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# Forum: Applied Statistics

Statistics in finance, economics, engineering. Actuarial science. Econometrics. Operations research.

1. ### Sample size determination for estimating a distribution

I am building an installation that measures the Current in a system resulting from two moving objects passing eachother. I want to conduct an...

• Replies: 1
• Views: 67
Yesterday, 10:21 AM
2. ### Time series

I return to my annual effort to learn time series :p There are regression models designed to deal with autocorrelation in time series data....

• Replies: 1
• Views: 100
07-01-2015, 08:16 AM
3. ### Multilevel modeling - dependent variable is not normally distributed

Hello everybody, I am doing the research, using Multilevel linear modeling (MLM), with dependent variable number of days of payment delays, which...

• Replies: 10
• Views: 281
06-30-2015, 03:28 PM
4. ### Error band for calibration correction of an instrument

I apologize if this is the wrong area to post this. It seems like it could fall into a couple different areas. I have a question about calculating...

• Replies: 0
• Views: 65
06-30-2015, 12:01 AM
5. ### Factors A and B creating factor C, how to analyze for response R?

Let's say I have a process in which I can change factors A and B. Testing the widgets that are made by the process results in test data C for each...

• Replies: 3
• Views: 141
06-29-2015, 09:25 PM
6. ### missing data/multiple imputations

They often talk about whether the mechanism that generates missing data is"ignorable." I don't really know what this means in practice. Also how do...

• Replies: 56
• Views: 1,934
06-29-2015, 06:55 PM
7. ### How to WEIGHT the adjusted Fisher–Pearson standardized moment coefficient (skewness).

Hello, I'm using the adjusted Fisher–Pearson standardized moment coefficient formula to calculate the skew of some sample data (it's the same...

• Replies: 2
• Views: 299
06-29-2015, 03:11 PM
8. ### An average of standard deviations?

Hello, My apologies if this isn't the correct forum for this, but I'm trying to analyze some data and can't figure out how to obtain an accurate...

• Replies: 25
• Views: 109,337
06-29-2015, 11:58 AM
9. ### Variance ratio and Hurst exponent tests

Hi, I have used the Chow Denning test and the Hurst exponent (Peng, Whittle and R/S methods) to examine if a particular time series follows a random...

• Replies: 0
• Views: 67
06-28-2015, 03:23 AM
10. ### significant change in binomial data?

I want to determine how much of a change in pass rates do I need to observe for it to be statistically significant. For example: pretend there are...

• Replies: 1
• Views: 130
06-27-2015, 02:28 AM
11. ### Test Statistic for Comparing Two Groups of Discrete Data on a Per Unit Basis

I work in a small MEMS fab. I have a spin coating process where polymer is dispensed, spun and cured on individual wafers. Following the cure I use a...

• Replies: 0
• Views: 88
06-25-2015, 06:16 PM
12. ### What is the best software for SEM

In my program it was felt to be Mplus and then EQS. But I am relearning SEM and would like to know which is the best software to relearn with it.

• Replies: 3
• Views: 204
06-25-2015, 05:37 PM
13. ### Recalculation of Control Limits & Cpk target when using 3 Sigma

Hi All I Just want to ask some help regarding Recalculation of Control limits & target cpk when our company is using 3 sigma. I am working in a...

• Replies: 4
• Views: 115
06-25-2015, 09:36 AM
14. ### Time Series with Multiple Intervention Dates

I'm working with a time series in which the same intervention was applied to a large number of items but at different points. Essentially, I have...

• Replies: 0
• Views: 63
06-25-2015, 08:57 AM
15. ### item parceling in SEM?

what advantage can one get from item parceling in SEM? it is really controversial in the publications. How do I know if I need it and how do I...

• Replies: 0
• Views: 132
06-22-2015, 03:02 PM
16. ### Descriptive statistics on dummy variables in financial time series

I got daily returns for the last 15 years. I would like to find the the descriptive statistics(mean,Stdev,skewness, kurtosis) impact on last Thursday...

• Replies: 3
• Views: 154
06-11-2015, 11:16 AM
17. ### Data set where the result for an observation depends on another observation

Hello, and thanks in advance for your help, I am an economics major and trying to learn some stats on my own. I am forming a data set for sports...

• Replies: 3
• Views: 231
06-10-2015, 03:52 AM
18. ### How to calculate Standard Error for unequal sample sizes

Gurus, can you help please? I've been given a set of samples, each has different sample size and mean (but not individual observations). I'm...

• Replies: 1
• Views: 122
06-09-2015, 09:59 AM
19. ### Arriving at sample size the correct way.

Dear members, I have a large group of our customers who have transacted with us once. I would like pick up a sample group of customers from...

• Replies: 3
• Views: 292
06-08-2015, 02:20 AM
20. ### Variance - fleeting thought

As I broaden my stats knowledge I better learn components of different approaches but also see similarities. I notice tonight that in multilevel...

• Replies: 0
• Views: 173
06-06-2015, 10:35 PM
21. ### small sample size

hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

• Replies: 11
• Views: 489
05-28-2015, 05:21 PM
22. ### Likert scale analysis

• Replies: 0
• Views: 139
05-28-2015, 01:32 PM
23. ### Survival Analysis Help

Hi , This is the problem i am trying to solve for a client , and would appreciate some help : 1) I am trying to predict the "time to default"...

• Replies: 2
• Views: 267
05-26-2015, 01:11 PM
24. ### Creating a Segmentation Model

Hello, I'm not sure if this is the right forum to post my question. I'm very new to Data Science and R (my background is actually in Finance); I...

• Replies: 1
• Views: 245
05-21-2015, 06:33 PM
25. ### What does a "finite sample" mean in practice.

This is simply an example of the issue I am addressing; In practice when is the sample large enough that asymptotic properties apply (that...

• Replies: 2
• Views: 189
05-18-2015, 12:48 PM
26. ### Best Practice Time Series Analysis

Hello, I have got a general question. Should trend models like y(t)= b(0)+ b(1)*t y(t)= b(0)+ b(1)*t+ b(2)* t^2 y(t)= b(0)* exp in case...

• Replies: 24
• Views: 1,376
05-18-2015, 11:16 AM
27. ### Generate weighted multidimensional index with Likert-data

Dear all, I am a bit desperate and hope you can help me with my issue. I'm analyzing the economic attractiveness of several countries. To do so,...

• Replies: 0
• Views: 166
05-15-2015, 04:01 AM
28. ### Multiple Linear Regression

Hello, Im trying to forecast an economic predictor and our professor hasn't been very clear as to what to do for this project. I know I am...

• Replies: 0
• Views: 212
05-09-2015, 07:03 PM
29. ### Experimental statistics. t-test and normality.

Hi, i'm currently writhing my bachelor thesis, where i have run an experiment on 31 of my fellow students. Each participant have walked on a...

• Replies: 0
• Views: 239
05-07-2015, 02:16 AM
30. ### Time series Analysis : Vector autoregression in R

I am finding relation between two time series M & M1. M and M1 both found to be stationary at first difference and also cointegrated at first...

• Replies: 0
• Views: 247
05-04-2015, 12:06 AM
31. ### Lag polynomial with argument in time series

I'm following http://faculty.chicagobooth.edu/john.cochrane/research/papers/time_series_book.pdf to ramp up on time series (my background is Elec...

• Replies: 1
• Views: 205
05-03-2015, 08:57 PM
32. ### Vector model for unfolding

Hi, I am trying to understand this multivariate statistical techniques (dimension reduction) which is similar to PCA. It consists of calculating...

• Replies: 0
• Views: 169
04-30-2015, 07:31 AM
33. ### Time series Analysis

I have 4 time series.One of them is stationary and rest of them are not.I need to find relation between them.I will use AIC to decide lag...

• Replies: 0
• Views: 160
04-29-2015, 07:53 AM
34. ### Bootstrapping question

I am brand new to this method and I had a question. I did a 1000 replications of a data base and then ran regression on these. The average value for...

• Replies: 10
• Views: 315
04-27-2015, 03:00 PM
35. ### Modeling parking meter usage with data from just smartphone payments

How could a municipality extrapolate usage data from the revenues from smartphone users (56% in DC per http://goo.gl/WpGyuc) to accurately model...

• Replies: 1
• Views: 237
04-24-2015, 05:26 AM
36. ### Process capability - Negative Binomial

Dear All, I have attribute that show overdispersion and seem to be distributed according to a negative binomial distribution. I have the...

• Replies: 1
• Views: 188
04-24-2015, 05:21 AM
37. ### Audit Sample Size

Attempting to complete an audit of personnel files. The total population is 393. Each personnel file should have 4 documents. A missing document...

• Replies: 0
• Views: 197
04-23-2015, 03:29 PM
38. ### Grouping data segments and applying % modifiers to maximise output

I'm trying to determine the best way to approach an optimization problem, but have been struggling to determine what statistical methods are...

• Replies: 0
• Views: 192
04-22-2015, 05:00 AM
39. ### Urgent help needed: can I take mean of correlation coeficients?

Historic market (Cash) prices and future contract prices are available for last 4 years. I have found correlation between Jan'11 market price with...

• Replies: 1
• Views: 159
04-22-2015, 02:23 AM
40. ### Standard deviatiom of percentage changes

Hi all, I need to calculate de standard deviation of a percentage changes time series. This time series shows the changes in sales versus the same...

• Replies: 0
• Views: 244
04-16-2015, 09:20 AM
41. ### Help with Sequential Sampling where H0 is that both samples are same distribution

Hi, I wonder if anyone could advise? My aim is to compare the results of two randomized algorithms to prove that one does better than the other....

• Replies: 0
• Views: 175
04-16-2015, 06:19 AM
42. ### Methods section- can I use the term inferential statistics if I dont have a sample

I am writing a report and need to write a very brief method section. I basically describe my sample (frequencies), some cross tabulations, and see...

• Replies: 15
• Views: 918
04-14-2015, 04:10 PM
43. ### What does p really mean.

In trying to help another poster I realized that I did not understand this for sure myself. I suspect that, like me, many analyst analyze samples...

• Replies: 7
• Views: 360
04-14-2015, 03:23 PM
44. ### comparing the performance of 2 securities

Hi, To have a measure of the performance of a security I want to use the Jensen's Alpha (from the CAPM). I was just thinking, if I want to...

• Replies: 0
• Views: 180
04-14-2015, 10:00 AM
45. ### How should I forecast given the data?

Hello all, First let me say I am not sure if this is the right section of the forum. Below you will find the data I am working with in graphical...

• Replies: 5
• Views: 507
04-08-2015, 02:48 PM
46. ### Logit v. Probit: A fight to the death

Every now and then I have to work with binary responses with continuous covariates. So of course this screams generalized linear model. The...

• Replies: 67
• Views: 20,259
04-08-2015, 12:47 PM
47. ### How to speed up your computations in R: a ts inspired paper.

Hi everyone, quark requested that we highlight this paper on TS. Many of you are already aware of this paper. The article is open access, and...

• Replies: 1
• Views: 247
04-06-2015, 07:29 AM
48. ### Control Variables

Hello everyone, New member here. Im currently writing an econometrics paper for my honours thesis. My topic is along the lines of corporate social...

• Replies: 2
• Views: 311
04-05-2015, 09:27 AM
49. ### individual-level random effects and the idiosyncratic error

Can anyone explain how some of the explanatory variables could be correlated with individual-level random effects, but that none of the explanatory...

• Replies: 0
• Views: 227
04-03-2015, 07:11 PM
50. ### How to set up manova in MATLAB for multifactor analysis

I have 4 independent variables: Frequency (within-subjects, continuous, 16 levels) Amplitude (within-subjects, continuous, 3 levels) Time...

• Replies: 0
• Views: 213
04-02-2015, 07:31 PM
51. ### SEM and normality

Been a while since I worked with SEM. This puzzled me as I thought multivariate normality, the normality of the residuals was what mattered in...

• Replies: 13
• Views: 565
03-31-2015, 08:11 AM

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