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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### Sticky: Proof of the day

In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

• Replies: 14
• Views: 18,712
10-11-2014, 12:02 PM
1. ### bridge estimation in linear regression

So the bridge estimates, \beta (which is a vector of \beta_1,...,\beta_p), minimize \sum_{i=1}^n (y_i - x_i^T\beta)^2 +...

• Replies: 0
• Views: 2,336
11-25-2010, 11:53 PM
2. ### brushing up on my basic stats (ANOVA)

I'm taking a design course that's making me revisit some elementary stats ideas that aren't as sharp as they were a year ago. I want to make sure...

• Replies: 1
• Views: 1,669
09-20-2012, 12:25 AM

I'm interested in researching business statistics and possible factors involved which will determine a good business location. For example, If I am...

• Replies: 0
• Views: 1,165
05-23-2015, 04:11 AM
4. ### Business Research, Stratified Sampling and Data Analysis - Need Advice

Dear Forum Members I need some advice on designing a statistical research for my dissertation. I hope I have posted my query in the right section....

• Replies: 1
• Views: 1,299
10-05-2012, 11:30 AM

Hello, I'm about to initiate a price research where I'll examine the optimal price for a product. For the method I'm planning to to a...

• Replies: 0
• Views: 3,288
09-13-2012, 02:59 AM
6. ### By-item random intercepts--to include or not to include?

We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

• Replies: 1
• Views: 2,909
01-01-2010, 02:46 PM
7. ### Calculate chance level in multiple choice

Hello everyone. In short: I would like to know how to compute the chance-level of an 8-alternative multiple choice questionnaire with 6 questions....

• Replies: 0
• Views: 2,414
11-08-2015, 07:27 AM
8. ### Calculate CI for Var of sum of normally dist variables?

Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

• Replies: 0
• Views: 892
02-02-2014, 10:39 AM
9. ### Calculate Market Share (Lender Reputation)

Hi All, I urgently need for help regarding a research I am currently doing. I have a panel data set of syndicated loan transactions...

• Replies: 0
• Views: 1,000
06-19-2015, 03:54 AM
10. ### Calculate sample size?

You are interested in studying the relationship between sodium consumption and the development of hypertension. 32% of Americans are hypertensive...

• Replies: 0
• Views: 955
08-29-2016, 11:28 PM
11. ### Calculate SD from mean and 95% CI

Dear Friends I'm reading a paper that has the following table: Year, n, measure (SD) 2008, 536 0.25 (0.13) 2010, 536 0.21...

• Replies: 7
• Views: 4,600
10-03-2012, 06:31 PM
12. ### Calculate the r-squared in models with more than one predictor/variable? TRICKY!!!

Hi there! CAREFUL, my question isharder than it seems! Ok, we all know that r-squared is : one minus (the sum of squares of the residuals...

• Replies: 0
• Views: 1,264
12-13-2013, 05:32 AM
13. ### Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

• Replies: 0
• Views: 12,182
04-04-2009, 12:32 PM
14. ### Calculating a sample size for a study

Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

• Replies: 3
• Views: 2,841
10-24-2010, 10:24 AM
15. ### Calculating abnormal returns with the calendar time portfolio approach

Hey guys, I want to conduct an event study and since there is a lot of overlapping of the observation windows, I want to use the calendar time...

• Replies: 0
• Views: 4,632
09-20-2013, 03:19 AM
16. ### Calculating and interpreting Spearman's Rank Correlation...

Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

• Replies: 1
• Views: 5,812
12-04-2010, 04:15 AM
17. ### calculating d'

I am working on a project using a 3AFC test and am unsure about how to calculate d' in that scenario. Am I still just using Hits/False Alarms as if...

• Replies: 1
• Views: 1,455
03-27-2012, 01:16 PM
18. ### Calculating Effect Size

Hi everyone I want to calculate the effect size for the national data with sample size more than ten thousand for the Independent Sample t-test and...

• Replies: 7
• Views: 4,512
05-24-2011, 11:57 PM
19. ### Calculating Effect Sizes for Meta Analysis

Hey there! We are conducting a meta analysis (Hunter Schmidt Method) and therefore need to calculate the effect sizes of the different researches...

• Replies: 0
• Views: 1,500
09-18-2014, 05:16 AM
20. ### Calculating forecast error for a long-term volatility forecast

Hi, I am trying to calculate the forecast standard error for a long-term volatility forecast of a time series. I am simply using the unbiased...

• Replies: 0
• Views: 993
08-11-2015, 05:55 AM
21. ### Calculating likelihood for a particular biological sample. Is is possible?

Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis...

• Replies: 0
• Views: 1,020
09-29-2015, 06:42 AM
22. ### Calculating proability

If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

• Replies: 3
• Views: 2,049
06-13-2011, 02:37 PM
23. ### Calculating range

Dear all This is my first question in this forum. I have 100 over medical data points which was measured in different patients practically....

• Replies: 2
• Views: 1,342
04-21-2015, 09:34 AM
24. ### calculating sample size

Hi I am a research project virgin, & I'm having a hard time understanding how you estimate your sample size. My project entails performing a...

• Replies: 1
• Views: 2,556
06-04-2011, 05:17 AM
25. ### Calculating Sample Size for a prospective/longitudinal study

I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

• Replies: 0
• Views: 3,355
02-05-2012, 06:02 AM
26. ### calculating sample size for multi-stage or multiphase experiment

Hi everyone, I am running into a problem that I'm not sure how to solve. Due to budget constraints, we have 5 companies that are willing to...

• Replies: 0
• Views: 1,731
09-29-2014, 02:02 PM
27. ### Calculating significativity on a preference question.

E.g.: 200 consumers test 2 different products, 1 after the other. After they tested and evaluated both products, they have to give their preference....

• Replies: 0
• Views: 1,926
05-18-2011, 04:20 AM
28. ### Calculating Smallest Detectable Difference when mean is around 1 and MSE < 1

Apologies if this is in the wrong forum, and please move if this is the case. Just a query that might be intractable. When calculating Standard...

• Replies: 0
• Views: 2,279
08-26-2013, 03:02 AM
29. ### Calculating variance for variable derived from two correlated variables

Hello, I am analyzing a dataset based on a survey of organic farmers. Among other things, I have data about the farmer's organic seed usage and...

• Replies: 4
• Views: 1,755
08-07-2015, 04:22 PM
30. ### Calculating weighted mean & SD from multiple group data

I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

• Replies: 2
• Views: 4,763
asf
11-21-2012, 07:47 PM
31. ### Calculation of Autocorrelation

Hello, I have a data set of which i calcualte the autocorrelation at lag 1 in SAS ETS (Proc Arima) and SPSS. Then i try to calculate the...

• Replies: 2
• Views: 5,175
11-18-2011, 09:36 AM
32. ### Calibration for COX model

Hi everyone, I'm looking for the methodology to compute the calibration of the COX model with time-dependent, I found few articles on the net...

• Replies: 0
• Views: 3,332
02-09-2011, 09:47 AM
33. ### Call response time distribution [Help needed]

Hello everyone! I'm new to this forum but I want to start off by making a request. The thing is I'm working on a project regarding call-back...

• Replies: 4
• Views: 1,389
BGM
02-05-2015, 01:46 PM
34. ### Can a convenience sample ever be considered truly cross-sectional?

I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

• Replies: 4
• Views: 7,487
09-18-2013, 07:50 AM
35. ### Can a Power Analysis be done on a time series?

I've been doing a lot of reading on the "New Statistics" and I'd be very interested in determining the statistical power of my models based on...

• Replies: 0
• Views: 1,688
01-22-2013, 10:53 AM
36. ### Can anyone explain Poisson regression for doing time trend?

It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

• Replies: 12
• Views: 6,727
02-19-2014, 06:52 PM
37. ### Can anyone help me choose appropriate form(s) of analysis?

Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

• Replies: 6
• Views: 2,780
10-23-2014, 03:35 AM
38. ### Can anyone help please?

Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

• Replies: 3
• Views: 1,715
05-12-2011, 10:59 AM
39. ### Can Factor Analysis be used for non normal distribution ?

Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

• Replies: 3
• Views: 1,626
04-01-2015, 12:43 PM
40. ### Can fixed effects models deal with nested data?

I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

• Replies: 4
• Views: 4,467
03-10-2013, 03:41 PM
41. ### Can I compare regression results with principal component analysis(PCA)

I'm trying to analyze survey data ( 31 response data, and 5 variables, dependent variable is non-parametric (distribution free)). I tried to use...

• Replies: 2
• Views: 1,822
05-01-2014, 07:28 AM
42. ### Can I ignore the third independent variable?

Hi all! Here's some background: I have measured 103 patients' postural steadiness. The independent variables (or within-subject factors) in my...

• Replies: 0
• Views: 2,301
01-16-2012, 09:01 AM
43. ### Can I impute an independent variable with a dependent varible?

I'm building a regression model Y = X1 + X2 + ... + Xn There're about 10% subjects who have missing value on two of the predictors. If I use...

• Replies: 0
• Views: 1,225
07-30-2014, 06:18 PM
44. ### Can I perform logistical regression on a sample of 28

Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

• Replies: 1
• Views: 1,483
02-07-2012, 11:48 AM
45. ### Can I test linear trend in a set of point estimates along with their standard errors?

Hi, I have the following data as an example: time mean s.e. 1 .2 .001 2 .3 .001 3 ...

• Replies: 2
• Views: 1,417
03-26-2014, 07:12 AM
46. ### Can I use a chi-square test for this 2x3 contingency table?

Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

• Replies: 1
• Views: 19,002
07-26-2012, 09:30 PM
47. ### Can I use an independent t-test to test for significant differences over time?

I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to...

• Replies: 0
• Views: 703
04-15-2017, 08:20 AM
48. ### Can I use fishers exact test in this situation?

You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

• Replies: 9
• Views: 1,810
05-22-2017, 08:47 PM
49. ### Can I use gls if I don't need to use mixed models and var is not structured?

I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

• Replies: 5
• Views: 1,771
09-14-2016, 04:01 PM
50. ### Can I use Partial Eta Squared for t-tests?

Hi, I am currently trying to decide which effect size is the most appropriate for my results. I have conducted a repeated measures ANOVA, there...

• Replies: 0
• Views: 1,148
05-22-2015, 05:47 AM
51. ### Can I use regression to increase sample size of survey responders?

I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

• Replies: 1
• Views: 1,195
07-24-2013, 05:26 PM
52. ### Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

• Replies: 3
• Views: 4,757
12-31-2012, 05:39 PM
53. ### Can i use the results from a PCA if the matrix is 'not positive definite'

Hi, I have a 'not positive definite' correlation matrix having done a principal component analysis (PCA) on SPSS. The data i have used is from a...

• Replies: 1
• Views: 735
04-27-2017, 10:47 AM
54. ### Can I used a mixed anova for this case?

I have a study with 1 between-subjects IV (2 levels) and 1 repeated measures IV (3 levels). I am only interested in the between subject main effect...

• Replies: 0
• Views: 1,142
rsm
06-26-2014, 07:24 AM
55. ### Can Mac process 10GB data?

I have got a very large dataset and need a computer that has the capacity of processing 10GB data. Is an Mac a good option? Also, what kind of...

• Replies: 0
• Views: 1,162
03-05-2013, 10:45 PM
56. ### can non parametric tests be modified for one tailed tests?

Hello all, super newbie here. just a quick question: I have been doing one tailed independent two sample t tests but now on other data I no...

• Replies: 3
• Views: 1,345
03-05-2014, 04:29 AM

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