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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: 19,403
10-11-2014, 12:02 PM
1. ### 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: 2,328
07-20-2014, 09:23 PM
2. ### Inference on the standard deviation for non-normal distributions

Hello all, I wanted to ask how do I make inference (confidence intervals, hypothesis testing, etc...) on the the standard deviation or variance,...

• Replies: 2
• Views: 1,151
07-20-2014, 09:44 AM
3. ### Comparison of two treatments (paired and unpaired)

Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

• Replies: 0
• Views: 1,235
07-19-2014, 03:02 AM
4. ### Difference in difference problem.

Hi. I want to examine the effects of a legislative amendment on limited liability companies. I am using a binary variable as my dependent...

• Replies: 0
• Views: 2,199
07-18-2014, 09:01 AM
5. ### Randomized controlled trial sample size calculation

Well I just realized this is definitely in the wrong forum can someone please delete this thread? I can't seem to find an option for that myself.. ...

• Replies: 1
• Views: 2,341
07-17-2014, 01:17 PM
6. ### Which approach to use for designing my experiments (DoE)?

Hi all and welcome to my first post. I am new to the field of DoE and did a lot of background reading. Now, I need to design a series of...

• Replies: 2
• Views: 1,550
07-15-2014, 02:03 PM
7. ### Determining sample size in a factorial repeated measures ANOVA using GPower

Hi all Can anybody tell me which F-test option in G power 3.1.9.2 is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

• Replies: 0
• Views: 3,038
07-15-2014, 11:35 AM
8. ### Is it possible to plot pdf from moments ??

Hi guys, I'm a mechanical engineering student and new to statistics. I'm facing a little bit of a problem with pdfs. I have used the Quadrature...

• Replies: 1
• Views: 1,612
07-15-2014, 01:57 AM
9. ### 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: 1,630
07-14-2014, 10:16 AM
10. ### Confidence interval for N, based on binomial

Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

• Replies: 0
• Views: 1,427
07-14-2014, 03:59 AM
11. ### EVIEWS 7: help required in analysis of Common Effect Model

Dear All, I m a new user and need to know how to interpret the following output. Its urgent. please help: Dependent Variable: FDI_? ...

• Replies: 0
• Views: 1,274
07-12-2014, 12:16 PM
12. ### Determining Sample Size for Quality Audit

I hope I am posting this to the right section, I really have no idea about statistics. I work for a healthcare company working in residential...

• Replies: 0
• Views: 2,174
07-11-2014, 03:01 AM
13. ### how to calculate SD or SEM of ratios?

I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

• Replies: 3
• Views: 3,572
07-10-2014, 08:34 AM
14. ### Individual score to group mean comparison! Which test?

Hello guys! I studied a lot of statistics during my psychology degree and masters in 2000-04 but I got very rusty since then! I tried to brush up...

• Replies: 2
• Views: 4,248
07-10-2014, 05:10 AM
15. ### kruskal wallis aflatoxins

I have been analyzing aflatoxins in various nuts. The whole population contained about 130 nuts. In only 9 (5 almonds, 3 hazelnuts and 1 pistachio)...

• Replies: 2
• Views: 1,926
ivn
07-08-2014, 02:24 PM
16. ### Sample Size Calculation for Kruskal Wallis test

Sorry if posted in wrong forum As the title says it all, how to calculate a sample size for KW test? I'm a bit of a beginner here, should we just...

• Replies: 3
• Views: 4,625
07-08-2014, 12:13 AM
17. ### Can you assign new observations into existing clusters?

Have never done cluster analysis. Is a scenario like this possible/recommended... 1. Run 100 observations thru cluster analysis and end up with 4...

• Replies: 5
• Views: 4,187
07-07-2014, 03:45 PM
18. ### Incorporating correlation between parameters using variation-covariance matrix

Hi all, My colleagues and I are working on a project (i.e., health economics model) where we have fitted parametric curves (using Weibull,...

• Replies: 0
• Views: 1,441
07-07-2014, 03:40 PM
19. ### selecting correct statistic

Hello, I am wondering if I need to determine a statistic to say that each measured variable is significantly different from each other. The value...

• Replies: 0
• Views: 1,296
07-06-2014, 05:50 PM
20. ### Comparing 2 groups of means ! shoud I use letters ?

Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

• Replies: 0
• Views: 1,529
07-06-2014, 10:15 AM
21. ### Performing a Simple Network Analysis

Hi, I have recently been trying to carry out network analysis to study the community structure of bacteria (OTUs) within the gut of mice. I have...

• Replies: 0
• Views: 1,330
07-04-2014, 03:51 AM
22. ### Should I substract the mean before cross-correlation in a particular case or not?

Hello, I have a question about the cross-correlation. I have 2 data sets, one is binned and another is not, 9000 values every. Something like this:...

• Replies: 0
• Views: 2,011
07-01-2014, 05:19 AM
23. ### Effect size for small non-parametric data

Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

• Replies: 5
• Views: 3,501
06-30-2014, 06:25 PM
24. ### Urgent need of help!!!

Hi, I did an online cross-sectional self-questionnaire for male participants only and I am stuck on what method to use when analyzing the data. ...

• Replies: 0
• Views: 1,515
06-30-2014, 07:58 AM
25. ### Polychoric Principal Component Analysis

Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

• Replies: 19
• Views: 8,142
06-27-2014, 01:30 PM
26. ### 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: 1,250
rsm
06-26-2014, 07:24 AM
27. ### Need help with Multiple Imputations ("pooled" dataset)

Hello everybody, My original data set (n=901) contains missing values (10-20% per variable). I am applying Multiple Imputations technique using...

• Replies: 8
• Views: 4,146
06-23-2014, 02:07 PM
28. ### Compute an optimization stress from size distribution density and abundance

Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

• Replies: 0
• Views: 1,393
06-23-2014, 04:56 AM
29. ### Bayes statistics - sensitivity to priors

Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

• Replies: 5
• Views: 2,297
06-22-2014, 01:53 AM
30. ### Have population, use inferential stats? Non-normal dependent variable, what to do?

Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

• Replies: 1
• Views: 1,428
06-20-2014, 09:07 PM
31. ### how to analyse samples with different distribution?

I have sample 1 with normal distribution and sample 2 with not normal distribution. I want to compare the means of both the samples.Can I compare...

• Replies: 3
• Views: 1,851
06-20-2014, 07:33 PM
32. ### Performance of CSIs at Crime Scenes

Hi, Im after some advice, which i would really appreciate assistance with. At our police force the CSIs are being performance tested by use of...

• Replies: 3
• Views: 2,425
06-19-2014, 06:27 AM
33. ### Unbalanced sample - which test do I use?

I have two samples - group 1 has 26 participants / group 2 has 44 participants I was planning to use a two-way anova to analyze various aspects of...

• Replies: 4
• Views: 1,628
06-17-2014, 01:16 PM
34. ### Interaction or moderation effect - suitable method for analysis?

I have run a two-way between groups ANOVA to analyse my data. However, I have one more variable, which is not one of the factors in the ANOVA. I want...

• Replies: 3
• Views: 2,122
06-17-2014, 08:16 AM
35. ### How to analyze a variable measured on a Likert scale and its interaction with another

0 down vote favorite I have to analyze this variable which consists of scores given to 3 items (1-9 scale). This "likert scale" measures "brand...

• Replies: 0
• Views: 1,177
06-17-2014, 07:30 AM
36. ### confidence interval for the median(Wilcoxon)

Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

• Replies: 0
• Views: 1,286
06-16-2014, 02:35 PM
37. ### Which statistical test to use?

Hi guys, I am posting to gain a bit of advice on which statistical test to use for our current research study. We are due to meet with our...

• Replies: 1
• Views: 1,180
06-13-2014, 10:24 AM

hi..i have a cohort of clinical samples which has many parameters like age, sex, clinical grade etc...for each clinical samples, i have five...

• Replies: 0
• Views: 1,278
06-12-2014, 06:09 AM
39. ### Sample difference in repeated designs with control

Hi everyone, as my computer crashed a few days ago, I lost the source to an article I was reading referring to how large the sample size deviation...

• Replies: 0
• Views: 1,442
06-12-2014, 03:37 AM
40. ### canonical correlation in discriminant analysis

I know it represents how good a variable discriminates, but what is the range of this? What does it actually mean when for example the canonical...

• Replies: 0
• Views: 1,635
06-10-2014, 12:09 PM
41. ### Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

• Replies: 0
• Views: 1,227
06-10-2014, 09:59 AM
42. ### Looking for litterature on Markov chains

I am looking for a test for reducing the order of a markov chain with state space {0,1} from k to 0. The chain is observed only once for length T. ...

• Replies: 0
• Views: 1,353
06-09-2014, 07:49 AM
43. ### Interaction/Moderation effect in ANOVA - variable is not one of the factors

I am running an univariate ANOVA in SPSS to test my hypotheses for my 3x2 between subjects design experiment. The factors for the ANOVA are review...

• Replies: 0
• Views: 1,037
06-07-2014, 04:57 AM
44. ### Any stats tests I can run to show inconsistency/ no correlation?

Hi, I am doing my msc dissertation and I have gathered 204 responses to a questionnaire with one of the main questions being what exercises specific...

• Replies: 6
• Views: 1,701
06-06-2014, 06:13 PM
45. ### Exchangeable or Unstructured GEE

Hi all, I was wondering if someone can give me a clear understanding on the difference between exchangeable working correlation matrix and...

• Replies: 1
• Views: 5,385
06-06-2014, 08:07 AM
46. ### Multidimensional Scaling - Can I split the comparisons between respondents?

Good evening, For my master thesis I am conducting research in which I want to make decompositional comparisons for Multidimensional Scaling with...

• Replies: 0
• Views: 1,813
06-05-2014, 01:51 PM
47. ### *stats analysis help of complaints*

Hi, I have to see if there is a significant difference in number of complaints per person. The data is as follows: A – 22 B - 17 C - 14 D...

• Replies: 0
• Views: 1,727
06-05-2014, 11:40 AM
48. ### Matched Cohort methods/techniques?

Hi all: I've been working on a matched cohort type analysis for several weeks and am at an apparent stand still in terms of creating a suitable...

• Replies: 1
• Views: 1,865
06-05-2014, 11:40 AM
49. ### Are these dependent samples?

Hello everyone, I have a dataset with 6,000 respondents. A regression analysis will be run on it. Then, I will break down the dataset into three...

• Replies: 7
• Views: 1,789
06-05-2014, 06:46 AM
50. ### how to Compare means of first differenced stationary time series

hello! I have a monthly data series of commodity spot prices from 1994 to 2010. I have split the data from 1994 to 2002 and 2003 to 2010 due to...

• Replies: 0
• Views: 1,268
06-03-2014, 11:34 PM
51. ### Re-distributing a survey to some of the same people-- is this a problem?

Apologies if this is the wrong subsection. I want to try to replicate some findings from a survey I distributed a few years ago (the sample size...

• Replies: 2
• Views: 1,560
06-03-2014, 03:15 AM
52. ### How to determine margin of error & power of a survey after completion of data collect

We have conducted a telephone interview survey with a sample size nearer to nationally representative, then conducted the interview by calling...

• Replies: 0
• Views: 1,039
06-01-2014, 11:25 PM
53. ### Invasive mussels: use ANOVA or another type of analysis

Hope this is right place for this: I am a PhD student studying performance and population dynamics of invasive freshwater mussels (zebra and quagga...

• Replies: 3
• Views: 1,475
05-30-2014, 10:30 AM
54. ### What kind of analysis is this?

This is for a different chapter than my other post: I'll be sampling the effects of water flow velocity and calcium content on performance of two...

• Replies: 0
• Views: 1,130
05-30-2014, 02:56 AM
55. ### Percentage and probability

I have this problem I am trying to solve and I am not sure how. Lets say 70% of the demography is white people. Now if I randomly pick 100 people...

• Replies: 3
• Views: 2,233
05-29-2014, 09:03 PM
56. ### What is booster sampling?

We are doing convenient sampling rather than random sampling for a research that we are conducting. The authority is concerned about the reliability...

• Replies: 1
• Views: 5,443
05-29-2014, 01:47 AM
57. ### Noob Question - Offensive/Defensive rating

The basic questions is how to calculate a defensive and offensive rating for a team in sport, when both ratings take into account the other rating...

• Replies: 2
• Views: 2,109
05-22-2014, 02:05 PM

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