绝妙的瞬间 - 未名空间MITBBS历史存档

国际科技财经博客移民网络热点娱乐民生时事公众号

Redian新闻

>未名空间

>pets - 心有所宠

绝妙的瞬间

绝妙的瞬间# pets - 心有所宠

T12013-03-16 07:03

1 楼

【以下文字转载自 Stock 讨论区】
发信人: T1 (铊), 信区: Stock
标题: 草泥马gulf coast显神功
发信站: BBS 未名空间站 (Sat Jun 12 19:37:55 2010, 美东)
http://i.cdn.turner.com/cnn/.element/apps/cvp/3.0/swf/cnn_416x234_embed.swf?context=embed&videoId=us/2010/06/12/pkg.ri.alpaca.hair.gulf.wpri

m*t2013-03-16 07:03

2 楼

【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 solving this problem. But, they depend on
knowing the whole data set.
Any help would be appreciated.

l*82013-03-16 07:03

3 楼

g*e2013-03-16 07:03

4 楼

天朝再次拯救美国。

context=embed&videoId=us/2010/06/12/pkg.ri.alpaca.hair.gulf.wpri

【在 T1 的大作中提到】

: 【以下文字转载自 Stock 讨论区】
: 发信人: T1 (铊), 信区: Stock
: 标题: 草泥马gulf coast显神功
: 发信站: BBS 未名空间站 (Sat Jun 12 19:37:55 2010, 美东)
: http://i.cdn.turner.com/cnn/.element/apps/cvp/3.0/swf/cnn_416x234_embed.swf?context=embed&videoId=us/2010/06/12/pkg.ri.alpaca.hair.gulf.wpri

t*w2013-03-16 07:03

5 楼

two variables, two equations, give you the closed form solution.
data mean offers an equation,
stdev,same as variance, gives you another equation.
two variables, shape and scale.
Am I missing anything?

N*y2013-03-16 07:03

6 楼

第一张实在是太好笑了

T12013-03-16 07:03

7 楼

真是一物降一物啊，想不到草泥马也有今天这样的辉煌

m*t2013-03-16 07:03

8 楼

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 !

【在 t**********w 的大作中提到】

: two variables, two equations, give you the closed form solution.
: data mean offers an equation,
: stdev,same as variance, gives you another equation.
: two variables, shape and scale.
: Am I missing anything?

m*72013-03-16 07:03

9 楼

好美好阿

【在 l******8 的大作中提到】

f*n2013-03-16 07:03

10 楼

真是奇怪的用途

【在 T1 的大作中提到】

t*w2013-03-16 07:03

11 楼

Then use the probability density function to calculate the conditional mean
and variance, provided you know where it is truncated at.
You should be able to obtain the truncated point through plotting, right?

【在 m******t 的大作中提到】

: 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 !

T*e2013-03-16 07:03

12 楼

草拟马万岁

【在 T1 的大作中提到】

m*t2013-03-16 07:03

13 楼

We know the truncated point.
But, how to use the probability density function to calculate the
conditional mean and std. dev. ?
We do not know the pdf of truncated gamma distribution.
Any help would be apprecitaed.
Thanks !

mean

【在 t**********w 的大作中提到】

: Then use the probability density function to calculate the conditional mean
: and variance, provided you know where it is truncated at.
: You should be able to obtain the truncated point through plotting, right?