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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: 18,772
10-11-2014, 12:02 PM
1. ### Probability distribution function

Can somebody explain what is probability distribution function and probability density function in layman terms?? Thanks

• Replies: 0
• Views: 1,517
03-12-2016, 03:51 PM
2. ### Effect-size Two-way ANOVA repeated measures

Dear statistical experts, I am getting confused on how to compute effect size in two-way ANOVA with repeated measures. - Should I use Cohen d...

• Replies: 0
• Views: 1,934
09-30-2015, 06:14 AM
3. ### Statistical analysis on redistricting and women in office; sample size, ideas??

Okay. I have this huge paper that I've been working on for umpteen thousand years. I really need to graduate from college. The question: how does...

• Replies: 0
• Views: 1,025
10-20-2015, 06:24 AM
4. ### Difference between samples in terms of frequency ranks

I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013;...

• Replies: 0
• Views: 1,293
10-07-2015, 01:57 AM
5. ### Choosing test for dependent anonymous sample comparisons

I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The...

• Replies: 0
• Views: 1,042
10-08-2015, 07:24 AM
6. ### Testing of correlation coefficients

Hello, I am wondering if there is any way to test the significance of the correlation coefficients provided in the Eviews 7 cross-correlogram....

• Replies: 0
• Views: 1,046
10-11-2015, 02:46 PM
7. ### Multiple correspondence analysis with fuzzy coding

Hello, I have a data set with six continuous variables. I would like to perform a multiple correspondence analysis (MCA) with fuzzy coding. I was...

• Replies: 0
• Views: 1,319
10-12-2015, 08:42 AM
8. ### sample size for repeated measures

Greetings everyone, a friend needs some stats help on her doctoral thesis. She is conducting a longitudinal, follow up, study on the same...

• Replies: 0
• Views: 1,312
ivn
10-29-2015, 02:41 AM
9. ### Multivariate generalization of Poisson-Gamma model?

Hello! I actually assumed it would be easy to find a multivariate version of the Poisson distribution, but couldn't find any concrete solution (in...

• Replies: 0
• Views: 1,240
10-29-2015, 08:01 AM
10. ### Trouble with 3D geometric morphometrics/PCAs

Hi all, I've been doing some 3D shape analyses using landmarks and analysed the resulting data using PCAs. I'm not very familiar with all this so...

• Replies: 0
• Views: 1,092
11-05-2015, 05:52 AM
11. ### 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: 2,445
11-08-2015, 07:27 AM
12. ### Hybrid Network Inference

I'm trying to figure out how to calculate the result mean and variance for a simple hybrid bayesian network comprised of 2 variables (to keep things...

• Replies: 0
• Views: 1,117
11-12-2015, 09:30 AM
13. ### 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: 920
11-14-2015, 11:09 PM
14. ### How to differentiate between a global and a local method?

Hello, I am trying to write a report based on prediction models and my topic requires me to cover one global method(regression for example) and a...

• Replies: 0
• Views: 1,450
11-16-2015, 07:01 PM
15. ### Justification for running an ANOVA after receiving non significant results on MANOVA

Hi I ran a MANOVA model, with 2 DV's (2 groups of adolescents) and 1 IV with 3 categories ("strategies"). I got a non significant result, with P....

• Replies: 0
• Views: 1,274
11-15-2015, 06:17 AM
16. ### Testing Model Fit between Subsets of Data When Using Multilevel Models

When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

• Replies: 0
• Views: 1,100
11-18-2015, 03:49 PM
17. ### Identifying relevant predictors and interactions

I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

• Replies: 0
• Views: 868
11-23-2015, 05:57 AM
18. ### APA report format

I have performed the Welch ANOVA due to the violation of homogeneity of variance. The df shown in spss is (2,164,078) Should I report this value,...

• Replies: 0
• Views: 1,061
12-12-2015, 08:21 AM
19. ### Enrichment / over-representation of pairs, triplets, quadruples, etc.

Due to a lack of interest from users for over a month I would like to delete this thread.

• Replies: 0
• Views: 887
12-19-2015, 04:01 PM
20. ### what does rejecting the hypothesis mean

Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to...

• Replies: 0
• Views: 753
12-28-2015, 06:34 AM
21. ### Should I use Bonferroni (or other similar corrections)?

Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

• Replies: 0
• Views: 1,116
01-08-2016, 03:57 AM
22. ### What tests should I use when my moderator is discrete?

Hello everybody, I am currently in the final phase of my master thesis. I have collected my data and I am trying to do my statistical tests, but I...

• Replies: 0
• Views: 1,006
01-14-2016, 10:38 AM
23. ### Using standard deviation on two mean values of two different instruments

Hi all, I'm making a research and doing a final data analysis. The research was undertaken using a questionnaire and then structured interviews....

• Replies: 0
• Views: 625
01-14-2016, 01:49 PM
24. ### How do i analyze the following results statistically?

In an animal experiment study, efficacy/preference of an energy drink was compared against the individual compounds present in it. 3 groups were...

• Replies: 0
• Views: 947
01-24-2016, 10:34 PM
25. ### Question about type of research

Hello guys!:) I wonder whether anyone of you who is killing in statistics could give an advice. I am writing my master thesis at the moment. The...

• Replies: 0
• Views: 1,115
01-30-2016, 11:30 AM
26. ### Recognition of multiple spacial patterns

Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

• Replies: 0
• Views: 1,011
01-31-2016, 07:42 AM
27. ### Question concerning an "unusual" research design

Hey everyone, I have a question concerning a between group research-design and I wonder if it is very wise since I never came across a similar...

• Replies: 0
• Views: 1,191
02-04-2016, 03:11 PM
28. ### SPSS-Uneven Sample Size and choice of analysis for two fixed factors with 4 variables

Hi All, I have a dilemma that I have been trying to find the answers myself but cant seem to find anything to solve my problem. I have...

• Replies: 0
• Views: 986
02-10-2016, 02:19 AM
29. ### Structural Model & Fit Indices

I am new to the statistical area. I have a test that uses a Structural Model that is used to test the causal hypothesis between independent variables...

• Replies: 0
• Views: 955
02-11-2016, 12:56 AM
30. ### question about change in period

Hello guys:) I wonder whether you can help me. I do not know which analysis i can use. My aim is to prove or not the following hypothesis: ...

• Replies: 0
• Views: 843
02-12-2016, 07:10 PM
31. ### Need a methodology to predict car sales from various showrooms in a district

Data Assumptions: The sales on a particular day is always 60 There are 3 showrooms in the district There are other factors too(I have omitted the...

• Replies: 0
• Views: 1,043
04-19-2016, 04:44 AM
32. ### Significance test for 13 dichotomous DVs?

I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

• Replies: 0
• Views: 1,265
02-18-2016, 12:34 PM
33. ### Data Analysis visualization

Hi Everyone, Lately I have been searching a data analyzer tool/software, which would also present my data in a better way. I came across DataPlay...

• Replies: 0
• Views: 1,050
02-26-2016, 03:07 AM
34. ### Which test to use for these variables and their associations

Hey, I have some questions about which test I can or have to use. Which test do I use to only identify if there is a relationship between those...

• Replies: 0
• Views: 806
03-01-2016, 08:29 AM
35. ### Power and sample size calculation for neuroscience

Dear TalkStats, I have searched the forum but cannot find the answer I am looking for, if you could help that would be great! I am recording...

• Replies: 0
• Views: 1,574
03-09-2016, 04:45 AM
36. ### Kendall's tau-c testing significance

Hi! I'm very new with statistical research and I need a simple explanation how to test is my correlation what I have with my Kendall's tau-c test...

• Replies: 0
• Views: 1,562
03-11-2016, 01:39 PM
37. ### estimate a range of measures

Hello everyone, I am a statistics student, I'm studying for a project in my University. I have to analyze the data, I have available the measures in...

• Replies: 0
• Views: 1,006
03-12-2016, 05:41 AM
38. ### 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: 2,896
03-24-2016, 12:35 PM
39. ### Reliability in observational research

Hi, everybody I am currently writing my master's degree. In relation to this I have come across a problem regarding reliability in two of my...

• Replies: 0
• Views: 1,835
03-15-2016, 02:24 PM
40. ### Problem with the reliability analysis and factor analysis.

Hi, As I am working on the statistical research for my graduation, I encountered two problems; 1) I am measuring two multi-dimensional...

• Replies: 0
• Views: 1,019
03-17-2016, 08:45 AM
41. ### Anova or t-test on squared errors

I have two forecasting models, moving average and single exponential smoothing. The values of Mean Absolute Percentage Error (MAPE) is 5.2%, 5.8%....

• Replies: 0
• Views: 1,396
03-16-2016, 05:13 AM
42. ### Question on the merits of mediation analysis Vs another analysis (described within)

Hello, I have a dataset involving an intervention (placebo versus real) - denoted as X, an outcome (Y), and a physiological variable (M) that I...

• Replies: 0
• Views: 1,361
04-05-2016, 07:40 AM
43. ### standardize by population density

I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

• Replies: 0
• Views: 597
04-11-2016, 09:57 AM
44. ### How can I analyse this data is the best way possible?

How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

• Replies: 0
• Views: 865
04-17-2016, 04:46 AM
45. ### Policy chance analysis - time series count data

Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

• Replies: 0
• Views: 921
04-18-2016, 07:01 AM
46. ### How to apply Chi Squared test according to this Simulation?

Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my...

• Replies: 0
• Views: 905
04-19-2016, 04:24 PM
47. ### 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: 1,237
04-19-2016, 05:21 PM
48. ### Staff performance comparison between staff and overall metric

"Age Group" "Members in 2015" "Complaints in (2015)" "Staff 1 Members in 2016" "Staff 1 Complaints in 2016" "Staff 2 Members in 2016" "Staff 2...

• Replies: 0
• Views: 1,516
04-22-2016, 11:25 AM
49. ### Need help for an analysis

Hi I'm working in a textile company that have stores in many countries.While planning quantities of product,we are considering of product display...

• Replies: 0
• Views: 1,307
04-27-2016, 02:26 PM
50. ### Average height of population

I am trying to figure out how many samples to take from known population to be accurate within 95%. For example to find average height and...

• Replies: 0
• Views: 791
04-28-2016, 08:56 PM
51. ### Threshold Autoregressive (TAR) Model with exogenous variables (TARX)

Anyone have experience with these models? From what I remember about VAR is that adding exogenous variables to model a VARX is straightforward....

• Replies: 0
• Views: 794
05-02-2016, 07:42 PM
52. ### Randomised Complete Block Design (RCBD)

During the cotton-spinning process, a strand of cotton thicker than the final thread is produced, and then twisted before it is wound onto a bobbin....

• Replies: 0
• Views: 1,098
05-03-2016, 01:36 PM
53. ### Difference between expected spending and observed spending. What kind of statistical

I would like some advice from you about what kind of statistical analysis I could do about that data. My case is as follows: According to a...

• Replies: 0
• Views: 2,178
05-04-2016, 12:02 AM
54. ### Problem in Structural Breaks

Suppose, if I draw samples of different sizes at time t=1,2,..,T,T+1,..,2T where the sample sizes could be different and the observed variable is a...

• Replies: 0
• Views: 1,107
05-10-2016, 12:17 AM
55. ### [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

• Replies: 0
• Views: 652
05-12-2016, 03:18 PM
56. ### Standard error of measurement (SEM) consistency - what's the formula?

Hello, everyone How to calculate the standard error of measurement (SEM) but for consistency? I would like to find the formula and the paper which...

• Replies: 0
• Views: 755
05-13-2016, 11:47 AM
57. ### Suggest a research design.

I am currently doing research assignment which is to design a program evaluation and need to seek advise on some research questions. As a person...

• Replies: 0
• Views: 527
05-17-2016, 08:54 AM
58. ### How to apply syntax to specific data?

Hi there - I need to convert some raw data into categories via a calculation which turns the raw data into angles (to establish specific groups). I...

• Replies: 0
• Views: 938
05-17-2016, 09:50 AM
59. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 871
05-21-2016, 11:45 AM

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