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Threads 181 to 240 of 1508

Forum: Applied Statistics

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

1. Comment on forecasting versus causal interpretation

I don't think the mean causality in the classical sense, but simply the slope. I found this comment in an econometric text fascinating and since...

• Replies: 1
• Views: 1,856
06-30-2016, 01:42 PM
2. Overall impact of a categorical variable.

I have a categorical (nominal) variable with 7 levels. I created six dummy variables and can show their slopes in linear regression. But the division...

• Replies: 4
• Views: 1,545
06-25-2016, 04:29 PM
3. Corporate Finance - Growth, ratios log transformations

Hello all, Apologies in advance for the long post, and let me know if im violating any forum rule. I’m trying to expand Erik Stafford’s(2015)...

• Replies: 0
• Views: 777
06-25-2016, 08:45 AM
4. differencing and the definition of the dv

When you difference a series in ARIMA you are changing the definition of the series - something I had not thought of before today. So if for example...

• Replies: 3
• Views: 2,309
Stu
06-23-2016, 02:57 PM
5. order of MA or AR in ARIMA

When you speak of a AR or MA 2 are you saying that yt is being influenced by something that occurred at t-2 (two lags ago) or at t-1 and t-2...

• Replies: 4
• Views: 2,249
06-22-2016, 03:18 PM
6. Choosing lags for ARDL models

ARDL models have lags of Y and predictors. However, there rarely is enough theory to chose the correct number of each. Given that one author...

• Replies: 0
• Views: 3,259
06-21-2016, 03:26 PM
7. Due-To Analysis in a Multiplicative Function

Hi Everybody, I have built a linear regression model to explain sales based on different variables (sales, temperature, etc). The model is a...

• Replies: 0
• Views: 1,401
06-21-2016, 01:39 PM
8. Parameter finding - can you give me a basic guide?

Hey there, I started working with a detector, and I was asked to model the efficiency of this it. I have collected lots of data about the...

• Replies: 2
• Views: 1,428
06-21-2016, 09:30 AM
9. forecasting sales

Suppose I have a car insurance sales data broken down by week. In my case, I have 45 weeks of data. Sales range from 22 to 60 per week. I purposely...

• Replies: 10
• Views: 2,709
06-20-2016, 05:12 PM
10. Trend analysis - problem with differing sets of years for financial date

Hi, I am working with financial data from the American Hospital Association that spans 4 years each for hospitals in the list. I want to do a trend...

• Replies: 2
• Views: 1,287
06-20-2016, 03:03 AM
11. Learning analytics

Hi all. I am a newbie to data analysis. I am an online learning facilitator for an online seminar-based program for local high school students. Since...

• Replies: 2
• Views: 1,344
06-17-2016, 01:43 AM
12. Time series bias

Its noted that autocorrelation does not bias the slopes just effect the results. But spurious regression tied to non-stationarity/trend where the...

• Replies: 2
• Views: 1,329
Stu
06-16-2016, 02:24 PM
13. Design Issue?

I am working with a sample of ~500 people. There are 11 variables of interest. The first 10 (X1-X10) variables are binary and the eleventh (X11) is...

• Replies: 0
• Views: 1,275
06-15-2016, 02:39 PM
14. Types of Non-stationarity

the literature says you need to know the type of non-Stationarity you are dealing with. How do you do this, how do you know if its trend or...

• Replies: 1
• Views: 1,557
06-13-2016, 04:14 PM
15. How do you know when a violation is "mild" as compared to "severe"

I know there is no simple answer to this and its context driven. I ask this because of this specific quote by an author I am reading .

• Replies: 4
• Views: 1,669
06-13-2016, 04:05 PM
16. Chocolate bonbons, sample size and confidence interval

Hello! I work in a factory where chocolate bonbons are produced (my name is not Charlie). The production of these chocolates is automated. Sometimes...

• Replies: 5
• Views: 1,450
06-09-2016, 02:15 PM
17. durbin-watson value

I have a linear regression where I am predicting the length of time someone was in a specific status for customers who were active in April 2016....

• Replies: 0
• Views: 858
06-09-2016, 12:47 PM
18. Kernel Density Outlier Threshold

Hi All, First of all, thanks for showing an interest in this thread, and secondly, if your so kind to give your thoughts, I'd be so grateful. ...

• Replies: 0
• Views: 1,612
06-09-2016, 10:28 AM
19. Multilevel modeling

Hello everybody, I have a question regarding multilevel modeling. I am building a 3-level model: 1st level yearly observations (variables which...

• Replies: 0
• Views: 1,472
06-09-2016, 08:39 AM
20. Modeling time series in medicine, which method to do

Hi all, First of all, I'd like to say that I'm quite basic at statistics, so my apologies if my problem description is initially unclear. I'm...

• Replies: 0
• Views: 2,314
06-08-2016, 09:22 AM
21. Stationarity

I don't get the following. What if none of the predictors are non-stationary? http://www.reed.edu/economics/parker/312/tschapters/S13_Ch_4.pdf

• Replies: 3
• Views: 1,817
06-07-2016, 11:44 AM
22. Perceptual Map using binary outcomes

I have 10 classes of drugs and within each there are a series of characteristics, e.g., color, aroma, strength and then for each the respondent notes...

• Replies: 1
• Views: 1,538
06-03-2016, 03:06 PM
23. Chow test and structural breaks

I read this comment in a discussion of structural breaks. It is difficult me to imagine estimating when a break would occur unless you look at...

• Replies: 4
• Views: 1,000
06-03-2016, 12:51 PM
24. Design of Experiments alternative saught please

Hello there, New to statistics and put into a project requiring an ability I do not have, yet. There are many independent x variables, one...

• Replies: 3
• Views: 1,080
06-03-2016, 11:04 AM
25. Justification for multilevel modeling

I used this last 3 years ago (I had a course in it but never utilized it at work). We have customers nested in units, nested in areas, nested in...

• Replies: 5
• Views: 1,828
06-03-2016, 11:02 AM
26. How to rank test scores when number of questions answered is different

I want to rank people based on their test scores but the number of questions each individual has answered is different. People with "n" answers or...

• Replies: 6
• Views: 1,568
06-03-2016, 05:24 AM
27. Choosing an appropriate model for project in marketing

Hello everyone, I have a question conserning the model in my research and I will be really grateful if someone helps me. (sorry if I make mistakes...

• Replies: 1
• Views: 842
05-31-2016, 02:15 PM
28. Use of lags to deal with autocorrelation

This has confused me since I first worked with time series. One solution to dealing with autocorrelation is to specify a lag of Y (I think it is...

• Replies: 1
• Views: 1,480
05-31-2016, 01:14 PM
29. Lucrative skill sets

According to Money magazine number 1 is a SAS programmer (probably because data mining is so hot and SAS seems to dominate that). Third is a data...

• Replies: 0
• Views: 935
05-31-2016, 08:30 AM
30. Control Chart - Which one to use - IMR or CUSUM

Hi, I have a thesis study about statistical quality control. I have data from a chemical factory manufacturing powder paint. They want to use...

• Replies: 17
• Views: 3,983
05-31-2016, 08:23 AM
31. Understanding scatter plots / residuals

In many case you have to analyze scatter plots or residuals for linearity, heteroskedacity etc. My problem is my data typically has thousands of...

• Replies: 3
• Views: 1,327
05-28-2016, 05:50 PM
32. Workforce Analytics

Hi ..I wanted to know which statistical techniques are used in workforce analytics? Thanks in advance

• Replies: 3
• Views: 1,399
05-27-2016, 06:13 PM
33. examining odds ratios

so I have a large data set with odds ratios for identification for services based on different sub groups. For example, an odds ratio for...

• Replies: 3
• Views: 1,246
05-27-2016, 01:29 PM
34. Pension calculation: can you help deternine if this is methodologically adequate?

Hi, Thanks for taking to the time to check my post. Since this is a longish post, here is my question in a nutshell (read on for context and...

• Replies: 0
• Views: 1,101
05-21-2016, 11:28 AM
35. Control chart for spending over time.

I am running a control chart for spending over time (there are about 80 data points, one per month for the last 80 months). Is there one type of...

• Replies: 54
• Views: 11,789
05-13-2016, 11:12 AM
36. Mills ratio

How the mills ratio is interpreted??

• Replies: 0
• Views: 1,033
05-12-2016, 12:28 PM
37. Chi-Square Triangle Beer Test with weird answers...

I am trying to help develop a test for deciding if two different beer recipes taste statistically different under a blind triangle test. I created an...

• Replies: 11
• Views: 5,208
05-08-2016, 11:08 AM
38. Which model to use? Need help identifying appropriate statistical analysis

Hi All, I need some help in identifying what the best statistical model/approach to take in doing an analysis on sales-out data. I essentially...

• Replies: 0
• Views: 835
05-04-2016, 08:22 AM
39. Casino betting

Hi, I'm playing "even money baccarat" where if player wins it pays one to one, banker win it also pay one to one except when banker wins on a 6...

• Replies: 2
• Views: 2,263
05-02-2016, 07:18 PM
40. Developing expected outcomes - chi squared?

Hi all. I have a question as follows to answer: "The data covers the type of bean mix supplied to external outlets in January and December of...

• Replies: 0
• Views: 2,097
05-02-2016, 05:17 AM
41. Time Series and the CLT

Unfortunately I no longer have the book this is based on. I was wondering why exactly this is the case . Personally I don't think most analyst...

• Replies: 16
• Views: 3,068
05-01-2016, 11:31 AM
42. Weekly Survey Sample impacted by low sample rates

Dear all, I hope you can help as I am at the limit of what I know regarding this! We survey a sample of our customers each week for customer...

• Replies: 0
• Views: 1,312
04-29-2016, 07:13 AM
43. Confidence in data set

Hi I am currently looking at some data and I am trying to draw conclusions from it but I am not confident that conclusions can be drawn due to the...

• Replies: 6
• Views: 1,231
04-29-2016, 06:57 AM
44. Determining the order of AR

When you are doing time series regression determining the correct AR error is important. I was wondering if either or both of these work. Run...

• Replies: 1
• Views: 1,135
04-28-2016, 03:25 AM
45. Fuzzy logic systems and fuzzy rules definition

Hello, I'm new in fuzzy logic modeling. I'm using the package "sets" in R. Starting form a database of crisps variables of 8 input varialbes and 1...

• Replies: 0
• Views: 993
04-27-2016, 08:15 AM
46. Does this mean what I think it means

:shakehead Getting old I have data which shows gains in wages. Say getting OJT shows \$36 and not getting it shows \$27. I have calculated the...

• Replies: 8
• Views: 1,343
04-25-2016, 09:50 AM
47. Help with errors in a research

Hi all, I am new to this forum and I am really glad that I found it. Hope I'll be able to offer some help as well. My problem is fairly simple,...

• Replies: 0
• Views: 1,414
04-25-2016, 05:00 AM
48. Finance Event Study - Event Induced Volatility

Normally, in an stock price event study, we assume that the daily variance in the estimation period is the same as that during the event window. ...

• Replies: 0
• Views: 1,420
ctm
04-20-2016, 06:56 PM
49. Net income variability in relation to profit margin

I've been working with a data set of company financial information over the past decade. I am particularly interested in how and if the profit margin...

• Replies: 0
• Views: 1,001
04-20-2016, 04:14 PM
50. Analysis of nonnormal distributions for mobile gaming.

Hello, all! I'm a newly minted UX Researcher at a mobile gaming company. I say "newly minted" because I've been in academia until very recently....

• Replies: 3
• Views: 1,391
04-19-2016, 03:35 PM
51. Looking for causes of a factor, statistical control

I ran a regression with a series of statistical controls. Say education and time in service are the controls and what I really want to know is...

• Replies: 0
• Views: 1,216
04-19-2016, 08:08 AM
52. To bootstrap or to not bootstrap

I am thinking about whether or not I should derive bootstrap estimates from an analysis I am working on. A bit of background- I am examining...

• Replies: 0
• Views: 1,522
04-17-2016, 08:16 PM
53. American equivalent of Natrional Centre for Research Methods

That is an excellent site, but where I work all foreign sites are blocked and I was hoping to find a US equivalent of it. It does a lot of work on...

• Replies: 0
• Views: 1,172
04-15-2016, 01:01 PM
54. Standard Deviation Help for 5-year Investing term

Hi, I'm trying to build a detailed expectation profile for a compounded five-year investment. It averages a 40% return per year with a 60% standard...

• Replies: 0
• Views: 1,485
04-14-2016, 03:51 AM
55. Physical interpretation of an AR(n) series

Hi, I am learning TS analysis but my angle is probably diffent from the usual. Being in six sigma I need to reduce the variability of a process that...

• Replies: 11
• Views: 1,628
04-13-2016, 07:24 AM

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