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Liyun's Blog | Explore The World of Economics

Explore The World of Economics. Places I have been to. An efficient way to give gifts in Stardew Valley. I was playing Stardew Valley recently. well, it consumed much of my weekends. In the game, the player has to give gifts to all villagers to keep a good relationship with them. There is an official page displaying each one's preference, wiki. A network graph that shows how villagers are connected by gifts. Stardew valley gift.csv/Sheet 1-Table 1.csv". This entry was posted in R, Stata, Matlab. In a day...

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Explore The World of Economics. Places I have been to. An efficient way to give gifts in Stardew Valley. I was playing Stardew Valley recently. well, it consumed much of my weekends. In the game, the player has to give gifts to all villagers to keep a good relationship with them. There is an official page displaying each one's preference, wiki. A network graph that shows how villagers are connected by gifts. Stardew valley gift.csv/Sheet 1-Table 1.csv. This entry was posted in R, Stata, Matlab. In a day...

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Liyun's Blog | Explore The World of Economics | blog.cloudlychen.net Reviews

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Explore The World of Economics. Places I have been to. An efficient way to give gifts in Stardew Valley. I was playing Stardew Valley recently. well, it consumed much of my weekends. In the game, the player has to give gifts to all villagers to keep a good relationship with them. There is an official page displaying each one's preference, wiki. A network graph that shows how villagers are connected by gifts. Stardew valley gift.csv/Sheet 1-Table 1.csv". This entry was posted in R, Stata, Matlab. In a day...

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regression anatomy | Liyun's Blog

http://blog.cloudlychen.net/tag/regression-anatomy

Explore The World of Economics. Places I have been to. Tag Archives: regression anatomy. Several ways to solve a least square (regression). As far as I know, there are several ways to solve a linear regression with computers. Here is a summary. Native close form solution: just. We can always solve that inverse matrix. It works fine for small dataset but to inverse a large matrix might be very computations expensive. Where Q is an orthogonal matrix and R is an upper triangular matrix. Therefore,. Especial...

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outliers | Liyun's Blog

http://blog.cloudlychen.net/tag/outliers

Explore The World of Economics. Places I have been to. This is a post I wrote on company's internal wiki. just want a backup here. Three points to bear in mind:. Outliers are not bad; they just behave differently. Many statistics are sensitive to outliers. e.g. the mean and every model that relies on the mean. Abnormal detection is another topic; this post focus on exploring robust models. Make the analysis robust to outliers:. In most cases the signal will be more clear from concentrated subsample.

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Liyun | Liyun's Blog

http://blog.cloudlychen.net/author/admin

Explore The World of Economics. Places I have been to. Page 1 of 22. MSc Economics from Barcelona Graduate School of Economics. An efficient way to give gifts in Stardew Valley. I was playing Stardew Valley recently. well, it consumed much of my weekends. In the game, the player has to give gifts to all villagers to keep a good relationship with them. There is an official page displaying each one's preference, wiki. A network graph that shows how villagers are connected by gifts. November 9, 2016. In a d...

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Coursework | Liyun's Blog

http://blog.cloudlychen.net/coursework

Explore The World of Economics. Places I have been to. Constitutional Law, Yale via Coursera. Introduction to Computer Science and Programming (python), MITx: 6.00.1x via edx. Probabilistic Graphical Model, Stanford via Coursera. With distinction in advanced track. Machine Learning, Stanford via Coursera.100%. Social and Network Analysis, Stanford via Coursera. With Distinction. Elements of Statistical Learning II, Fudan Univ ( lecture notes. Elements of Statistical Learning I, Fudan Univ ( lecture notes.

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Several ways to solve a least square (regression) | Liyun's Blog

http://blog.cloudlychen.net/several-ways-to-solve-a-least-square-regression

Explore The World of Economics. Places I have been to. Several ways to solve a least square (regression). As far as I know, there are several ways to solve a linear regression with computers. Here is a summary. Native close form solution: just. We can always solve that inverse matrix. It works fine for small dataset but to inverse a large matrix might be very computations expensive. Where Q is an orthogonal matrix and R is an upper triangular matrix. Therefore,. I never notice that) and I read the book.

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loyhome.com

落园 » 经济、IT观察与思考|专注经济视角下的互联网

http://www.loyhome.com/category/thoughts-on-economics-and-it

When we were young. August 28, 2016. 从有记忆开始我的记忆开始的很晚，大概6岁以前几乎没什么，12岁以前的我也忘的差不多了，比较一下不同时期的记忆，总感叹小时候的成长是一件很快乐的事情。事情已经变了很多不是么记得一句经典的评论就是，每次回头看看那年的自己，都觉得很[.]. August 21, 2016. May 6, 2016. 第一篇是和MIT 08年搞的那个利用线上价格来监测通胀指数的项目 Billion Prices Project 有关简单来说就是搜集了一堆在线商品的价格然后构造价格指数。 8) The Billion Prices Project: Using Online Prices for Measurement and Research. Alberto Cavallo and Roberto Rigobon. A large and growing share of r[.]. April 25, 2016. 对于理工科来说，极度的打磨抽象和逻辑思维能力是最主要的训练，而对于人文学科则有点考验见海纳百川的功夫如何[.].

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落园 » 读书|专注经济视角下的互联网

http://www.loyhome.com/tag/读书

August 21, 2016. January 10, 2016. 比如今天终于找到时间和理由来一家历史悠久的书店 City Lights Booksellers and Publishers。这个书店一进去就是密密麻麻的书架，然后随处可见的标示提醒着浮躁如我的都市人坐下来，看本书(have a seat read a book)。这本书的名字是， I am the Beggar of the World, Landays from contemporary Afghanistan. Landay大概相当于歌谣，并不一定是用文字暂不论语言记录在纸上，而是以声音的形式进行传播和电子记录这里还要多谢智能手机的发明，很多语音资料得以被很方便的记录下来。 June 27, 2015. The Girl Next Door: The Effect of Opposite Gender. American Economic Journal: Applied Economics Vol. 7, Issue 3 - July 2015. March 8, 2014. January 1, 2013.

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落园 » 少数族裔|专注经济视角下的互联网

http://www.loyhome.com/tag/少数族裔

June 27, 2015. Unintended Effects of Anonymous Résumés. Luc Behaghel, Bruno Crépon and Thomas Le Barbanchon, American Economic Journal: Applied Economics Vol. 7, Issue 3 - July 2015. 怕下次找不到门直接google 落园呗。统计学习精要(The Elements of Statistical Learning)课堂笔记系列. When we were young.

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落园 » 从Variance说起：回归、聚类、残差和方差|专注经济视角下的互联网

http://www.loyhome.com/从variance说起：回归、聚类、残差和方差

December 28, 2014. 前言的废话有种被统计学洗脑的感觉，跟搞统计的接触的有点太多了吧.哎，算了，难得有点感悟记录一下吧.喵。本文试图以一个典型的统计学的思维过程来叙述，呃，可能功力不足，凑合着看吧，也不枉我连续几天做梦都是直方图密度曲线 average treatment effect之类的。废话结束了- - - - - - - - - - - - - - - - - -. 如果让你用自然语言而非统计或者数学公式来讲述这个图，比如你带这你刚上小学的孩子去黄石公园玩，他好奇的在等待这个喷泉喷发，这个时候你应该怎么跟他讲嗯，可以大概说一下，你看基本上呢，你等的时间越久，下一次喷发的时间就越长哦。让我们一起来计时然后小朋友看了一眼图，不服的说到，什么嘛，明明是等了如果超过一小时或70分钟，那么下一次基本上喷发时间才会长(4-5分钟。对于聚类呢，也可以看相应的方差每个类里面的点到类中心的距离平方和 - K-means。残差、频率派与贝叶斯派上面说的其实更多是频率派的东西，我好像没提过什么 posterior 之类的对吧。简单的来说，如果除了随机分组之外我们还能...

loyhome.com

落园 » 英文语法|专注经济视角下的互联网

http://www.loyhome.com/tag/英文语法

July 28, 2015. 要说学英文最难学的是什么，我觉得听说读写的排序应该是写说听读，基本就是越需要自己主动的就越难.尤其是英文作为这么一门规则乱七八糟的语言反正中文也没好哪儿去，很多东西是需要看到了知道了记住了.没太多规律什么。最近跟了edx一门课 English Grammar and Style. 以及在看一本书 The Elements of Style. 其实这门课是给英语母语的人开的、而不仅仅是非母语者 English as a foreign language, EFL)。想想惭愧的是我也不知道中文的语法应该是什么，到底是中文没有什么语法规则呢不太可能，还是我写的不够好呢我觉得是我写的不够好吧. 说来惭愧，我从来分不清什么时候用the 什么时候不用.也其实不太拎的清楚什么时候用that 什么时候用which.看了无数的规则教程什么还是脑子里没概念语感，囧。怕下次找不到门直接google 落园呗。统计学习精要(The Elements of Statistical Learning)课堂笔记系列. When we were young.

loyhome.com

落园 » 读书有感|专注经济视角下的互联网

http://www.loyhome.com/category/thoughts-on-economics-and-it/reading-and-feeling

When we were young. August 28, 2016. 从有记忆开始我的记忆开始的很晚，大概6岁以前几乎没什么，12岁以前的我也忘的差不多了，比较一下不同时期的记忆，总感叹小时候的成长是一件很快乐的事情。事情已经变了很多不是么记得一句经典的评论就是，每次回头看看那年的自己，都觉得很[.]. August 21, 2016. May 6, 2016. 第一篇是和MIT 08年搞的那个利用线上价格来监测通胀指数的项目 Billion Prices Project 有关简单来说就是搜集了一堆在线商品的价格然后构造价格指数。 8) The Billion Prices Project: Using Online Prices for Measurement and Research. Alberto Cavallo and Roberto Rigobon. A large and growing share of r[.]. April 25, 2016. 对于理工科来说，极度的打磨抽象和逻辑思维能力是最主要的训练，而对于人文学科则有点考验见海纳百川的功夫如何[.].

loyhome.com

落园 » 用词|专注经济视角下的互联网

http://www.loyhome.com/tag/用词

July 28, 2015. 要说学英文最难学的是什么，我觉得听说读写的排序应该是写说听读，基本就是越需要自己主动的就越难.尤其是英文作为这么一门规则乱七八糟的语言反正中文也没好哪儿去，很多东西是需要看到了知道了记住了.没太多规律什么。最近跟了edx一门课 English Grammar and Style. 以及在看一本书 The Elements of Style. 其实这门课是给英语母语的人开的、而不仅仅是非母语者 English as a foreign language, EFL)。想想惭愧的是我也不知道中文的语法应该是什么，到底是中文没有什么语法规则呢不太可能，还是我写的不够好呢我觉得是我写的不够好吧. 说来惭愧，我从来分不清什么时候用the 什么时候不用.也其实不太拎的清楚什么时候用that 什么时候用which.看了无数的规则教程什么还是脑子里没概念语感，囧。怕下次找不到门直接google 落园呗。统计学习精要(The Elements of Statistical Learning)课堂笔记系列. When we were young.

loyhome.com

落园 » 关于落园和我|专注经济视角下的互联网

http://www.loyhome.com/me

因此，浅尝辄止了PHP MySQL HTML CSS JavaScript, WordPress. Photoshop, Illustrator, Flash, Zotero 等若干软件。 Life is better when SHARED! 秉承着学而不思则罔，一路忠实的记录着和经济学的缘分. 为了让看不懂中文的朋友们也能keep in touch，还有一个英文博客. 无奈工欲善其事，必先利其器，为了防止自己纸上谈兵，便常年混迹于R语言的大家庭当版主. 喜欢研究的感觉，最关注的就是 social network 在微观层面对于经济活动的影响。除此之外，心也不定，计算机、生物和数学都有所涉足，其他五花八门的工作也做过不少，比如中国联通的推销员、学通社文字摄影记者、学生在线的程序设计员兼页面设计员、Maxthon浏览器的美化组成员负责皮肤开发，拿过一个小奖、WordPress的codex 负责帮助文档的本地化主题制作。 2002-2004.9 第一个网站落园雏形，手工制作，大概总共加起来有十个左右的静态页面外加几个Flash，放在163的个人主页服务上，现在已消失。

loyhome.com

落园 » 日常应用|专注经济视角下的互联网

http://www.loyhome.com/category/website/application

March 26, 2015. For i in {1.20} do mydate=$(date -v-"${i}d" "%Y/%m/%d") echo "- - - Now importing:"$mydate"- - - - " done. Hadoop Arvo Schema 和 HIVE 笔记. March 25, 2015. Arvo schema 很像json.比如这里. Name of the user account on Twitter.com". The content of the user's Twitter message". Unix epoch time in seconds". A basic schema for storing Twitter messages". Arvo to HIVE 可以直接建HIVE external table. (还是上面那个link). CREATE EXTERNAL TABLE tweets COMMENT "A table backed by Avro data with the Avro schema stored in HDF...

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落园 » 异性|专注经济视角下的互联网

http://www.loyhome.com/tag/异性

June 27, 2015. The Girl Next Door: The Effect of Opposite Gender. American Economic Journal: Applied Economics Vol. 7, Issue 3 - July 2015. Parents are concerned about the in influence of friends during adolescence. Using the gender compos[.]. 怕下次找不到门直接google 落园呗。统计学习精要(The Elements of Statistical Learning)课堂笔记系列. When we were young.

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Explore The World of Economics. Places I have been to. An efficient way to give gifts in Stardew Valley. I was playing Stardew Valley recently. well, it consumed much of my weekends. In the game, the player has to give gifts to all villagers to keep a good relationship with them. There is an official page displaying each one's preference, wiki. A network graph that shows how villagers are connected by gifts. Stardew valley gift.csv/Sheet 1-Table 1.csv". This entry was posted in R, Stata, Matlab. In a day...

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