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Forum: Applied Statistics

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

  1. Marketing - When to stop measuring

    Hello I am running a marketing campaign with a treatment and a randomly selected control. To measure the success I am observing the number of...

    Started by David Edwards‎, Today 07:41 AM
    • Replies: 1
    • Views: 63
    Today, 10:24 AM Go to last post
  2. Modelling Reflexivity with a Time Series Model

    Hi there, I'm new to this forum so hi to everyone! I would like to find a time series model that is capable of modelling two time series with...

    Started by ReflexiveAlpha‎, 02-05-2016 08:57 AM
    • Replies: 4
    • Views: 161
    02-06-2016, 05:48 PM Go to last post
  3. What method is this?

    This comes from a slide, it is all the information I have. They say they ran this: Traditional Ordinary Least Squares (OLS) methods. Fixed...

    Started by noetsi‎, 02-02-2016 03:31 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 272
    02-04-2016, 04:55 PM Go to last post
  4. Web Traffic AB Testing

    Hi, In practice, I've seen people use Chi-Squared test for determining statistical significance in an AB test for something such as visits to...

    Started by Oberon‎, 02-04-2016 01:45 AM
    • Replies: 0
    • Views: 95
    02-04-2016, 01:45 AM Go to last post
  5. Significance between two means

    I have two means that I have calculated for a before/after study and I need to determine if they are significantly different. The means are both...

    Started by skelley80‎, 02-03-2016 11:54 AM
    • Replies: 2
    • Views: 173
    02-03-2016, 12:28 PM Go to last post
  6. Question ROI Error

    Hi, I am trying to calculate the errors for my ROI figure from targeted marketing campaigns. At the end of a campaign I have the amounts spent by the...

    Started by Snow64‎, 01-21-2016 03:29 PM
    error bound, financial modeling, roi
    • Replies: 2
    • Views: 238
    02-02-2016, 11:03 PM Go to last post
  7. Multinomial logit model and weights

    I'm using multinomial logit model in order to model whether a household owns, has access to a computer or none. Household data is weighted - it has a...

    Started by john_f‎, 01-31-2016 10:43 AM
    household surveys, multinomial logit
    • Replies: 0
    • Views: 157
    01-31-2016, 10:43 AM Go to last post
  8. obtaining nominal or base value?

    Hello, Problem definition: I have set of final values of a variable ranging from 1E-1 to 1E-5. Each final value is a product of the Nominal...

    Started by dhruv2p‎, 01-29-2016 08:04 AM
    • Replies: 0
    • Views: 163
    01-29-2016, 08:04 AM Go to last post
  9. Bootstrapping

    I am working on bootstrapping and had a question. Commonly our data sets are fairly large. We have from thousands to tens of thousands of cases. But...

    Started by noetsi‎, 01-26-2016 05:17 PM
    • Replies: 7
    • Views: 297
    01-27-2016, 10:00 PM Go to last post
  10. Linear slope using time data

    I am working on an applied operation problem: hours operating a machine and duty time hours. The data for these 2 variables are extracted from a...

    Started by Trolle‎, 01-26-2016 02:38 AM
    • Replies: 1
    • Views: 136
    01-27-2016, 05:26 PM Go to last post
  11. Graph w/ Proportions and Effects

    I thought this was a pretty interesting looking graph. This comes from SAS, but I thought anybody may appreciate it. Do we in a category that...

    Started by hlsmith‎, 01-25-2016 09:39 AM
    • Replies: 1
    • Views: 119
    01-25-2016, 04:22 PM Go to last post
  12. Outlier Analysis

    Since I circled back to this topic I thought I would start a thread on it :) I tend to think of statistics as some form of pure math where things...

    Started by noetsi‎, 01-19-2016 11:08 AM
    • Replies: 14
    • Views: 371
    01-25-2016, 12:54 PM Go to last post
  13. HELP! Probability That Any Book May Be Read

    I have a question and I'm hoping people can impart some wisdom to my dilemma. My dilemma is lack of data to apply to this problem. The question I'm...

    Started by adangerchen‎, 01-23-2016 12:11 AM
    applied statistics, data generation, probability
    • Replies: 2
    • Views: 172
    01-23-2016, 12:23 PM Go to last post
  14. carry trade portfolio

    Hi all Could you please tell me how to construct an equally weighted carry trade portfolio?

    Started by Nour‎, 01-21-2016 12:15 PM
    portfolio
    • Replies: 0
    • Views: 123
    01-21-2016, 12:15 PM Go to last post
  15. Derive component values from a bundle of goods?

    Hi everyone, Hope I picked the right forum for this question. I am wondering if it is possible to derive the value of components that are...

    Started by Londoner‎, 01-19-2016 11:20 PM
    • Replies: 2
    • Views: 182
    01-19-2016, 11:55 PM Go to last post
  16. help with finance problem

    Could anyone help me.. i have a database and need to answer the questions below. Analysis For the observations with fiscal year end...

    Started by ejjk993‎, 01-17-2016 06:57 AM
    • Replies: 1
    • Views: 204
    01-17-2016, 03:16 PM Go to last post
  17. Bayesian forecasting

    I am using the following bayesGARCH (https://cran.r-project.org/web/packages/bayesGARCH/index.html/) package in R. I am interested in forecasting...

    Started by mark.viduka‎, 01-16-2016 02:56 PM
    • Replies: 1
    • Views: 370
    01-16-2016, 04:15 PM Go to last post
  18. Determining significance and power of a test with fixed sample size

    I have a total population of 70K members and I 12K "kits" that I want to send out to a randomly chosen group to test if the cancellation rate is...

    Started by xandalorian‎, 01-13-2016 10:30 AM
    • Replies: 4
    • Views: 260
    01-15-2016, 06:04 PM Go to last post
  19. [Retail] Modelling the Effect of Weather on Key Site Metrics

    I've been given a project at work which is to build a model which is able to predict the effect of weather by location on our key site metrics...

    Started by JGee‎, 01-14-2016 10:18 AM
    • Replies: 0
    • Views: 164
    01-14-2016, 10:18 AM Go to last post
  20. binomial distribution problem, calculating probability from a B(p,q) distribution

    Hello everyone, I have been trying to solve this Beta distribution problem for quite some time without success. I can get as far as getting the 20...

    Started by parsec2011‎, 01-13-2016 05:30 AM
    beta, distribution, probability
    • Replies: 4
    • Views: 234
    01-14-2016, 06:09 AM Go to last post
  21. Joint outliers - what is this really?

    We analyze the impact of cost and duration (time in service) outliers. I tried to improve the analysis two years ago by looking at outliers on both...

    Started by noetsi‎, 11-02-2015 04:09 PM
    3 Pages
    1 2 3
    • Replies: 41
    • Views: 1,672
    01-12-2016, 02:44 PM Go to last post
  22. Principal factor analysis

    Hello everyone: I have a problem I've been trying to solve the whole day without any success and I hope that maybe you experts may help me. ...

    Started by Student90‎, 01-10-2016 08:10 PM
    • Replies: 0
    • Views: 202
    01-10-2016, 08:10 PM Go to last post
  23. First "big data" (not so big) project... lots of missing data!

    Hello! So, as I’ve shared before here in the forum my boss switched me from the project I was working on to my first “big data” problem. I’m adding...

    Started by spunky‎, 01-08-2016 02:01 PM
    • Replies: 10
    • Views: 352
    01-09-2016, 05:52 AM Go to last post
  24. mathematical model to build a ranking/ scoring system

    I want to rank a set of sellers. Each seller is defined by parameters var1,var2,var3,var4...var20. I want to score each of the sellers. Currently...

    Started by vij‎, 01-06-2016 04:36 AM
    applied statistics, machine learning, mathematical statistics, ranking
    • Replies: 0
    • Views: 223
    01-06-2016, 04:36 AM Go to last post
  25. Ratio - division by zero

    I am working with some data and I was hoping to look at the change in one variable as a ratio of the change in another variable (both have been...

    Started by Statistics help‎, 01-04-2016 05:00 PM
    division by zero, ratio
    • Replies: 2
    • Views: 267
    01-04-2016, 07:46 PM Go to last post
  26. Question Bayesian Hierarchical Customer Spend Model

    Hi guys, I am trying to set up a Bayesian Hierarchical model for customer spending, and was hoping to clarify a couple of things. I want to look at...

    Started by Snow64‎, 12-30-2015 06:17 PM
    bayesian inference, customer analytics, data analytics, financial modeling, hierarchical model
    • Replies: 2
    • Views: 508
    12-30-2015, 11:23 PM Go to last post
  27. Red face Setting Statistically Significant Improvement Goals

    Hi: I work in clinical informatics for very large academic hospital. Currently we are attempting to set 2016 goals for our patient satisfaction...

    Started by Lindseylr‎, 12-15-2015 03:05 PM
    • Replies: 2
    • Views: 276
    12-29-2015, 10:16 PM Go to last post
  28. Can we use bar chart to represent averages?

    Hi to all, I would like to know if the heights of the bars of a bar chart can represent averages, or if they can just represent frequencies. I have...

    Started by Eometh‎, 12-18-2015 08:05 AM
    • Replies: 2
    • Views: 481
    12-18-2015, 11:54 PM Go to last post
  29. Seasonal SARIMA forecasting time series

    Hello, This is a forecasting problem for an SARIMA model in time series analysis. I'll be very appreciated if you help me..Thanks.

    Started by mehmatw‎, 12-16-2015 06:35 PM
    • Replies: 0
    • Views: 249
    12-16-2015, 06:35 PM Go to last post
  30. Exclamation ARMA(1,1) forecasting time series

    Hello, This is a forecasting problem for an ARMA(1,1) model in time series analysis. I'll be very appreciated if you help me..Thanks.

    Started by mehmatw‎, 12-16-2015 06:34 PM
    • Replies: 0
    • Views: 172
    12-16-2015, 06:34 PM Go to last post
  31. Process hypothesis testing - difference between means with known method variance

    Dear experts, I have a measurement method. To evaluate the method I have used it to take 24 parallell samples from a production process and repeated...

    Started by dboy‎, 12-09-2015 07:34 AM
    • Replies: 0
    • Views: 364
    12-09-2015, 07:34 AM Go to last post
  32. Is it possible to measure population targets using random sampling & likert surveys?

    Hi! I am not an expert and I thought I would ask this question here and request some help - anything would help! I have a target to reach 100 ...

    Started by Rabihy‎, 12-08-2015 10:40 AM
    • Replies: 0
    • Views: 201
    12-08-2015, 10:40 AM Go to last post
  33. Unhappy chi square test for various probability distribution

    i want to find out the goodness of fit statistics and p value of various probability distribution by using chi square test. distributions are: 1....

    Started by alam06es‎, 12-08-2015 02:00 AM
    • Replies: 0
    • Views: 193
    12-08-2015, 02:00 AM Go to last post
  34. Automatic determination of pump operation mode

    Hi everybody, I have a data set with pump speed data measured every hour for the period of several months. I have attached the file with the pump...

    Started by AlexeyY‎, 12-07-2015 12:14 AM
    • Replies: 0
    • Views: 248
    12-07-2015, 12:14 AM Go to last post
  35. Inflation Targeting Excel

    Hi, For a economical class I'm following I need some help for an assignment. I'm totally lost. The assignment asks me to test if there is a...

    Started by diederikvanduuren‎, 11-25-2015 11:10 AM
    • Replies: 4
    • Views: 580
    12-06-2015, 05:24 AM Go to last post
  36. Need Help with Correlation

    Hi, I am trying to figure out the best way to calculate correlation with data I have for my business. Here is an example of what I the fields: ...

    Started by ericsd‎, 12-05-2015 01:29 PM
    correlated data, correlation, correlation analysis
    • Replies: 2
    • Views: 274
    12-05-2015, 04:05 PM Go to last post
  37. Creating an index - dependent variable, weighting, research question

    Caveat: I'm basically teaching myself statistics to complete a dissertation so forgive ignorance and bumbling through this, I promise I'm googling...

    Started by Jericho‎, 12-03-2015 10:54 AM
    • Replies: 0
    • Views: 268
    12-03-2015, 10:54 AM Go to last post
  38. Two many outliers for Tukey boxplot?

    I calculated Tukey extreme outliers (in this case only for outliers at the top of the distribution). The calculation is upper quartile +(3*IQR). I...

    Started by noetsi‎, 11-10-2015 12:13 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 904
    11-19-2015, 05:22 PM Go to last post
  39. Moment generating function

    Please ignore, all sorted now

    Started by calypso‎, 11-17-2015 02:33 PM
    • Replies: 0
    • Views: 270
    11-17-2015, 02:33 PM Go to last post
  40. Comparing data sets with two very different samples sizes - stats newbie

    Hi, I realize this question might have been asked before, or is very rudimentary, but I'm having trouble figuring it out. I have several data sets...

    Started by JoeJackson‎, 11-17-2015 01:26 PM
    basic statistics, chi square, sample size disparity, welsch test
    • Replies: 0
    • Views: 246
    11-17-2015, 01:26 PM Go to last post
  41. Which Test to Prove/Disprove hypothesis...

    Hi, I'm new to this forum and I'm not entirely sure if this is the right subtopic to post my question on but I'm hoping someone can give me some...

    Started by feliciak‎, 11-13-2015 10:58 PM
    • Replies: 2
    • Views: 524
    11-14-2015, 08:28 PM Go to last post
  42. Demographic data and MANOVA

    I have a set of demographic data including countries categorised into 6 geographical regions and I want to see how these regions differ depending on...

    Started by o2222p‎, 11-13-2015 11:09 AM
    demographic, discriminant function, manova
    • Replies: 0
    • Views: 216
    11-13-2015, 11:09 AM Go to last post
  43. How to calculate?

    Hello, I would like to ask if anybody know how to calculate break even point of number of loans in peer to peer lending? How much (number of...

    Started by rogamen‎, 11-11-2015 07:06 AM
    diversfication, loan, loans, risk, spread
    • Replies: 0
    • Views: 288
    11-11-2015, 07:06 AM Go to last post
  44. Smile Proper statistical analysis for similarity of two paired datasets.

    Hi! I am an engineering student and as part of an undergraduate research, I created a device that measures a certain value. However, there is a...

    Started by renzbagaporo‎, 11-09-2015 05:53 PM
    • Replies: 2
    • Views: 324
    11-10-2015, 07:52 AM Go to last post
  45. Evaluation of a Factor developing within a population over time

    Hi, For an employee survey, we would like to have a monthly indicator on how several factors ( for example work related stress ) are developing. ...

    Started by Panda666‎, 11-06-2015 08:16 AM
    • Replies: 0
    • Views: 198
    11-06-2015, 08:16 AM Go to last post
  46. Unhappy vargha and Daleney A test ( to measure significance and direction)

    Hello As part of survey data. i conducting Mann whitney U test on ordinal data to identify the difference in ranking of dependent variable by...

    Started by salmasaima‎, 11-06-2015 03:27 AM
    applied statistics
    • Replies: 0
    • Views: 226
    11-06-2015, 03:27 AM Go to last post
  47. correct way to find error/uncertainty

    I have a set of 10 values of a physical quantity P which is defined as P=\sqrt{q^2+u^2} where q and u are themselves two different physical...

    Started by smp‎, 11-02-2015 04:53 AM
    • Replies: 0
    • Views: 263
    11-02-2015, 04:53 AM Go to last post
  48. Comparing which work units are more successful than others

    I have been given a project to determine which work units are more successful than others. My dependent variables are closing cases successfully, and...

    Started by noetsi‎, 10-29-2015 12:19 PM
    • Replies: 5
    • Views: 428
    10-30-2015, 05:11 PM Go to last post
  49. Time series and forecasting

    Which for me are the same thing. I have lots of questions, but at heart the most important. If you are running regression and both the DV and IV...

    Started by noetsi‎, 10-26-2015 01:31 PM
    • Replies: 3
    • Views: 520
    10-27-2015, 11:45 AM Go to last post
  50. Question Re-creating ranking table to allow scenario analysis

    Hi all, At work I have been asked to re-create a league table comparing employers, and build in the underlying scoring system so that we can...

    Started by Scoobing‎, 10-23-2015 04:19 AM
    • Replies: 0
    • Views: 387
    10-23-2015, 04:19 AM Go to last post
  51. Random variates and expected value

    Hi all. I have a spreadsheet with standard normally distributed random variates in one column. How do I find the expected value and variance based...

    Started by PERAV‎, 10-21-2015 05:33 AM
    • Replies: 2
    • Views: 350
    10-21-2015, 11:24 AM Go to last post
  52. Control Charts Help

    Hello All, I am newbie to control charts and wanted to get some clarification on building a control chart. I work in an IT Support team, and we...

    Started by Luffy128‎, 10-14-2015 01:34 PM
    • Replies: 3
    • Views: 474
    10-14-2015, 04:56 PM Go to last post
  53. NFL Week 6 regression predictions

    http://trevorbischoff.com/nfl-2015-week-6-predictions/ Atlanta 54% NY Jets 79% Pittsburgh 52% Minnesota 73% Buffalo 55% Detroit 84% Denver...

    Started by LeeBalto‎, 10-13-2015 08:28 AM
    logistic regression, prediction, regression
    • Replies: 0
    • Views: 371
    10-13-2015, 08:28 AM Go to last post
  54. Average spending per person.

    This should be simple, but its not. I have to know how many people we can release in a future year. To do that I need to know how much on average...

    Started by noetsi‎, 10-09-2015 01:51 PM
    • Replies: 3
    • Views: 425
    10-09-2015, 02:58 PM Go to last post
  55. Question Variance of mean with correlation between auto-correlated time series

    I have several time series of daily temperature measurements for the same period but different places. (More concrete, 9 places with data for 92 days...

    Started by nabla‎, 09-09-2015 06:39 AM
    • Replies: 1
    • Views: 556
    10-03-2015, 07:10 AM Go to last post
  56. statistics for number of cells per image

    greetings, I am trying to compare number of cells per image frame in a treated group and an untreated group. I created photo montages based on...

    Started by Nuland‎, 09-23-2015 05:14 PM
    • Replies: 1
    • Views: 417
    10-03-2015, 05:21 AM Go to last post
  57. 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...

    Started by noetsi‎, 03-12-2015 02:40 PM
    8 Pages
    1 2 3 ... 8
    • Replies: 114
    • Views: 6,253
    09-30-2015, 02:09 PM Go to last post
  58. Data Driven Logistic Regression

    Hi everyone, I just wanted to share a real life usage of logistic regression that I like to monitor as data feeds into it. Plus he is comparing it...

    Started by LeeBalto‎, 09-22-2015 12:24 PM
    logistic regression
    • Replies: 4
    • Views: 496
    09-29-2015, 08:58 AM Go to last post
  59. MA() part of ARIMA: How do you get error terms?

    I've been through the excellent forecasting book coauthored by Hyndman on otext.org. I'm having trouble understanding the actual algorithm. The MA(x)...

    Started by jamesdvance‎, 09-21-2015 01:49 PM
    arima, forecasting
    • Replies: 7
    • Views: 730
    09-25-2015, 02:31 PM Go to last post
  60. Which control chart to use

    I am tracking spending by month going back about 5 years. It is obvious that the pattern changed dramatically in May 2015 and continued for at least...

    Started by noetsi‎, 09-24-2015 01:25 PM
    • Replies: 4
    • Views: 374
    09-24-2015, 02:34 PM Go to last post

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