今天又扫到一篇很有意思的paper，基本就是说，如果企业看不到应聘者的名字，那么少数族裔被选中面试的可能性就更低。这好像和美国大学录取如出一辙——在学校里比较少见的族裔还是很沾光的。Unintended Effects of Anonymous RésumésLuc Behaghel, Bruno Crépon and Thomas Le Barbanchon, American Economic Journal: Applied Economics Vol. 7, Issue 3 -- July 2015他们的摘要总结的很好（看完就知道他们干了什么了）。We evaluate an experimental program in which the French public employment service anonymized resumes for firms that were hiring. Firms were free to participate or not; participating firms were then randomly assigned to receive either anonymous resumes or name-bearing ones. We find that participating firms become less ...继续阅读 (84)

Just because a chart is correct, it does not mean it’s not misleading. Here’s an example: Back in the USA, on March 12, US SenatorTed Cruzand NASA AdministratorCharlie Boldenwent head to head at a hearing on the President’s FY2016 budget request arguing as to what they thought NASA’s priorities are today. Sen. Cruz is known to be a climate-change skeptic and has often said that NASA should focus on space exploration and leave earth science to other agencies. Although Cruz and Bolden disagreed strongly, reports are that the hour-long meeting was nonetheless cordial. The interesting ...继续阅读 (14)

PicPick是一款优秀的免费屏幕截图工具，汇集屏幕截取、取色器、调色板、放大镜、标尺、量角器、坐标轴、白板等功能于一身。PicPick支持的屏幕截图模式包括：全屏、活动窗口、滚动窗口、矩形区域、固定区域、手绘区域、重复上次截取等，这应该满足绝大部分需求了。截图后默认在PicPick 编辑器中打开，在此编辑器中可以设置图片效果、添加标注信息，然后保存为 BMP、JPEG、PNG 或 GIF 格式。当然也有其他输出方式，如复制到剪贴板、保存为图像文件、输出到 Microsoft Office 程序等。现在的 PicPick 能够显示一个竖向截取栏，可以选择某种截图模式直接开始截图，非常方便，这与 FastStone Capture 的浮动工具条类似。使用说明：绿色便携版直接运行 picpick.exe 即可，简体中文界面，配置自动保存到 picpick.ini，2015/5/31 更新版本为 PicPick 4.0.5，使用了最新的 Ribbon 界面风格，很是精美，PicPick 绿色版也特别为 心有独钟 制作。「截图软件我现在用的是FastStone Capture，堪称完美；PicPick截图保存选项无法修改，只能按程序定义的输出，如 PNG 都是 24 位 PNG，这在想控制文件大小时就不方便了，而 FastStone Capture 提供了完全的输出配置定义，可以轻松灵活输 ...继续阅读 (60)

使用VirtualBox安装RedHat Linux时出现”no valid devices were found”错误，估计是虚拟硬盘这方面的问题。进入RedHat Linux虚拟机设置 -> 存储，看到硬盘的控制器是SATA控制器，于是就添加一个IDE或者SCSI控制器（但是添加IDE控制器不可用），只能添加SCSI控制器，并添加虚拟硬盘。把原来的SATA控制器删除。保存，安装RedHat Linux就不再出现这问题了。我发现在VirtualBox新建虚拟机，选择系统类型时，如果选择Windows XP，则硬盘控制器是IDE的。所以上面这个问题，另一个解决办法是：新建虚拟机时，在选择系统类型时，选择Windows XP就可以了。 ...继续阅读 (27)

Imagine you're building a recommendation algorithm for your new online site. How do you measure its quality, to make sure that it's sending users relevant and personalized content? Click-through rate may be your initial hope‌but after a bit of thought, it's not clear that it's the best metric after all.Take Google's search engine.In many cases, improving the quality of search results willdecreaseCTR! For example, the ideal scenario for queries likeWhen was Barack Obama born?is that users never have to click, since the question should be answered on the page itself.Or take Twitter, who o ...继续阅读 (15)

KDD-2014 was the largest (with over 2300 people) and the best Data Science meeting, highlighting the huge progress of Data Science made with Big Data, and its even more amazing potential.By Gregory Piatetsky,@kdnuggets, Aug 28, 2014.I have just attendedKDD-2014, 20th ACM SIGKDD Conference on Knowledge Discovery and Data Mining, held August 24-27, 2014, in New York City.With an amazing 2,300 people attending (twice the size of KDD-2013), KDD showed that it was not justthe leadingresearchconferencein Data Mining, Data Science, and Knowledge Discovery, but also the largest conference in the field ...继续阅读 (13)

In this post I am goIing to summarize some of the things that I learned at Strata Santa Clara 2013. For now, I will only discuss the conference sessions as I have a much longer post about the tutorial sessions that I am still working on and will post at a later date.I will add to this post as the conference winds down.The slides for most talks will be availableherebut not all speakers will share their slides.Thisis/was my first trip to Strata so I was eagerly awaiting participating as an attendant. In the past, I had been put off by the cost and was also concerned that the conference would be ...继续阅读 (83)

During the past few decades that I have been in graduate school (no, not literally) I have boycotted JSM on the notion that “I am not a statistician.” Ok, I am a renegade statistician, a statistician by training.JSM 2012was held in San Diego, CA, one of the best places to spend a week during the summer. This time, I had no excuse not to go, and I figured that in order to get my Ph.D. in Statistics, I have to have been toat least oneJSM. The conference itself was 5 days, but I did not think I could hang with statisticians for five days, and more importantly, taking three days off th ...继续阅读 (43)

本来想的很多，也想详细的记下所有想法，无奈笔拙罢了，该记得的自然会记住，该忘的不如就忘了吧。《此间的少年》的英文名是“There They Were”，感觉真心好。于是借用一下，就谨以此标题纪念刚刚逝去的大学生活吧。 ...继续阅读 (19)

Note: This would have been up a lot sooner but I have been dealing with a bug on and off for pretty much the past month!From April 26-28 I had the pleasure to attend theSIAM Data Mining conference in Anaheim on the Disneyland Resortgrounds. Aside fromKDD2011, most of my recent conferences had been more “big data” and “data science” oriented, and I wanted to step away from the hype and just listen to talks that had more substance.Attending a conference on Disneyland property was quite a bizarre experience. I wanted to get everything I could out of the conference, but the ...继续阅读 (36)

Cancer treatment may have just taken a big leap into the computer age.Stanford Univeristy reasearchers are reporting significant success in training computers to anaylze microscope slide of breast cancer biopsies, with keener eye than any human pathologist.Since the early 20th century, pathologists have been squinting into the microscopes, looking for a handful of features in biopsies tumers samples, that enable them to classify how agreesive cancer is.That information helps doctors decide how to treat patient.Today, armed with sophisticated software, powerful computers get quiet skill at patt ...继续阅读 (21)

The lecturer claims thatthe new policy, which allows people to work four days a week instead of five, will have negative effects for companies as well as society.This claim is not in agreement with that of thereading passage, which suggests that such a policy will be beneficial.According to the lecture,a company that allows employees to have fewer working hours is likely to hire more people to ensure that it meets normal levels of productivity. If this occurs, expenses for training and medical insurance will inevitably rise.The reading passage, by contrast,suggests that employees who enjoy mor ...继续阅读 (14)

<< My review of Day 1.I am summarizing all of the days together since each talk was short, and I was too exhausted to write a post after each day. Due to the broken-up schedule of the KDD sessions, I group everything together instead of switching back and forth among a dozen different topics. By far the most enjoyable and interesting aspects of the conference were the breakout sessions.KeynotesKDD 2011 featured several keynote speeches that were spread out among three days and throughout the day. This year’s conference had a few big names.Steven Boyd, Convex Optimization: From Embedded R ...继续阅读 (80)

I have been waiting for the KDD conference to come to California, and I was ecstatic to see it held in San Diego this year.AdMelddid an awesome job displaying KDD ads on the sites that I visit, sometimes multiple times per page. That’s good targeting!Mining and Learning on Graphs Workshop 2011I had originally planned to attend the 2-day workshopMining and Learning with Graphs (MLG2011)but I forgot that it started on Saturday and I arrived on Sunday. I attended part of MLG2011 but it was difficult to pay attention considering it was my first time waking up at 7am in a long time. The first ...继续阅读 (70)

I woke up early and cheery Wednesday morning to attend the2011 Hadoop Summitin Santa Clara, after a long drive from Los Angeles and theBig Data Campthat lasted until 10pm the night before. Having been toHadoop Summit 2010, I was interested to see how much of the content in the conference had changed.This year, there were approximately 1,600 participants and the summit was moved a few feet away to the Convention Center rather than the Hyatt. Still, space and seating was pretty cramped. That just goes to show how much the Hadoop field has grown in just one year.KeynotesWe first heard a series of ...继续阅读 (86)

It has been a while since I have been to Silicon Valley, butHadoop Summitgave me the opportunity to go. To make the most of the long trip, I also decided to check outBigDataCampheld the night before from 5:30 to 10pm. Although the weather was as predicted, I was not prepared for the deluge of pouring rain in the end of June. The weather is one of the things that is preventing me from moving up to Silicon Valley.The food/drinks/networking event must have been amazing because it was very difficult to get everyone to come to the main room to start the event! We started with a series of lightning ...继续阅读 (50)

Some time over the past 6 weeks I randomly saw a tweet announcing the “Data Scientist Summit” and shortly below it I saw that it would be held in Las Vegas at theVenetian. Being a Data Scientist myself is reason enough to not pass up this opportunity, but Vegas definitely sweetens the deal! On Wednesday I woke up at 6am to partake on the5.5 hour voyage to Las Vegas.The Pre-PartyThe Venetian and all close hotels were booked, so I ended up at theAria; a new experience. The hotel is beautiful and very ritzy. I had heard that the rooms were very technologically advanced but I wasn ...继续阅读 (190)

题意很简单，就是在一个二维空间有许多星星，给出星星位置以及它们的亮度，用一个正方形包住的星星亮度的总和最大，其实是二叉检索树的题目，黑书上有讲page102，原题（虽然直到现在自己还不是很理解），只不过题干变了而已，这里用了一大段浪漫的情书来引入的，貌似作者是中大的，不过情书的确写的不错，忍不住摘录了下来。。Fleeting time does not blur my memory of you. Can it really be 4 years since I first saw you? I still remember, vividly, on the beautiful Zhuhai Campus, 4 years ago, from the moment I saw you smile, as you were walking out of the classroom and turned your head back, with the soft sunset glow shining on your rosy cheek, I knew, I knew that I was already drunk on you. Then, after several months’ observation and prying, your grace and your wisd ...继续阅读 (21)

A poem some times will be falshing,which we used in a drama called "Go left, leave right". its name is love at first sight. I really love it.Love at First Sight------Wislawa SzymborskaBoth are convincedthat a sudden surge of emotion bound them together.Beautiful is such a certainty,but uncertainty is more beautiful.Because they didn't know each other earlier, they suppose thatnothing was happening between them.What of the streets, stairways and corridorswhere they could have passed each other long ago?I'd like to ask themwhether they remember-- perhaps in a revolving doorever being face to fac ...继续阅读 (25)