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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: 18,620
10-11-2014, 12:02 PM
1. ### Suitable Model

Hi all, I wonder if anyone could help me, i'm looking for an idea or two :) I work in the financial sector and we are looking into ways of...

• Replies: 2
• Views: 1,165
06-12-2015, 02:44 AM
2. ### Graphical Method of Testing Cox Regression Model Fit

Hi all, Since my last post you'll be happy to know i have successfully built a couple of what appear to be reasonable proportional hazard models...

• Replies: 0
• Views: 950
06-17-2015, 10:58 AM
3. ### Insignificant Results

Just ran a simple regression, but got insignificant results. I know this is vague, but anyone have any idea why? Bad theory? Or something wrong in my...

• Replies: 1
• Views: 2,116
08-05-2012, 10:33 PM
4. ### Cell count-which test to choose when comparing two groups to a control?

Hello dear members of the Talkstats forum, In my research we counted algae cells with the counting chamber.N=8.We have the means of these three...

• Replies: 0
• Views: 1,136
03-21-2014, 01:07 PM
5. ### Need help on sampling

I am very new to statistics so forgive my ignorance...I just need some help to get pointed in the right direction. I need to take some baseline...

• Replies: 0
• Views: 2,111
05-19-2009, 07:34 AM
6. ### Perception of non-parametric techniques as inferior?

Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

• Replies: 3
• Views: 9,542
05-08-2009, 06:17 AM
7. ### Randomization in an experiment

Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

• Replies: 0
• Views: 3,524
01-19-2009, 12:19 AM
8. ### Regression on Binned data

Hi, Can I carry out linear regression reliably with binned data. IE. data on cases falling into a series of ranges over time. I can imagine...

• Replies: 0
• Views: 3,591
Cox
11-30-2009, 09:38 AM
9. ### Which statistic should i use?

Hello, I don't know which statistic i should use for my situation: I have 30 spaceships with different caracteristics. I need to buy one,...

• Replies: 3
• Views: 150
CRD
09-28-2017, 11:53 AM
10. ### Looking for a better answer, if there is one (Puzzle)

I've worked out a solution to a problem, but I was wondering if there might be a better way to do this. I'm using a computer to calculate these...

• Replies: 1
• Views: 2,590
10-04-2008, 11:24 AM
11. ### Probability Mass Functions

I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

• Replies: 1
• Views: 3,851
BGM
10-12-2011, 10:53 PM
12. ### Statistical Design of Experiments: Impact of missing and/or changing experiments

Hello, I am new to both this forum and the concept of statistical design so please, treat me like the novice I am! OK, so I am hoping to carry...

• Replies: 1
• Views: 1,696
01-07-2016, 12:07 PM
13. ### Stats Analysis Question =]

Hey Everyone, Question!: In an aged-matched experiment, I want to compare . . . . I want to test the significance of DrugY on performance of...

• Replies: 0
• Views: 1,294
08-03-2012, 07:38 PM
14. ### HELP- Cumulative meta-analyses conceptual question!

Hi, Based on the premise that cumulative meta-analysis is a "chronological combining of the experiments will show if there is a consistency in the...

• Replies: 1
• Views: 1,270
08-14-2016, 08:52 PM
15. ### One Way ANOVA - Dummy Variable and Post-Hoc Questions

Hi Everyone! I am conducting a retrospective research study to determine if a new specific sign of an injury is correlated with more related injuries...

• Replies: 2
• Views: 1,334
02-22-2014, 08:22 PM
16. ### Likert Scale - Issue with Pivot point

Dear all, I conducted a research in the field of construction management measuring the importance of some variables.I submitted the result in a...

• Replies: 0
• Views: 1,659
08-26-2012, 02:34 PM
17. ### Statistical approach to 0 bounded skewed data?

I'm working on a data set (neuronal spike density) that contained a lot 0 values and I am having a hard time trying to come up with a valid...

• Replies: 1
• Views: 2,331
08-12-2012, 11:22 PM
18. ### How to Identify Change from Initial Values in Time Course Data

Hello, I am currently working on my Masters Thesis and am trying to figure out a way to determine when my data is different or not from the...

• Replies: 0
• Views: 902
11-14-2015, 11:09 PM
19. ### Target Value for Chi-Square Test

I am working on a project that essentially involves "reversing" the chi-square test. A client wants to know what the expected value should be to see...

• Replies: 1
• Views: 2,152
01-26-2011, 06:22 PM
20. ### Question - Is Simpson's Paradox the same as spuriousness

Hi all, I am currently trying to learn about research methodology by using the book of Dooley called Social Research Methods. I am however a...

• Replies: 3
• Views: 3,322
11-08-2016, 08:35 AM
21. ### Factor analysis with multiple constructs

Hi all, Have a question related to factor analysis and how to execute it. For instance, in a survey you measure 3 seperate constructs, and use 5...

• Replies: 2
• Views: 1,193
03-24-2017, 08:36 AM
22. ### model selection - keeping binned and continous version of variables in same model

Hello, I have a dataset of about 160,000 observations and I'm trying to build a binary classifier. Lets call my variable to be classified Y and my...

• Replies: 1
• Views: 987
04-22-2014, 09:49 AM
23. ### Missing Data

I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

• Replies: 6
• Views: 1,990
03-21-2012, 09:22 PM
24. ### combining weighted p-values across multiple studies

Hello, I am not someone who is extremely familiar with statistical theory so I have had to do a lot of reading to arrive at these ideas. I am...

• Replies: 0
• Views: 1,395
05-05-2013, 10:24 PM
25. ### combining results obtained from 3 different methods

Hello, I have received data tables where 3 methods have been used on 54 different variables. Method 1 (M1): multivariate model of logistic...

• Replies: 0
• Views: 1,263
08-12-2013, 06:23 PM
26. ### Testing for a difference in standard deviation

Hello Everyone I've encountered the following problem - I have this test that was administrated to a sample of participants, in a 2X2 design (both...

• Replies: 0
• Views: 1,117
02-26-2015, 07:44 AM
27. ### How to report t-test, CIs, cohen's d etc of log-transformed data

I am wondering what is best/normal practice for reporting the results of an independent t-test of log-transformed data? For context, I am...

• Replies: 0
• Views: 289
07-08-2017, 07:57 AM
28. ### A Quick Question Concerning Repeated Measures of ANOVA.

Hello Everyone! I am working on the capstone thesis project for my Master's degree and hoping for some professional assistance to determine if I...

• Replies: 1
• Views: 2,241
10-19-2011, 12:58 PM
29. ### Volume of confidence intervals for Multinomial distributions

Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

• Replies: 0
• Views: 3,359
11-09-2010, 09:50 AM
30. ### Exploratory Factor Analysis problems

Independent Variable: 49 state survey of state court administration: how much power does the state court administrator have over 31 separate...

• Replies: 2
• Views: 1,317
08-12-2015, 07:44 AM
31. ### p value for pooled data

Hi all, In my research analysis, I've used the multiple imputation technique in SPSS to handle missing data. So far, so good. Now I'm running...

• Replies: 2
• Views: 1,477
07-14-2014, 10:16 AM
32. ### Internal consistency reliability

Hi there, I have a question about the internal consistency reliability. In a within-subject design, I created a 13-item of self-repeated 9-point...

• Replies: 0
• Views: 2,942
10-11-2010, 07:52 AM
33. ### No Standard Deviation

Hello statistical geniuses, I have 450 items and I want to test a sample and be sure with 95% confidence that if all of my tested items are...

• Replies: 5
• Views: 1,796
01-13-2014, 04:00 PM
34. ### Best design for this experiment?

Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

• Replies: 16
• Views: 4,870
08-26-2011, 04:55 PM
35. ### ANOVA, Mann-Whitney or both?

I want to calculate the statistics of a clinical study with SPSS. 4 groups with 16 variables and I want to compare the mean values of every...

• Replies: 0
• Views: 1,498
DaH
10-02-2013, 07:57 AM
36. ### Relative importance of predictors in logistic regression

I would like to assess the relative importance of independent variables in a logistic regression model. Previously I have used the 'R' statistic the...

• Replies: 0
• Views: 1,096
11-26-2013, 10:04 AM
37. ### When is standardisation of data necessary?

I am running regression analysis and cluster analysis on a data set. The variables differ in their scale of measurement – some variables are ratings...

• Replies: 0
• Views: 1,097
11-20-2013, 03:32 PM
38. ### Standard error of a weighted composite score

I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

• Replies: 2
• Views: 2,732
11-20-2013, 03:10 PM
39. ### ANOVA of factor analysis results

Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

• Replies: 0
• Views: 3,695
02-01-2011, 12:39 AM
40. ### Standard deviation

I have a population of 229, the mean is 20.8 and the standard deviation is 24.6. What can be concluded from this? Is this significant?

• Replies: 0
• Views: 1,226
04-19-2016, 05:21 PM
41. ### 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: 12,140
04-04-2009, 12:32 PM
42. ### How to calculate sample size and effect size for comparing means from two groups

Hi all, hoping i can find some answers here for a bit of a problem i am having regarding a sample size calculation for a study I am soon to conduct. ...

• Replies: 3
• Views: 1,508
01-31-2016, 03:09 AM
43. ### Do i use an ANCOVA for a cross over of exams, pre/post study?

I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

• Replies: 0
• Views: 2,884
03-24-2016, 12:35 PM
44. ### Quality Control with statistics

I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

• Replies: 0
• Views: 884
11-02-2012, 11:14 AM
45. ### Interval independent variable in binary logistic regression

Hi everyone: I am a bit new to logistic regression and I could use some advice. I am trying to discover the influence of various variables on...

• Replies: 0
• Views: 1,547
12-15-2012, 07:44 AM
46. ### Cumulative heat units - what is a valid way of determining difference between sites

Background: I work for a blueberry grower. The accumulation of heat units is important in understanding and predicting the development of the plant...

• Replies: 0
• Views: 2,216
07-20-2014, 09:23 PM
47. ### Contingency tables with an expected value of 0

Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

• Replies: 6
• Views: 6,980
03-21-2011, 01:34 AM
48. ### When homogeniety of regression slopes (for ANCOVA) is significant.

HI, I have conducted an ANCOVA and have a significant interaction when testing the homogeniety of regression slopes assumption. My IV is Group...

• Replies: 0
• Views: 1,300
03-19-2012, 11:45 PM
49. ### P value significance after FDR correction

Dear stats experts, I have a question I'm hoping someone out there might be able to answer for me. When running FDR corrections on behavioural...

• Replies: 2
• Views: 1,766
08-23-2013, 02:52 PM
50. ### Proposed Research Topic and Design

I am a proposing a research topic and want to see if what I propose is possible given the data I have. If not, I would like to hear your ideas on...

• Replies: 1
• Views: 1,129
05-05-2013, 05:07 PM
51. ### Is there a test...

Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

• Replies: 5
• Views: 1,809
07-23-2014, 10:54 PM
52. ### MLE for correlation (not covariance) matrix?

Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

• Replies: 4
• Views: 3,651
02-08-2013, 11:33 AM
53. ### t-test with class labels as probabilities

I'm trying to find a generalization of the t-test that I'm sure someone has done before; I just can't seem to find a reference, probably because I've...

• Replies: 2
• Views: 1,596
10-14-2013, 02:09 PM
54. ### How do I determine the Correlation Coefficient from a best fitting equation.

I'm confused about how to determine the correlation coefficient after you find a linear regression line formula. I'm porting some linear...

• Replies: 0
• Views: 1,821
08-11-2011, 11:32 AM
55. ### Centering for interactions in multiple regression ??

This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

• Replies: 5
• Views: 25,797
12-01-2008, 06:50 PM
56. ### 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: 6,650
02-19-2014, 06:52 PM
57. ### Giving statistical significance to the max value of a vector

Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

• Replies: 4
• Views: 1,860
10-29-2012, 11:32 AM
58. ### Time Series Dummy Variable and Time Trend

Hi, I currently have some research going on that requires me to put in a time trend variable t = {1,2,3,4,.....,N} where N is the total number of...

• Replies: 1
• Views: 5,178
05-02-2012, 12:04 AM

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