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[MATH2421] Probability Edit

Semester of Enrollment: 2014 Spring

Instructor: YU, Chi Wai

Grade: (Good/Bad/...) Good

Comments: MATH-STFM required/minor Actuarial Math既core/CS Elective


(不知Prof Ling既version如何,以下淨講Yu Chi Wai既version)


基於MATH Department開放minor Actuarial math既需求,所以2421兩個sem都會開. Spring係大班主要俾MATH果堆人讀,都有其他major既人讀.


相比2411難好多,呢個course先係入門既Prob. Theory科. counting果part近discrete math程度, ch.2 Probability部分都會講得rigorous,會開始點define sample size,probability etc.

ch.3-4教Distribution 如果頭2part搞唔掂後2課有少少麻煩


2,3 都係2411既extension,多左好多新野.


至於ch.4應該對黎緊讀2421既人黎講係新野黎(筆者知上期2411智偉哥cut左joint distribution),涉及mult cal亦唔易讀亦都好多野.最尾果課較易,較technical.


成個course對比2411,都係以Proof為主(冇Analysis咁難跟得上,D Proof睇多一睇應該唔難明),加上智偉哥MT/Final都會出proof,花多少少心機唔會太大問題.


不過由於個course教既野都非常多同埋考核模式唔同.(LQ based type)再加上智偉哥試過有一年fail過接近3成人時,建議take elective既人要慎重考慮呢科. (或者想讀Prob distribution唔一定讀MATH果邊,ISOM/ELEC都得)


Btw...果course講左唔少唔同種類Distribution....對學fin math/signal/machine learning etc....都有作用

建議唔好走堂...智偉哥份notes好多lone lone填同埋好多proof要抄,堂上講既application都唔少

My suggestion:除非係required yr2 spring要讀,否則讀呢科前請確保自己有足夠既1013,1014底同mult cal底. 有basic analysis底會更佳

Grading: (% of each part, e.g. assignments/midterm/final/lab/....)

10% Assignments(上足堂都會full)

35% Mid-Term

55% Final (Cumulative)

14 Spring 2421 Mean = B- Final算係so far Yu chi wai咁多期較淺,可能今期會難返,上足堂溫足書做夠ex問題唔大

Fail percentage < 3% 

A Range around 16-18% Mid-Term mean 32.41/50 sd 9.45/50

Final 36.87/60 sd 12.42/60 total mean 65.49/100 sd 17.18

My Result:Mid term above 0.48sd final 1.45 total above 1.2sd左右 A



[MATH2421] Probability

Semester of Enrollment: 2015 Spring

Instructor: YU, Chi Wai

Grade: (Good/Bad/...) ok

Comments: MATH-STFM required/minor Actuarial Math既core/CS Elective (懶照copy上面)

個人覺得yu chi wai唔教書唔好,好難catch up. 一開始講一個好簡單既example,之後就去到個超難既問題.上堂前最後睇下sheldon ross本書.

MID TERM前都係得DISCRET RV 同probability, 但同2411最唔同係2421要好多proof ,你要好細心睇每一個細節,無得刷題就搞掂 ,唔好諗住教mt前做下題目做算,mid term考大量既proof

mid term 後難度倍增

上堂教好深既野(e.g. multivariate theory) 用左10mins就算,重會講埋兩個normal standard deviation contour plot呢d concept, 真係好撚難嫁,如果2023既底打唔好基本上要好比心機先catch up到

之後就會出現左好多唔同既distribution

佢解釋個陣會assume左你有mean vector , 將sd化做matrix form等既能力,所以好多人聽唔明

去到最後講MGF 因為佢上堂唔夠時間講,基本上要自修(最緊要睇TEXT BOOK)

最後final份卷好多人都死得好慘,yu chi wai考既係concept唔係好注重你計唔計到個answer

好多題目你寫到第一部,佢都比足8成分你(sosad)

grading方面今年改左

scheme1 mt 35% final55% hw10%

scheme2 mt 0 % final 90% hw 10%(救左好多mt below mean既人)

mt final statistics

mean = 26.97 (full mark50) sd =  11.14

Lower quartile = 20 median = 26 Upper quartile = 34.5

Final: mean: 27.56; sd: 13.87(full mark 60)


Total: mean: 54.19; sd: 20.72