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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: 18,616
10-11-2014, 12:02 PM
1. ### Maximum Likelihood Estimator for a Transformed Uniorm Distribution

Hello, I have got a transformed uniform distribution. The distribution is of the form: v= u^w Where u: uniform distributed variable w:...

• Replies: 0
• Views: 925
02-23-2015, 06:21 AM
2. ### 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: 925
01-24-2016, 10:34 PM
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: 924
11-09-2013, 09:53 PM
4. ### Research statistical analyses

I have created my dissertation project ' The effect of eye gaze on the recognition of emotional expression in children with autistic spectrum...

• Replies: 0
• Views: 923
04-16-2013, 04:37 AM
5. ### Need your help on my research study!

Hi everyone! I am am currently having a qualitative study and have finished conducting interviews with participants. Despite qualitative in nature,...

• Replies: 0
• Views: 923
06-18-2015, 01:40 PM

I have two questionnaires I want to correlate. One questionnaire has all the questions with answers from 1 to 5, I can make a mean out of that...

• Replies: 2
• Views: 923
11-17-2015, 06:09 AM
7. ### Application of statistics for sample of a population (Urban Renewal)?

I am bachelors student working on a report regarding Urban renewal. I am given a certain area to study. Study area include the socioeconomic aspects...

• Replies: 1
• Views: 922
04-04-2013, 05:04 AM
8. ### clasiffy - weka

can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

• Replies: 0
• Views: 922
03-12-2017, 04:33 PM
9. ### MANOVA vs. Chi-squared

So I am running an experiment where I am interested in the proportion of time spent doing certain behaviors under different treatments. I know...

• Replies: 0
• Views: 921
02-24-2015, 07:55 PM
10. ### Help assessing convergence across categorical responses

Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

• Replies: 0
• Views: 920
03-05-2015, 11:07 AM
11. ### 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: 920
05-17-2016, 09:50 AM
12. ### Transformation

Let us have variable X (it is skin conductance level) that has a great interindividual variability in "baseline" due to which all between subject...

• Replies: 0
• Views: 919
11-15-2013, 04:47 PM
13. ### 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: 919
03-27-2015, 02:06 PM
14. ### Is there any effect if i change the column value in Minitab Taguchi DOE design??

Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors....

• Replies: 0
• Views: 915
08-30-2013, 11:57 AM
15. ### methods for selection a subset of population to measure biomarkers

Hi! In a quite large time-to-event clinical trial project, the population is very large (more than 1,000 people). I want to measure the subjects'...

• Replies: 1
• Views: 914
07-20-2015, 03:09 PM
16. ### Sampling from Tweets or Tweet Users

Dear All, We would lile to do Twitter Analysis and want to read tweets for certain topic to decide wheter they are positive,negative or neutral ....

• Replies: 1
• Views: 913
07-08-2013, 03:33 AM
17. ### Variance of combined clusters

During the process of cluster analysis, when two clusters with estimated variance {s}_{1}^{2} and {s}_{2}^{2} what is the estimated variance of the...

• Replies: 0
• Views: 912
03-20-2012, 12:44 AM
18. ### Mix of surveys

Hello everyone, I have a very limited experience in online research and if you have 1 minute to help me, I will be grateful. Every day I build...

• Replies: 1
• Views: 912
04-29-2013, 11:05 AM
19. ### Correlation interpretation: when to use "is related"?

If the selling of ice cream was found correlated (0.4-0.6) to the temperature, can we conclude that ice cream selling "is related" to the...

• Replies: 0
• Views: 912
03-19-2014, 10:03 AM
20. ### Help for Statistical Analysis for our project (using Statistical Estimation)

Good day. I would like to ask for your help for our statistical analysis of our project. Our project is an alarm clock that is modified in a way that...

• Replies: 1
• Views: 909
02-25-2014, 08:23 AM
21. ### 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
22. ### Any difference between online and newspaper advertisement on books selling?

An owner of 2 bookstores B1 and B2 used 2 ways for new books advertisement. B1 advertised online, while B2 advertised in newspapers. The owner wants...

• Replies: 0
• Views: 901
03-06-2014, 08:03 AM
23. ### 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: 901
05-16-2015, 05:35 AM
24. ### 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: 901
04-18-2016, 07:01 AM
25. ### ANOVA with post hoc

Would this study design be sufficient? I would like to study the efficacy of countermeasure versus a polygraph: Use 30 polygraph operators, 10 of...

• Replies: 0
• Views: 898
01-11-2015, 07:37 AM
26. ### Retired Statistician Selling My SAGE Statistical Reference Book Series - 25 Books !!

Dear Fellow Statisticians, I hope this will be considered and appropriate post by the Admins. I'm a retired life-long Statistician and...

• Replies: 1
• Views: 897
03-16-2014, 09:20 PM
27. ### What counts as a high dimensional problem in sequential importance sampling?

I've read a lot about how sequential importance sampling isn't useful in high dimensions, but not what is considered high. The reason for me...

• Replies: 0
• Views: 897
03-18-2014, 12:11 PM

Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate...

• Replies: 0
• Views: 895
11-29-2012, 07:39 PM
29. ### multivar normal distribution

Hi, I have X, Y and Z that have N distribution and I got the E(X|Y) and E(X|Z) using the bivariate rules, but for E(X|Y,Z) I don't know how to...

• Replies: 1
• Views: 893
07-15-2013, 11:24 AM
30. ### Literature regarding Multinomial Logit Regression

Hello, I am looking for helpful links and literature regarding the logit regression with a multinomial target variable aka multinomial GLM. ...

• Replies: 0
• Views: 891
02-12-2015, 08:06 AM
31. ### Statistical tests for the analysis of acoustic parameters of one speaker

Hello! I would like to address the question regarding the statistics. I am analyzing the relation between the narrow focus and fundamental...

• Replies: 0
• Views: 890
08-26-2015, 05:38 AM
32. ### 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: 890
04-19-2016, 04:24 PM
33. ### Selecting of statistical test?

I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

• Replies: 0
• Views: 890
04-01-2017, 03:20 AM
34. ### Identifying the better "performers" in groups of uneven population

Hello. If the answer to this question is out there, the internet has hidden it pretty well... I've got 5 groups, each with a different...

• Replies: 1
• Views: 889
12-04-2012, 04:29 PM
35. ### Using CAPM as an underlying model to find anomalies in data

I have data on returns for a certain type of stock (we shall call it class A) for several markets, market return data and the risk free rates over...

• Replies: 0
• Views: 889
05-01-2014, 12:36 PM
36. ### 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
37. ### How to compare whether younger patients have better therapeutic results ?

Hi, I've just finished a research on 30 patients. Age range was 26 to 80. I've tested everyone of them before and after the treatment. Results are...

• Replies: 1
• Views: 884
12-19-2015, 10:07 AM
38. ### Calculate CI for Var of sum of normally dist variables?

Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

• Replies: 0
• Views: 881
02-02-2014, 10:39 AM
39. ### Suggestions for Statistical Methods for Health Research

I am currently planning a research project looking at a scoring system for patients (using demographics, social circumstances) to determine whether...

• Replies: 0
• Views: 880
01-18-2014, 11:59 AM
40. ### 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: 878
Eon
10-07-2013, 10:18 PM
41. ### 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: 876
12-19-2015, 04:01 PM
42. ### split-split plot with continuous subplot variable

Hello I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear...

• Replies: 1
• Views: 875
szm
08-26-2016, 06:44 AM
43. ### within-subject factor

RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

• Replies: 0
• Views: 871
04-17-2014, 10:23 AM
44. ### How to analyze change in performance

Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

• Replies: 2
• Views: 871
04-28-2017, 12:11 PM
45. ### Does autocorrelation in data affect (simple) correlation measures?

Hello everyone, I have a question concerning autocorrelation in data affecting correlation coefficients. I have a time series of stock returns...

• Replies: 0
• Views: 870
06-04-2015, 10:35 AM
46. ### Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

• Replies: 0
• Views: 869
07-25-2016, 08:35 AM
47. ### Appropriate sample size for unusual "populations"

There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

• Replies: 2
• Views: 869
08-16-2016, 08:22 PM
48. ### Within Subjects Analyses Advice

Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

• Replies: 0
• Views: 868
06-01-2017, 07:12 PM
49. ### compare a non ranked list to a ranked list

Hi, I need to compare a small list of genes (genes of interests) to a big ranked list of genes (9000) where the 1st one is shown to have an effect...

• Replies: 2
• Views: 867
02-24-2014, 11:09 AM
50. ### Computing ICCs

Hi everyone, Have run into a problem that has me absolutely stumped and would appreciate some assistance. I'm attempting to compute the ICC from...

• Replies: 0
• Views: 865
06-29-2015, 03:36 PM
51. ### Research Project Pseudoreplication Problem

Hello, I posted a few weeks ago but some new problems have come up and I could really use some advice! I am joining in on a research project in...

• Replies: 1
• Views: 861
06-03-2015, 03:12 AM
52. ### Best Stat Question Ever?

Got this off Twitter (@galka_max) and found it interesting: If you choose an answer to this question at random, what is the chance you will get it...

• Replies: 8
• Views: 859
09-06-2017, 01:14 AM
53. ### 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: 858
05-21-2016, 11:45 AM
54. ### 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: 857
04-17-2016, 04:46 AM
55. ### Identifying the right way to establish correlations between different topics

I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

• Replies: 0
• Views: 854
07-02-2016, 03:56 AM
56. ### 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: 850
11-23-2015, 05:57 AM
57. ### Dealing with censored dates as regressors

I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

• Replies: 2
• Views: 849
nbi
04-13-2017, 11:31 AM
58. ### Unbalanced designs in PERMANOVA and Resampling Methods

Dear all, I am a new member here, working mainly in Ecology. I hope this is the right section to ask my question. I am dealing with unbalanced...

• Replies: 0
• Views: 845
05-11-2017, 07:16 AM
59. ### Help Please - Multi-Dimensional Interpolation Analysis

Hi all, I am currently working on a problem that involves a lot of statistics and probability. Unfortunately I have limit expertise in both these...

• Replies: 0
• Views: 841
12-06-2013, 12:47 PM
60. ### Random Sampling - Missing Something Easy and I know it

Hello everyone, I was asked to look over some data that came across my desk and I was stumped as to why it came out the way that it did. So the...

• Replies: 12
• Views: 840
07-25-2017, 11:21 AM

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