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2019-2-9 15:51:58
机器人记者崛起了,但人类记者不用害怕

https://mp.weixin.qq.com/s/gyrLB75CxkP0j3Y7rYCbKw
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2019-2-9 15:55:13
与Amnon Shashua的1小时:详解Mobileye自动驾驶进阶之路

https://mp.weixin.qq.com/s/9CCU13LtqhsBBZmAYqtsnw
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2019-2-9 15:58:45
昨日阅读1小时。 总阅读时间111小时
Invest Like a Guru – How to generate higher returns at reduced risk with value investing 2017(Charlie Tian)
https://bbs.pinggu.org/thread-6755810-1-1.html (Page 142-167)
How to Evaluate Companies
阅读到的有价值的内容段落摘录
Valuation approaches can be divided into three categories: (1) valuation ratios, (2) intrinsic values, and (3) rate of return.
In real business, earnings never stay unchanged. If a company grows its earnings, it takes fewer years for the investor to earn back the cost of buying the stock. If a company’s earnings decline, it takes additional years. As a shareholder, you want the company to earn back the price that you paid as quickly as possible. Therefore, lower P/E stocks are more attractive than higher P/E stocks, as long as the P/E ratio is positive. Also, for the stocks with the same P/E
ratio, the faster-growing business is more attractive. The fair P/E ratio of a stock is about the growth rate of the company, according to Peter Lynch. Related to P/E ratio, Lynch likes to superpose the price chart with a line that is at 15 times trailing-12-month earnings and compare the relative positions of the two lines. He called this line the earnings line, which is now better known as the Peter Lynch Earnings Line. The chart with the price line and the earnings line is now known as the Peter Lynch Chart, as popularized by GuruFocus.com. In his excellent book, One Up on Wall Street, Lynch used many of these charts to illustrate the valuation of stocks.
Price/Sales Ratio is an excellent valuation indicator if you want to compare a stock with its historical valuations or with other stocks in the same industry. It does not measure how long it takes for investors to get paid back like P/E ratio does; it gives only a relative valuation. P/S ratio is a great tool for evaluating cyclical businesses where P/E ratio works poorly. It works better for cyclical companies when, over time, the company’s profit margin reverts to the mean. Again, in the example of Southwest Airlines, although its earnings have had many ups and downs, like a rollercoaster, the company’s revenue has been going up relatively steadily. If we replace the median P/E earnings line with the median P/S earnings line in the Peter Lynch Chart, the chart clearly shows when it is a good time to buy the stock and when it is a good time to get out. Unlike the valuation ratios P/E and P/S, which are the price relative to the earnings power, P/B ratio measures the valuation of the stock relative to the equity of the company. It does not suggest anything about the operation of the company. Instead, it compares the price and the underlying assets of the company. Benjamin Graham liked to compare the stock price with the book value of the shares and buy the ones that were sold at below book value, that is, P/B < 1. P/B ratio works well for the companies that are asset heavy and whose earnings power comes mainly from the business’s tangible assets. For financial services companies such as banks and insurance agencies, the most useful valuation parameter is price/book ratio. Financial companies follow mark-to-market accounting rules. They are required to record their assets at the fair values traded in the market. Most of the assets of financial companies are traded in the market and have market prices. The balance sheet items such as assets and liabilities reflect their current market values. Therefore, the shareholders’ equity on the balance sheet of financial companies is very close to the net worth of the companies’ assets in the current market. One can also try to value a bank or insurance company based on its earnings power. But for financial companies, it’s very hard to distinguish the items that are needed for calculation: the change of working capital, capital expenditures, debt, and so on. Furthermore, banks and insurance companies’ true profit and loss can be very different from their reported earnings. The provision for loan loss in banks and the loss reserve with insurance companies are quite subjective, and they drastically affect the reported earnings. The true earnings from their current business activities are usually unknown until many years later, when the loan default or insurance loss happens during bad economic times.
Although it seems that we don’t value the earnings power of financial companies if we just look at their book values, in fact most of their earnings power is already reflected in the prices of their assets, whether they are bonds, stocks, mortgages, or other marketable securities. A bond can sell at above or below its face value depending on changes in the interest rate and credit quality. Mortgages are sold from one bank to another at the prices that reflect their ability to generate profit.
阅读到的有价值信息的自我思考点评感想
For investment returns we are looking forward returns then historical returns. Forward rate of return is a method that Don Yacktman applies in his investment approach. He defines forward rate of return as the normalized free cash flow yield plus real growth plus inflation. He views stocks as bonds, so it makes more sense to value an investment by the potential rate of return, just like with bonds. Forward rate of return is calculated as:
Forward Rate of Return = Normalized Free Cash Flow ∕ Price + Growth Rate
Both earnings yield (forward looking) and forward rate of return calculations can also be applied to the overall stock market. The results can be used to compare it with the returns on certificate of deposits, money market funds, and bonds. An equity risk premium over risk-free rate from short-term government bonds is usually required by investors because of the volatility and uncertainty of stock investments. This is also how the interest rate affects the attractiveness of the stock market from the aspect of the potential rate of return.
Investors should not be obsessed with the valuation calculations. All calculations involve assumptions. They are valid only if the underlying businesses perform as expected. Over the long term, investment return is more a function of business performance than the valuation, unless the valuation goes extreme. More effort should be put into identifying good businesses and buying them at reasonable valuations.
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2019-2-9 16:06:15
图灵奖得主长文报告:是什么开启了计算机架构的新黄金十年?

https://mp.weixin.qq.com/s/f4s927s5DBTsEgjLLSBq0A
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2019-2-9 18:34:41
昨天阅读1小时,累计阅读333小时。
昨天学习了经济学中不完全竞争经济学学派的思维,不完全竞争经济学学派的始祖是位桥大学教授的妻子─琼·罗宾逊(Joan Robinson),在她所发表的『不完全竞争经济学』一书中分析当时全新的经济理论,在这本书发表后的几个月,美国经济学家爱德华·张伯伦(Edward Chamberlin)也发表类似的理论,书名为『垄断竞争理论』。在罗宾逊和张伯伦的时代,经济学家都抱持着完美竞争的理论。这个理论的出发点是存在着许多买家和企业。每个企业售卖的产品都是一样的,他们之间存在着竞争,每一方与整个市场相比都是微不足道的。企业希望实现利润的最大化,但是不能仅靠抬高价格。如果这样做的话将会使顾客流失。在工业革命初期,企业的规模都比较小,通常以家族方式运作,由一人管理。但是随着企业的精细化程度越来越高,世界与完全竞争模式的差异就越大。取代完全竞争的是其反面,即垄断理论,它检验当市场由一个单独的企业供货时是如何运转的,二人的观点结合了垄断和竞争的各个特点。张伯伦认为广告有助于企业产品从同类竞争产品中脱颖而出。甚至有时广告并不是向消费者宣传产品的实际性能,而是为了创造一种“品牌形象” ,广告可以向消费者传达企业产品与众不同的特质。通过这种差异性,企业在同类品牌的竞争中得到了一小部分的垄断权。罗宾逊和张伯伦的理论因为混合了竞争和垄断,因此被称为“垄断性竞争”(monopolistic competition)。它的另一个名字是“不完全竞争”(imperfect competition),“不完全”是因为即便在企业间存在竞争也并不等同于在完全竞争行业中的那种情况。继罗宾逊和张伯伦之后,经济学家们开始研究“寡头垄断”(oligopolies),即由少数大企业所控制的市场的运作方式。它们并不像垄断竞争公司那样通过推出极具竞争力的产品线获得利润,有时候它们会创立企业协会,通过共同瓜分市场来提升利润。有时候会在价格战中彼此厮杀,通过价格竞争把对方排挤出市场。罗宾逊的理论并没有捕捉到这些策略类型。
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2019-2-9 18:35:28
充实每一天 发表于 2019-2-9 07:08
【加入充实计划】【了解充实计划】
|新充实挑战|    |每日计划清单|
| 【充实积累】| |【充实挑战项目】| ...
昨天阅读1小时,累计阅读610小时
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2019-2-9 18:56:08

昨日阅5小时,累计阅读568小时
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2019-2-9 19:00:58
充实每一天 发表于 2019-2-9 07:08
【加入充实计划】【了解充实计划】
|新充实挑战|    |每日计划清单|
| 【充实积累】| |【充实挑战项目】| ...
昨日阅读1小时,累计阅读3小时
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2019-2-9 19:31:11
昨天阅读1小时,累计阅读9小时。
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2019-2-9 19:34:06
昨日阅读1小时,累计阅读99小时
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2019-2-9 19:35:21
充实每一天 发表于 2019-2-9 07:08
【加入充实计划】【了解充实计划】
|新充实挑战|    |每日计划清单|
| 【充实积累】| |【充实挑战项目】| ...
昨天阅读1小时,累计阅读80小时
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2019-2-9 19:42:38
昨天阅读1小时,累计阅读400小时。
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2019-2-9 19:45:14
今日阅读一小时,Nudge: Improving Decisions About Health, Wealth, and Happiness,5%->7%,累积阅读时间22小时。
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2019-2-9 20:21:01
昨日阅读时间1小时,总阅读时间400小时
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2019-2-9 20:29:13
韩寒的“新商业理想国”还能飞驰多久?

https://mp.weixin.qq.com/s/VWb-ZqGXYuatd6ayzu6IMQ
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2019-2-9 20:29:21
昨日阅读1小时,累计阅读341小时
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2019-2-9 20:35:12
县城里的房产中介江湖

https://mp.weixin.qq.com/s/nUKyh5qmbYmeV5x5Pnv66A
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2019-2-9 20:37:15
昨日阅读3小时,总计30小时

ch1. 绪论

    (li)SVD矩阵分解技术改进传统推荐算法,从而帮助推荐平台缓解Web大数据过于稀疏问题。
    (于洪)时间权重信息与用户-项目-属性三分图相结合,根据用户时间权重建立用户积性模型,从而能在一定程度上缓解推荐算法中新项目的冷启动问题。
    (Kluver)融合传统的基于用户的协同过滤(UserCF)、基于物品的协调过滤(ItemCF)和SVD推荐算法,完善了新用户的推荐问题。
    聚类技术、排序学习技术、深度学习技术、逻辑回归技术等数据挖掘技术方法与传统推荐算法相结合。

    多样化推荐结果是优化推荐算法的一个重要方向。(提高推荐集合的准确性为主要目标的推荐算法有其局限性)

    查询词推荐

    本书主要介绍近几年Web大数据分析及推荐方面的一些研究成果(微博大数据分析与推荐方法、Web大数据多层级推荐方法、融合评分矩阵和评论文本的推荐方法、基于社团聚类的推荐方法、基于用户行为的混合推荐方法、融合隐性特征的群组用户推荐方法、分布式群组推荐方法)

ch2. 微博大数据分析与推荐方法

    基于LDA的语义抽取(latent dirichlet allocation)
    LDA是一种文档主题生成模型(三层贝叶斯概率模型,包含词、主题、文档三层结构),文档到主题服从Dirichlet分布,主题到词服从多项式分布。
    LDA也是一种非监督机器学习技术,可以用来识别大规模文档集(document collection)或语料库(corpus)中潜在的主题信息。
    作者用C语言来实现LDA的EM算法(用Python打印)

    另实现了查询词推荐算法

ch3. Web大数据多层级推荐方法
ch4. 融合评分矩阵和评论文本的推荐方法
ch5. 基于社团聚类的推荐方法
ch6. 基于用户行为的混合推荐方法
ch7. 融合隐性特征的群组用户推荐方法
ch8. 分布式群组推荐方法

非常专业,读不下去了。
留待专业研究者(博士/博士后)
The End

转向下一本:从企业角度的大数据基础架构及相关技术实践。。
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2019-2-9 20:37:19
微软恳求用户:IE不再是正经浏览器,别用了


https://mp.weixin.qq.com/s/WR7THcHoHE1VRfefUtSdQQ
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2019-2-9 20:39:04
昨日阅读1小时,累计阅读364小时
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2019-2-9 20:40:33
闲鱼上的创业青年

https://mp.weixin.qq.com/s/9QqqjQPo2uc2HwkK9zHpWg
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2019-2-9 20:41:05
让你惊艳的苹果广告,背后到底藏了多少秘密?

https://mp.weixin.qq.com/s/IK7G94VBXiMw6UAKbUZmlA
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2019-2-9 20:53:01
骁龙 712 移动平台正式发布,高通也开始挤牙膏了

https://mp.weixin.qq.com/s/EonhTXnrQZZDqZ5UOgfB1g
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2019-2-9 20:53:24
今天阅读1小时,持续每天阅读累计120小时。
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2019-2-9 21:13:21
昨日阅读1小时,累计阅读13小时
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2019-2-9 21:16:11
昨天阅读1小时,累计阅读392小时
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2019-2-9 21:22:20
昨日阅读1小时,累积阅读187小时
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2019-2-9 21:37:30
昨天阅读5小时,累计阅读60小时
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2019-2-9 21:37:49
昨天阅读5小时,累计阅读60小时
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2019-2-9 21:49:01
昨日阅读2小时,累计阅读700小时
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