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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread 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...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 19,432
    10-11-2014, 12:02 PM Go to last post
  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....

    Started by futureJDstudent‎, 02-24-2014 06:52 PM
    • Replies: 3
    • Views: 1,660
    02-24-2014, 08:23 PM Go to last post
  2. Pearson or Spearman?

    Hello all I know you're supposed to observe a scatterplot first in order to see if the shape is monotonic or linear to determine which test to...

    Started by gene2420‎, 02-18-2014 12:24 PM
    • Replies: 5
    • Views: 1,839
    02-24-2014, 03:06 PM Go to last post
  3. 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...

    Started by Hombre‎, 02-24-2014 11:05 AM
    • Replies: 5
    • Views: 1,364
    02-24-2014, 01:37 PM Go to last post
  4. 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...

    Started by noirobscure‎, 02-18-2014 03:03 PM
    • Replies: 2
    • Views: 937
    02-24-2014, 11:09 AM Go to last post
  5. 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...

    Started by hrj21‎, 02-24-2014 10:47 AM
    • Replies: 0
    • Views: 759
    02-24-2014, 10:47 AM Go to last post
  6. 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...

    Started by Crunch‎, 02-21-2014 12:02 PM
    anova, post hoc
    • Replies: 2
    • Views: 1,397
    02-22-2014, 08:22 PM Go to last post
  7. 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...

    Started by silcol‎, 02-20-2014 11:53 AM
    • Replies: 0
    • Views: 2,343
    02-20-2014, 11:53 AM Go to last post
  8. 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...

    Started by daniel_goldman‎, 02-18-2014 04:40 AM
    poisson regression, time trend
    • Replies: 12
    • Views: 7,209
    02-19-2014, 06:52 PM Go to last post
  9. 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...

    Started by jhayes‎, 02-16-2014 05:51 PM
    overlap
    • Replies: 0
    • Views: 1,718
    02-16-2014, 05:51 PM Go to last post
  10. 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...

    Started by christopherh‎, 02-14-2014 06:16 AM
    • Replies: 0
    • Views: 1,079
    02-14-2014, 06:16 AM Go to last post
  11. Question 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. ...

    Started by JohnClayborn‎, 02-13-2014 05:56 PM
    • Replies: 0
    • Views: 1,063
    02-13-2014, 05:56 PM Go to last post
  12. 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...

    Started by JJstar‎, 02-13-2014 03:45 PM
    bayesian, metropolis-hastings
    • Replies: 1
    • Views: 1,499
    02-13-2014, 04:55 PM Go to last post
  13. 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...

    Started by Riguel‎, 02-13-2014 11:41 AM
    cap, distlm, permanova primer
    • Replies: 0
    • Views: 2,289
    02-13-2014, 11:41 AM Go to last post
  14. 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...

    Started by gaeborak‎, 02-12-2014 08:15 AM
    • Replies: 0
    • Views: 1,196
    02-12-2014, 08:15 AM Go to last post
  15. 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...

    Started by KarstenDK‎, 02-05-2014 11:52 PM
    anova, experimental design
    • Replies: 6
    • Views: 1,726
    02-11-2014, 12:57 AM Go to last post
  16. 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...

    Started by Theimmortal1‎, 02-10-2014 01:37 PM
    forecast error, optimization, skew and kurtosis, standard error, uncertainty
    • Replies: 0
    • Views: 1,045
    02-10-2014, 01:37 PM Go to last post
  17. 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...

    Started by Jake‎, 02-08-2014 11:40 PM
    • Replies: 0
    • Views: 1,660
    02-08-2014, 11:40 PM Go to last post
  18. Lightbulb 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...

    Started by tritto‎, 02-07-2014 02:39 PM
    mann-whitney
    • Replies: 3
    • Views: 1,812
    02-07-2014, 05:14 PM Go to last post
  19. 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...

    Started by NatePH‎, 02-07-2014 08:43 AM
    • Replies: 0
    • Views: 1,015
    02-07-2014, 08:43 AM Go to last post
  20. 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

    Started by Fred_a‎, 02-06-2014 11:38 PM
    conditional, density, normal
    • Replies: 1
    • Views: 1,296
    02-07-2014, 12:35 AM Go to last post
  21. 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...

    Started by F_Vial‎, 02-06-2014 04:10 AM
    exponential, moving average process
    • Replies: 0
    • Views: 1,514
    02-06-2014, 04:10 AM Go to last post
  22. 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-...

    Started by beachbomb94‎, 02-05-2014 11:34 AM
    • Replies: 1
    • Views: 1,447
    02-05-2014, 11:53 AM Go to last post
  23. 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,...

    Started by G_M_Vald‎, 02-05-2014 09:30 AM
    • Replies: 0
    • Views: 1,121
    02-05-2014, 09:30 AM Go to last post
  24. 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...

    Started by arkiaamu‎, 02-05-2014 03:10 AM
    • Replies: 0
    • Views: 855
    02-05-2014, 03:10 AM Go to last post
  25. 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...

    Started by denstat‎, 01-22-2014 09:43 AM
    • Replies: 7
    • Views: 1,488
    02-04-2014, 09:20 AM Go to last post
  26. 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...

    Started by purplelily‎, 01-21-2014 11:35 PM
    6 Pages
    1 2 3 ... 6
    • Replies: 77
    • Views: 8,771
    02-03-2014, 06:18 AM Go to last post
  27. 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. ...

    Started by CJ Rockball‎, 02-02-2014 10:39 AM
    • Replies: 0
    • Views: 969
    02-02-2014, 10:39 AM Go to last post
  28. 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...

    Started by vikingo‎, 01-23-2014 11:23 AM
    large sample size, power, pplot, sample size, ttest
    • Replies: 5
    • Views: 6,466
    02-01-2014, 05:47 PM Go to last post
  29. Wink 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...

    Started by statistic22‎, 12-14-2013 09:23 PM
    • Replies: 1
    • Views: 1,461
    02-01-2014, 05:38 PM Go to last post
  30. 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...

    Started by dlk2143‎, 01-29-2014 09:50 AM
    birds, compare, ecology, migration, trend analysis
    • Replies: 0
    • Views: 856
    01-29-2014, 09:50 AM Go to last post
  31. 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...

    Started by Student87‎, 01-29-2014 07:23 AM
    • Replies: 2
    • Views: 1,208
    01-29-2014, 09:06 AM Go to last post
  32. 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....

    Started by brian_maddox‎, 01-24-2014 01:08 PM
    • Replies: 3
    • Views: 1,951
    01-28-2014, 03:50 PM Go to last post
  33. 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...

    Started by Menthol‎, 01-27-2014 07:09 PM
    • Replies: 0
    • Views: 5,450
    01-27-2014, 07:09 PM Go to last post
  34. 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.

    Started by Madonna‎, 01-27-2014 04:04 AM
    • Replies: 11
    • Views: 3,153
    01-27-2014, 10:17 AM Go to last post
  35. Help!!!!!

    Is anyone seeing my posts? Please help!!!! It is an EMERGENCY

    Started by Madonna‎, 01-27-2014 06:04 AM
    • Replies: 2
    • Views: 1,637
    01-27-2014, 09:23 AM Go to last post
  36. 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...

    Started by fazzmo‎, 11-21-2012 05:24 AM
    • Replies: 1
    • Views: 1,461
    01-26-2014, 05:45 PM Go to last post
  37. 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...

    Started by hermes014‎, 01-26-2014 02:05 PM
    • Replies: 0
    • Views: 761
    01-26-2014, 02:05 PM Go to last post
  38. 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...

    Started by primobolan‎, 11-23-2013 02:21 PM
    • Replies: 1
    • Views: 1,237
    01-24-2014, 09:31 PM Go to last post
  39. 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)...

    Started by CA92‎, 01-24-2014 10:45 AM
    anova, assumptions, levene, levene's test, regression
    • Replies: 3
    • Views: 1,217
    01-24-2014, 01:47 PM Go to last post
  40. 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...

    Started by smithtl68‎, 01-07-2014 08:10 PM
    chi square, cluster randomized, hypotheisis testing, likert scale, null hypothesis
    • Replies: 3
    • Views: 10,283
    01-23-2014, 10:18 AM Go to last post
  41. 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...

    Started by impius‎, 01-23-2014 07:01 AM
    • Replies: 0
    • Views: 868
    01-23-2014, 07:01 AM Go to last post
  42. 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,...

    Started by Wendell‎, 01-22-2014 02:36 PM
    correlation analysis, likert, scales, validation
    • Replies: 0
    • Views: 1,587
    01-22-2014, 02:36 PM Go to last post
  43. 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...

    Started by Karashur‎, 01-19-2014 05:33 PM
    • Replies: 1
    • Views: 1,310
    01-21-2014, 12:52 PM Go to last post
  44. 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...

    Started by katlego‎, 01-18-2014 11:51 PM
    estimation
    • Replies: 2
    • Views: 1,443
    01-20-2014, 11:36 AM Go to last post
  45. Question 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...

    Started by Sambit‎, 01-20-2014 11:23 AM
    forecasting, moving average, time series
    • Replies: 0
    • Views: 1,202
    01-20-2014, 11:23 AM Go to last post
  46. 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...

    Started by Jrb599‎, 01-19-2014 11:20 AM
    • Replies: 3
    • Views: 1,487
    01-20-2014, 02:04 AM Go to last post
  47. Post 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...

    Started by JayPee‎, 01-19-2014 07:12 AM
    • Replies: 0
    • Views: 1,575
    01-19-2014, 07:12 AM Go to last post
  48. 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...

    Started by roysarel‎, 01-19-2014 03:29 AM
    dependent correlations
    • Replies: 0
    • Views: 1,493
    01-19-2014, 03:29 AM Go to last post
  49. 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...

    Started by dornsapothecary‎, 01-18-2014 11:59 AM
    anova, health research, logisitic regression, statistical design, statistical help
    • Replies: 0
    • Views: 953
    01-18-2014, 11:59 AM Go to last post
  50. 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...

    Started by ghada8888‎, 01-18-2014 09:50 AM
    • Replies: 0
    • Views: 2,013
    01-18-2014, 09:50 AM Go to last post
  51. 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...

    Started by consuli1‎, 01-17-2014 01:29 PM
    art bell, coast to coast
    • Replies: 1
    • Views: 2,224
    01-17-2014, 06:29 PM Go to last post
  52. 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...

    Started by boale87‎, 01-17-2014 01:12 PM
    benefits, economics, gdp, policy, unemployment
    • Replies: 0
    • Views: 1,283
    01-17-2014, 01:12 PM Go to last post
  53. 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...

    Started by jgruiz‎, 01-17-2014 10:45 AM
    • Replies: 0
    • Views: 1,271
    01-17-2014, 10:45 AM Go to last post
  54. 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...

    Started by Englund‎, 01-14-2014 03:40 PM
    • Replies: 10
    • Views: 3,874
    01-16-2014, 02:29 PM Go to last post
  55. 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...

    Started by DanWeaving‎, 01-08-2014 12:36 PM
    • Replies: 7
    • Views: 5,789
    01-14-2014, 08:18 AM Go to last post
  56. 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...

    Started by DAD‎, 01-13-2014 12:04 PM
    • Replies: 5
    • Views: 1,927
    01-13-2014, 04:00 PM Go to last post
  57. ANOVA Explanation

    Hey Guys, am not a statistician but came across a publication when researching on cloud computing but have not been able to understand the...

    Started by Future‎, 01-04-2014 09:48 AM
    • Replies: 1
    • Views: 1,180
    01-13-2014, 09:45 AM Go to last post
  58. 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...

    Started by Jordan.Davis‎, 01-12-2014 08:20 PM
    anova, factor design, homoscedasticity, levene, transformation
    • Replies: 0
    • Views: 1,534
    01-12-2014, 08:20 PM Go to last post
  59. Looking at differences. Having Groups within Groups. Please help!

    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...

    Started by dora1530‎, 01-12-2014 04:42 PM
    • Replies: 0
    • Views: 874
    01-12-2014, 04:42 PM Go to last post
  60. 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...

    Started by MBJ‎, 01-10-2014 05:30 AM
    covariance structure, repeated measurements
    • Replies: 0
    • Views: 2,119
    01-10-2014, 05:30 AM Go to last post

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