 4 hours %u4E4B%u524D%u53D1%u5E03
Transformers 3(变形金刚3)正在紧锣密鼓的赶拍中,但不幸的在美国华盛顿当地时
间10月11日拍摄时出了一场车祸意外。Transformers 3的拍摄剧组人员在华盛顿市某街
道拍摄一场"Camaro-大黄蜂"与其它车辆在追逐的场面,在正式拍摄时,突然有一辆真
正的SUV警车进入拍摄现场,Camaro煞车不及直接撞上了这辆警车。
这名驾驶Chevrolet(雪佛兰)警车的警察是一名拆弹专家,他收到情报获知在
Transformers 3的拍摄地点附近有可疑的包裹,因此他便驾车到现场了解。由于这辆警
车上的无线电频道与负责Transformers 3现场管制的保安警察不同,因此这名警员可能
是在不知情的状况下误闯进拍摄现场,而发生车祸。
撞车后,SUV上的警察伤势虽不大,但仍需送医院治疗,至于Camaro上的驾驶则无受到
任何伤害,也无其它人员受伤。其实这己不是Transformers 3在拍摄时的第一个意外,
在... 阅读全帖
n******r
发帖数: 1247
9
来自主题: Statistics版 - How to transform predictor variable?
同意,所以没有说具体方法,因为方法很多,即使同一个公司,方法也不断的在改进。
目前做project我们用treenet从近千个选到top50,
然后做empirical analysis,transformation, regression选变量,加interaction,
这几步反复。
以前有先对变量cluster,主成份,快速选取的。最复杂最慢但效果最好的有在
logistic regression里,对somer's D做敏感度分析一个一个选的。treenet的好处
是data preparation方便,linear nonlinear关系都能找到,top 50变量,加上
interaction一般模型可以达到很好的效果。
再具体也不说了,这个东西是靠日常在实际运用中积累经验的,不是广靠听就能会的。
对于面试被问到如何从上千个变量里选,我个人的观点是,除非你有过实际操作的经验
,否则也只能说听来的皮毛,不要太指望能和有经验的面试者做深入讨论。
对于楼主被问到的transformation的问题,这个对即使没有大型数据处理经验的fresh
graduate也是fair quest... 阅读全帖
w*******y
发帖数: 60932
10
Transformers Dark Of The Moon Mechtech Voyager Class Fire Burst Optimus
Prime
Link:
http://www.target.com/p/Transformers-Dark-Of-The-Moon-Mechtech-
Transformers Dark Of The Moon Mechtech Voyager Class Sentinel Prime
Link:
http://www.target.com/p/Transformers-Dark-Of-The-Moon-Mechtech-
Transformers Dark Of The Moon MechTech Voyager Class Shockwave
Link:
http://www.target.com/p/Transformers-Dark-Of-The-Moon-MechTech-
w*******y
发帖数: 60932
11
Transformers Rescue Bot - Boulder The Construction Bot
Link:
http://www.amazon.com/Transformers-Rescue-Bot-Boulder-Construct
Transformers Rescue Bot - Chase The Police Bot
Link:
http://www.amazon.com/Transformers-Rescue-Bot-Chase-Police/dp/B
Transformers Rescue Bot - Blades The Coptor Bot
Link:
http://www.amazon.com/Transformers-Rescue-Bot-Blades-Coptor/dp/
w********u
发帖数: 71
12
那位大虾给讲讲以下三种不同的变换?
Fourier Transform, Laplace Transform, z-Transform
它们都各属于什么数学范畴?都有些什么不同的应用?
多谢!!!
s********p
发帖数: 637
13
来自主题: Statistics版 - How to transform predictor variable?
受教了,很有启发
我就回复一点,既然你提到了我上面说的“写macro把各种常用的transformation都做
一遍,然后用自动选个walds最大的。这样做的问题是所有的transformation可能都很
烂”,我就解释一下。你说的,我同意,如果所有的transformation都很烂的话
,就基本能决定这个变量没有什么太多用或可以由其他变量替换,不必过多纠结。我一
般是在50个变量左右的时候进行变换筛选,实际上,对于比较重要的变量,10次有5次(大约吧)能找到比较好的变换,对modeling 很有帮助。
我不觉得我的方法有多好,不fancy,又没什么理论,虽然简单,但实际工作中却是有效。想想,如果常用的3,40个简单变换都不能比较好的拟合,那种假设存在的transformation还有什么意义?我虽然反驳过yuxuxin,但我的看法和他还是基本一致的,变量本身如果很不significant,基本上就不要过多纠结了,除非某些原因非要用这个不可。我这几年做的上百的model基本都是这个样子的。
我以前看过一本书,好像叫database marketing什么的,作者用遗传算法控制参数... 阅读全帖
w*******y
发帖数: 60932
14
Right now, Sears.com has the Asus Transformer TF101-A1 Tablet on sale for $
391.99 and the Transformer Docking Station on sale for $146.99. Through
today, July 2nd, you get an additional 20% off the price of the docking
station when you buy both the tablet and the docking station. That brings
the price of the docking station down to $117.59.
Add $6.95 for shipping on the two items, and taxes for me in Connecticut
came to $32.80.
Shop At Home has Sears.com at 20% cashback this weekend. Based ... 阅读全帖
c****n
发帖数: 2031
15
en, and z transform has the similar relation with Fourier series (i.e.
Fourier transform for sequences).
s********p
发帖数: 637
16
来自主题: Statistics版 - How to transform predictor variable?
For /positive/negative values, you can transform the variable into binned variable, which is very useful in capturing non-linear relationships between inputs and target. Something like interval->ordinal.
Log is not always the optimal. Sometimes sqrt/sqr/cub et al are better.
You can list 20/30 transformation formulas often used, put transformed
variable into a regression along with the target and find the best
transformation with the largest chi-squares. It could be done by a macro
easily.
s*********e
发帖数: 1051
17
来自主题: Statistics版 - How to transform predictor variable?
never expect this topic will become so hot.
i am wondering if it is related to monotonic or non-monotonic transformation
. for non-monotonic, then it is extremely simple. WoE should govern all
monotonic transformations.
a simple test to do is to simulate as many monotonic transformations as you
can and then to calculate WoE for all. I am sure you will get the same
result.
for non-monotonic transformation, it might be little tricky. however, you
can always use spline to approximate it out and th... 阅读全帖
w*******y
发帖数: 60932
18
来自主题: _DealGroup版 - 【$】Transformers - $3 to $5 Hasbro.com
Free shipping on orders over $50 - I added Marvel Universe figures,
including discounteed Wolverine and Spiderman figures. Retail on the
transformers was 10.99 to 21.99
All Transformers
Link:
http://www.hasbrotoyshop.com/action-figures-transformers?CD=2&BR=496&PG=1&ST=PR
Optimus Prime
Link:
http://www.hasbrotoyshop.com/action-figures-transformers-animated-voyager-class-optimus-prime?CD=2&BR=496&ST=PR&PG=1
Some other good things marked down.
w*******y
发帖数: 60932
w*******y
发帖数: 60932
20
PS3: Link:
http://www.bestbuy.com/site/Transformers: War for Cybertron - PlayStation 3/9893375.p?id=1218190733586&skuId=9893375&st=transformers: War for cybertron&lp=2&cp=1
Xbox 360: Link:
http://www.bestbuy.com/site/Transformers: War for Cybertron - Xbox 360/9893348.p?id=1218190731681&skuId=9893348&st=transformers: War for cybertron&lp=1&cp=1
w*******y
发帖数: 60932
21
Linky:
http://cgi.ebay.com/ASUS-Eee-Pad-Transformer-32GB-10.1in-Androi
#ht_1436wt_1139" rel="nofollow" target="_blank" onclick="_gaq.push(['_
trackEvent', 'thread', 'click', '3155860 - ebay-daily-deal-asus-eee-pad-
transformer-tf101-nvidia-tegra-2-1ghz-tablet-1gb-ram-32gb-asus-webstorage-10
.1-led-backlight-wxga-wifi-bluetooth-440-free-shipping']);">Linky [Linky:
http://cgi.ebay.com/ASUS-Eee-Pad-Transformer-32GB-10.1in-Androi
#ht_1436wt_1139" rel="nofollow" target="_blank" onclick="_gaq.push(['_... 阅读全帖
w*******y
发帖数: 60932
22
Link here:
http://www.amazon.com/KRE-O-36421-Transformers-BUMBLEBEE/dp/B00
You know Amazon's price can change quickly, so if you want it, get it asap.
If you don't know, the KRE-O Transformers are like Legos (and are
interchangeable with Lego bricks too). You can build the KRE-O Transformer
set into two different things: build the robot form of Bumblebee, and then
disassemble and build the vehicle form of Bumblebee.
Product Features
Build your favorite TRANSFORMERS hero, BUM... 阅读全帖
w*******y
发帖数: 60932
23
Amazon
Few more price drops on toys
Educational Insights Eggspert:
http://www.amazon.com/Educational-Insights-7883-Eggspert/dp/B00
$15
Fisher-Price GeoTrax Disney/Pixar Cars 2 Acer and Talking Holley Shiftwell:
http://www.amazon.com/Fisher-Price-GeoTrax-Disney-Talking-Shift
$4
Fisher-Price GeoTrax Disney/PixarCars 2 Petrov Oilski and Talking Finn
McMissile:
http://www.amazon.com/Fisher-Price-GeoTrax-PixarCars-Talking-Mc
$4
KRE-O Transformers Mirage:
http://www.amazon.com/KRE-O-31145-Transf... 阅读全帖
w*******y
发帖数: 60932
u********u
发帖数: 8196
25
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:
ASUS Transformer (TF101-A1)/ keyboard bundle
单张面值:
?
可接受价格(必须明码标价!):
ASUS Transformer (TF101-A1) 340*7
Asus Keyboard/Docking Statio 80*5
ASUS Transformer with Keyboard/Docking bundle 410/each
物品新旧要求:
new
邮寄方式要求:
your label
买卖双方谁承担邮寄损失(Required if not code only):
before drop off me after you
付款方式说明:
BOA
chase
bill pay
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:
mitbbs
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
PA
h********a
发帖数: 6364
26
我想要的物品:
New ASUS Transformer Prime TF201-B1-GR 32GB $500+My label
transformer prime,不是普通的transformer 32GB
单张面值:
400
可接受的价格(必须明码标价!):
500 + my label
物品新旧要求:
brand new sealed
邮寄方式要求:
drop off
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
bill pay
其他补充说明:
广告的有效期:
till got
物品来源:
hhgregg
我的联系方式:
bbs mail
二手交易风险自负!请自行验证是否合法和一手卡!:
y***n
发帖数: 975
27
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:
1*Transformer Prime 32GB TF201-B1-GR@ $520
单张面值:
1*Transformer Prime 32GB TF201-B1-GR@ $5
可接受价格(必须明码标价!):
1*Transformer Prime 32GB TF201-B1-GR@ $520
物品新旧要求:
new
邮寄方式要求:
your label
买卖双方谁承担邮寄损失(Required if not code only):
default
付款方式说明:
boa, bill pay, ing, chase quickpay
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:
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
h**********0
发帖数: 1467
28
我想要的物品:
Asus Transformer T100TA-C1-GR 64g @ 380
单张面值:
Asus Transformer T100TA-C1-GR 64g @ 380
可接受的价格(必须明码标价!):
Asus Transformer T100TA-C1-GR 64g @ 380 from microsoft store
物品新旧要求:
New Sealed
邮寄方式要求:
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:
我的联系方式:
二手交易风险自负!请自行验证是否合法和一手卡!:
u********u
发帖数: 8196
29
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:
ASUS Transformer (TF101-A1)/ keyboard bundle
单张面值:
?
可接受价格(必须明码标价!):
ASUS Transformer (TF101-A1) 340*7
Asus Keyboard/Docking Statio 80*5
ASUS Transformer with Keyboard/Docking bundle 410/each
物品新旧要求:
new
邮寄方式要求:
your label
买卖双方谁承担邮寄损失(Required if not code only):
before drop off me after you
付款方式说明:
BOA
chase
bill pay
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:
mitbbs
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
PA
h********a
发帖数: 6364
30
我想要的物品:
New ASUS Transformer Prime TF201-B1-GR 32GB $500+My label
transformer prime,不是普通的transformer 32GB
单张面值:
400
可接受的价格(必须明码标价!):
500 + my label
物品新旧要求:
brand new sealed
邮寄方式要求:
drop off
买卖双方谁承担邮寄损失(Required if not code only):
付款方式说明:
bill pay
其他补充说明:
广告的有效期:
till got
物品来源:
hhgregg
我的联系方式:
bbs mail
二手交易风险自负!请自行验证是否合法和一手卡!:
y***n
发帖数: 975
31
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:
1*Transformer Prime 32GB TF201-B1-GR@ $520
单张面值:
1*Transformer Prime 32GB TF201-B1-GR@ $5
可接受价格(必须明码标价!):
1*Transformer Prime 32GB TF201-B1-GR@ $520
物品新旧要求:
new
邮寄方式要求:
your label
买卖双方谁承担邮寄损失(Required if not code only):
default
付款方式说明:
boa, bill pay, ing, chase quickpay
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:
Warranty期限:
能否证明是合法的一手卡?(Required for All Cards!):
state and zip:
h**********0
发帖数: 1467
32
我想要的物品:
Asus Transformer T100TA-C1-GR 64g @ 380
单张面值:
Asus Transformer T100TA-C1-GR 64g @ 380
可接受的价格(必须明码标价!):
Asus Transformer T100TA-C1-GR 64g @ 380 from microsoft store
物品新旧要求:
New Sealed
邮寄方式要求:
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:
我的联系方式:
二手交易风险自负!请自行验证是否合法和一手卡!:
h******c
发帖数: 723
33
来自主题: PennySaver版 - 哪儿买toy transformer 便宜 any deal?
儿子快过生日子, 希望能买点他喜欢的玩具, 哪儿有deal? 了解boy 玩具请多多指导.
这是他的wish list:
1. Transformer bumblebee, 还有一个红色的能变成纯红truck. 在amazon 上找了半天
也沒看见 . 要是哪儿有Transformer详细介绍就好了
2. Powerranger, red ranger,...还有其它什么raanger
3. 还有就是要个什么ibot, or r bot, 不知什么玩意 . 儿子说是cube 形状 与
transformer 有关 我是实在不懂这些 toy. 知道的大侠请指点迷精
4. Race car , red one for himself, blue one for baby brother. 家里已经有3-4
个 lightning McQueen 了 还有其它red race car 么
h********n
发帖数: 1671
34
所以你喜欢拎着带配重电池键盘的transformer到处跑?那还不如带个netbook呢。
Thinkpad Tablet把所有口都设计在pad上正是为了提高便携性,这样就不用随时带个键
盘,也不用故意给键盘加重。ipad薄是以牺牲接口性能为代价的,Thinkpad Tablet定
位于商务用途,本来设计目标就不一样。
Thinkpad Tablet的皮包键盘是个亮点,很新颖的设计,相比之下transformer的键盘就
很老套。一年多以前联想展出的Ideapad U1就是这种键盘,但是因为键盘本身就是一台
全规格笔记本,足够重,所以没有倾覆的问题。
解决pad+键盘倾覆的问题无非就两种思路,加重键盘或加支架。加重键盘影响便携性,
加支架比较难看,所以厂家都会尽量补偿。transformer补偿的办法是用电池加重来提
高电池时间,Thinkpad Tablet的补偿办法是设计一个好看的支架,相比之下还是前者
的思路比较笨一些。
p*b
发帖数: 64
35
Linkin Park - New Divide(《Transformers 2:Revenge of the Fallen 變形金剛2:卷
土重來》主題曲)
[URL=http://img132.hotlinkimage.com/img.php?id=1684389278][IMG]http://img132.hotlinkimage.com/thumb/1684389278.jpeg[/IMG][/URL]
發行時間: 2009年5月18日
地區: 美國
語言: 英語
專輯簡介:
期盼已久的傳說中的 Linkin Park 新單曲《New Divide》隆重登場,該單曲將作為《
Transformers 2: Revenge of the Fallen》(變形金剛2:卷土重來)的主題曲。《
Transformers 2: Revenge of the Fallen》將于6月24日全球上映,同時,該片的原聲
大碟將于6月23日發行。
專輯曲目:
01-New Divide
LYRICS:
NEW DIVIDE
LYRICS BY MIKE SHINODA AND CHESTER BE
w***y
发帖数: 192
36
需要处理荧光显微镜的图像
从图中挑出染色的小点,也就是发光的puncta
看之前其他实验室的文章,算法引用的是这篇paper
Olivo-Marin JC (2002) Extraction of spots in biological images using
multiscale products. Pattern Recogn 35: 1989–1996
但是我对于算法,小波变换这些完全不懂,现在只求能够用来处理数据就好
我现在用的是imageJ,找到Olivo-Marin写得一个a-trous wavelet transformation的
plug-in。但是这篇paper,我最不明白的地方时第三部分:3. Spot detection
我现在搞不明白,这个第三部分就是a-trous wavelet transformation本身可以做到的
,还是是其一个扩展?要在a-trous wavelet transformation上面加新的变换?
它是只是一个单纯的减噪的作用,还是能自动挑出来那些puncta?如果只是减噪,要怎
么来设置threshold来数这些puncta呢。... 阅读全帖
w******4
发帖数: 488
37
【 以下文字转载自 Statistics 讨论区 】
发信人: wangwe14 (Spartans), 信区: Statistics
标 题: 求电子书:The Fourier Transform & Its Applications(包子谢)
发信站: BBS 未名空间站 (Wed Jul 18 15:55:44 2012, 美东)
求电子书: The Fourier Transform & Its Applications (Ronald Bracewell)- 包
子谢!
哪位同学有这本书可以分享一下吗?或者任何讲fast fourier transform的书?
我的信箱是w***********[email protected]
谢谢!!
w**t
发帖数: 592
38
最近看篇文章,提到两个时间序列Xt, Yt:
Xt = a1*Xt-1 + a2*Xt-2 +...+ b1*Yt-1 + b2*Yt-2 +...+ERR1t
Yt = c1*Xt-1 + c2*Xt-2 +...+ d1*Yt-1 + d2*Yt-2 +...+ERR2t
定义lag operator L为 LXt = Xt-1, 上面连个序列重新写成:
|a(L) b(L) | |Xt| = | ERR1t|
|c(L) d(L) | |Yt| | ERR2t|

然后文章提到,Fourier transform both sides of the above equation后变成:
|a(f) b(f) | |X(f)| = | ERR1(f)|
|c(f) d(f) | |Y(f)| | ERR2(f)|
问题:
1. 对于lag operator, 如何用fourier transform? 是把L看作为变量么,如a(L)是L的
函数?
2. 这个fourier transform就是双变量的fou
l***a
发帖数: 12410
39
来自主题: Statistics版 - How to transform predictor variable?
makes sense :)
the reason I don't make a fully automatic macro to do this job is because I
want to factor in some subjective opinion in the decision process. e.g., if
the transformation does have some improvement while not really big (like
improve from 0.85 to 0.87), sometimes I will just use the original var to
make things simple. it depends on the nature of the var and the complexity
of the transformation - kind of a trade off.
so the whole process needs to be reviewed manually. as a result, i... 阅读全帖
n******r
发帖数: 1247
40
来自主题: Statistics版 - How to transform predictor variable?
FICO is in no way more explainable than ln(FICO)
Do you know how FICO is calculated and scaled? How do you know FICO is in a
linear relationship with your target variable?
Fair Issac can one day do a sqrt transformation of FICO and still give it
out as FICO. You still use it the same way or all of a sudden FICO^2 makes
more sense to your boss?
if FICO is not in a good linear relationship with the target, your
prediction can be very off when you look at the performance by different
FICO bands, i.... 阅读全帖
b*****n
发帖数: 685
41
来自主题: Statistics版 - How to transform predictor variable?
我怎么觉得还有一方面的目的是避免outliers caused by long tail?我理解得不对吗?

对于楼主被问到的transformation的问题,这个对即使没有大型数据处理经验的fresh
graduate也是fair question。Transformation的目的是使得prediction尽可能和
target有线性关系,用什么transformation和好不好解释没有关系,用什么变量和解释
有关系。
t**********y
发帖数: 374
42
来自主题: Statistics版 - poisson transformation
最近看到两种transformation 常用poisson distribution 做例子:
log transformation
variance stabilizing transformation
想问下他们适用于那些情况,有什么区别?
多谢!
s********1
发帖数: 235
43
一般什么样的数据,分析起来要做log transformation?以前读书的时候,教授在黑板
上画了一个变量的值的分布,有学生在底下说,这样的变量不能直接分析,要先做log
transformation,现在也忘了变量的分布曲线是怎样的。现在就问一下,怎样的数据,
要先做log transformation 再分析?多谢!
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