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Threads 961 to 1020 of 3209

# 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: 19,431
10-11-2014, 12:02 PM
1. ### Need advice regarding Factor analysis for questionnaire design

Hi! I would greatly apreciate some advice on selecting an appropriate form of factor analysis. Im writing a paper that introduces a new...

• Replies: 0
• Views: 1,848
05-22-2014, 07:20 AM
2. ### Kappa coefficient for repeated measures

Hi Everyone, I know that a kappa coefficient for repeated measures exists, but I didn't find the article in free access (Kraemer HC. Extensions of...

• Replies: 0
• Views: 2,587
05-22-2014, 04:59 AM
3. ### Advice on appropriate statistical test

I have 4 groups who provided scores and am interested in comparing the scores between groups to determine if they are significantly different. The...

• Replies: 2
• Views: 1,381
05-21-2014, 09:01 AM

Hi everyone! I have a quick question to ask and quite frankly im slightly confused (maybe because ive over complicated everything in my...

• Replies: 2
• Views: 1,658
05-19-2014, 12:18 PM
5. ### Planned 3x2 Factorial Design - PROBLEM!

Hi, I'm looking at crop yield in relation to nitrogen supply and chilling duration. My original experimental design was to have two IVs, the...

• Replies: 1
• Views: 1,905
05-19-2014, 11:54 AM
6. ### Making sense of the data...Data analysis

Dear Experts, I have data for a 12 months study done on 2 wastewater (Plant A and Plant B—Final Effluent and Discharge Point) treatment plants....

• Replies: 1
• Views: 1,219
05-18-2014, 02:46 PM
7. ### MS Thesis Topic Recommendations from Journals concentrating on Parametric Tests

I would like to know if you can recommend sites where journals, particularly statistical researches, can be viewed completely. Alternatively, can you...

• Replies: 0
• Views: 1,330
05-17-2014, 10:24 PM
8. ### Is MANOVA the correct way?

Hi all, In my research, I have values for 7 (+ 1 for reference) devices that measured the (walking) steps at the same time (so that I would be...

• Replies: 0
• Views: 1,327
05-17-2014, 05:25 AM
9. ### Statistical Significance - Comparing subpopulations to populations

I have a bit of an exploratory question that I would like an answer to if possible. I'm taking a sample of a sub-population (say, Colorado) and...

• Replies: 1
• Views: 1,258
05-15-2014, 04:12 PM
10. ### ROC curve induced madness

Calling all fellow egg heads I’m getting obsessed with ROC curves. Why is the horizontal axis of specificity flipped to 1 – specificity (false...

• Replies: 1
• Views: 1,482
05-14-2014, 10:57 AM
11. ### Fixed/Random Effects model v. OLS Regression with dummies

Hello everyone! :wave: I have three consecutive waves of panel data with which I will be estimating incomes based on the Mincer equation. I have...

• Replies: 2
• Views: 1,940
05-13-2014, 10:49 PM
12. ### Convert SD and confidence intervals

Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

• Replies: 0
• Views: 1,510
05-12-2014, 11:32 AM
13. ### Correlation of two dependent variables

Hi all! I have a small data set which contains two tissue samples from ~20 patients. Each patient has contributed a tissue sample from left and...

• Replies: 0
• Views: 2,338
05-09-2014, 01:26 AM
14. ### How to interpret Spearman's correlation between Likert-scale questions?

Hi there! I have a question regarding the correlation of different statements. I would appreciate any help! How can I interpret this correlation?...

• Replies: 0
• Views: 2,713
05-08-2014, 05:07 PM
15. ### ANOVA or MANOVA

Hi, I have a question on which statistical test to use for 2 separate problems: 1) I have 4 different groups, 1A, 1B, 2A and 2C and have 3...

• Replies: 1
• Views: 2,019
05-07-2014, 05:41 AM
16. ### Which analysis fits this research?

Hi everyone! Apparently, evertbody in the forum seems to have quite some knowledge already, while I am only posting a rather easy questoin. I...

• Replies: 0
• Views: 1,244
05-07-2014, 03:05 AM
17. ### New to the group-Need suggestion to analyse the data

I have a database: Interstate ADT(avg daily traffic) IRL 1yrRL 2ndyrRL...5thyrRL I-95 15000-25000 (800) (750) (650) (340) ...

• Replies: 1
• Views: 1,519
05-05-2014, 12:23 PM
18. ### Rsearch Design

Hi, I am currently writing my dissertation. My lecturer told me my research design is repeated measure with multiple groups, however she is...

• Replies: 1
• Views: 1,405
05-04-2014, 04:10 PM
19. ### composite variables

Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

• Replies: 1
• Views: 1,278
05-03-2014, 03:55 PM

I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

• Replies: 8
• Views: 3,287
05-02-2014, 05:10 PM
21. ### Balancing data

A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

• Replies: 3
• Views: 1,142
05-02-2014, 01:18 PM
22. ### Matched Cohort (using 2 different matching methods)

I have a question about whether something could be considered acceptable or not (I have feeling I really shouldn't do this but I do not have tons of...

• Replies: 0
• Views: 1,825
05-02-2014, 06:38 AM
23. ### meta-analysis combined p-value from different tests

I want to examine whether the students of School A have done significantly better than the students of School B in science subjects. In Math, School...

• Replies: 0
• Views: 1,858
05-01-2014, 12:38 PM
24. ### 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: 973
05-01-2014, 12:36 PM
25. ### Can I compare regression results with principal component analysis(PCA)

I'm trying to analyze survey data ( 31 response data, and 5 variables, dependent variable is non-parametric (distribution free)). I tried to use...

• Replies: 2
• Views: 1,947
05-01-2014, 07:28 AM
26. ### SEM: How to Label path diagram and translate it into Equations

Hei hou I'm new here. So hello everybody. I have a problem. It's about SEM (structural equation model). I have to lable a path diagram...

• Replies: 4
• Views: 1,324
04-30-2014, 07:03 PM
27. ### ROC plotting

I am a true novice of statistics, so would be grateful of easy explanations, as I am trying to create an ROC curve, and understand how to do it...

• Replies: 2
• Views: 1,418
04-30-2014, 06:58 PM
28. ### observed number & expected number

I did a chi-square analysis. Could you kindly answer the following question? My observed number is the same as my expected number. How can I...

• Replies: 0
• Views: 1,341
04-30-2014, 03:25 PM
29. ### GLM on bimodal Data possible?

Hello, I've got data, in which the target variable is bimodally distributed. The target variable is also bimodally distributed conditional on the...

• Replies: 0
• Views: 2,591
04-29-2014, 03:57 PM
30. ### Mathematical formulation of algorithms

Hello, I am working with ecological time series data (15 minutes interval = 96 measurements / day), i.e. measurements of tree stem dimension...

• Replies: 1
• Views: 1,767
04-29-2014, 11:22 AM
31. ### Analyzing 311 Calls trend

For an assignment, I am analyzing 311 call trends. I have downloaded the total number of 311 calls made in my city per month for the last five years...

• Replies: 3
• Views: 1,545
04-28-2014, 03:55 PM
32. ### Research about stock comovements due to similar ticker symbols

Dear all, I have a small question about a small research that I wanted to do regarding stock symbol similarities and their abnormal returns. I...

• Replies: 7
• Views: 1,895
04-26-2014, 07:31 PM
33. ### obtaining an unbiased estimator for the min: x_(1)

How would I go about finding an unbiased estimator for the minimum order statistic for a given PDF and distribution. Example: ...

• Replies: 4
• Views: 1,367
04-25-2014, 10:30 AM
34. ### Statistical Hypothesis - (help needed)

hi Pro :) can someone help me out with below questions? Question 1: A report prepared by the Economic Research Department of a bank has...

• Replies: 0
• Views: 1,230
04-25-2014, 02:15 AM
35. ### Multivariate Normality

I have a data set I am going to use SEM on. Each of the variables seems to have acceptable skewness and kurtosis (using cutoffs of 3 and 10 on...

• Replies: 2
• Views: 5,455
CTB
04-25-2014, 01:03 AM
36. ### multiple paired t-test or repeated measures ANOVA

Hello, I have the following problem: I want to compare different things for people with a foot problem and I measured comparable things for...

• Replies: 0
• Views: 1,081
04-24-2014, 04:55 AM
37. ### Meta Analysis Question: Is this even possible?

Here's the situation: a colleague has a stats consultant who is saying the following type of meta-analysis is possible. He has replicated a study...

• Replies: 4
• Views: 1,329
04-23-2014, 08:56 PM
38. ### How do I define this research design?

This is a fairly straightforward question but I can't seem to find a good definition to categorize some review board paperwork I need to do. ...

• Replies: 1
• Views: 1,085
04-22-2014, 08:52 PM
39. ### model selection - keeping binned and continous version of variables in same model

Hello, I have a dataset of about 160,000 observations and I'm trying to build a binary classifier. Lets call my variable to be classified Y and my...

• Replies: 1
• Views: 1,112
04-22-2014, 09:49 AM
40. ### Choosing the best combination

I am conducting a research where I am trying to separate heart and lung sounds using wavelet analysis. In this research I have to use different...

• Replies: 0
• Views: 850
04-22-2014, 12:56 AM
41. ### Measurement error and correlation coefficients: a social-sciency approach...

hello everyone! yesterday's chat on measurement error and regression made me think that it would be nice to demonstrate (from a social-science-like...

• Replies: 0
• Views: 1,972
04-19-2014, 06:44 PM
42. ### 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my...

• Replies: 0
• Views: 4,223
04-19-2014, 07:25 AM
43. ### VAR model definition

Edit: Question Answered. Instead, could you please tell me how can I delete a topic once I post it, if that's possible. Cheers Greetings, I have...

• Replies: 0
• Views: 1,292
04-18-2014, 09:56 AM
44. ### 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: 920
04-17-2014, 10:23 AM
45. ### if weighted average is too small

I have a metric in % and another column with the Number of accounts for each row. I created a weighted average using rhe 5 metric and the number of...

• Replies: 0
• Views: 1,030
04-15-2014, 12:40 PM
46. ### posthoc test for a within-subject factor

I am doing MANOVA. I have a within-subject factor "fatigue". One variable is fatigue (baseline, fatigue, rest). One of the dependent variables is the...

• Replies: 0
• Views: 988
04-15-2014, 09:51 AM
47. ### one sample t-test alternative

Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

• Replies: 13
• Views: 2,363
04-10-2014, 07:08 AM
48. ### Which one should I trust : shapiro test or qq plot?

Good evening everyone, Sorry if this question already exist, I searched but didn't find an asnwer. I am using 7-points likert scale for my...

• Replies: 3
• Views: 2,014
04-09-2014, 05:02 PM
49. ### Model Verification: Verification of Environmental Dispersion Model

I am working with an environmental dispersion model, that I am trying to verify with measured data. We have a six receptors (measurement stations) in...

• Replies: 0
• Views: 1,622
04-09-2014, 03:24 PM
50. ### Picking the correct test, need help urgently!

Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

• Replies: 3
• Views: 1,232
04-09-2014, 12:35 PM
51. ### Appropriate statistics where dataset contains only positive cases?

Sorry if this sounds confusing or uses the wrong terminology, I'll do my best to explain. I have a data set of approximately 100 records, where...

• Replies: 4
• Views: 1,925
04-08-2014, 02:51 PM
52. ### structuring a proof

I am working on a problem to show that the non central f distribution is a generalization of the f distribution. I understand this conceptually but...

• Replies: 5
• Views: 1,835
04-08-2014, 10:12 AM
53. ### Research process

Question 1: A researcher assumes that there is a correlation between the happiness of people and the welfare of the state they live in. How would...

• Replies: 1
• Views: 1,426
04-08-2014, 08:28 AM
54. ### Student's T-test versus one-way ANOVA

I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

• Replies: 1
• Views: 3,340
04-06-2014, 09:45 AM
55. ### Trend index

Hi I am looking for an index to understand if the trend of the distribution of a single variable is positive or negative and how quick is...

• Replies: 2
• Views: 1,727
04-06-2014, 05:29 AM

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