ぎょーむ日誌 2003-08-09

2003 年 08 月 09 日 (土)

• 1140 起床． 寝たきり状態というべきだな． C++ 呪われでアタマが壊れぎみなのか? コーヒー． 台風ちかづいているので雨．
• うーむ
• 昼飯． 1430 自宅発． 雨． 1440 研究室着．
• にせ地下部の闇を支配する FakeEarth において座標を centralized する関数いれても 「ぶりっぢ」現象が解決せん …… と思ってよく調べてみると， じつはにせ地下計算の問題ではなく描画させてる R の関数 levelplot の問題とわかった． 勝手によけーな「補間」しやがるんだよね， こいつは …… 解除する方法はまだわからんけど， とりあえず FakeEarth には問題ないと確認した． しかし時刻はすでに 1840． とほほ．
• たたみこみカーネルの最小化するように 関数を書き直してみる． これで計算結果は同じで 7-8 倍は速くなる．
• いろいろ「地上部なし地下部のみ」試験してみる． たとえば， 「逆さ」キラウェア火山のごとき形状なる にせ地下部総重量 750g が 80cm 四方に展開したときに 集める水量年間 325920g っつーのは どんなもんじゃろね (年間降水量 1000mm == 100g cm^-2)． まあ， 「生き残るためには今どれだけにせ地下部を作ればいいのか?」 を決めるのは私ではなく 各ぱいぷ樹木の判断にまかされることになるわけだけど．
• 一個体状態 (ただし地下部のみ) での試験はだいたいできたかな …… ということで 2200 研究室発． 雨． 2215 帰宅． 体重 71.6kg． 晩飯．
• [今日の素読]
  • Salsburg, D. 2001. `` The Lady Tasting Tea -- How statistics revolutionized science in the twentieth century''. Owl Book.
  • Chapter 3. That dear Mr. Gosset (continuation)
    • The birth of ``Student''
    • ``Student'''s t-test
  • The specific problem Gosset attacked dealt with small samples. Karl Pearson had computed the four parameters of a distribution by accumulating thousands of measurements from a single distribution. He assumed that the resulting estmates of the parameters were correct because of the large samples he used. Fisher was to prove him wrong. In Gosset's experience, the scientist seldom had the luxury of such large samples. More typical was an experiment yielding ten to twenty observations. Furthermore, he recognized this as very common in all of science. In one of his letters to Pearon, he writes: ``If I am the only person that you've come across that works with too small samples, you are very singular. It was on this subject that I came to have dealings with Stratton [a fellow at Cambridge Unversity, where] ... he had taken as an illustration a sample of 4!''
  • Thus did one of the great genious of the twentieth century burst upon the scene. Pearson published the young man's note in Biometrika. Three years later, after a sequence of very condescending letters, Pearson published a second paper by Fisher, but only after making sure that it would be seen as a minor addition to work done by one of Pearson's coworkers. Pearson never allowed another paper by Fisher into his journal. Fisher went on to find errors in many of Pearson's proudest accomplishments, while Pearson's editorials in later issues of Biometrika often refer to errors made by ``Mr. Fisher'' or by ``a student of Mr. Fisher'' in papers in other journals.
• [今日の運動]
  • 腹筋運動 30 × 3 回．
• [今日の食卓]
  • 昼 (1410): 蕎麦．
  • 晩 (2300): スパゲッティー． トマト・ピーマン・ニンニク・マイワシの炒めもの．