JotMyThing: 2016

https://www.cfainstitute.org/programs/cfaprogram/courseofstudy/Pages/study_sessions.aspx
https://www.cfainstitute.org/CFA%20Program%20Study%20Session/2017_L2_StudySessions_combined.pdf

Total 52 Readings. Average 7 learning outcome statements per reading. There are total 48 pages just for the list of learning outcomes.

Here I make combine all learning outcome statements from all 4 readings in the quantitative methods part.

Hypothesis Test - Null and Alternative Hypothesis, Significance Level and Confidence Interval, P Value

Here is how I remember things

ANA
SCS
P

When P < S, outside C, we accept A. (i.e. reject N)
When P > S, inside C, we accept N. (i.e. fail to reject N)

Here is the full picture

Alternative Null Alternative
Significance Confidence Significance
P Value

What is null hypothesis?
Null hypothesis is used to denote things that are default, original, native, nothing, innocent, natural, naught. (naught means mathematical zero). It is the native, natural and default state of the object when nothing is happening. It is the main body.

What is alternative hypothesis?
Alternative hypothesis is the opposite of null hypothesis which is used to denote things that are special, changed, modified, added, affected, guilty. It is sometimes called research hypothesis. It is the state when somethings happens, making things changes. It is the tail of the body.

Note: Null hypothesis and alternative hypotheses are mathematically opposite and they all together forms all possibilities. So, ANA is all.

What is Confidence Interval?
The 99%, 95%, 99.9% are the confidence intervals. It means central, confident, normal, default, common, natural, usual, frequent, prevailing, trivial, typical, probable. The high confidence interval is the large probability of default null hypothesis.

Whats is Significance Level?
The 1%, 5%, 0.1% are the significance levels. It means tail, significant, alternative, extraordinary, extreme, exceptional, remarkable, singular, outstanding. It is the Z value at the tails. It is sometimes called alpha, level of significance. The low significance level is the low probability for changed alternative hypothesis.

Note: Confidence interval and significance level adds up to 1, always. So, SCS = 1.

What is critical values?
Critical values is the boundary, cut-off between the confidence interval and significance level on the x-axis of the distribution.

What is p value?
P value is the probability of the sample test statistics which is calculated form the samples drawn from the population. It is compared to the significance level. When p value less than significance level (i.e. outside the tail), it means we reject the null hypothesis (i.e. the body) and accept the alternative hypothesis (i.e. the tail).

Again:

ANA
SCS
P

When P < S, outside C, we accept A. (i.e. reject N)
When P > S, inside C, we accept N. (i.e. fail to reject N)

What is Type 1 Error?
When Null is true but rejected to believe Alternative, Type 1.
以利用驗孕棒驗孕為例，此時未懷孕為虛無假設。若用驗孕棒為一位未懷孕的女士驗孕，結果是已懷孕，這是第一型錯誤。若用驗孕棒為一位孕婦驗孕，結果是未懷孕，這是第二型錯誤。

2016年10月18日星期二

Java Networking and Java NIO Tutorial and Notes

Java Networking
http://tutorials.jenkov.com/java-networking/index.html

Java standard IO works with byte streams and character streams, blocking.

How to create a TCP socket to connect to a server?
Use Socket, getOutputStream, write, flush then close.
Use Socket, getInputStream, read, in.close, socket.close.

How to create a server that listens to incoming TCP connections?
Use ServerSocket, accept, socket.close, serverSocket.close.

How to send data using UDP socket?
Prepare new byte[65508], InetAddress.getByName and DatagramPacket
Use DatagramSocket().send(DatagramPacket)

How to receive data using UDP socket?
Use DatagramSocket to specify the UDP port, byte[], DatagramPacket.receive which is a blocking method.

How to read the HTTP web content?
Use URL and URLConnection.getInputStream

How to create an IP address?
Use InetAddress.getByName("google.com"), getByName("1.2.3.4") or getLocalHost()

Java NIO
http://tutorials.jenkov.com/java-nio/index.html

Java NIO works with channels and buffers, non-blocking, selectors.
A single thread uses a single selector that monitors multiple channels for events like connection opened or data arrived.

Java NIO core classes: Channel, Buffer, Selector

For Channel, the implementations are FileChannel, DatagramChannel, SocketChannel, ServerSocketChannel.

For Buffer, the implementations are ByteBuffer, CharBuffer, DoubleBuffer, FloatBuffer, IntBuffer, LongBuffer, ShortBuffer. They are essentially the 8 Java primitives except Boolean.

2016年10月13日星期四

CPU Marks Windows Experience Index and Sis

Intel i3 2100 3.1Ghz 2 core 4 thread using, with graphic

8GB but 32 bit 2.88GB usable

Intel Graphics Family

X200 P8600 2.4Ghz 4GB

MBP 2010

Macbook pro 13 2010 Mid 2.4Ghz P8600 4GB DDR3 1066Mhz 320M 256MB

Intel HD Graphics 3000

Win 7	i3 2100	MBA2011	x200	A8-5500	G620
CPU	7.1	6.8	6	7.2	6.4
RAM	5.5	5.9	5.9	5.9	5.5
Aero	4.6	5.6	4.1	6.7	4.3
Graphics	5.6	6.2	3.4	6.7	5.7
Disk	7.1	7.2	5.9	5.9	5.9

Sis	i3	MBA2011
Media MPixel/s	72	60
AES GB/s	0.24	1.483
finance kOPT/s	6.21	4.09
Science GFLOPS	6.32	4.59
.NET GOPS	7.82	7.19
Memory GB/s	17.9	12.2
Memory late ns	25.5	31.2
Disk MB/s	173	219
Disk IOPS	4786	1431

	i3	i5 2557m	P8600
GeekBench 3	4786	4023	2303
Dual-Core A4-6300	2258	2088	1388

AMD	A4-6300 Dual	x4 860K	A10-7850K	A8 7650K	A8 6600k
Price	$266	$526	$789	$674
GeekBench 3	2972	7520	7022		6071
GeekBench 3 Single Core	1913	2478	2328		2132

2016年8月30日星期二

小米路由器MINI速度測試 Xiao Mi Router Mini Speed Test 及小米路由器變身Web Server

我正在使用小米路由器MINI(R1CM)，ROM: MiWiFi 穩定版 2.8.14，Model: R1C, Input 12V/1A，使用港版三腳火牛，有USB2.0，內建的硬體規格為採用MTK的MT7620A 580MHz處理器+128MB DDR2記憶體，ac雙頻2X2天線。LAN的規格為10M/100M，支援無線 802.11ac協定以及5GHz頻段無線速度、雙頻併發速率最高達1167Mbps。

參考測速
最近看了這文章，中華電信 100M/40M所測得：
2.4GHz 46Mbps 38Mbps
5Ghz 90Mbps 40Mbps
下一層樓，WiFi收訊都只剩2格
5Ghz 3Mbps 4Mbps

我的外網
我的小米路由器外網頻寬狀態
86Mbps 52Mbps

iPhone6s測速
我自己在家中用iphone6s測試50cm距離。我使用Wi-Fi雙頻合一，所以只有1個SSID名稱。用iphone無線連線，幾乎就有外網百分之百的速度。
5Ghz 84Mbps 41Mbps

iPhone6s下載影片

用iphone6s便用video lte從youtube下載370MB電影，每秒10MB/s，100%乎合測速。

已連接的裝置清單：
裝置名稱	IP位址	MAC位址
X200-4G	192.168.31.101	00:21:6A:9C:15:CA
Ricky iphone	192.168.31.223	BC:4C:C4:DF:58:CB
Ricky-HP	192.168.31.104	A0:B3:CC:E4:FA:9D
Ricky-PC	192.168.31.102	6C:19:8F:B5:43:63

DDNS

no-ip.com

名稱	協議	外部端口	內部IP位址	內部連接埠
8089	TCP	8089	192.168.31.101	8089
7752	TCP	7752	192.168.31.101	7752
8889	TCP	8889	192.168.31.101	8889
600	TCP	600	192.168.31.101	600
3456	TCP	3456	192.168.31.101	3456
4022	TCP	4022	192.168.31.101	4022
3389	TCP	3389	192.168.31.101	3389
21	TCP和UDP	21	192.168.31.101	21
22	TCP和UDP	22	192.168.31.101	22
20	TCP和UDP	20	192.168.31.101	20

iphone6s本地FTP下載檔案測試

我使用一台IBM X200作為IIS FTP Server，用無線連到Intel WiFi Link 5300 AGN，距離2米，速度不穩，在135Mbps、162Mbps、216 Mbps跳動。在iphone6s使用OPlayer透過ftp連線下載1GB檔案，由於每秒更新一次已下載大小，我使用capture screen方法測速，如下圖速度為271.9-260.7=11.2MB/s

FTP下載測試結果

測試	路由器與X200距離	路由與iPhone6s距離	LAN	WiFi	Curr	Next	Speed
1	router 0m to X200	iphone 1m to router	100Mbps		260.7	271.9	11.2
2	router 0m to X200	iphone 1m to router		300Mbps	299.6	311.4	11.8
3	router 2m to X200	iphone 1m to router	100Mbps		209.3	220.5	11.2
4	router 2m to X200	iphone 1m to router		243Mbps	100.3	102.9	2.6
5	router 0m to X200	iphone 7m to router	100Mbps		100.2	107.3	7.1
6	router 0m to X200	iphone 7m to router		216Mbps	12.3	12.9	0.6

結論

要達到11MB/s，可以使用100MbpsLAN線連接，或者把小米放在ftp server傍並使用802.11n 300Mbps連線。如果必須使用無線連接，若果小米放遠到2米至7米距離的話，便會急降至不堪使用的2.6MB/s及0.6MB/s

小米硬碟速度
根據這個測試，小米路由的USB 2.0接口读写速度测试成绩分别为24MB/s和19MB/s，这个成绩放在高端路由中也算是不错的，只是考虑到这次测试使用的闪存盘在PC的USB 2.0接口上可以跑出接近30MB/s的读写成绩，因此小米路由实际上还不能完全发挥这个闪存盘的读写能力。

小米青春版速度
這裡說青春版也有60Mbps/68Mbps速度，不錯。

小米路由器評測（試玩篇-小米路由器變身Web Server）
http://hk.miui.com/thread-181-1-1.html

2016年8月11日星期四

日元 HKD to JPY 匯率 Exchange Rate 台幣 TWD to HKD

2017-4-22
恆生銀行 Union TWD to HKD
ATM CUP (22APR17) TWD 6,000.00(HKD20FEE) 1,559.99，$1537 by exchangerates.org.uk
ATM CUP (24APR17) TWD 1,000.00(HKD20FEE) 276.66，$257 by exchangerates.org.uk

2016-10-03
HKBEA Master 月結單，可見東亞率=Master x 1.95%
9-14
0.077874 JPY2418 HKD188.3
0.077902 JPY672 HKD52.35
9-18
0.077878 JPY7516 HKD 585.33
9-20
7.907031 USD650 HKD5139.57
2016-09-14 Master Card

JPY

Japanese yen

13.186629

JPY當日MASTER卡率係1/13.186629=0.075834，加上1.95%後便是0.077313
USD當日MASTER卡率係1/0.128936=7.755785，加上1.95%後便是7.907023

CCB VISA 月結單
去VISA網頁，輸入1.95%
The rate shown is effective for transactions submitted to Visa on September 17, 2016, with a bank foreign transaction fee of1.95%. 1 Japanese Yen = 0.077740 Hong Kong Dollar
9-17 0.0779 (incl fees) JPY3907 HKD304.28
明明JPY3907x0.077740=HKD303.73，不知如何計出來的

BCOMM UNION 月結單
去UNIONPAY網頁1 JPY = 0.0765 HKD
9-17 0.0764 JPY4838 HKD369.92
JPY4838x0.0764 =HKD369.62，相当接近

百年找換有限公司
9-17 WE SELL 賣出參考價 0.07620

2016-08-12

未計手續費, usually VISA 1.95%

使用HKD$760時, 差別為百年HKD$2, 銀聯HKD$4, Master/Visa $8+$15(1.95%)=$23

	每百銀行賣出	每HKD$760 俾多	每HKD$7600 手續費	每HKD$7600 俾多
Google	7.60	0	0	0
百年	7.62	2	0	16
上海商業	7.64	4	0	36
銀聯	7.64	4	0	38
創興	7.65	4	0	44
大眾	7.65	4	0	44
華僑永亨	7.65	5	0	48
東亞	7.66	5	0	53
中銀	7.66	5	0	54
永隆	7.66	6	0	58
恒生	7.68	8	0	82
匯豐	7.71	10	0	105
萬事達卡	7.67	7	148	214
Visa	7.68	8	148	224

Reference:

日圓兌港元 (JPY vs HKD)



1/x 差價

查閱兌換手續費

100日圓兌港元

更新

銀行	電匯銀行買入	電匯銀行賣出	現鈔銀行買入	現鈔銀行賣出 ▲
至高	-	-	7.64000	7.61000
永恆	-	-	7.56000	7.61000
發達鳥	-	-	7.57300	7.61500
百年	-	7.61300	7.57300	7.61800
堅成	-	-	7.57000	7.62000
宇宙行	-	-	7.56000	7.63000
上海商業	7.57200	7.62150	7.55600	7.63800
銀聯	-	-	-	7.64000
創興	7.58700	7.61600	7.58600	7.64600
大眾	7.58920	7.61320	7.57620	7.64620
華僑永亨	7.59000	7.61500	7.58000	7.65000
牛記	-	-	7.55500	7.65500
東亞	7.58900	7.61500	7.57000	7.65500
中銀	7.58600	7.62400	7.55600	7.65600
永隆	7.59000	7.61200	7.57000	7.66000
萬事達卡	-	-	-	7.66828
Visa	-	-	-	7.67760
恒生	7.56300	7.64500	7.54600	7.68400
啟能	-	-	7.59500	7.68500
福安	-	-	7.65000	7.70000
生生	-	-	7.65000	7.70000
匯豐	7.52500	7.66500	7.48300	7.70700
通濟隆(預訂)	-	-	-	7.93000
中信	7.57500	7.62300	-	-
富邦	7.58030	7.61530	-	-
星展	7.56000	7.64200	-	-
交通	7.58942	7.61745	-	-
建設	7.58300	7.61900	-	-
大新	7.58650	7.62050	-	-
集友	7.58600	7.62400	-	-
工商	7.58569	7.62169	-	-
南洋	7.58600	7.62400	-	-
最新: 2016-08-12 13:19:02 HKT 匯率不包括銀行及服務提供者所收取的手續費資料只供參考用途

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2016年12月27日 星期二

CFA Level 2 2017 Official All Study Sessions and Learning Outcome Statements LOS

Hypothesis Test - Null and Alternative Hypothesis, Significance Level and Confidence Interval, P Value

2016年10月18日 星期二

Java Networking and Java NIO Tutorial and Notes

2016年10月13日 星期四

CPU Marks Windows Experience Index and Sis

2016年8月30日 星期二

小米路由器MINI速度測試 Xiao Mi Router Mini Speed Test 及 小米路由器變身Web Server

2016年8月11日 星期四