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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 197,256
    07-16-2014, 11:01 AM Go to last post
  2. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 67,017
    09-30-2005, 09:44 AM Go to last post
  1. Bootstrapping gives me significance, without it not so much

    For instance, in the table below, a GLM (ANOVA) Tukey posthoc bootstrapped 1000 times gives me a confidence interval like this. The columns are mean...

    Started by theblackalchemist‎, 07-31-2015 04:11 AM
    • Replies: 7
    • Views: 1,330
    08-06-2015, 12:29 PM Go to last post
  2. YES/NO Questionnaire analysis

    Hi, im trying to find out if Facebook usage has an impact on academic performance of high school students and I did a YES/No questionnaire. Please...

    Started by yav‎, 08-06-2015 03:27 AM
    • Replies: 3
    • Views: 1,374
    08-06-2015, 04:21 AM Go to last post
  3. Bayes on three diece

    Dear all, Today when I was playing ledo with three dice. I need only two from any single dice. I am new to probability, so I tired to solve by...

    Started by aravin‎, 08-05-2015 06:01 AM
    dice example of three., probabilty
    • Replies: 3
    • Views: 1,414
    08-05-2015, 08:50 AM Go to last post
  4. Unhappy Correct Test Statistic to Use?

    Hi all, May i ask your help choosing the correct Test for analysis of the following data? Problem: I have this data below and I want to know...

    Started by sandra3173‎, 08-05-2015 12:27 AM
    • Replies: 1
    • Views: 1,214
    08-05-2015, 05:44 AM Go to last post
  5. Question Which method is the best to assign samples into groups

    I have 100 samples, each of which has an real value of 1, 2, 3, or 4 for a characteristic (say C). I'll develop a few methods (say X, Y, Z) to...

    Started by xxqtony‎, 08-04-2015 02:09 PM
    • Replies: 2
    • Views: 1,130
    08-04-2015, 05:26 PM Go to last post
  6. What's happening when I do several correlations at once?

    Hi there, I have five variables (A, B, C, D, E), and I want to see how they are all correlated.I am using partial correlations because I want to...

    Started by PsyD_Student‎, 08-03-2015 09:49 AM
    • Replies: 5
    • Views: 2,204
    08-04-2015, 01:55 PM Go to last post
  7. Survival Data Help

    Hi, I'm attempting a binary logistics regressions with survival as the response, coded 0 (did not survive) and 1 (survived), and Heterozygosity as...

    Started by monkeyspearfish‎, 08-03-2015 10:30 AM
    • Replies: 5
    • Views: 1,610
    08-04-2015, 11:12 AM Go to last post
  8. Dichotomous variables for mediation

    Hello, I am an Australian SPSS beginner. I have mistakenly constructed dichotomous variables for my research but had planned to do mediation...

    Started by Lisa25‎, 08-01-2015 03:01 AM
    • Replies: 3
    • Views: 3,222
    08-04-2015, 08:44 AM Go to last post
  9. [AMOS] Conducting invariance tests with three binary IVs and two continuous DVs.

    Dear all, I'm a really beginner starting using AMOS. Here is my issue: I have a within subject design, with three IVs (each is binary, coded 0 or...

    Started by Bastien‎, 08-03-2015 10:17 PM
    • Replies: 1
    • Views: 1,264
    08-03-2015, 10:32 PM Go to last post
  10. Bayesian statistics proof question

    I know that if the prior distribution is chosen to be a continuous uniform distribution, then the exact posterior distribution will simply the...

    Started by Jeff3121‎, 08-02-2015 11:43 PM
    bayes, bayesian, proof
    • Replies: 1
    • Views: 898
    08-03-2015, 06:14 PM Go to last post
  11. Z test or T test?

    Looking at a spider diagram I assumed that i should use a Z-test for this hypothesis test however the solutions are saying a T-testing using an...

    Started by RO94‎, 08-03-2015 02:38 PM
    #help, #hypothesistesting, #statistics, #stats
    • Replies: 1
    • Views: 1,086
    08-03-2015, 06:02 PM Go to last post
  12. a question about statistic approach to use

    I moved this thread to another place and please delete this thread. Thank you.

    Started by lmuri‎, 08-03-2015 11:22 AM
    anova, paired t-test, within-subject
    • Replies: 0
    • Views: 1,382
    08-03-2015, 11:22 AM Go to last post
  13. Help with Minitab Data Analysis

    Finding Significant factors, main effects and interactions My name is Raj. I am new to DOE. I have performed manufacturing conditions...

    Started by raj81‎, 08-02-2015 01:25 PM
    • Replies: 1
    • Views: 1,582
    08-03-2015, 07:00 AM Go to last post
  14. Statistical significance of deviation from a complex-valued model

    I have complex-valued data. At each one of about 100 linearly spaced x values, I have a corresponding measurement of a complex quantity with...

    Started by Craiga‎, 08-02-2015 10:13 PM
    complex numbers, data analysis, statistical analysis
    • Replies: 0
    • Views: 849
    08-02-2015, 10:13 PM Go to last post
  15. maximum likelihood estimator question

    Hi all, i have this problem that was shown in class, and i am having difficulty with how to go about answering it. f(y1,y2,...,yn|θ)∝exp we are...

    Started by mh03‎, 08-02-2015 03:55 PM
    • Replies: 1
    • Views: 1,222
    08-02-2015, 07:44 PM Go to last post
  16. Method for evaluating fit of temperature model to data

    Hi there, I was hoping someone could give me a general explanation of what kind of test should be performed to see how well a model predicting the...

    Started by Drew87‎, 07-31-2015 03:31 PM
    • Replies: 2
    • Views: 1,888
    08-01-2015, 08:59 AM Go to last post
  17. ANOVA - discrepancy between main result and model parameters

    I am running a two-way ANOVA examining the influence of both school and gender on Likert scale answers. The Type III SS results show school...

    Started by azenz‎, 07-31-2015 09:53 AM
    anova, two-way anova
    • Replies: 0
    • Views: 979
    07-31-2015, 09:53 AM Go to last post
  18. Violating Linear Regression assumptions

    I have a dataset in which I am performing linear regression with multiple covariates. The goal of the analysis is to identify important covariates...

    Started by farre1pd‎, 07-29-2015 03:20 PM
    assumptions, autocorrelation, linear regression, residuals non-normal
    • Replies: 8
    • Views: 1,580
    07-31-2015, 08:38 AM Go to last post
  19. Split Plot/Mixed Model Analysis

    Hi, I have a data set that has several variables. I believe it would be most appropriate to do a split plot or mixed model type analysis. It is...

    Started by bjbreitling‎, 07-31-2015 08:15 AM
    mixed model, split plot, split-plot model mixed
    • Replies: 0
    • Views: 1,199
    07-31-2015, 08:15 AM Go to last post
  20. Spearmans rho: Attitude (on a Likert scale) Purchase Intentions (on a Likert scale)?

    I have measured 'Attitude towards a product' using Likert scale and I have measured 'Purchase Intentions to buy the product' also using Likert scale....

    Started by istatstudent‎, 07-31-2015 06:48 AM
    dependent variable, independent variable, likert items, spearman's rho
    • Replies: 0
    • Views: 943
    07-31-2015, 06:48 AM Go to last post
  21. Thumbs up HELP needed! Reverse coding

    Hello, I have some items to measure students' beliefs about the effects of their teachers' traits on their classroom participation. For example, I...

    Started by meringhina‎, 07-30-2015 05:55 PM
    • Replies: 1
    • Views: 923
    07-30-2015, 06:09 PM Go to last post
  22. Non significant results from one way repeated measures ANOVAs - what now?

    I am currently writing my thesis for an MSc in Sport Performance. My data collection involved running my participants through 5 different warm-up...

    Started by crdan4‎, 07-30-2015 11:06 AM
    anova, non significant, repeated measure anova
    • Replies: 3
    • Views: 1,142
    07-30-2015, 01:06 PM Go to last post
  23. people's shopping statistics

    Hello, I am building some project (website) on people's shopping (stuff stored in refrigerator) . I need to generate an automatic shopping cart...

    Started by michaelgr‎, 07-22-2015 03:53 AM
    • Replies: 3
    • Views: 1,479
    07-30-2015, 12:41 PM Go to last post
  24. What statistical test do I use and how to get data into stata

    Hello, I am trying to run a test with 1 dependent variable and 1 independent variable. I also have three other 'control variables' for which I...

    Started by bats‎, 07-30-2015 09:40 AM
    • Replies: 0
    • Views: 948
    07-30-2015, 09:40 AM Go to last post
  25. What statistical test should I use?

    Hi there, I'm trying to figure out what statistical test I should use to compare three categories of data - I am comparing the number of right...

    Started by dcl92‎, 07-30-2015 05:04 AM
    • Replies: 2
    • Views: 1,409
    07-30-2015, 06:41 AM Go to last post
  26. Sampling method- Random or Cluster

    Hello, Which methodology is better (and cheaper) to sampling a population N 3000, Random or cluster? Thanks

    Started by F.right‎, 07-29-2015 02:37 PM
    • Replies: 1
    • Views: 1,740
    07-29-2015, 02:46 PM Go to last post
  27. Question How do I identify the test statistic?

    Please help! I am stumped and I have no clue how to work this problem. Any help would be greatly appreciated! Thanks Listed below are ages of...

    Started by cindave‎, 07-29-2015 01:03 PM
    • Replies: 3
    • Views: 7,571
    07-29-2015, 01:56 PM Go to last post
  28. Can you perform an ANOVA on r-values (correlation values)?

    Hi all: This may be a simple question but... I'm doing neuroimaging research and long story short, I am doing what is essentially a correlational...

    Started by chainhomelow‎, 07-28-2015 03:59 PM
    anova, correlation, neuroscience, r value, z score
    • Replies: 2
    • Views: 2,133
    07-29-2015, 10:27 AM Go to last post
  29. Indices with data bound between -1 and +1

    Hi all, I would really appreciate some advice on how to deal with my data. I would like to compare data calculated from an index which is...

    Started by OCuk‎, 07-29-2015 10:01 AM
    data, glm, percentages, r code help, statistics
    • Replies: 0
    • Views: 1,085
    07-29-2015, 10:01 AM Go to last post
  30. Using a Matrix of Pairwise Probabilities

    I am trying to use this matrix to assign to a table of variables "small case letters indicate no difference at 5% significance". How do I do this? I...

    Started by NicholasFischer‎, 07-29-2015 09:34 AM
    • Replies: 0
    • Views: 654
    07-29-2015, 09:34 AM Go to last post
  31. What distribution is appropriate for length of a signal (in days)?

    I have a vector of "signal lengths", which is the amount of days a signal lasts once initially activated. For the purpose of confidence intervals and...

    Started by startraveler19‎, 07-28-2015 04:09 PM
    • Replies: 9
    • Views: 1,391
    07-29-2015, 06:07 AM Go to last post
  32. Factor Analysis

    Hi i have near 64 variables and i collected 614 questionnaire but when i want to analysis them i cant and i faced with this error : ((There are...

    Started by walter14‎, 07-28-2015 08:13 PM
    • Replies: 0
    • Views: 1,144
    07-28-2015, 08:13 PM Go to last post
  33. Comparing a Binomial and Normal Distribution

    So I'm currently analyzing several sets of data, that all represent the exact same type of data. There are multiple sets of this data, but however...

    Started by ducktoller1‎, 07-28-2015 02:53 PM
    binomial distribution, confidence interval, normal distribution, t test
    • Replies: 0
    • Views: 1,004
    07-28-2015, 02:53 PM Go to last post
  34. Am I causing statistical violations?

    Hi folks I am trying to analyze where the significant differences are between 2 sets of time series. Group 1 (Expert) has 29 trials normalised to...

    Started by DrMark‎, 07-28-2015 05:05 AM
    • Replies: 0
    • Views: 1,022
    07-28-2015, 05:05 AM Go to last post
  35. PISA 2012: Calculating variance explained by ESCS

    Hi there! I was wondering if anyone could help me figure out why I am getting the wrong results! I am using the PISA dataset of 2012 to calculate...

    Started by jenjen91‎, 07-26-2015 05:30 PM
    • Replies: 8
    • Views: 3,198
    07-27-2015, 07:03 PM Go to last post
  36. Question Regression analysis with moderator and multiple independent variables

    Hello, I am currently in the process of analyzing my survey results for my master's thesis. I want to test whether people in transparently...

    Started by Lana1910‎, 07-26-2015 10:29 AM
    moderator, regression
    • Replies: 1
    • Views: 1,222
    07-26-2015, 06:17 PM Go to last post
  37. Comparing variance in two machines / alpha for F test?

    Hi I'm pretty new to statistics. We have a homework problem to decide if a hospital should buy machine 1 or machine 2. We have the prices of the two...

    Started by MH2‎, 07-26-2015 11:41 AM
    • Replies: 0
    • Views: 888
    07-26-2015, 11:41 AM Go to last post
  38. Data varies with Date. how to measure overall change

    Hi everyone, I am new to statistics. A little help would be much appreciated. I have a data ( volume) which looks like this: Cities ...

    Started by ajeet‎, 07-26-2015 10:52 AM
    • Replies: 0
    • Views: 1,102
    07-26-2015, 10:52 AM Go to last post
  39. A thought about the link between Revelle's β coeff and CFA. Related?

    Hi stat freaks! :confused: I've just conducted an analysis of a scale's consistency (coeffs alpha, beta, omega, theta) and CFA to inspect the...

    Started by Martin Marko‎, 07-23-2015 02:45 PM
    cfa, consistency, revelle, scale development
    • Replies: 1
    • Views: 17,942
    07-25-2015, 04:19 PM Go to last post
  40. Hadith statistics

    200 years after Mohammed, half-a-dozen collectors gathered O(10^6) anecdotes about what he had said. Of these, they selected O(10^4) as reliable,...

    Started by ferren‎, 07-25-2015 03:46 AM
    confirmation bias, subjective data
    • Replies: 1
    • Views: 1,133
    07-25-2015, 01:19 PM Go to last post
  41. Legend needed for single series bar chart

    I am wondering if a legend is needed for a bar chart only displaying one data series? Thanks

    Started by MayTrix‎, 07-24-2015 07:16 PM
    • Replies: 1
    • Views: 981
    07-24-2015, 10:25 PM Go to last post
  42. Completely new to statistics - help needed

    Can someone please walk me through this? This is the text: As part of our reporting obligations we need to perform a statistical test to estimate...

    Started by homoludens‎, 07-24-2015 12:45 PM
    • Replies: 0
    • Views: 1,019
    07-24-2015, 12:45 PM Go to last post
  43. Uncertanity analysis using cut-off or Threshold value

    Dear members, I have an experimentally measured data points(y) for the variable x. These data points are random data and collected from more than...

    Started by kmgraju‎, 07-23-2015 01:43 AM
    • Replies: 3
    • Views: 3,017
    07-24-2015, 12:07 AM Go to last post
  44. Basic question

    Suppose you had a pile of 120 million red and blue jelly beans where 20 out of every 100,000 of them were red jelly beans. And suppose you moved ten...

    Started by Alpine‎, 07-22-2015 11:12 PM
    • Replies: 2
    • Views: 1,133
    07-23-2015, 08:49 PM Go to last post
  45. Multilevel Mediation

    Hi, I have 130 participants and have multilevel data (5 days nested in each participant). I need to do a cross-level mediation (2-1-1) & am having...

    Started by sonjacity‎, 07-23-2015 07:54 AM
    latent growth models, mediation, multi level, multilevel analysis, multilevel modeling
    • Replies: 0
    • Views: 932
    07-23-2015, 07:54 AM Go to last post
  46. R Distance Matrix

    I have my data in the following form i.e. Sample,Abundance -- These are the headers of the table. C1,345 C2,280 K1,250

    Started by gaurav_dc‎, 07-23-2015 01:45 AM
    matrix, r-language
    • Replies: 2
    • Views: 1,311
    07-23-2015, 05:52 AM Go to last post
  47. Notation of Variance of Residuals in Multilevel Modeling

    I am having some trouble to understand the notation of variance of residuals in multilevel modeling . In this paper "Sufficient Sample Sizes for...

    Started by Cynderella‎, 07-22-2015 01:52 PM
    applied statistics, hierarchical regression, intraclass correlation, mixed effects model, multilevel modeling
    • Replies: 3
    • Views: 1,550
    07-23-2015, 01:40 AM Go to last post
  48. Multiple Binary Data Correlation

    Hello everyone, I'm currently trying to find a method of finding the correlation between more than 2 sets of binary data at once. I have used phi...

    Started by Macio4‎, 07-21-2015 06:27 AM
    • Replies: 5
    • Views: 2,371
    07-22-2015, 10:04 AM Go to last post
  49. Data Analysis Tool in Excel

    I ran the descriptive analysis tool in excel but don't quite understand the output chart. I have a block of data that I want to analyze with a 95%...

    Started by gincity‎, 07-21-2015 10:18 AM
    • Replies: 5
    • Views: 1,576
    07-22-2015, 06:47 AM Go to last post
  50. Non-parametric testing

    Hello everyone! I am a student doing her master thesis. I have never studied or used statistics, but have been advised to do for my thesis. Let...

    Started by AlexTht‎, 07-22-2015 05:32 AM
    • Replies: 0
    • Views: 712
    07-22-2015, 05:32 AM Go to last post
  51. Feedback on Experiment: bosses and meetings

    As my context is rather specific, I'll try to write an analogy that sounds more natural and preserves all characteristics of the original problem. It...

    Started by golivax‎, 07-21-2015 01:41 PM
    experiment design, hypothesis testing
    • Replies: 0
    • Views: 1,290
    07-21-2015, 01:41 PM Go to last post
  52. How to get the serie of exceedances (Extreme Value Theory/Pot method)

    Dear members, HELP PLEASE :( I am working on EVT, using the POT method, I got the various parameters (shape, scale, threshold and the number of...

    Started by Nour‎, 07-21-2015 09:46 AM
    • Replies: 0
    • Views: 929
    07-21-2015, 09:46 AM Go to last post
  53. Cool Sampling Bias?

    Hi there, I have a sample that I'm using SAS to analyze. Basically, I'm looking to find average # of hospital visits that occurred after one year...

    Started by dyinu‎, 07-20-2015 08:00 PM
    • Replies: 3
    • Views: 1,592
    07-21-2015, 07:48 AM Go to last post
  54. Determining stationarity

    Hi there, I have this current problem to solve, relating to time series analysis Suppose that {et} is a white noise process with variance s2, and...

    Started by jful031‎, 07-20-2015 05:37 PM
    autocovariance, stationary, time series
    • Replies: 0
    • Views: 2,396
    07-20-2015, 05:37 PM Go to last post
  55. Unhappy How to use the Z-test or T-Test given the sample of a non-normal population

    Hi Everyone, I've tried my best to stay away from forums because I like to try to learn things on my own, but this is the third assignment I've had...

    Started by Rich-c‎, 07-18-2015 10:56 PM
    central limit theorem, normal distributed
    • Replies: 3
    • Views: 1,394
    07-20-2015, 11:50 AM Go to last post
  56. multi-comparison correction for a correlation study

    Hello all, I need to perform multiple non parametric (Spearman) correlation tests to generate a correlation matrix. In particular, Iím testing...

    Started by SIMONA MARZI‎, 07-20-2015 09:45 AM
    • Replies: 0
    • Views: 811
    07-20-2015, 09:45 AM Go to last post
  57. Difference in assumptions in Linear regression and logistic regression

    Hi everyone, I need some help from pros like you. I was thinking of making a tutorial for different assumptions we take in linear regression...

    Started by boomermitra‎, 07-20-2015 02:08 AM
    • Replies: 0
    • Views: 1,200
    07-20-2015, 02:08 AM Go to last post
  58. Comparing log-likelihood values for the same model (with different parameter values)

    Hi! I could use a little help and would be grateful for your time and thoughts. I have used the maximum likelihood (ML) method to fit a linear...

    Started by Steven_H‎, 07-19-2015 05:11 PM
    likelihood ratio test, log likelihood score
    • Replies: 0
    • Views: 2,823
    07-19-2015, 05:11 PM Go to last post
  59. Simple problem

    Hi all. Just have a quick question. If I have a measure and its SD, say 1.24 metres (0.3), how do I calculate the new SD if I change the measure...

    Started by Darkest Horse‎, 07-11-2015 12:35 PM
    • Replies: 11
    • Views: 2,173
    07-19-2015, 01:19 PM Go to last post
  60. Basic Statitics to Probability Problem

    Hi all, Iím new to the site, and only have a very basic understanding of statistics and probability, so forgive me if this question sounds silly....

    Started by Admonty‎, 07-18-2015 11:28 PM
    • Replies: 0
    • Views: 1,082
    07-18-2015, 11:28 PM Go to last post

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