于文樂

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Biggest Revelations from This Weekend's Spring Games

College football spring games can be notoriously difficult to read. In the modern era, most games are televised or streamed, making it easy for early-season opponents to analyze them and take whatever conclusions they can into preparations.<p>Formations are often vanilla, and a wide variety of unusual …

College Football

那些年我們一起睡的統計學:算變異量為什麼要除以n-1?什麼又是「自由度」?

樣本變異量是基本統計學一個很難懂也很難教的概念。初學統計學的學生一開始就遇到這個概念,如果沒學懂,很可能就對統計學喪失了信心或興趣。這個概念難懂之處並不只在於它的意義或用處,更在於它的公式:<p>這個公式的分子是所謂「差方和」(sum of squared deviations),還不算太難懂。真正難懂的地方是分母:如果要求「平均差方」(mean squared deviations,應該把差方和除以n,為什麼要除以n-1?<p>一般老師對這個問題通常會回答說因為分子使用了樣本平均數,失去了一個「自由度」(degrees of freedom),所以除以n-1。有的老師還會進一步說如果計算差方和使用的不是 …

Leica M – The Full Review

It was early in 2014, long enough after the introduction of the Leica M (also known as the ‘Typ 240’, or ‘M10’) when I finally bit the bullet and …

Cameras

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嚴選 5 大-Apple 推薦年度 iPhone 必備 app

如果一開機就預載這 5 個 app 就更好!<p>打開手機幾版 Folders 近千個 app,其實常用的有幾多個?Apple 嚴選 5 大 app,並非高居 app Store 排行榜的常客如 facebook、Instagram 那麼沒心思,官方人員是本著「開啟 iPhone 潛能」前題下而作推薦的,到底那個 app 可盡用 Retina 屏幕的優質影像播放技術、高速無線連接、高像素感光前後置鏡頭呢?<p>1Password<p>自指紋認證普及至手機後,很多人覺得密碼將要進入博物館,但指模的私隱性極高,相對像 Apple 為守護用戶加密資料而公然違抗 FBI 與法庭命令的值得信賴企業,有幾多?Apple 建 …

輕食新風潮!全台人氣15間碳烤吐司

The Ultimate Leica M3 Review

<i>This is a syndicated blog post from Emanuele Faja. It and the images in this post are being syndicated with permission.</i><p>This is an old review of mine …

如何打造最舒適的家?

[攝影小教室] 痘痘、雜點都不怕!用 Photoshop / Lightroom 輕鬆修復相片小瑕疵!

用最簡單的文字學習最深奧的攝影知識,請持續關注「攝影小教室」專欄!想看最新的攝影小教室?請訂閱「陳寗說科技」粉絲團並順便按個讚:--拍照出現一些小瑕疵絕對是在所難免的事,有時候為了一些塵點、反光、小雜點而錯失拍照的良機,那才是最大的問題哪!現在不管你用 Photoshop、用Lightroom,雜點 …