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# Forum: Applied Statistics

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

1. ### 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: 26
• Views: 211,783
02-23-2017, 10:18 AM
2. ### what to do after a chi˛ test

hey, i compared the frequency of samples containing zero pupa vs samples containing at least one pupa in different stations. i carried out a chi˛...

• Replies: 3
• Views: 144,844
06-26-2010, 12:49 PM
3. ### Kaplan–Meier - Cancer Survival Rates

Hi, I'm doing a degree project on a comparison of Cancer Survival Rates for two ten year periods for different cancer types and am having great...

• Replies: 2
• Views: 90,249
12-03-2010, 04:17 AM
4. ### Monte Carlo analysis – choosing a distribution

I have several samples from datasets drawn from mixed political and economic data. On a univariate level, much of the data is clearly not normally...

• Replies: 1
• Views: 67,686
12-12-2011, 08:46 PM
5. ### Formula for Cohen's d effect size

Help!! I am struggling to figure out the effect size formula ( the spooled part) to get the effect size calculation. I have two groups (55 and 33)...

• Replies: 12
• Views: 64,559
07-24-2010, 07:13 PM
6. ### 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: 38,685
04-08-2015, 12:47 PM
7. ### Real life examples for the following distributions

Hello everyone, Can anyone please tell me some real life examples, maybe with a bit of explanation for the following distributions: normal,...

• Replies: 3
• Views: 31,756
10-27-2010, 10:12 AM
8. ### How to calculate probability of a failure for Reliability theory (Exponential dist)?

Lets talk Reliability theory, failure rates, MTBF, etc. We are going to assume single-point failure (no redundancy), and the exponential...

• Replies: 2
• Views: 29,865
01-26-2012, 02:23 PM
9. ### Estimating standard deviation from paired data

I work advising chemical analysts as best I can on statistics. There is one issue that I am really struggling with and would really appreciate some...

• Replies: 1
• Views: 24,913
09-08-2010, 10:19 PM
10. ### Sample size for really small populations

Hello, I'm about to do a research. This research involves a very small population (100 approx), but having the whole population for study would be...

• Replies: 6
• Views: 24,373
12-02-2011, 02:18 PM
11. ### roc analysis in spss

Hello, I am analyzing some data from 2 diagnostic tests and I want to do a ROC analysis in SPSS. However I don't have any experience with this, so...

• Replies: 1
• Views: 24,357
08-18-2010, 04:48 PM
12. ### Principal component analysis

I have a problem with the analysis of my dissertation. The topic is constructed wetlands and I have measured a set of variables to categorise these,...

• Replies: 5
• Views: 21,345
02-28-2011, 10:26 AM
13. ### 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: 114
• Views: 17,636
09-30-2015, 01:09 PM
14. ### How to calibrate scores in credit scoring model

Dear all, I have developed score card for a financial institute, the objective was to forecast future performance from past behavior. Credit...

• Replies: 1
• Views: 15,382
09-12-2011, 03:50 PM
15. ### One way ANOVAs or Two way ANOVA?

Hello... I am new here but I am hoping you all can shed some light on a question I have. I am not sure how to best analyze my data... hopefully I...

• Replies: 8
• Views: 14,930
07-08-2010, 10:12 AM
16. ### Before and After Statistical Significance

Hey, I was wondering how to do before and after statistics to show significance in the aftermath of a process. The situation is that we are...

• Replies: 3
• Views: 14,355
06-24-2010, 12:39 PM
17. ### Finding the Z-Score for Safety Stock Calculations

Dear Forum, I want to calculate the safety stocks required by our company to achieve a certain service level for our customers. The basic...

• Replies: 0
• Views: 13,429
03-22-2014, 10:41 AM
18. ### 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: 11,943
05-13-2016, 11:12 AM
19. ### What do statistical tests really do

The background. We generated customer to counselor ratios for our counties (these are population data not a survey. That is we queried all our...

• Replies: 43
• Views: 11,934
04-01-2017, 11:50 PM
20. ### Standard deviation of Standard deviation

I am working on a Monte Carlo code enhancements and for this I need to calculate the standard deviation of my result. However to compare different...

• Replies: 5
• Views: 11,792
09-23-2010, 02:50 PM
21. ### Linearity

A key issue for me is to determine if my data is non-linear and determine ways to make it linear if possible. An approach that looks promising to me...

• Replies: 47
• Views: 11,521
10-05-2014, 09:24 PM
22. ### Best Practices for Handling Skewed Data?

Hi everyone! I'm currently working on cleaning various inputs to perform a multiple linear regression. I have no experience in applied...

• Replies: 3
• Views: 11,501
08-08-2013, 09:23 AM
23. ### reporting of interactions and main effects

Hi I have a general question. When you include interaction terms in a regression model together with main effects and the interaction terms are...

• Replies: 1
• Views: 11,310
07-19-2010, 10:28 PM
24. ### European Social Survey -- income variable

If you have worked with the ESS and are familiar with the vagaries of the income variable, perhaps you can help me identify a solution to a specific...

• Replies: 15
• Views: 10,875
01-16-2015, 07:43 AM
25. ### 2-WAY ANOVA - with only means, SD & sample size

Hello all. I hope this is the correct forum for this query - my apologies if best placed elsewhere. As part of my doctoral research I'm looking to...

• Replies: 3
• Views: 10,610
05-22-2012, 04:30 AM
26. ### Hotelling's T

The matter I see in Wikipedia on Hoteling's T is unintelligible for me. How do we calculate Hoteling's T? Some easy method, please.

• Replies: 7
• Views: 10,559
08-10-2010, 10:27 AM
27. ### Determanistic vs Stochastic trend

Trends may be either determanistic or stochastic in nature and assuming one is the other causes both forecasting and other errors. The trick is...

• Replies: 45
• Views: 10,470
12-03-2013, 12:12 PM
28. ### Two sets of time-series data. What type of test?

As the title suggests, my goal is to compare two sets of time-series data. This is the scenario: -Two air samplers are measuring for...

• Replies: 3
• Views: 10,330
06-12-2013, 11:13 PM
29. ### Small sample size...

Hi, I have a small sample size of times for a specific event (no way to increase sample size at the moment...). I have only 2 times, thus running a...

• Replies: 10
• Views: 9,751
08-16-2010, 10:47 PM
30. ### Correlogram, Periodogram, Partial correlogram

Hi, I am helping someone to analyze a data set . He had to make periodogram, correlogram, and partial correlogram, I made them using excel add ins...

• Replies: 2
• Views: 9,741
07-17-2010, 12:10 AM
31. ### Assembly time for IKEA furniture

Their furniture units have a number of wooden panels & pieces NP and a number of fasteners NF. If I assemble two units of furniture in times X and...

• Replies: 4
• Views: 9,726
03-18-2010, 08:28 AM
32. ### stock market probability

suppose i have the following probabilities of making a profitable stock trade: day 1: 2/3 day 2: 2/3 day 3: 2/2 day 4: 3/4 day 5: 0/2 how...

• Replies: 9
• Views: 9,317
01-31-2013, 10:33 AM
33. ### Adequate sample size determination, p-charts

I am measuring defects vs. encounters of a software application in a healthcare setting, and during an analysis encountered 1 defect in 14000...

• Replies: 5
• Views: 9,288
10-05-2011, 08:04 PM
34. ### Assumptions of time series

I believe, but am not certain, that time series methods which employ regression assume normality and equal error variance. Would you test for these...

• Replies: 15
• Views: 9,240
12-03-2013, 12:25 PM
35. ### A textbook of Time Series Analysis

I obtained a Bachelor Degree in Statistics in 1988. I was separated form this profession for more than 17 years because I was exercising Information...

• Replies: 8
• Views: 9,237
05-16-2008, 02:58 PM
36. ### how to calculate a sample size, when comparing two proportions

I am doing a research proposal as coursework for uni and have to calculate a sample size. I have used russlenth's sample size calculator but have no...

• Replies: 10
• Views: 9,159
03-18-2011, 10:11 AM
37. ### Regress Prices or Returns?

Hey there, I've just started a new job and have been asked to take a look at the historical correlation of the spot gold price with the spot...

• Replies: 1
• Views: 9,122
11-11-2009, 01:07 AM
38. ### Random numbers from normal distribution with given mean, st dev, Min, and Max

Hi All !!! I would appreciate to have hints of the following issue. I was wondering how to get random values from a normal distribution with a...

• Replies: 5
• Views: 9,111
01-30-2013, 11:09 AM
39. ### Correlation for non-random data

Hi I have searched the forum with little luck, so apologies if the answers are blindingly obvious! I am analysing data collected two years ago....

• Replies: 7
• Views: 8,955
11-01-2010, 05:14 AM
40. ### comparing LogLog model and Linear model

Hi everybody, Supposing we have the 2 following models: 1) log(y) = 5a + 3b + 4c + 2log(d) 2) y = 5a + 3b + 4c + 2d How can I compare these...

• Replies: 5
• Views: 8,937
03-20-2011, 10:38 AM
41. ### Missing data in regression

I have an entire population. One of the variable is missing about 12 percent of the data. I believe this is because we have no finished collecting...

• Replies: 27
• Views: 8,905
10-05-2016, 08:57 AM
42. ### Overlapping Normal distributions

Hi all, I am trying to find formulae for calculating the overlap between two normally distributed populations. There are some online calculators...

• Replies: 2
• Views: 8,863
07-19-2010, 10:15 AM
43. ### Simulations

I mean this to be a general thread on simulation but will start with a specific point. The following I know is a trivial example, CI are well...

• Replies: 30
• Views: 8,849
01-09-2015, 03:36 PM
44. ### Homework help

I am in serious need of help when it comes to statistics. I am currently in a statistics course that is a prerequisite, and I have no desire to...

• Replies: 8
• Views: 8,814
12-09-2010, 08:44 PM
45. ### financial return/coefficient of variation

I am moving this question to this forum from the general statistics one because I just realized this forum covers finance. I would greatly...

• Replies: 2
• Views: 8,647
06-16-2010, 03:07 PM
46. ### skewness/kurtosis

Hello How can I determine what the accepted range of Kurtosis and skewness in my data is. I found a formulum in a book, but I can not apply it. It...

• Replies: 4
• Views: 8,566
10-16-2010, 09:11 PM
47. ### LDA vs Cluster Analysis

Hi Guys, I have a basic question... If I have a dataset, containing many variables, and based on that, I want to be able to divide...

• Replies: 4
• Views: 8,499
05-11-2011, 10:16 PM
48. ### Monte Carlo simulations

I am not using this to test the results of violations of statistical assumptions or the like. I am using it to analyze business issues for which no...

• Replies: 24
• Views: 8,440
02-22-2017, 03:15 PM
49. ### When is the difference between various AIC/BIC enough to matter?

It is commonly recommended you use BIC or AIC to choose between models (lower is better). Say you use AIC. Then how far apart between two AIC models...

• Replies: 11
• Views: 8,328
03-31-2014, 03:33 PM
50. ### Outlier analysis with badly skewed data

I have a data set which is badly skewed. It is beyond the acceptable levels (skew over 3) after I remove ten extreme points. So I have two questions....

• Replies: 4
• Views: 8,311
11-04-2011, 03:51 PM
51. ### 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: 8,205
06-29-2015, 03:11 PM
52. ### Exact p-value conflict with exact 95% confidence interval

Dear all, How would you interpret a situation where Pearson's exact p-value is 0.01, but the exact confidence interval for the risk ratio embraces...

• Replies: 6
• Views: 8,089
06-28-2010, 05:43 AM
53. ### Satterthwaite df in t-test

Hello all: I just received a reference text in quality control – Statistical Quality Control by Montgomery 6ed. In describing the (2 sample unequal...

• Replies: 0
• Views: 7,930
01-17-2011, 05:03 PM

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