September 2013
Intermediate to advanced
264 pages
5h
Chinese
Content preview from Bad Data 技術手冊
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關鍵字 PPC 範例
|
15
$ cat sample2.txt | \
perl -ane 'print $F[1],"\n"' | sort | uniq -c
2 14
1 15
1 16
2 17
$ cat sample2.txt | \
perl -ne 'chomp; @F = split(/\t/,$_); print $F[1],"\n"' | sort | uniq -c
2 14
1 15
1 16
2 17
對真實的資料庫來說（也就是說包含許多資料點的資料庫），統計直方圖提供一個能夠
被評估的合理近似分散式函數。舉例來說，傳統上你會期望一個公平的圓滑函數。它可
能是一個平坦函數（flat function）、高斯函數（Gaussian，看起來像一座鐘的曲線）或
是指數式的遞減函數（長尾），但圖形中的不連續處應該要被發現，因為它通常代表資
料存在某種問題。
關鍵字 PPC 範例
我認為有個很有用的統計直方圖的範例，就是一個包含兩組約七百五十萬個關鍵字的
預估 PPC 值的資料集合。該資料是由第三方組織所搜集的，而對於他們搜集資料的方
式，僅有非常少的資訊。該資料檔案就是一個以逗點分隔的文字檔案，包含關鍵字以及
PPC 值。
範例
2-2 PPC
資料檔案
waco tourism, $0.99
calibre cpa, $1.99,,,,,
c# courses,$2.99 ,,,,,
cad computer aided dispatch, $1.49 ,,,,,
cadre et album ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.