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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: 19,432
10-11-2014, 12:02 PM
1. ### need help for senior thesis/ NCHA data

I am doing a senior thesis. I will be using secondary data from the NCHA. I want to see if there are gender differences in abusive relationships....

• Replies: 3
• Views: 1,660
02-24-2014, 08:23 PM
2. ### Basic question on Spearman's correlation coefficient

Hey guys, If I understand correctly, when calculating Spearman's correlation coefficient you just rank your variables, and then calculate...

• Replies: 5
• Views: 1,364
02-24-2014, 01:37 PM
3. ### 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: 937
02-24-2014, 11:09 AM
4. ### Repeated measures where different cells from the same subject are used?

Hi, I work in a lab where we routinely use people's cells in studies, comparing the effect of different treatments on those cells. We use the cells...

• Replies: 0
• Views: 759
02-24-2014, 10:47 AM
5. ### One Way ANOVA - Dummy Variable and Post-Hoc Questions

Hi Everyone! I am conducting a retrospective research study to determine if a new specific sign of an injury is correlated with more related injuries...

• Replies: 2
• Views: 1,397
02-22-2014, 08:22 PM
6. ### estimated variable as dependent variable get robust standard errors

Hi, I have a problem with the calculation of standard errors when using a dependent variable in a regression model that was previously estimated...

• Replies: 0
• Views: 2,343
02-20-2014, 11:53 AM
7. ### Can anyone explain Poisson regression for doing time trend?

It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

• Replies: 12
• Views: 7,209
02-19-2014, 06:52 PM
8. ### Looking for significance when taking overlap into account

I am currently working on completing my dissertation. I am looking for a way to test for distinct but overlapping phases. I have run ANOVA's and used...

• Replies: 0
• Views: 1,718
02-16-2014, 05:51 PM
9. ### how to initiate statistical research, one dependent variable, many independt

Hi guys For work, I've initiated this project. I've gathered data, now I'm gonna do the analysis. The objective is to find out where we get our...

• Replies: 0
• Views: 1,079
02-14-2014, 06:16 AM
10. ### Measuring Statistical Variances in sum of values over time.

Hi all, I need some help, please. I'm conducting a research analysis on how different high school calendar selections can impact crime rate. ...

• Replies: 0
• Views: 1,063
02-13-2014, 05:56 PM
11. ### Independent Metropolis Hastings, not jumping

I'm trying to sample from a posterior (with 50 dimensions) and I've got a proposal distribution which gives a overall acceptance rate of 0.3. However...

• Replies: 1
• Views: 1,499
02-13-2014, 04:55 PM
12. ### Use variables selected from DISTLM multivariate regressions in CAP

I would like to know if the following analysis strategy is correct conceptually, if it makes sense. I found difference in fish assemblage structure...

• Replies: 0
• Views: 2,289
02-13-2014, 11:41 AM
13. ### Is ANOSIM appropriate for my question?

I'm doing a microbial ecology experiment setup as follows: Six barrels have been filled with different substrates. Water from the environment flows...

• Replies: 0
• Views: 1,196
02-12-2014, 08:15 AM
14. ### Which statistical test to use, 20 subjects, 6 categorical variable, 4 parameter

Hi I have an experiment and are not sure which statistical test I should use. I hope some of you can help me, as this is not my strong side.. I...

• Replies: 6
• Views: 1,726
02-11-2014, 12:57 AM
15. ### Optimization of variables with significantly different standard errors.

Hi everyone! I have some issues related to the title at hand, and hopefully you guys can help. Sorry for the long post. I have forecasted mean...

• Replies: 0
• Views: 1,045
02-10-2014, 01:37 PM
16. ### Intuition about why sample covariance is unbiased (chatbox convo)

02/08 16:04 spunky: quick theoretical check: for sample r to be an unbiased estimate of population rho do we (a) need the assumption of bivaraite...

• Replies: 0
• Views: 1,660
02-08-2014, 11:40 PM
17. ### Mann Whitney help

Hi, I did a small experiment and I had 4 distribuitons. these are not normal distribuitions, that is why my professor told me to run a Man...

• Replies: 3
• Views: 1,812
02-07-2014, 05:14 PM
18. ### Not sure what to do here

I have a research about replacing regular ice cream stabilizer with mango peels. To know how effective these mango peels will be as a new...

• Replies: 0
• Views: 1,015
02-07-2014, 08:43 AM
19. ### How to calculate conditional density

Hi, If we have a bivariate Gaussian dist as N(m, a). m=mean and a=variance. how can we find f(x|y) in terms of m and a? Thanks

• Replies: 1
• Views: 1,296
BGM
02-07-2014, 12:35 AM
20. ### exponential EWMA- statistical process control to monitor time between events

I am looking into control charts to monitor time between events for rare events. A quick literature review revealed that the following four methods...

• Replies: 0
• Views: 1,514
02-06-2014, 04:10 AM
21. ### Need help!!

Im doing my research on groeth response of tomato. And i got the average weekly increment in height T1-34 cm t2- 38 cm t3- 43 cm t4- 48 cm t5-...

• Replies: 1
• Views: 1,447
02-05-2014, 11:53 AM
22. ### Permutations w/ constraints question

Hello Everyone! I apologize, in advance, if I'm posting this query in the wrong thread... My query: Given a transpose 5-d vector, {d_1, d_2,...

• Replies: 0
• Views: 1,121
02-05-2014, 09:30 AM
23. ### correlation method for latent variable

Hi! I have several dichtomous variable which are latent and normally distributed. When I calculate correlation with two of these variables I ought...

• Replies: 0
• Views: 855
02-05-2014, 03:10 AM
24. ### Before/after surgery comparison

Hi! I am currently doing experiments on song birds looking at pre- and post surgery data. I have 10 male birds each singing at least 100 songs both...

• Replies: 7
• Views: 1,488
02-04-2014, 09:20 AM
25. ### Need good, fast stats help, will pay, help on dissertation, inferential analysis ONLY

I need a stats coach to sort out the inferential stats part of my dissertation - that's all. The SPSS file is done, I have 109 "good" pages of the...

• Replies: 77
• Views: 8,771
02-03-2014, 06:18 AM
26. ### 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: 969
02-02-2014, 10:39 AM
27. ### What to do if sample size is too big? (ttest)

So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

• Replies: 5
• Views: 6,466
02-01-2014, 05:47 PM
28. ### sample size ?

I want to take an undertake an experiment for number of elbow fractures in our hospital than what sample size should I take ? there are huge...

• Replies: 1
• Views: 1,461
02-01-2014, 05:38 PM
29. ### Help analyzing bird migration patterns?

Hi. I am trying to analyze data I have on bird migration and am stuck on what I need to do. Basically, I have the maximum abundance of birds seen...

• Replies: 0
• Views: 856
01-29-2014, 09:50 AM
30. ### 1 group of subjects, two tests

Hi all. I'm a bit confused at the moment, so I'm hoping anyone here can give me a hand :) I've completed a large data collection, using 9...

• Replies: 2
• Views: 1,208
01-29-2014, 09:06 AM
31. ### Multiple Paired t-tests

Hi, I'm having a little bit of trouble with some research I'm doing and wondered if anyone could help. I'm looking at political decision-making....

• Replies: 3
• Views: 1,951
01-28-2014, 03:50 PM
32. ### Cross sectional T-test, event-study

Hello, I'm new to the forum and I have tried searching for it but couldn't quite find my solution. I'm working on a paper involving an Event study...

• Replies: 0
• Views: 5,450
01-27-2014, 07:09 PM
33. ### Analysis of a matched case-control study

Please, i need help on my analysis. It is a 1-1 matched case-control studies. I am willing to pay for the guidance. My deadline is friday.

• Replies: 11
• Views: 3,153
01-27-2014, 10:17 AM
34. ### Help!!!!!

• Replies: 2
• Views: 1,637
01-27-2014, 09:23 AM
35. ### How to test this research model? With SEM?

Hey, I am currently writing my master thesis and have gathered all the necessary data and complete my model. 1) Institutional dimension...

• Replies: 1
• Views: 1,461
01-26-2014, 05:45 PM
36. ### Appropriate analyses for social psychological study of relationships

Hi, I collected cross-sectional data on personality and attitude variables for a social psychology research project and now I will be doing the...

• Replies: 0
• Views: 761
01-26-2014, 02:05 PM
37. ### representative sample

Hello everyone, I need your help yo determine if both examples are representative samples or not : First example : A liberal commentator on a...

• Replies: 1
• Views: 1,237
01-24-2014, 09:31 PM
38. ### URGENT: Two-Way Anova or Regression

Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

• Replies: 3
• Views: 1,217
01-24-2014, 01:47 PM
39. ### Chi Square for Likert Scale in Single Sample

Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

• Replies: 3
• Views: 10,283
01-23-2014, 10:18 AM
40. ### quantifying impact of variable through variation

Hi all, I have a problem im trying to solve and I was hoping for some guidance on the approach. I have converted the real life problem to an easy to...

• Replies: 0
• Views: 868
01-23-2014, 07:01 AM
41. ### Comparing Data from Value-Based Scales with Frequency-Based Scales

I was recently asked to correlate scores between two surveys that supposedly measure similar constructs. One has a value-based scale (very like me,...

• Replies: 0
• Views: 1,587
01-22-2014, 02:36 PM
42. ### Help would be much appreciated

Hi, I am currently trying to piece together my first research proposal for an MSc module. If anybody could please help it would be much...

• Replies: 1
• Views: 1,310
01-21-2014, 12:52 PM
43. ### Introduction to Estimation(need help with terms)

Which of the following definitions is incorrect? Estimation It is a process by which sample data is used to estimate or approximate the value...

• Replies: 2
• Views: 1,443
01-20-2014, 11:36 AM
44. ### Time Series Forecast

I have a time series data of hourly consumption of electricity for 720 data points and I want to make a forecast for 25 time points after the 720th...

• Replies: 0
• Views: 1,202
01-20-2014, 11:23 AM
45. ### Smearing Transformation

I've found several papers on the smearing transformation for ln(x). However, I"m curious if there is one for ln\frac{x}{1-x}. I can't find...

• Replies: 3
• Views: 1,487
01-20-2014, 02:04 AM
46. ### Spearman's rho or Pearson's r

Dear all, For my master thesis I held a survey. For the sake of simplicity let's say part A asks people to rate a job offer on ten job features...

• Replies: 0
• Views: 1,575
01-19-2014, 07:12 AM
47. ### dependent correlations significance test

Hi all, I have a test score with which I want to explain another test difference score (post-pre), under 4 conditions. All conditions are...

• Replies: 0
• Views: 1,493
01-19-2014, 03:29 AM
48. ### 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: 953
01-18-2014, 11:59 AM
49. ### comparing means

Hi All, I would like to ask a question about compare mean to answer the research question. i have 2 scales to measure anxiety situation, first...

• Replies: 0
• Views: 2,013
01-18-2014, 09:50 AM
50. ### Does the NSA random number generator backdoor affect statistical random nummbers?

Hello, in my computer magazine I read 1 month ago, that the NSA has inserted a backdoor in the random number generating circuit on Intel...

• Replies: 1
• Views: 2,224
01-17-2014, 06:29 PM
51. ### Analyse unemployment rate and public expenditure on active labour market policies?

Hello everyone, I have a data set of OECD. I would like to analyse the relation between this two indicators: the relation between unemployment rate...

• Replies: 0
• Views: 1,283
01-17-2014, 01:12 PM
52. ### Statistical Tool Fit Comparison

Goodevening! My group is currently in the proposal stage of our thesis about species composition and species abundance. We are at loss as to what...

• Replies: 0
• Views: 1,271
01-17-2014, 10:45 AM
53. ### 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: 3,874
01-16-2014, 02:29 PM
54. ### Rotation in Principal Components Analysis

Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

• Replies: 7
• Views: 5,789
01-14-2014, 08:18 AM
55. ### No Standard Deviation

Hello statistical geniuses, I have 450 items and I want to test a sample and be sure with 95% confidence that if all of my tested items are...

• Replies: 5
• Views: 1,927
01-13-2014, 04:00 PM
56. ### Four Factor Design ~ Homoscedasticity Problem

Hello! For school, I have decided to do a project on airline reliability; specifically, looking at on-time departures. I decided to use a four...

• Replies: 0
• Views: 1,534
01-12-2014, 08:20 PM

Hi all My data is as follows: I have seedling height divided <10 cm and >10cm I collected data across a glacier foreland using square plots. Each...

• Replies: 0
• Views: 874
01-12-2014, 04:42 PM
58. ### Covariance structure in a longitudinal study

Hi We are conducting a pharmacological trial with repeated measurements of the drug concentration in the blood over several weeks. Due to the...

• Replies: 0
• Views: 2,119
MBJ
01-10-2014, 05:30 AM

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