Did you know that one of the pioneers in neural network was an econometrician? This was not an easy book to find, but it was well worth it. The book is a collection of articles written by Halbert White—as in *White* Standard Errors—that rigorously laid the theoretical foundation for the effectiveness of neural nets, including universal approximation, consistency and asymptotic normality of learned parameters. These results fill a much-needed gap for those with a background in statistics.
社評﹕AI革命席捲全球 政府須積極回應 – 20170901 – 社評 – 社評 – 明報新聞網
「人工智能」是今年最熱的議題，人云亦云的情況和三兩年前「大數據」不遑多讓。香港的「AI教育」其實不差：很多中小學都有Lego機械人隊。問題是學生無論多喜歡製作機械人，最終選擇以數據科學作為職業的數目相當少。這一來是因為香港的大學學位分配由政府主導，二來過去二十多年來政商界對科技的不重視，已經使香港的高科技產業遠遠落後週邊地區。
以香港科技積弱的程度，我相信新加坡和深圳一點都不擔心來自香港的競爭。當社會情況每況愈下，香港最大的優勢恐怕快要剩下作為走資港的地步了。
《金融時報》提及我以深度學習—依家興叫「人工智能」—估計車牌拍賣價錢的研究。
My deep learning paper on predicting license plate auction prices made it to Financial Times! This is actually the first paper in a series: followup papers will use the prediction model to look into various investment anomalies. Somewhere down the road there will also be a field experiment where we will provide auction participants with an app to gives them estimates in real time.
(Thanks to James Ko for sending me the article!)
The rumor is that Trump is going to slap a steep tariff on Mexican imports to pay for the border wall. This by itself is not surprising, as it is the only option that could be realistically claimed as making Mexico pay up.
The thing is, it doesn’t make any economic sense.
As anyone with common sense can predict, sellers of Mexican products will certainly shift a significant portion of the tariff to American consumers. Any decent ECON 101 would have taught the logic behind tax burden, and unless Mexico have no alternative use of their productivity, Americans consumers will have to pay a lot.
Some might say buying American would solve the problem. Or does it? Suppose every Americans decide to become true patriots and stop buying Mexican products—most likely out of patriotism to their wallets—such that import from Mexico drops to zero. Guess what? The tariff revenue will be zero. So ironically, the more patriotic Americans are, the more they will be paying for the wall.
This type of nonsense is what makes Trump so dangerous. He doesn’t care about the practicality of his orders and the whole country has no choice but to go along with him.
If Trump can put a gag order on EPA, he probably will try to do the same to BLS in the future. No more unemployment statistics. That would be the easiest way for him to claim credit for creating jobs.
有同學傳來CU Secrets個好grade批鬥大會，說GPA 3.5都怕無second hon云云。少年你們太年輕了，都未上Intermediate Macro，急乜？
Dear students, wait till you went through Intermediate Macro before you say everyone is getting high GPA.
係同一個地方教咗六年書，facebook上面一大部分嘅friends都係學系嘅學生，令到facebook嗰feed亦都好受學生影響。例如今晚個feed成日都係某位女同學嘅個人特寫。
Having taught in the same department for six years, a significant number of my facebook friends are students and alumni. This means that my feed is highly influenced by this group—like tonight, a portrait of a certain female student keeps popping up because too many of my facebook friends “liked” the photo.
