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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: 2,081
    10-11-2014, 01:02 PM Go to last post
  1. How to measure relationship between two series

    Hi everybody, I am looking for direction on how to proceed with the following issue. I am running some experiments relating to the appearance...

    Started by tuathal‎, Yesterday 08:21 AM
    • Replies: 0
    • Views: 80
    Yesterday, 08:21 AM Go to last post
  2. Testing for a difference in standard deviation

    Hello Everyone I've encountered the following problem - I have this test that was administrated to a sample of participants, in a 2X2 design (both...

    Started by Curious guy‎, Yesterday 07:44 AM
    • Replies: 0
    • Views: 46
    Yesterday, 07:44 AM Go to last post
  3. Need help picking model to use with psuedo time series data

    Hello everyone. I have quite a few questions and would like some help/advice or a general pointing i the correct direction. I have a dataset that...

    Started by Anotherdream‎, 02-25-2015 10:23 PM
    • Replies: 0
    • Views: 74
    02-25-2015, 10:23 PM Go to last post
  4. 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...

    Started by nebulus‎, 02-24-2015 07:55 PM
    • Replies: 0
    • Views: 110
    02-24-2015, 07:55 PM Go to last post
  5. Transformation of a Uniform Distribution needed

    Hello, I have got a crazy distributed p4. (See file attachment). How can I transform a uniform distribution into the one of p4? Probit...

    Started by consuli‎, 02-24-2015 09:45 AM
    • Replies: 2
    • Views: 93
    02-24-2015, 12:02 PM Go to last post
  6. Event Study - Impact from different periods

    Hi! I was wondering if you could help me with something. I would really, really appreciate it. As it is some time since i did my econometrics...

    Started by Upper‎, 02-24-2015 10:25 AM
    • Replies: 0
    • Views: 68
    02-24-2015, 10:25 AM Go to last post
  7. convenience sampling and p-values

    Dear all, I am in the middle of my research. I gathered data (via convenience sampling). I intend to run PCA/EFA and then use dimensions in logistic...

    Started by purifyz‎, 02-23-2015 03:19 PM
    convenience sampling
    • Replies: 2
    • Views: 132
    02-24-2015, 06:20 AM Go to last post
  8. Help needed in analyzing sequential data

    Hi! I hope for your advice and directions: I've data that codes a sequence of behaviors. Each sequences is of different lengths. I have 1400...

    Started by Sam31‎, 02-24-2015 02:47 AM
    • Replies: 0
    • Views: 78
    02-24-2015, 02:47 AM Go to last post
  9. 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:...

    Started by consuli‎, 02-23-2015 06:21 AM
    • Replies: 0
    • Views: 67
    02-23-2015, 06:21 AM Go to last post
  10. How to alter the standard deviation of an empirical distribution?

    For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

    Started by consuli‎, 02-21-2015 09:46 AM
    • Replies: 4
    • Views: 168
    02-21-2015, 05:46 PM Go to last post
  11. Question Mixed model for two way ANOVA with SPSS

    Hi, I have to do a two way anova repeated measures (one between factor with 2 levels: control and treated, one within factor with 3 levels: time...

    Started by franziska77‎, 02-21-2015 03:08 PM
    • Replies: 0
    • Views: 95
    02-21-2015, 03:08 PM Go to last post
  12. analysis over all items OR by-subject OR by-items analysis?

    Hi, Let's say you have a data set of for instance 20 subjects who all answered 15 questions. Every question is one items that is either correct...

    Started by fruppel‎, 02-20-2015 08:05 AM
    by-subject by-item
    • Replies: 1
    • Views: 128
    02-20-2015, 10:22 AM Go to last post
  13. How to generate multiple correlated variables?

    Hello! One can generate two c0rrelated variables as follows: x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal random variable...

    Started by consuli‎, 02-18-2015 07:33 AM
    • Replies: 2
    • Views: 149
    02-19-2015, 12:15 PM Go to last post
  14. Help in determining a proper statistical test an approach for research question

    Ik have a problem in determining the right statistical test for my research. First I will give some background information. I want to research the...

    Started by Redmar89‎, 02-19-2015 08:48 AM
    l test, logit, regression, research, statistica
    • Replies: 0
    • Views: 115
    02-19-2015, 08:48 AM Go to last post
  15. Question Choosing an appropriate test: MANOVA? ANCOVA? Something else?

    I am performing a "dry run" statistical analysis on my dissertation data pretest, and I'm looking for a little guidance regarding the specific...

    Started by Eaners‎, 02-13-2015 02:50 AM
    continuous variable, interaction, statistical analysis
    • Replies: 3
    • Views: 279
    02-18-2015, 04:15 PM Go to last post
  16. statistical analyis of weather data

    Hello, I made ambient temperature and relative humidity measurements using a sensor, next to a highly accurate meteorological station and i want...

    Started by shays‎, 02-18-2015 06:22 AM
    meteorological variables, research for thesis, statistical analysis, temperature, weather
    • Replies: 0
    • Views: 92
    02-18-2015, 06:22 AM Go to last post
  17. similarity between two random variables

    There have two random variables, each of which is of five dimension. One random variable tracks the data collected from one device. The other random...

    Started by winecoding‎, 02-15-2015 01:46 PM
    distance, distance measure, metrics, multivariate analysis, nonparametric
    • Replies: 0
    • Views: 129
    02-15-2015, 01:46 PM Go to last post
  18. 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. ...

    Started by consuli‎, 02-12-2015 08:06 AM
    • Replies: 0
    • Views: 115
    02-12-2015, 08:06 AM Go to last post
  19. equal/unequal sample sizes

    I have recently sent a paper on aflatoxin levels in nuts for publishing. The aim of the study was to analyze a total amount of 106 nuts. The nuts...

    Started by ivn‎, 02-09-2015 02:17 PM
    • Replies: 3
    • Views: 188
    02-09-2015, 03:20 PM Go to last post
  20. ANOVA not significant but Tukey is

    I'm still new to stats and would like to know if the results below indicate significance, or at least a trend. Being compared are three independent...

    Started by Petes‎, 12-11-2012 04:25 AM
    • Replies: 1
    • Views: 1,303
    02-08-2015, 09:48 AM Go to last post
  21. help with significant interaction, but without simple effects in 2*3 repeated ANOVA

    Dear Experts, I have a 2*3 repeated ANOVA data. I found a significant interaction effect between them (it is a marginal effect, p=0.047). However,...

    Started by lickey1981‎, 02-07-2015 06:36 AM
    • Replies: 0
    • Views: 137
    02-07-2015, 06:36 AM Go to last post
  22. Exclamation Permutation - distribution

    Dear All, I'm in need for some help. I have two data sets looking like this (just as an example): Dataset 1: GCA GCT GCC GCG...

    Started by mrtwino‎, 02-07-2015 04:40 AM
    • Replies: 0
    • Views: 139
    02-07-2015, 04:40 AM Go to last post
  23. Angry Call response time distribution [Help needed]

    Hello everyone! I'm new to this forum but I want to start off by making a request. The thing is I'm working on a project regarding call-back...

    Started by The_Chosen_One‎, 02-04-2015 07:22 PM
    • Replies: 4
    • Views: 248
    02-05-2015, 01:46 PM Go to last post
  24. 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,...

    Started by elmorem‎, 02-04-2015 01:03 PM
    mcnemar's test, odds ratio, post-hoc, power analysis, power calculation
    • Replies: 1
    • Views: 159
    02-04-2015, 01:13 PM Go to last post
  25. Post 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...

    Started by Elhama‎, 01-30-2015 06:37 PM
    • Replies: 0
    • Views: 205
    01-30-2015, 06:37 PM Go to last post
  26. Scale Issue - MANOVA vs Kruskall Wallis

    Hello, In my dissertation, I asked people in the general population to complete a battery of team process measures based on an effective team...

    Started by I-O Student‎, 01-07-2015 11:24 AM
    manova, non-parametric test, rank-order data
    • Replies: 2
    • Views: 342
    01-28-2015, 03:50 PM Go to last post
  27. Question Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

    Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

    Started by Eaners‎, 01-27-2015 10:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 274
    01-28-2015, 02:46 PM Go to last post
  28. Non-parametric test (2 related samples)

    At present I am working on a hospital data set. I have categorised cases as either having Error or No Error. Another variable is the hospital...

    Started by jle‎, 01-27-2015 11:32 PM
    • Replies: 1
    • Views: 249
    01-28-2015, 04:18 AM Go to last post
  29. Planned contrasts in Friedman's ANOVA

    Is it possible to investigate planned contrasts in Friedman's ANOVA or is it only possible to investigate pairwise comparisons? Thank you for your...

    Started by Konstantin‎, 01-26-2015 01:35 PM
    friedman test, friedman's anova, non-parametric anova, planned comparisons, planned contrasts
    • Replies: 0
    • Views: 128
    01-26-2015, 01:35 PM Go to last post
  30. Types of Predictive Models

    Among the predictive models there are some, 1. which deliver exactly one solution for the estimation problem (e.g. regression, GLM, ...) 2....

    Started by consuli‎, 01-26-2015 08:50 AM
    • Replies: 0
    • Views: 115
    01-26-2015, 08:50 AM Go to last post
  31. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, 01-24-2015 09:42 AM
    • Replies: 3
    • Views: 234
    01-26-2015, 06:44 AM Go to last post
  32. Bang and Tsiatis - t-test after?

    I have a treatment group and a control group (as a result of a matched cohort). I am comparing 12 month costs for a program but since not everyone...

    Started by lancearmstrong1313‎, 01-23-2015 01:24 PM
    • Replies: 2
    • Views: 160
    01-26-2015, 06:30 AM Go to last post
  33. help calculating needed sample size

    hi im conducting a study on a certain ratio in a blood exam (lets call it X) . I aim to say that there is a certain sensitivity (let say>80%) for...

    Started by urilee‎, 01-25-2015 04:22 AM
    • Replies: 0
    • Views: 149
    01-25-2015, 04:22 AM Go to last post
  34. A question regarding Cronbach's Alpha

    Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

    Started by graphicsgriffin‎, 09-18-2011 07:25 AM
    • Replies: 2
    • Views: 1,042
    01-24-2015, 03:18 PM Go to last post
  35. Comparing Likert items. What test should I use?

    Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

    Started by RDW‎, 01-23-2015 09:09 AM
    • Replies: 3
    • Views: 211
    01-24-2015, 07:59 AM Go to last post
  36. Test to compare difference between median value in two discrete samples

    Hi, I have two collection of ordinal samples for a discrete variable related to two administration of an experiment. Using Kolmogorov-Smirnov, I...

    Started by Vito_Mangh‎, 01-22-2015 10:59 AM
    discrete vc comparison, inference, mann-whitney test, test hypothesis, wilcoxon rank sum test
    • Replies: 1
    • Views: 171
    01-22-2015, 11:20 AM Go to last post
  37. Factor Analysis and Cronbach Alpha

    Hi, I would like to ask you about type of data which can be used for factor analysis or for control internal reliability (Cronbach Alpha). I'm...

    Started by langouste‎, 01-18-2015 04:08 PM
    • Replies: 0
    • Views: 204
    01-18-2015, 04:08 PM Go to last post
  38. Multiple choice preference experiments, analysis by Lockwood 1998 Oecoligia 116: 475-

    Anyone familiar with Lockwood's method for multiple choice significance tests using modified Hotelling T2? I'm stuck on trying to understand his...

    Started by jeff k‎, 01-14-2015 08:22 PM
    • Replies: 1
    • Views: 241
    01-16-2015, 03:05 PM Go to last post
  39. Need help with growth model

    Hi, I have a research question that I am not sure how I should answer it. I think I may have to use growth model, but not sure! I appreciate your...

    Started by anna_258‎, 01-16-2015 04:56 AM
    • Replies: 0
    • Views: 171
    01-16-2015, 04:56 AM Go to last post
  40. Propagation of Poisson Errors

    How do I combine the asymmetrical errors when I subtract my samples from the controls? I know my low counts follow a Poisson distribution and...

    Started by nbryan5‎, 01-15-2015 11:13 PM
    error propagation, poisson
    • Replies: 1
    • Views: 173
    01-15-2015, 11:27 PM Go to last post
  41. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 385
    01-15-2015, 11:27 AM Go to last post
  42. Over-simple Stats?

    Hi all, This should hopefully be a really simple question but I think I am confusing myself over a throwaway comment that someone made.... Say...

    Started by smcdougall‎, 01-14-2015 11:35 AM
    hierarchical, multi level
    • Replies: 5
    • Views: 282
    01-15-2015, 09:16 AM Go to last post
  43. Correlation significance critical values

    I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

    Started by globaljaco‎, 01-15-2015 07:50 AM
    • Replies: 1
    • Views: 209
    01-15-2015, 08:41 AM Go to last post
  44. Appropriate test for two treatment types with zero-inflated data

    Hello all, I am trying to determine if there is a difference in falcon abundance between inside a forest reserve and outside the reserve. I ran...

    Started by mbwaterdog‎, 01-14-2015 05:20 PM
    • Replies: 1
    • Views: 160
    01-14-2015, 06:48 PM Go to last post
  45. Latent indicators for SEM query

    Hello, I've recently had a paper using SEM models reviewed. In the model I had four latent variables each with >2 indicators. For each indicator...

    Started by loops22‎, 01-14-2015 10:54 AM
    • Replies: 0
    • Views: 121
    01-14-2015, 10:54 AM Go to last post
  46. risk-adjustment for patient characteristics for survey

    Hi, Does anyone have any experience conducting surveys. For some surveys in order to ensure sample characteristics is representative of...

    Started by proc1125‎, 01-13-2015 09:54 AM
    • Replies: 0
    • Views: 221
    01-13-2015, 09:54 AM Go to last post
  47. This might be a simple statistics question, or a really odd statistics question.

    I am not a statistics person, so I am not sure if this is a statistics type question or a question that has an answer. I am not sure how best to...

    Started by simpleton‎, 01-11-2015 09:58 AM
    • Replies: 3
    • Views: 599
    01-11-2015, 03:40 PM Go to last post
  48. Question Calculate Sample size using calculator ?

    Hello Can some one give me formula to calculate sample size using calculator or manually. This data I have right now: Population size = 500...

    Started by hanialbarni‎, 12-25-2014 07:01 PM
    • Replies: 4
    • Views: 490
    01-11-2015, 12:00 PM Go to last post
  49. 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...

    Started by RMann‎, 01-11-2015 07:37 AM
    • Replies: 0
    • Views: 167
    01-11-2015, 07:37 AM Go to last post
  50. noramlization

    I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

    Started by eunkum‎, 01-08-2015 02:06 PM
    normalization
    • Replies: 3
    • Views: 397
    01-10-2015, 01:07 AM Go to last post
  51. Okay to Sum Numerical Values of Categorical Variables?

    Hi. I have questions regarding categorical variables. Can you create a scaled variable out of several dichotomous variables? For example if I...

    Started by Aryianna‎, 01-08-2015 12:17 AM
    analysis, categorical, dichotomous, statistics
    • Replies: 0
    • Views: 246
    01-08-2015, 12:17 AM Go to last post
  52. Pseudoreplication for my PhD Thesis: any advices?

    Hello to everybody, that's my first post in the forum. :wave: I apologize for i) my bad english and ii) for the lenght of the post :rolleyes: ...

    Started by Muzzé‎, 12-27-2014 04:26 AM
    • Replies: 3
    • Views: 644
    01-04-2015, 09:06 PM Go to last post
  53. Ms

    I am doing a research on Consumer attitude regarding Eco-friendly FMCG. My hypothesis is" There is no relationship between key variables of green...

    Started by SudhaSharma‎, 01-04-2015 11:43 AM
    • Replies: 1
    • Views: 272
    01-04-2015, 11:56 AM Go to last post
  54. Multifactorial analysis with R integrated TIME

    Hi! I'm about to analyze data using a multifactorial analysis with the R (Rcmdr) software and I'm not too sure on how to organize the factor groups....

    Started by cha‎, 12-22-2014 05:28 AM
    multifactorial analysis, time
    • Replies: 0
    • Views: 353
    12-22-2014, 05:28 AM Go to last post
  55. bounded pareto distribution

    please any one can help me about the inversion method that is used to form a bounded pareto I can't understand the inversion method that is used in...

    Started by batooool‎, 12-17-2014 09:49 AM
    • Replies: 1
    • Views: 369
    12-20-2014, 04:25 PM Go to last post
  56. Colculation Geometric Brownian Motion with deposits.

    Hi all. There is a way of colculation a future standart diviation of a portfolio if you know the daily standart diviation and the mean. ...

    Started by borislivs‎, 12-20-2014 03:00 PM
    • Replies: 1
    • Views: 202
    12-20-2014, 04:15 PM Go to last post
  57. How to alculate cross loadings of each item in SPSS ?

    Hello Can someone give me the way to do it in SPSS

    Started by hanialbarni‎, 12-20-2014 12:04 AM
    • Replies: 0
    • Views: 205
    12-20-2014, 12:04 AM Go to last post
  58. Calculating the standard error of an odds ratio from the standard errors of 2 logits

    I've just completed a logistic regression model with a continuous covariate, and calculated the logit and standard errors using SAS for creating a...

    Started by Disvengeance‎, 12-13-2014 09:53 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 1,278
    12-18-2014, 10:02 PM Go to last post
  59. How to do a Validation Study?

    My professor has asked me to do a validation study but I have never done one before and don't know what methodology or statistics to use. Basically...

    Started by amber82‎, 12-16-2014 11:44 PM
    methodology, scales, validate scale, validation
    • Replies: 1
    • Views: 255
    12-17-2014, 01:05 AM Go to last post
  60. Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It...

    Started by tez_s‎, 08-15-2012 08:20 AM
    dummy coding, mediation analysis, regression
    • Replies: 4
    • Views: 2,961
    12-16-2014, 08:27 PM Go to last post

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