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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: 18,785
10-11-2014, 12:02 PM
1. ### Representing a distance measure with math equation

I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

• Replies: 26
• Views: 5,840
11-11-2013, 04:54 PM
2. ### Overcoming small dataset anomalies in genetic algorithm

Hello Talk Stats, this is my first post on this forum, interestingly typing in modeling forum in google took me to a series of websites that was not...

• Replies: 0
• Views: 1,035
JIB
11-11-2013, 04:32 AM
3. ### Which version of the Chi-Square test should I use?

Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

• Replies: 0
• Views: 943
11-09-2013, 09:53 PM
4. ### How to predict the uncertain parameter

Hi, I am trying to predict the value of a parameter(Y) with varying frequency(X2) and X1(stall parameter). Y X1 ...

• Replies: 1
• Views: 1,504
11-07-2013, 09:56 PM
5. ### What test should I use to analyze my data?

I'm currently a fourth year university student. As part of my studies, I'm taking a class called Capstone, where students design and carry out a...

• Replies: 1
• Views: 2,644
11-05-2013, 05:27 PM
6. ### 3 Groups of Participants & Likert data

Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

• Replies: 7
• Views: 1,953
11-05-2013, 07:00 AM
7. ### Tim series Analysis in EViews

Hello Everyone,I have a question which may be very simple .For Example I have estimated ARIMA(1,1,4) from a data having sample 1961-1999.To produce...

• Replies: 0
• Views: 1,050
11-04-2013, 11:34 PM
8. ### How to create a representative sample?

Hello to all! :) I have recently launched a survey to students of specific universities among European countries and got nearly 3000 replies....

• Replies: 2
• Views: 2,454
11-04-2013, 09:39 PM
9. ### Correlation matrix Not positive definite in PCA

Hi, I am currently working on a project which returns a not positive matrix while conducting a PCA. As a result I don't get the sphericity test...

• Replies: 0
• Views: 1,423
11-01-2013, 08:27 AM
10. ### Identifying subset with maximum averages

Dear all, I am trying to achieve the following task - and I wonder if there are analytical methods in any of the stats packages that can achieve...

• Replies: 0
• Views: 1,384
10-31-2013, 06:16 AM
11. ### Principal Component Analysis in SPSS

Hi, I have two main issues with SPSS. 1. I am currently trying to run a PCA in SPSS with 120 variables and 60 respondents (likert scale data)....

• Replies: 0
• Views: 3,405
10-30-2013, 11:13 AM
12. ### Interpreting Ranking Data

I need help with the interpretation of ranking data. I should start by saying that I’m a writer/editor and have very little knowledge of statistical...

• Replies: 0
• Views: 2,948
10-30-2013, 08:44 AM
13. ### violating assumptions mixed effect models

Dear all, What happens if I use linear mixed effect models and the assumptions are violated (i.e. residuals are not normally distributed and/or...

• Replies: 0
• Views: 1,214
10-28-2013, 10:21 AM
14. ### Reversing a linear model?

Hi, I have a system of equations that I wish to estimate and I wonder if problems arise if I reverse X and Y in a linear model. Here is the...

• Replies: 1
• Views: 2,072
10-27-2013, 06:16 PM
15. ### What should i do next?

Hi all, I want to see the effect of gender changes depending on the race of student when they have drunk driving behaviors. There is an...

• Replies: 0
• Views: 1,072
10-26-2013, 10:13 PM
16. ### What test to compare class data?

I have given a pre and post test to two classes. One class did a particular activity (experimental group) and one class did not (control group). ...

• Replies: 0
• Views: 1,372
10-26-2013, 02:30 PM
17. ### Spatial Statistics and SAS Books

Hi all, I am looking for a book that explains applied Spatial Statistics methodology using SAS. I am interested in Spatial, Spatiotemporal data...

• Replies: 0
• Views: 1,421
szm
10-26-2013, 09:45 AM
18. ### CFA using AMOS: Poor model fit for an instrument

Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

• Replies: 3
• Views: 3,480
10-25-2013, 06:10 PM
19. ### Binning Question

Hi everyone! For logistic regressions, is it ever ok to bin a continuous independent variable and then put both the continuous version and bins...

• Replies: 0
• Views: 1,078
10-24-2013, 04:17 PM
20. ### what test should i use for analysis of data from rct

Hi I am writing a research proposal It is a rct that hopes to refute the null hypothesis the use of clary sage will have no effect on...

• Replies: 2
• Views: 2,254
10-24-2013, 04:29 AM
21. ### Cronbach's Alpha if items are not exposed equally..

Can Cronbach's Alpha be calculated for a survey in which number of questions are not equally exposed to users? Say, I have 40 questions in a test,...

• Replies: 1
• Views: 1,296
10-21-2013, 08:06 AM
22. ### Cumulative Periodogram

Hello, As part of my master's research, I am exploring a cyclic pattern in daily climate data (latent heat flux). To explore this pattern, I...

• Replies: 1
• Views: 5,214
10-20-2013, 11:17 PM
23. ### Unable to determine the right test?

hello, I'm doing a paper on measuring authors productivity and unable to decide what should I use as my statistical test to come up with solid...

• Replies: 8
• Views: 2,399
10-20-2013, 01:09 PM
24. ### Conditional Accuracy Functions

Based on a previous study about reaction time as a proxy for attentional constraint, we are analyzing our data using conditional accuracy functions....

• Replies: 0
• Views: 1,233
10-18-2013, 12:46 PM
25. ### post-hoc test after principal coordinate analysis

Hello, I'm going to explore my dataset, composed by 100 subjects and 14 binary (1,0) variables. I was wondering if my protocol makes sense: 1)...

• Replies: 0
• Views: 1,249
10-18-2013, 05:40 AM
26. ### How to forecast (time series trend) with simple exponential smoothing?

Let's say I have my actual time series data for periods: Year Actual Forecast 2003 738 2004 937 2005 619 2006 862 2007 800 2008 950 ...

• Replies: 0
• Views: 1,412
10-16-2013, 10:06 AM
27. ### What test should have been used...

Done with the assignment ... No replies :(

• Replies: 0
• Views: 1,398
10-15-2013, 08:35 PM
28. ### 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: 1,630
10-14-2013, 02:09 PM
29. ### Statistical significance of the accuracy of two distinct methods

My task to achieve is the following: I have one given dataset at hand. Furthermore, I have given a gold standard I want to compare my results to....

• Replies: 9
• Views: 2,317
10-14-2013, 08:49 AM
30. ### Proper Sampling - Can i sample like this without destroying reliability?

The population that i need to extract a sample from is all firms from country A with activities in country B. The firms are classified into two...

• Replies: 1
• Views: 1,279
10-13-2013, 03:52 PM
31. ### Research topic for Stats Phd, working as Business Analytics Manager

Dear all, I was a Phd student in Math/ISyE department. At the same time I am a Business Analytics Manager at a corporation. I've finished all...

• Replies: 1
• Views: 2,614
10-12-2013, 03:40 AM
32. ### PCA and symmetric distribution.

Hello, I hope you can clarify my doubts. I'm an Italian student of business administration. For my thesis I study the application of PCA method for...

• Replies: 1
• Views: 1,728
10-11-2013, 04:34 PM
33. ### Unweighted population vs weighted population

Hi everyone, I have a dilemma of trying to find how to best read a data. Here is a sample of my data, the question is how frequent do you buy a...

• Replies: 2
• Views: 3,407
10-10-2013, 09:56 PM
34. ### Is non-parametric test necessary for independent Likert-type items?

Hi everyone I am having a difficulty in extending my survey analysis containing Likert-type item/questionnaires. I'll try my best to give a detailed...

• Replies: 7
• Views: 2,343
10-10-2013, 08:04 AM
35. ### How to report Correspondence Analysis

Hi. I'm busy with a scientific research honours thesis, and for my results the statistician at my university conducted a correspondence analysis...

• Replies: 3
• Views: 1,767
10-10-2013, 04:48 AM
36. ### Stat used in Med Articles - HELP

Hi Folks, Just to let you know I didn't even know where to post the thread, so apologize if I am in the wrong section :) I am reviewing articles...

• Replies: 9
• Views: 1,780
10-09-2013, 04:55 AM
37. ### Kendall's W for testing similarity of proportions for non-ranked count data?

Hello forum, I can't find the answer to this anywhere, and I'd really appreciate a helping hand. :confused: I'm doing an MSc project and my...

• Replies: 1
• Views: 1,574
10-08-2013, 08:04 PM
38. ### Estimating a confidence interval for a pooled sample using only descriptive stats

Hi there Sorry for the vague title; I suspect my query is a simple one but I'm not quite sure how to phrase it. I have data on a number of...

• Replies: 0
• Views: 1,605
10-08-2013, 07:03 PM
39. ### Sampling distribution for dissimilarity index

The dissimilarity index is a well known metric used to measure spatial unevenness between two groups. Does anyone know of a sampling distribution...

• Replies: 1
• Views: 1,270
10-08-2013, 04:50 PM
40. ### help with analysis

I conducted a study in which I examined the same subjects in two different modes - day and night. The tests were given in the two situations are the...

• Replies: 0
• Views: 1,161
10-08-2013, 09:27 AM
41. ### Using neares neighbour algorithm to retrofit a control group

In my line of work, we are often tasked with measuring the effects of an intervention a bit too late to be involved in the selection of who gets an...

• Replies: 0
• Views: 1,029
10-08-2013, 03:13 AM
42. ### Unsure of which analysis I should use. Hoping for some help!

You will have to forgive me, I’m moderately inexperienced in this, and have been having one of those weeks where I keep questioning myself. I’m...

• Replies: 0
• Views: 907
Eon
10-07-2013, 10:18 PM
43. ### Principle Components, Canonical Variate Analysis and Win-DAS

I'm trying to follow some analysis procedures as presented in an applied microbilogy paper. The authors did a principle components analysis (PCA)...

• Replies: 0
• Views: 1,342
10-07-2013, 03:17 PM
44. ### Help with comparing variability of 3 variables on different scales

Hi, I have 3 socioeconomic variables on different scales (yearly income, job category, and years of education) and I'm interested in determining...

• Replies: 0
• Views: 2,847
10-05-2013, 04:02 PM
45. ### Regression diagnostics on panel data regression

Hey guys. I've not worked much in panel data regression but what I've been thinking about (and not been able to find much information about) is...

• Replies: 0
• Views: 2,796
10-05-2013, 03:30 AM
46. ### Book for Applied Panel Data Analysis

Hello, I am looking for a book with the topic applied panel data analysis. I already had a look on these ones: ANALYZING PANEL DATA (P) This...

• Replies: 0
• Views: 1,232
10-03-2013, 10:43 AM
47. ### Statistics of Rating

In a website, albums are ranked based on users' input. Each user selects some albums to rate, giving each album a whole number between 1 and 10. I...

• Replies: 0
• Views: 1,408
10-02-2013, 08:59 AM
48. ### 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: 1,525
DaH
10-02-2013, 07:57 AM
49. ### sample and gander

Hi all, I have a newbie question I'm doing a small research about the prevalence of smoking in diabetic patient. My sample size is 300. However,...

• Replies: 0
• Views: 1,709
10-02-2013, 12:54 AM
50. ### Analyzing Pooled Likert Data

Hi Everyone, I'm analyzing Likert Survey Responses for a question "How satisfied are you with your Item?" (1 = Very Dissatisfied / 5 = Very...

• Replies: 3
• Views: 1,047
10-01-2013, 08:40 AM
51. ### Risk Averse

A store has enough employees to attend to customers that are flowing into it at an average rate of 25 per hour. Should the store manager be employing...

• Replies: 1
• Views: 1,567
09-30-2013, 01:38 PM
52. ### Hypothsis Testing

In a training center, a new strategy was implemented. After the implementation of this new strategy the training center claimed that on an average...

• Replies: 2
• Views: 1,431
09-30-2013, 01:30 PM
53. ### Promo analysis

Hi everyone, Can you please give a hint on what method I should use to find price anomalies on one market if I have POS data for the entire...

• Replies: 0
• Views: 2,045
09-30-2013, 05:39 AM
54. ### Sturges' Formula

How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

• Replies: 5
• Views: 30,985
09-27-2013, 12:01 PM
55. ### unidimensionality

I have six constructs. Each construct has several items. Before we do structural equation modeling, I want to check unidimensionality and convergent...

• Replies: 0
• Views: 2,063
09-27-2013, 10:13 AM
56. ### Frequency Distribution

Hi all :wave:. I have a question, that is very important for me! :( It is written in book "basic statistics for business and economics" for...

• Replies: 2
• Views: 1,501
BGM
09-27-2013, 07:32 AM
57. ### Unequal sample sizes - one-way ANOVA and MANOVA

Hello everyone:wave:, I know that unequal sample sizes would confound IVs in factorial design. But how about in one way analysis? How and...

• Replies: 0
• Views: 1,713
09-27-2013, 03:51 AM
58. ### Permanova significant four fold interaction. How about 2 and 3 fold interactions?

Dear, I have a problem considering the analysis of a design with 4 factors. I have a fully crossed design with 4 factors (Su,Sp,Sa,Te). When...

• Replies: 5
• Views: 1,733
09-26-2013, 06:09 PM

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