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Threads 781 to 840 of 3193

# 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: 18,756
10-11-2014, 12:02 PM
1. ### A Non parametric equivelent to mixed anova?

Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

• Replies: 1
• Views: 5,118
08-14-2010, 09:36 AM
2. ### Good Book on Mathematical Statistics

I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

• Replies: 9
• Views: 2,723
09-17-2014, 07:09 AM
3. ### Help with research

I will start by saying statistics is not my strong point so any help is greatly appreciated. I would like advice on methods to analyze the data I...

• Replies: 1
• Views: 1,071
04-07-2013, 04:22 PM
4. ### How to correct negative skew

My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

• Replies: 2
• Views: 8,152
07-23-2010, 05:03 PM
5. ### Transforming data

Hi, I did General linear model using SPSS and i do not have homogeneity of variances, How i can solve this problem? DO i need to transformmy...

• Replies: 0
• Views: 1,321
01-30-2015, 06:37 PM
6. ### Question about correlation and regression using entire ppopulation

Hi, I am working on a project were I am doing an analysis on the relationship between two metric variables on a county level in the United States....

• Replies: 1
• Views: 1,595
10-30-2011, 06:35 PM
7. ### 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: 1,421
11-01-2013, 08:27 AM
8. ### 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: 3,396
10-30-2013, 11:13 AM
9. ### What statistic to use?

I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

• Replies: 1
• Views: 3,436
04-28-2009, 01:13 AM
10. ### Quasi-experiments and variable manipulation

Hello, I am new here so forgive me if I seem amateur, After doing a lot of research and discussion with other students I have continued to find...

• Replies: 0
• Views: 1,254
09-08-2016, 12:25 AM
11. ### Two Variables, Many Components :( Type 1 Error?

Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

• Replies: 0
• Views: 2,671
03-28-2009, 09:11 AM
12. ### dealing with unequal sample sizes... can anyone help please?

Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

• Replies: 7
• Views: 2,523
11-18-2014, 04:14 AM
13. ### McNemar's test post-hoc power analysis problem when odds ratio=0

I need to do post-hoc power analysis for a McNemar's test (using G*power), and am having trouble getting results. One of the discordant pairs is 0,...

• Replies: 1
• Views: 2,287
02-04-2015, 01:13 PM
14. ### 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: 1,300
03-29-2015, 05:57 AM
15. ### Threshold Autoregressive (TAR) Model with exogenous variables (TARX)

Anyone have experience with these models? From what I remember about VAR is that adding exogenous variables to model a VARX is straightforward....

• Replies: 0
• Views: 793
05-02-2016, 07:42 PM
16. ### EM algorithm

Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

• Replies: 0
• Views: 3,592
04-09-2006, 03:44 PM
17. ### Help needed with choice of appropriate method for repeated measures data

Hello! I'm new on this forum and I'm desperately searching for advice on analyzing my data. I'm currently working on my master's thesis and I'm...

• Replies: 0
• Views: 1,506
08-02-2011, 04:35 AM
18. ### Linear Mixed Models in SPSS for repeated measures

I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

• Replies: 13
• Views: 12,669
08-08-2011, 04:38 AM
19. ### kappa intra observer error test on ordinal

hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

• Replies: 3
• Views: 4,405
09-11-2012, 12:23 PM
20. ### chi-square assumptions with survey data

Hi guys, I've been asked to run some analyses on some survey data and since it's been a long time since i ran one, I just wanted to check I'm not...

• Replies: 1
• Views: 2,879
03-10-2011, 02:10 AM
21. ### MANOVA and MANCOVA - Help needed

I have collected data with one Independent Variable (two levels - nominal) and 4 dependent variables (all scale - continuous). I decided to do a...

• Replies: 0
• Views: 2,402
01-01-2017, 05:29 PM
22. ### Justification for Levene's test?

Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

• Replies: 7
• Views: 3,061
11-28-2012, 06:27 AM
23. ### BLUP of a specific difference is biased

Can anyone explain how BLUPs can be unbiased but the BLUP of of a difference is biased. I have found this statement in numerous papers eg Smith,...

• Replies: 1
• Views: 1,192
09-05-2013, 04:32 AM
24. ### Can I perform logistical regression on a sample of 28

Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

• Replies: 1
• Views: 1,497
02-07-2012, 11:48 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: 1,599
05-19-2014, 12:18 PM
26. ### HMLR and ANOVAs instead of structural equation modelling

Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

• Replies: 0
• Views: 602
06-06-2017, 03:15 PM
27. ### Analysis for different data scales

Hello everyone. I have a question that how can I perform regression/correlation or hypotheses testing on a data which has different response...

• Replies: 0
• Views: 312
07-19-2017, 09:17 AM
28. ### ANOVA help? :)

Basically i have two sets of data collected from two different locations. I know that both sets of data are not normally distributed, so they will...

• Replies: 5
• Views: 1,129
02-13-2013, 05:32 PM
29. ### Data collection

Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

• Replies: 0
• Views: 983
08-05-2013, 11:39 PM
30. ### Reporting effect size/post hocs when not significant- rigorous alpha

Hello, I have received my manuscript back from reviewers who have suggested that I report Cohen's d for differences found between three groups. ...

• Replies: 1
• Views: 1,125
08-01-2016, 08:08 AM

Hi, im new to this forum and i am a psychology student who is in the middle of my dissertation and it has reached the point that i need to start my...

• Replies: 1
• Views: 1,631
03-25-2009, 11:08 PM
32. ### Determining which data set is most like another

I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

• Replies: 6
• Views: 1,757
04-27-2012, 02:08 PM
33. ### How many tests?

Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

• Replies: 1
• Views: 1,124
08-06-2014, 09:10 AM
34. ### Paired Vs unpaired t-test - which one to use?

Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

• Replies: 1
• Views: 2,784
08-18-2014, 07:12 AM
35. ### which distribution fits...

Hi I am working on some data describing people arrival at the bus station. For example 08.00-08.10 at the station arrived 9 people/min...

• Replies: 2
• Views: 1,706
BGM
07-15-2011, 11:06 AM
36. ### Public Transport Model

Hi. I am working on statistical model about people waiting time for city bus. Actually I cannot count all people who go in and out from bus in...

• Replies: 0
• Views: 1,789
07-26-2011, 11:46 AM
37. ### Markov Processes

How to proof that in every markov process time between 2 arrivals is exponential ? best regards

• Replies: 0
• Views: 1,623
08-08-2011, 12:49 AM
38. ### Hypothesis about bus arrivals distribution

Hi I have collected data in the bus stop registering bus arrival times. Now I want to find the distribution that fits to this data. Trying in...

• Replies: 1
• Views: 2,197
01-20-2012, 03:52 PM
39. ### Normal distribution...

Hi. In many examples I have seen that service time for passengers (time between 2 bus arrivals) is modeled by using normal distribution. As usually...

• Replies: 0
• Views: 1,642
04-03-2012, 04:32 AM
40. ### How to calculate test reliability with different exam versions

Hello All, I'm new to this forum and this is my first questions. We have 1500 students and each student will receive a test that has 30...

• Replies: 0
• Views: 1,313
04-12-2013, 04:16 PM
41. ### Scientific articles about statistics

I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

• Replies: 2
• Views: 2,763
03-14-2013, 03:49 PM
42. ### P-value plots

If anyone know any good paper or other resource that gives an introduction to p-value plots, I'd greatly appreciate if you could share it.

• Replies: 2
• Views: 1,575
04-25-2013, 01:51 AM
43. ### I.I.D assumption of T-test

I am writing my second master's thesis now and I came across a situation where V\neq{V}. So I thought I'd test whether this need to be the case in...

• Replies: 10
• Views: 3,680
01-16-2014, 02:29 PM
44. ### 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: 1,090
05-02-2014, 01:18 PM
45. ### 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: 1,228
10-18-2013, 12:46 PM
46. ### ANOVA with subject id's as variables?

Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

• Replies: 6
• Views: 2,557
03-27-2012, 04:01 PM
47. ### Contradictory Results re. Normality Tests

Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

• Replies: 15
• Views: 9,982
06-13-2011, 03:43 PM
48. ### 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: 904
Eon
10-07-2013, 10:18 PM
49. ### sample size calculation with ratings/instances nested within each subject

Hi, As a brief background, each subject is rating all his/her activities within the day (called instances). I want to calculate the sample size...

• Replies: 0
• Views: 839
07-21-2014, 02:00 AM
50. ### Interval Level

Could anybody help with game theory in accordance to penetrating a market? Thank you for your answers!

• Replies: 1
• Views: 2,889
10-08-2008, 02:11 PM
51. ### Gage R&R results to usable data

This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

• Replies: 1
• Views: 1,269
09-12-2016, 04:21 AM
52. ### Correct test to use for research design

Hi All, would like some opinions on the correct test to use for a pretty straight forward design: I want to examine how the effect of X on Y differs...

• Replies: 2
• Views: 1,268
09-21-2013, 10:49 AM
53. ### 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: 2,946
10-30-2013, 08:44 AM
54. ### Cross-estimating the independent variables to exclude outliers

I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

• Replies: 0
• Views: 5,613
03-08-2014, 08:49 AM
55. ### RMSEA manually

Hello, I'm working with the trial version of a software that does not allow me to calculate the RMSEA for my CFA. Could I calculate this manually?...

• Replies: 0
• Views: 1,506
02-13-2017, 04:50 AM
56. ### Dissertation statistics

Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

• Replies: 0
• Views: 1,907
07-13-2009, 05:21 AM
57. ### Exogenous and Endogenous Variables

How can you identify exogenous and endogenous variables from a chart that uses arrows and slings?

• Replies: 1
• Views: 4,230
02-12-2010, 03:17 AM

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