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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: 19,443
10-11-2014, 12:02 PM
1. small sample size

hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

• Replies: 0
• Views: 763
05-19-2015, 01:02 AM
2. geometric argument for constraints on r_xz given r_xy and r_yz

Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

• Replies: 5
• Views: 4,212
05-18-2015, 04:16 PM
3. PCA use

Hi everybody, Is PCA used to see whether a set of designed items to measure something actually do it? It's a big panic for me. Thank you very much

• Replies: 2
• Views: 1,308
05-18-2015, 12:27 PM
4. Research Problem (Hypothesis and Data Analysis)

I am conducting a research on the influence of school administrators on teachers’ retention. I have collected data on this with likert-scaled (5...

• Replies: 0
• Views: 1,210
05-16-2015, 07:10 AM
5. Terminology for comparing reference questions to answers after a policy change

Hi, I´m conducting a questionnaire in order to examine the behavior of drivers of electric vehicles when providing information, such as parking...

• Replies: 0
• Views: 1,006
05-16-2015, 05:35 AM
6. Three group intervention, confused about study design and analysis

Please refer to updated post.

• Replies: 0
• Views: 1,316
05-14-2015, 05:27 PM
7. question regarding Non Parametric Test

Hi all, I want to test the relation between dependent varaiable and other independent variables, my sample is Companies registered in the...

• Replies: 1
• Views: 1,135
05-14-2015, 02:22 AM
8. Raw Data vs Frequency Distribution

Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

• Replies: 6
• Views: 6,097
05-11-2015, 07:48 AM
9. Question Regarding Research Design

If I have a dataset with 100 unspecified cases and I know from a previous chart review that the likelihood is that 10% of these are indeed cases how...

• Replies: 2
• Views: 1,385
05-10-2015, 10:47 PM
10. Composite Hypothesis Testing Problem

Hello guys, So I have this problem I am trying to solve and its

• Replies: 0
• Views: 1,007
05-10-2015, 04:48 PM
11. How to obtain individual factor scores after PCAs on multple imputed datsets???

Hello, I really hope, someone here can help me, I've searched the internet for hours and could not get any clue on how to solve my problem. I...

• Replies: 14
• Views: 6,777
05-09-2015, 07:04 AM
12. huge differences in R2 between OLS and ordered logit regression model

I was wondering why I get huge differences in R2 when running a ordered logit model and a OLS model. I use the same DV and IVs for both models. The...

• Replies: 2
• Views: 1,405
05-07-2015, 10:08 AM
13. R-squared in MANOVA

I performed a (k-means) clusteranalysis and want to use the % of explained variance as a measure for the fit of the 2-, 3-, 4- and 5 clustersolutions...

• Replies: 0
• Views: 2,350
05-06-2015, 04:23 AM
14. Combining two samples to then do Cluster Analysis/multivariate analysis

I was wondering if someone can help. For a university assignment I have been asked to propose a marketing research method & survey etc for a...

• Replies: 0
• Views: 1,162
05-03-2015, 04:25 PM
15. Comparison of time series nested in Repeated Measures Design

Post deleted cause it garnered no responses on this forum....

• Replies: 0
• Views: 1,748
04-30-2015, 11:30 AM
16. Fitindices to determine optimal clustersolution in clusteranalysis

Hello, My question is about the selection of the optimal cluster solution. I have used SPSS version 21.0 to perform a cluster analysis in which...

• Replies: 0
• Views: 746
04-29-2015, 04:53 AM
17. Feedback on bootstrapping effect size and t-values

I am trying to learn to bootstrap per conversation here the other day. I know there are packages to bootstrap but wanted to process more...

• Replies: 31
• Views: 5,141
04-28-2015, 09:25 PM
18. Blocked ANOVA: unequal amount of data for the different blocks?

Hi guys, So I'm conducting an experiment where I'm using a blocked ANOVA and have a few questions about my data set. I'm looking at the abundance...

• Replies: 0
• Views: 1,352
04-28-2015, 08:15 PM
19. Converting Correlation to Effect Size

Has anyone had experience of converting various indicators of effect size (students t, odds ratio, correlation etc.) to Cohen's d effect size? ...

• Replies: 2
• Views: 1,624
04-28-2015, 04:43 AM
20. Kendall's Tau

As part of my analysis report I did a chi square test. However, since my tables are too large normal post hoc procedure could not be followed....

• Replies: 2
• Views: 1,622
04-22-2015, 03:48 PM
21. Analysis of counts data from consumer test

Hi everyone, First of all I'm new to this forum so my apologies in advance for the mistakes I could do by posting here. My issue is the...

• Replies: 2
• Views: 1,402
04-22-2015, 10:33 AM
22. Visual display of one-tailed tests

I am trying to show the results of an analysis with one tailed tests in a figure. The model uses logistic regression, with a interval variable as...

• Replies: 2
• Views: 1,065
04-21-2015, 10:28 AM
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: 1,424
04-21-2015, 09:34 AM
24. problem with calculating total score on SPSS

Hi everyone, I am having a problem with calculating total scores for my measuring instruments on SPSS. If a case has a missing value on one item...

• Replies: 1
• Views: 2,242
04-21-2015, 08:16 AM
25. Method to estimate whether two data sets are from the same distribution

Hello, I have two data sets from two different experiments. I would like to know whether there exist Bayesian (or frequentist) methods which would...

• Replies: 4
• Views: 2,138
04-20-2015, 04:13 PM
26. reduced-form system

Hi, I am buiding a supply and demand model. I have one price and one demand equation and would like to compare the different coeffecients through...

• Replies: 2
• Views: 1,345
04-19-2015, 10:11 AM
27. Price forecasting model

I am working on a problem where I have an item 'x' which is available in local market and 'x' is produced using item 'y'.Item 'y' is traded in...

• Replies: 2
• Views: 2,114
04-18-2015, 11:57 PM
28. help with finding corelation of 2 variable data

Hi all This is my first post May be this is a dumb question but I need quick help please I have data for 95 people Outcome scored by doctors...

• Replies: 0
• Views: 2,090
04-17-2015, 12:46 PM
29. Meta Analysis: combining effect sizes from means/SDs , F statistics and t statistics

After coding several hundred papers, I have accumulated a list of effect sizes (Cohen's d) for various learning interventions. Most of these have...

• Replies: 0
• Views: 1,975
04-16-2015, 06:52 PM
30. Time 2 Sample Size

Hi I was hoping for some advice. I'm looking at the same sample at 2 timepoints. At the first time point I had 95 participants and at follow up I...

• Replies: 2
• Views: 1,514
04-16-2015, 01:26 PM
31. Standard Deviation Conversion

For my masters thesis I am conducting a meta-analysis looking at the differences in CHC abilities within Autism Spectrum Disorders. I have gathered...

• Replies: 0
• Views: 1,547
04-16-2015, 04:13 AM
32. Forest plot total calculator for OR and RR

Hi, Im doing a meta-analysis with studies of both case control and cohort and Im trying to put them all together in a forest plot. Hence, I find...

• Replies: 0
• Views: 1,512
04-09-2015, 10:29 PM
33. sample size calcs - why do these produce different results

What are the interpretations for each of these? data a; input z p q e; cards; 1.96 0.95 0.05 0.05 ; data b; set a; ...

• Replies: 2
• Views: 1,391
04-07-2015, 09:53 AM
34. Monte Carlo simulation: how many runs?

Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

• Replies: 12
• Views: 6,705
BGM
04-07-2015, 06:21 AM
35. Which forecast methods?

• Replies: 0
• Views: 1,167
04-02-2015, 05:21 PM
36. margin of error

I have two questions as follows: *Is there a way to apply the margin of error to achieve 99.99% level of confidence? *Can I use the margin of...

• Replies: 1
• Views: 546
04-02-2015, 12:27 PM
37. Bigger sample size and less good results or smaller sample size but better results

I hope this is the right place to post this question. I'm doing my thesis based upon the data of my professors research study. I want to look into...

• Replies: 0
• Views: 1,662
04-02-2015, 10:15 AM
38. 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: 1,746
04-01-2015, 12:43 PM
39. PhD Dissertation Help- General guidance and direction desperately needed!!!!

Hi, I have been reading many of your comments and I was hoping that you could give me advice. I'm currently in my second year of the dissertation...

• Replies: 2
• Views: 1,065
04-01-2015, 08:40 AM
40. Ordinal Regression vs Spearmans Rank Correlation

Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

• Replies: 3
• Views: 3,039
04-01-2015, 06:44 AM
41. heterogenous regression slopes in mancova

Hey guys, I have a little problem with my MANCOVA data (4 DVs, 3 Covariates). For one of the covariates and one of the DVs, the assumption of...

• Replies: 0
• Views: 1,211
mbo
03-29-2015, 07:14 AM
42. Is t-test appropriate for comparing percentages?

I am trying to analyze a seed germination trial comparing 2 different germination treatments. I sowed seeds from 10 individual plants in 10...

• Replies: 1
• Views: 1,346
03-29-2015, 05:57 AM
43. single function of two gaussian distributed variables..

Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

• Replies: 3
• Views: 1,392
03-29-2015, 05:48 AM
44. What statistical test do I use to tell if my data statistically significant?

This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of...

• Replies: 0
• Views: 1,111
03-27-2015, 08:12 PM
45. Interesting abstract question - Statisticians pls chk this

I have a massive dataset (10s of millions of rows and 100s of dimensions). The dimensions are of all conceivable data types. How do I arrive at...

• Replies: 0
• Views: 970
03-27-2015, 02:06 PM
46. Taguchi designs

Dear TalkStats Forum, I am using Taguchi design in my experiments. I have a presentation soon and I want to explain this design in a very dynamic...

• Replies: 1
• Views: 1,465
03-26-2015, 03:31 PM
47. descriptive correlational study

hello! We have a research study entitled "COMPETENCE ON SAFETY PROTOCOLS AMONG HEALTH AND DISASTER COMMITTEE MEMBERS AND DEGREE OF TRUST OF...

• Replies: 1
• Views: 1,294
03-25-2015, 01:30 PM
48. If anyone can help please!! In DESPERATE need of clarification!

Hi Everyone This is my first time on the site. Basically I am conducting some research for a dissertation I have to do as part of my course. ...

• Replies: 2
• Views: 1,321
03-25-2015, 03:17 AM
49. Comparing subsets of data from the same population?

I'm hoping someone can help me conceptualize my question better because I have a feeling I'm looking at it the wrong way. I'm looking at a number of...

• Replies: 0
• Views: 1,396
03-19-2015, 04:16 PM
50. Control Variable as part of the Dependent Variable - Problem? Solutions?

Dear all, I'm currently trying to figure out the following problem: I have a dependent variable which is build as the standard deviation of six...

• Replies: 2
• Views: 1,596
03-19-2015, 08:36 AM
51. Modeling ordinal responses with nested data

Hello, I am preparing a study that would involve modeling responses an ordinal scale. These responses identify the behaviors of high school...

• Replies: 1
• Views: 1,246
03-18-2015, 11:40 AM
52. Statistical Model to Use for 1 independent variable and 2 dependent variables

Hello,i'm Oliver John a civil engineering undergrad student.I'm quiet uncertain unto which statistical analysis should i use for my data consisting...

• Replies: 0
• Views: 1,071
03-17-2015, 01:42 AM
53. Derivation of OLS residuals and asymptotic properties

Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

• Replies: 0
• Views: 1,074
03-11-2015, 07:45 PM
54. [ASK] [Quantification Theory Type I] Kansei Engineering Reference

Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

• Replies: 1
• Views: 3,383
03-11-2015, 05:17 PM

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