103年國營事業英文門檻推測 (vs去年) - 國營工作討論
By Donna
at 2015-01-03T08:38
at 2015-01-03T08:38
Table of Contents
大家好, 走火入魔的我又來update了~ XD (其實我有出去玩, 也有認真讀書)
說真的~ 這樣的研究與討論真的很有趣, 像是在研究社會心理學~ 哈~
念書+玩耍之餘, 茶餘飯後可以來聊聊~~
現在的統計資料已經收集到35個人了... 就數量上面已經稍微有統計意義
不過對於取樣對象的偏差... 恩... 下面一併做討論
(1) 35位同學的歷年資料 http://ppt.cc/hiFY
藍色算法預測均標 ~ 15.93
黃色算法預測均標 ~ 9.74
心得 :藍色算法是先估計每位同學歷年來平均比均標高幾分,
再去平均每個人的估計均標
這樣的算法應該是可以稍微避免掉[都是考高分的人來報分數]的誤差
可是.... 恩.. 下面再說
而黃色算法是先把所有同學每年平均高過均標多少算出來
但因為98~101年有報分數的同學比較少... 所以9.74的分數參考價值不大
(2) 35位同學的 102 vs 103 年資料 http://ppt.cc/Leky
只看102年的資料的話, 藍色和黃色算法的預測均標相同 ~ 15.63
(2-1)簡單說就是, 這35個同學去年平均考37.04分,今年平均考31分
所以~ 假設均標先生分數也掉了 6.04分,
那今年的預測均標就是 21.67-6.04 = 15.63分
(2-2)第二張圖, 我是照102年分數排名, 比照103年的排名
去年均標先生考26.5名...
假設他今年還是考26.5名.... 那今年分數就落在 17~18.33之間...
仔細看看資料~ ~ 有個相當有趣的現象
那就是 ~ 102年比均標高分的26個人, 有25個人分數都掉了 (平均掉了11分)
102年比均標低分的 9個人, 有 8個人分數提高了 (平均提高8.6分)
這種現象要怎麼解釋哩? 我現在想到有兩種可能
(1) 低分群這9個人,今年分數提高的原因是因為挖奮圖強
(2) 今年的考卷太難,所以高分群的人分數被壓低,但低分群受影響較小
這兩種現象~ 我想應該都是存在的...
但針對(1)的現象....
今年考生14000人, 假設去年低於均標的人也是7000人
這7000個低於均標的同學~ 有可能平均分數會提高8.6分嗎?
我個人是不太相信的...
我寧願相信這是由ptt看世界所造成的誤差,
假設會到國營版上面關心的人是比較努力的族群,所以對英文弱點有下較多功夫
因此造就了(1)的現象
不過,觀察102-103那一行,掉分5分以上的是白色,掉分0~5分的是黃色
綠色則是分數提高的人...
可以發現, 去年的22~26名分數掉分都在5分以內...
可見想像, 今年的考生分數曲線分佈比起去年應該會是標準差更小的高峰狀
這也解釋了(2)的可能
究竟這35位考生的行為,真的能代表14000個考生多少呢?
我想還是見仁見智~
希望有更多同學報分數出來,(尤其是低於30分的族群)
然後我們靜待3月的結果~
無論如何,
大家還是要繼續認真努力,快樂玩耍~
祝大家金榜題名!
Tony
※ 引述《tonycruise (Tony)》之銘言:
: 大家好, 現在已經有22位戰友的資料 http://ppt.cc/~0e0
: 藍色算法 ~ 預測均標 11.52
: 黃色算法 ~ 預測均標 9.76
: 另外若單純只用102年vs103年的資料計算如下 http://ppt.cc/7YtI
: 只用一年資料的話, 兩種算法預測的均標都是 10.83
: 算這個東西~ 到底意義有多大呢? (或這問說信心水準有多高)
: 這問題真的沒辦法回答
: 不過如果我們用98~101年的資料來預測102年 計算如下 http://ppt.cc/-xeG
: 藍色算法 ~ 預測均標 23.95
: 黃色算法 ~ 預測均標 20.58
: 實際均標 21.67 (樣本數只有11位)
: 恩... 究竟準不準... 我想見人見智 :")
: 不過我認為~ 這樣的推測方式, 是肯定比在版上問大家今年考幾分來推測準
: 最後跟大家分享這張圖 http://ppt.cc/4j4H
: 從這張圖可以看出來,
: (1) 22位同學102年的成績排名~ 均標先生是第19.5名
: 可見得在這個版上的大家, 基本上英文程度都還不錯
: 所以如果單純只問大家今年考怎樣, 一定會將均標推論過高
: (2) 有網友說, 我前面的算法是偏向"平均值"的計算方式, 但均標是中位數
: 這是相當正確的說法
: 至於中位數要怎麼推測呢? 我有一個簡單的想法,不知道大家覺得如何?
: 也就是~ 去年均標先生是第19.5名, 雖然103大家的名次和102比起來有些許變動
: 不過基本上前10名還是前10名, 後10名也還是後10名~
: 所以假設 均標先生今年還是 19.5名... 那推論今年分數是在 11~14之間
: 之前三種算法的結果也都落在11~14的估算區間~
: (3) 樣本的問題
: 基本上, 這22位同學平均分數掉了10.84分 (45.18掉到34.35) 而且
: 會不會是因為上來報分數的人, 都是因為今年考得比較差所以才會來報呢?
: 我想這是有可能的~ 愛白大和D大之外, 逆勢成長的只有n2jls3大大
: 所以在這邊呼籲~ 更多的人把你的分數分享一下~ :")
: 格式 → y98:s39.17 / y100:s32 /y101:s47.2 / y102:s32.5 / y103:s16.7
: 希望樣本數至少可以有30個
: 不一定要真的是當年考的分數, 只是自己在家拿前年考卷寫模擬考的分數也可以
: 就某方面來說, 這樣的成績會更好~ 因為實力變異比較小
: 最後~ 也呼籲大家考完之後 好好放鬆心情~ :")
: 出去走走或是開始規劃接下來的讀書計畫...
: 我是因為時間多加上對於數學有興趣才在這邊做這些無聊的計算~ 哈
: 新年快樂!! 今年大家都考上!!
: Tony
--
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