r***r
发帖数: 123 | 1 BlackKnife,
Thanks for your expertise.
I know very little about statistics. Don't even know what is gamma distribution
. Would you please give me some formula or agrithom to calculate gamma
inverse. I couldn't find any.
We currently use Excel/SAS to get around of this. My boss want do it in the
Oracle.
Thanks once again!
自己
其他
新月 |
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s***e
发帖数: 830 | 2 不做统计，主要是calculate numberical solution of a non-linear function, or
maximize a complicated function. |
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d******1
发帖数: 4 | 3 I get this because trying to get lnt[0, infinity] (sinx/x) dx,
any easy way to calculate lnt[0, infinity] (sinx/x) dx? |
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l********p
发帖数: 1234 | 4 想买TI-84 graphing calculator , 发现都在1００多 dollars， 那里有deal for
cheap one?
thank you everyone for this advice. |
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s*i
发帖数: 5025 | 5 Calculate the Biot Number for each bi-layer:
Bi = alpha*(V/A)/lamda, where alpha is heat transfer coefficient, V is volume,
A is area, and lamda is thermal conductivity.
I believe the number will be <0.1, which means one dimensional solution should
be fairly good. |
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x**l
发帖数: 1 | 6 I am looking for tutorials for beginners on bearing calculation (to find the
right bearing). Anyone can provide some reference?
Many thanks |
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o*********e
发帖数: 9 | 7 Is there anyone who knows where to find the standard DIN 45631, which is for
calculating loudness of sounds?
Thanks. |
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s******n
发帖数: 65 | 8 Begin to do NBME. How to calculate score? 80% correction rate=230? or less
than 30=230?
Thanks |
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g****i
发帖数: 2269 | 9 I was told that even in CA, new grad are paid as 25/hour, not high as 30. Ned
somebody in CA to clarify
For example: all numbers are before tax
base=25/h
shift differential: 3.5/h from 3pm to 11pm; 4/h from 11pm to 7am
weekend differential: 3/h which is added to your base anytime in weekend
holiday differential: no idea yet
overtime: 1.5 * base + all kinds of differential
calculation: if you work 12 hour shift, 3 days a week
from 7am to 3pm: 25*8=200
from 3pm to 7pm: (25+3.5)*4=114
So you will e |
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n*********e
发帖数: 149 | 10 thanks first
my sample is 3*7 mm^2
and the detector area is 10*10mm^2
the distance between sample and detector is 2mm
how can I calculate the solid angle the detector coverd, any formular?
does it depend on the sample size or I can use a point for the sample?
try to google to find answers, more and more confused...
thanks again |
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h***o
发帖数: 350 | 11 How do we calculate the dielectric constant e' and e", and refractive index
n from transmittance and reflectance data? Is there any software that we can
use?
Thanks a lot for help! |
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c**********e
发帖数: 2007 | 12 Does anybody know how to calculate Real Yield to Maturity for a Treasury
Inflation Protected Bond?
It is a surprise that it is hard to find the formula. |
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f********c
发帖数: 21 | 13 My guess is that you can't calculate the YTM, because you don't know what
future inflation is going to be, and therefore do not know what your future
coupons are. |
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b***k
发帖数: 2673 | 14 ☆─────────────────────────────────────☆
xiaoxiaokuan (小小矿) 于 (Thu Mar 6 12:49:33 2008) 提到:
sum of n^2*(1/2)^n, n=1 to infinity
thanks
☆─────────────────────────────────────☆
dArtagnan (达达尼昂) 于 (Thu Mar 6 12:57:43 2008) 提到:
let the sum be S
R = S - 1/2 S = 1*(1/2) + \sum [(n+1)^2 - n^2]*(1/2)^(n+1)]
= 1*(1/2) + \sum (2n+1) (1/2)^(n+1)
and then calculate
R - 1/2 R
☆─────────────────────────────────────☆
xiaoxiaokuan (小小矿) 于 (Thu Mar 6 12:59:09 2008) 提到:
wow, thanks!
☆─────────── |
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m****d
发帖数: 331 | 15 【 以下文字转载自 Statistics 讨论区 】
发信人: madrid (马甲), 信区: Statistics
标 题: Can we calculate log likelihood ratio using SAS???
发信站: BBS 未名空间站 (Fri May 30 14:07:01 2008)
My model is a constrained regression ( a linear regression model with
inequality constraints)...Thank you. |
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d**s
发帖数: 920 | 16 Hi, All:
This is a general math (statistical) problem.
If I believe Apple's stock(AAPL) is correlated to stock price of Research in
Motion(RIMM), and is also correlated to the movement of Nasdaq(QQQQ), that
is, I think the price change of AAPL can be formulated as:
AAPL% = a*RIMM% + b*QQQQ%
where:
AAPL% is the price change of AAPL,
RIMM% is the price change of RIMM,
QQQQ% is the price change of QQQQ,
a and b are two coefficients.
My question is that, how can we calculate these two coefficients a |
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a***d
发帖数: 73 | 17 Anyone knows how to calculate the risk of straddle? |
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p********0
发帖数: 186 | 18 Hi,
According to WIKIPEDIA, http://en.wikipedia.org/wiki/Leverage_(finance)
A company's leverage can be calculated using DebtToEquity ratio,
IntesterstCovergae.
A higher DebtToEquityRatio means the companies is higher levered up, it
borrowed money to invest, so it is more risky for the company, but
potentially more returns.
On the contrary, the higher InterestCovergae means the company can pay its
debt/interest without probleam, mean the company in good shape, so the
company is less leveraged.
S |
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w*******d
发帖数: 8 | 19 VWAP Calculation is not a trivial procedure.
You have to pay attention to the sale condition code of trades.
And there is no industry standard. |
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k**8
发帖数: 14 | 20 Which risk free interest rate is used for calculating implied volatility?
Appreciate your help! |
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k**8
发帖数: 14 | 21
Thank you, NYUTT. Can you explain more about how to use libor for implied
volatility calculation? My confusion is that libor rates are not continuous-
compound rates. How can I plug libor into black scholes? Do I need to
convert them first?
Thanks, again. |
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k**8
发帖数: 14 | 22 If I have the implied volatility and I want to calculate the price, which
rate should I use for the funding cost?
Thanks! |
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T*********e
发帖数: 363 | 23 本来是发到二手版的，后来觉得想买的可能都在这个版上，不知道违规不，斑竹手下留
情。
我想卖的物品:
2个全新封装 TI BAII financial calculator
可接受价格(必须明码标价！):
$28
物品新旧要求:
brand new
邮寄方式要求:
FCDC，free shipping
买卖双方谁承担邮寄损失(Required if not code only):
before you after me
付款方式说明:
Paypal or BOA
其他补充说明:
全新，给朋友代买结果人家不考CFA了。不讲价
广告的有效期:
until gone
物品来源(Required for All Cards!):
From staples
我的联系方式:
站内信箱
Warranty期限: |
|
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T*********e
发帖数: 363 | 25
Calculator/dp/B00000JZKB/
呵呵，amazon是24.99，结账的时候你就会发现25才free shipping，然后你必须买一个
一分钱的
东西，可是amazon上到哪去找一分钱的东西呢。。。 |
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a****o
发帖数: 686 | 26 say, underlying asset is SPX index, settled in JPY,
e.g. a call option on SPX index, with strike = 5000 in USD, say, at maturity
, spot = $6000, then the contract will payoff 1000 in JPY.
it is a classic FX quanto option.
how to calculates the greeks?
experienced ppl please.
thanks a lot. |
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m******t
发帖数: 273 | 27 I need to calculate an integral in python.
I have imported sympy.
g(a,z) = integral_from_z_to_inf of ( t^(a-1) * e^(-1))
in python:
x,a,z = symbols('x a z')
g = integrate(x**(a-1) * exp(-x), z, oo)
I got error:
ValueError: Invalid limits given: (z, oo)
Any help would be appreciated !
Thanks ! |
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o******6
发帖数: 538 | 28 ☆─────────────────────────────────────☆
lihao (思君) 于 (Wed Feb 13 10:12:51 2008) 提到:
data aa;
input id var1 var2;
cards;
001 1 1
002 1 2
003 3 4
;
I want to calculate the var1 sum of all 3 cases.
please help! thanks!
☆─────────────────────────────────────☆
lihao (思君) 于 (Wed Feb 13 10:22:40 2008) 提到:
☆─────────────────────────────────────☆
wuhuya (wuhuya) 于 (Wed Feb 13 11:27:47 2008) 提到:
to many ways to do this. just listed two of them
1. proc means data=aa;
var var1;
o |
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s*********e
发帖数: 1051 | 29 copied from my blog.
hth.
%macro roc(data = , score =, y = );
*******************************************;
* THIS MACRO IS TO CALCULATE AUC (AREA *;
* UNDER CURVE) USING TRAPEZOIDAL RULE *;
*-----------------------------------------*;
* INPUT PARAMETERS: *;
* DATA : INPUT DATASET *;
* SCORE: SCORE (HIGHER ==> BETTER) *;
* Y : 0/1 TARGET (1 ==> BAD) *;
*******************************************;
data _tmp1;
set &data;
wh |
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j******n
发帖数: 2206 | 30 I have a dataset include one variable: X
I want a sas code to calculate the following two new variables,see
attachment.
it's maximium likelihood function for lognormal distribution. |
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m******1
发帖数: 19713 | 31 I have a data set like this:
id x
1 0.254
2 0.564
3 0.875
4 0.689
.......
The weight for each observation is x/sum of x's. What is the best way to
calculate it?
Thanks. |
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y*m
发帖数: 102 | 32 not easy, better sort it by desending order, then do it backwards.
after done, sort it back
or from my previous experience, addl can be calculated by expanding all the
dates in a CDP(constant dosing period), of course you 'll have to know the
start date and end date of each CDP. |
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t**i
发帖数: 688 | 33 There may not be a variable indicating this in the data set to begin with.
However, such information has to be obtained/created in the process of
calculating ADDL.
Let's concentrate on the original example dataset for the time being and
complete it.
variable |
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e****t
发帖数: 766 | 34 只是在课上学过简单的计算和定义。
有没有系统的书介绍一下不同distribution endpoint 的sample size 的calculation
主要是用在clinical trial上面。
谢谢了！ |
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x***x
发帖数: 3401 | 35 If the number of time points within each subject doesnt vary too much, why
dont you make a "long" to "short" transformation?
So the short form has the following variables:
NAME T1 RET1 T2 RET2 T3 RET3
then you can calculate the avgs
AVG123 AVG23 AVG3 etc...
ret' |
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b******e
发帖数: 202 | 36 Does anyone know a software or online calculator that computes a multi-rater
Cohen’s kappa with exact p-values? SAS and SPSS have macros which compute
a multi-rater Fleiss’ kappa but I need a Cohen's kappa.Thanks! |
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l********p
发帖数: 1234 | 37 想买TI-84 graphing calculator , 发现都在1００多 dollars， 那里有deal for
cheap one?
thank you everyone for this advice. |
|
s*******d
发帖数: 132 | 38 I have an id variable, and hundreds of covariates var1- var100.
There are some id are the same with each other. For these rows with the same
id, I need to calculate the mean for var1 - var100, respectively.
How to do this in R? Thanks. |
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k*******a
发帖数: 772 | 39 没看懂你的题目
你是要calculate还是estimate?
什么是1 sample 3 test? |
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C*******O
发帖数: 147 | 40 Sorry I am not a statistics person. Let me clarify it. I also revised the original post.
1 Sample means one physical part(let's say a steel bar). 3 tests mean
repeating the test 3 times with the same part. Each time, there are certain
number (n) of data collected.
Calculate or estimate, whichever is doable. |
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k*******a
发帖数: 772 | 41 还是没看懂啊
比如说第一天 测量n1个值（对同一个物理量吗？）
如果那样，岂不是相当于测量了n1+n2+n3次同一个量？
你最后想要的是什么？定义一下什么是overal standard deviation
times, may at different time or days).
deviation=s1;
calculate or estimate (whichever is doable) the overall |
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g*********o
发帖数: 20357 | 42 老板老说要学power calculation，能推荐个网上教材什么的嘛，多谢！ |
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g******n
发帖数: 339 | 43 你这个自我称呼让我回到了遥远而性感的古代。“垆边人似月，皓腕凝霜雪”，哈哈，
想得太多了。
回到这个讨论的问题吧， 一般来说，effect size 指的是diffrence of the means or
proportions。不过在medical jurnal上好像也有人把这个均值的差除以一个standard
deviation,算是一个standardized effect size. If the end point is a
continuous variable, and the comparison is between 2 groups with common
standard deviation assumption, then the standardized effect size, along with
alpha and beta, would be sufficient for a sample size calcultion based on
normal approximation. However, this is not the case for ... 阅读全帖 |
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S********a
发帖数: 359 | 44 请教个sample size calculation for logistic reg的问题，predictor是PM(25%的人
是在exposure下，trial的个数我自己写了个1000）, outcome 是MI(4个人里有一个人
是MI，所以P＝0.25,trial的个数也是自己写的1000),我想看sample size 要多少才可
以significantly odd ratio>1.
proc power;
logistic
vardist("pm")=binomial(0.25, 1000)
vardist("MI")=binomial(0.25, 1000)
testpredictor="MI"
responseprob=0.25
testoddsratio=1
alpha=0.05
power=0.8
ntotal=.;
plot y=power min=0.01 max=0.99 yopts=(ref=0.8 crossref=yes) vary(symbol);
run;
结... 阅读全帖 |
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Y******Y
发帖数: 8753 | 45 看来看去不觉得这个是sample size calculation... |
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t********1
发帖数: 799 | 46 there is a table with different variables as below,
yyyymmm, value1(%), value2(%), value3(%), .......
now I need to calculate every three observations' accummulated percent, i.e.
quarterly accummulated percent for value1,value2, value3,.....
How can I realize this? Thank you very much. |
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e****t
发帖数: 766 | 47 yes, i agree. just when you calculate back from se to sd.
how to decide n1 and n2 ?
if using SE / (sqrpt (1/n1 + 1/n2))
thanks |
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y*****w
发帖数: 1350 | 48 Crossover design.
Subjects were randomized to Treatment A or Treatment B.
Outcome variable: a lab measure (continuous).
2 weeks 2 weeks
Treatment A -----------> lab test ----> Treatment B -----------> lab test
2 weeks 2 weeks
Treatment B -----------> lab test ----> Treatment A -----------> lab test
Since it... 阅读全帖 |
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y*****w
发帖数: 1350 | 49 (1) This is a "crossover ANOVA" which involves the feature of paired t-test.
It is exactly in the process of estimating "standard deviation of
differences" which involves the STDDEV of difference in AB, the STDDEV of
difference in BA, and the between-subject correlation between AB and BA.
(2) On the other hand, when directly applying paired t-test, we would need
to input the STDDEV of A, the STDDEV of B, and the correlation of within-
subject pair of measurements. See the link at
http://support.... 阅读全帖 |
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