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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 03:56 AM
    • Replies: 14
    • Views: 2,327
    10-11-2014, 12:02 PM Go to last post
  1. What statistical test do I use to tell if my data statistically significant?

    This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of...

    Started by galaxz‎, Yesterday 08:12 PM
    correlations, statistical significance
    • Replies: 0
    • Views: 52
    Yesterday, 08:12 PM Go to last post
  2. Interesting abstract question - Statisticians pls chk this

    I have a massive dataset (10s of millions of rows and 100s of dimensions). The dimensions are of all conceivable data types. How do I arrive at...

    Started by checkharish‎, Yesterday 02:06 PM
    big data, massive data sets, sampling
    • Replies: 0
    • Views: 58
    Yesterday, 02:06 PM Go to last post
  3. PhD Dissertation Help- General guidance and direction desperately needed!!!!

    Hi, I have been reading many of your comments and I was hoping that you could give me advice. I'm currently in my second year of the dissertation...

    Started by Penny_BBT‎, 03-26-2015 04:48 PM
    • Replies: 0
    • Views: 90
    03-26-2015, 04:48 PM Go to last post
  4. Marginal of Gaussian

    I have a slight problem with the marginal distribution of a Gaussian. First, assume (d,r) are jointly Gaussian of dimension 2n. It is known that d...

    Started by Tosha‎, 03-26-2015 12:36 PM
    • Replies: 2
    • Views: 119
    03-26-2015, 04:43 PM Go to last post
  5. Taguchi designs

    Dear TalkStats Forum, I am using Taguchi design in my experiments. I have a presentation soon and I want to explain this design in a very dynamic...

    Started by diegorg‎, 03-26-2015 12:09 PM
    • Replies: 1
    • Views: 86
    03-26-2015, 03:31 PM Go to last post
  6. 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...

    Started by elmorem‎, 03-25-2015 09:04 PM
    binary data, comparing percentages, comparing rates, t-test
    • Replies: 0
    • Views: 91
    03-25-2015, 09:04 PM Go to last post
  7. descriptive correlational study

    hello! We have a research study entitled "COMPETENCE ON SAFETY PROTOCOLS AMONG HEALTH AND DISASTER COMMITTEE MEMBERS AND DEGREE OF TRUST OF...

    Started by JAR‎, 03-25-2015 12:17 PM
    • Replies: 1
    • Views: 103
    03-25-2015, 01:30 PM Go to last post
  8. If anyone can help please!! In DESPERATE need of clarification!

    Hi Everyone This is my first time on the site. Basically I am conducting some research for a dissertation I have to do as part of my course. ...

    Started by lily2190‎, 03-24-2015 11:47 AM
    binomial, chi sq, spss
    • Replies: 2
    • Views: 135
    03-25-2015, 03:17 AM Go to last post
  9. Poll Poll: Ordinal or continuous scale?

    Hello, I have carried experiments where the participants were asked to rate a parameter on a scale. The scale starts from “not heavy” to “heavy”;...

    Started by emmenru‎, 03-23-2015 05:57 AM
    • Replies: 0
    • Views: 115
    03-23-2015, 05:57 AM Go to last post
  10. Comparing subsets of data from the same population?

    I'm hoping someone can help me conceptualize my question better because I have a feeling I'm looking at it the wrong way. I'm looking at a number of...

    Started by sosaysi‎, 03-19-2015 04:16 PM
    • Replies: 0
    • Views: 170
    03-19-2015, 04:16 PM Go to last post
  11. Control Variable as part of the Dependent Variable - Problem? Solutions?

    Dear all, I'm currently trying to figure out the following problem: I have a dependent variable which is build as the standard deviation of six...

    Started by StatisticlyClueless‎, 03-15-2015 07:48 AM
    • Replies: 2
    • Views: 338
    03-19-2015, 08:36 AM Go to last post
  12. Modeling ordinal responses with nested data

    Hello, I am preparing a study that would involve modeling responses an ordinal scale. These responses identify the behaviors of high school...

    Started by libertylanding‎, 03-18-2015 11:09 AM
    • Replies: 1
    • Views: 134
    03-18-2015, 11:40 AM Go to last post
  13. Post Statistical Model to Use for 1 independent variable and 2 dependent variables

    Hello,i'm Oliver John a civil engineering undergrad student.I'm quiet uncertain unto which statistical analysis should i use for my data consisting...

    Started by oliverjohn‎, 03-17-2015 01:42 AM
    • Replies: 0
    • Views: 163
    03-17-2015, 01:42 AM Go to last post
  14. Derivation of OLS residuals and asymptotic properties

    Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

    Started by artzahar‎, 03-11-2015 07:45 PM
    • Replies: 0
    • Views: 219
    03-11-2015, 07:45 PM Go to last post
  15. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 1
    • Views: 429
    03-11-2015, 05:17 PM Go to last post
  16. Non parametric test help - Grad student

    I have a data set of 6 different element's values (i.e. Aluminum= 0.25, Copper= 0.06, etc.) over a two year period. I am trying to see if there are...

    Started by ztor‎, 03-11-2015 01:18 PM
    • Replies: 0
    • Views: 119
    03-11-2015, 01:18 PM Go to last post
  17. How to generate an autocorrelated random variable?

    Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

    Started by consuli‎, 03-04-2015 04:06 PM
    2 Pages
    1 2
    autocorrelation
    • Replies: 15
    • Views: 531
    03-11-2015, 01:08 PM Go to last post
  18. Sampling Samples from a Big Data Set in R

    I have a large data set (23 million records, ~ 9 Gb) coming in R and am trying to figure out the best way to draw a sample from it. The plan I...

    Started by journalist‎, 03-11-2015 11:21 AM
    big data, sampling
    • Replies: 0
    • Views: 120
    03-11-2015, 11:21 AM Go to last post
  19. Which statistical test to use to establish different behaviour between groups?

    Hi, I have got a dataset with a dichotomous groupid variable and many other independent categorical variables. My aim is to find out if subjects...

    Started by ambij‎, 03-08-2015 05:20 AM
    chi-squared, fishersexact, logistic, statistical-significance
    • Replies: 0
    • Views: 194
    03-08-2015, 05:20 AM Go to last post
  20. Univariate vs Multivariate results

    Hi, Am I correct in assuming that if a variable was found to be good predictor in univariate analysis, it should also be found to be a good...

    Started by ambij‎, 03-08-2015 05:19 AM
    multivariate-analysis, multivariate-regression, predictor, univariate
    • Replies: 0
    • Views: 137
    03-08-2015, 05:19 AM Go to last post
  21. repeated measure ANOVA, are comparisons at different time points independent?

    Hi, i have been set the task to critically analyse a research paper > http://wageningenacademic.metapress.com/content/5065134j5v339382/fulltext.pdf ...

    Started by mattiel‎, 03-07-2015 07:54 AM
    repeated measures anova
    • Replies: 0
    • Views: 142
    03-07-2015, 07:54 AM Go to last post
  22. Data Capture

    I'm not sure if this is the correct place to ask this question. I have a support team in my office and I want to understand why people are calling...

    Started by kiwis‎, 03-06-2015 01:06 PM
    • Replies: 1
    • Views: 143
    03-06-2015, 04:27 PM Go to last post
  23. mean+standard deviation+skewness+kurtosis

    hi I want to order some variables according to (mean+standard deviation+skewness+kurtosis) or some new rule considering mean value, standard...

    Started by WEIBO‎, 03-06-2015 04:51 AM
    kurtosis, skewness
    • Replies: 8
    • Views: 318
    03-06-2015, 01:25 PM Go to last post
  24. Convergence in LLN and CLT help!

    Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

    Started by artzahar‎, 03-06-2015 03:29 AM
    central limit theore, law of large number, statistics
    • Replies: 1
    • Views: 133
    03-06-2015, 07:34 AM Go to last post
  25. sample size calculation

    I am trying to determine the necessary sample size I need for a study. Standard 80% power and </= 0.05 p value. The study is designed to use two...

    Started by GGarvin‎, 03-05-2015 08:06 PM
    • Replies: 1
    • Views: 163
    03-06-2015, 01:47 AM Go to last post
  26. Standard Deviation of non-numerical data

    I am trying to determine the standard deviation data that is not itself numerical, but its count is. For example, If I have a dataset from a survey...

    Started by Ghostbusters‎, 03-05-2015 02:51 PM
    • Replies: 0
    • Views: 98
    03-05-2015, 02:51 PM Go to last post
  27. Help assessing convergence across categorical responses

    Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

    Started by COFisher‎, 03-05-2015 10:07 AM
    • Replies: 0
    • Views: 105
    03-05-2015, 10:07 AM Go to last post
  28. Smile Do I have to test normality?

    I have an experiment contains 10 students and 2 experts. I want to test if the average of students evaluation for the 1st question is similar to...

    Started by ger95‎, 03-03-2015 04:11 AM
    • Replies: 2
    • Views: 189
    03-03-2015, 10:55 AM Go to last post
  29. Help with correct statistical test please

    Hi everyone. I am a novice at statistical tests, as such I need urgent help in determining what type of statistical test to use in hypothesis testing...

    Started by oludot5‎, 03-03-2015 04:20 AM
    • Replies: 1
    • Views: 151
    03-03-2015, 04:28 AM Go to last post
  30. 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 07:22 PM
    • Replies: 2
    • Views: 446
    02-27-2015, 08:51 AM Go to last post
  31. 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, 02-26-2015 07:21 AM
    • Replies: 0
    • Views: 189
    02-26-2015, 07:21 AM Go to last post
  32. 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, 02-26-2015 06:44 AM
    • Replies: 0
    • Views: 155
    02-26-2015, 06:44 AM Go to last post
  33. 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 09:23 PM
    • Replies: 0
    • Views: 156
    02-25-2015, 09:23 PM Go to last post
  34. 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 06:55 PM
    • Replies: 0
    • Views: 179
    02-24-2015, 06:55 PM Go to last post
  35. 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 08:45 AM
    • Replies: 2
    • Views: 168
    02-24-2015, 11:02 AM Go to last post
  36. 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 09:25 AM
    • Replies: 0
    • Views: 153
    02-24-2015, 09:25 AM Go to last post
  37. 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 02:19 PM
    convenience sampling
    • Replies: 2
    • Views: 224
    02-24-2015, 05:20 AM Go to last post
  38. 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 01:47 AM
    • Replies: 0
    • Views: 142
    02-24-2015, 01:47 AM Go to last post
  39. 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 05:21 AM
    • Replies: 0
    • Views: 135
    02-23-2015, 05:21 AM Go to last post
  40. 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 08:46 AM
    • Replies: 4
    • Views: 248
    02-21-2015, 04:46 PM Go to last post
  41. 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 02:08 PM
    • Replies: 0
    • Views: 163
    02-21-2015, 02:08 PM Go to last post
  42. 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 07:05 AM
    by-subject by-item
    • Replies: 1
    • Views: 194
    02-20-2015, 09:22 AM Go to last post
  43. 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 06:33 AM
    • Replies: 2
    • Views: 205
    02-19-2015, 11:15 AM Go to last post
  44. 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 07:48 AM
    l test, logit, regression, research, statistica
    • Replies: 0
    • Views: 165
    02-19-2015, 07:48 AM Go to last post
  45. 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 01:50 AM
    continuous variable, interaction, statistical analysis
    • Replies: 3
    • Views: 374
    02-18-2015, 03:15 PM Go to last post
  46. 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 05:22 AM
    meteorological variables, research for thesis, statistical analysis, temperature, weather
    • Replies: 0
    • Views: 144
    02-18-2015, 05:22 AM Go to last post
  47. 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 12:46 PM
    distance, distance measure, metrics, multivariate analysis, nonparametric
    • Replies: 0
    • Views: 181
    02-15-2015, 12:46 PM Go to last post
  48. 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 07:06 AM
    • Replies: 0
    • Views: 162
    02-12-2015, 07:06 AM Go to last post
  49. 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 01:17 PM
    • Replies: 3
    • Views: 249
    02-09-2015, 02:20 PM Go to last post
  50. 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 03:25 AM
    • Replies: 1
    • Views: 1,388
    02-08-2015, 08:48 AM Go to last post
  51. 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 05:36 AM
    • Replies: 0
    • Views: 182
    02-07-2015, 05:36 AM Go to last post
  52. 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 03:40 AM
    • Replies: 0
    • Views: 188
    02-07-2015, 03:40 AM Go to last post
  53. 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 06:22 PM
    • Replies: 4
    • Views: 312
    02-05-2015, 12:46 PM Go to last post
  54. 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 12:03 PM
    mcnemar's test, odds ratio, post-hoc, power analysis, power calculation
    • Replies: 1
    • Views: 222
    02-04-2015, 12:13 PM Go to last post
  55. 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 05:37 PM
    • Replies: 0
    • Views: 263
    01-30-2015, 05:37 PM Go to last post
  56. 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 10:24 AM
    manova, non-parametric test, rank-order data
    • Replies: 2
    • Views: 404
    01-28-2015, 02:50 PM Go to last post
  57. 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 09:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 343
    01-28-2015, 01:46 PM Go to last post
  58. 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 10:32 PM
    • Replies: 1
    • Views: 298
    01-28-2015, 03:18 AM Go to last post
  59. 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 12:35 PM
    friedman test, friedman's anova, non-parametric anova, planned comparisons, planned contrasts
    • Replies: 0
    • Views: 176
    01-26-2015, 12:35 PM Go to last post
  60. 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 07:50 AM
    • Replies: 0
    • Views: 155
    01-26-2015, 07:50 AM Go to last post

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