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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: 200,485
    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: 68,625
    09-30-2005, 09:44 AM Go to last post
  1. What's wrong with my BANOVA (Bayesian ANOVA)?

    Hi everyone... I'm new to Bayesian statistics and I'm trying to perform a BANOVA. I'm using the following book to help me: "Doing Bayesian Data...

    Started by Tokyo‎, Today 02:38 PM
    anova, banova, bayesian, mcmc
    • Replies: 0
    • Views: 4
    Today, 02:38 PM Go to last post
  2. Chi Square pretest criterion 1

    Hello guys, I am running a Chi-Square but the pretest criterion n≥5 per cell minimum was not satisfied. Chi-Square Tests Value df Asymptotic...

    Started by Anna II‎, Today 10:10 AM
    • Replies: 3
    • Views: 49
    Today, 01:39 PM Go to last post
  3. Variance of estimator of expectation

    Hello guys! This will probably be an easy one for you. I would like to find out how to get from the first to the second line of the equation. I...

    Started by Lorres‎, Yesterday 04:27 PM
    • Replies: 2
    • Views: 94
    Today, 11:54 AM Go to last post
  4. Bootstrapping and Independent T Tests

    Dear all, My question is whether it is appropriate to use Independent T Tests on distributions generated through bootstrapping. To be more...

    Started by TonyDonkin‎, Today 09:16 AM
    bootstrap, diversity index, hrel, independent t test
    • Replies: 1
    • Views: 45
    Today, 11:01 AM Go to last post
  5. Question one way ANOVA or paired t test?

    Apologies if this is a basic question, but my stats is very rusty these days! Background: I'm looking at a procedure that automates FISH analysis...

    Started by SM1987‎, Today 08:20 AM
    anova, biology, clinical, genetics, statistics
    • Replies: 0
    • Views: 31
    Today, 08:20 AM Go to last post
  6. Need help with an assignment (regarding ANOVA)

    Hi everyone, im doing a project in a statistics class where im supposed to apply more appropriate methods than those that are being used to answer...

    Started by KarenArnars‎, Yesterday 12:58 PM
    • Replies: 2
    • Views: 103
    Today, 06:17 AM Go to last post
  7. Anova Repeated Measures?

    Dear Stats Gurus, I have the following problem. I want to count the number of bubbles in a cup of water and I have 3 methods of doing it. The way...

    Started by pedro90‎, Yesterday 11:02 AM
    • Replies: 1
    • Views: 67
    Today, 04:22 AM Go to last post
  8. To correct or not to correct (Bonferroni?).

    Say we are comparing a control group and an active group. We are interested in the time to an event in these groups. The times are not normally...

    Started by Prometheus‎, Yesterday 07:39 AM
    • Replies: 6
    • Views: 116
    Yesterday, 01:40 PM Go to last post
  9. Permanova

    Hello, I think I need your help. I have done a study which is very easy to understand. Th design looks like this: o x o o o I did some...

    Started by gillingham‎, 11-20-2017 07:06 AM
    • Replies: 3
    • Views: 111
    11-20-2017, 05:45 PM Go to last post
  10. a question for statistical analysis

    I'm currently trying to analysis the price. but the price cannot satisfy the central limit theory because the number of people who summit the price....

    Started by seoulm88‎, 11-20-2017 12:37 AM
    • Replies: 1
    • Views: 106
    11-20-2017, 10:53 AM Go to last post
  11. is my stats right, trying to solve a risk of failure problem

    Hi, can you help me with this problem? My stats is 40 years out of date, and I have volunteered to solve this problem. Are my stats right? Is the...

    Started by bitofaproblem‎, 11-19-2017 12:20 PM
    • Replies: 0
    • Views: 101
    11-19-2017, 12:20 PM Go to last post
  12. Question X-squared test, relevance: URGENT ADVICE PLS

    Good evening everyone! I would need some help from you regarding X-squared test and its interpretation. The table below (also attached in a...

    Started by Sttepanka‎, 11-15-2017 06:24 PM
    • Replies: 8
    • Views: 244
    11-18-2017, 01:59 AM Go to last post
  13. Post What simple stats test to use?

    Hello everyone I need some help confirming what kind of stats tests to run on some data I've collected. I'm looking at three different...

    Started by Jamesbaldry‎, 11-16-2017 03:02 PM
    • Replies: 11
    • Views: 261
    11-18-2017, 12:16 AM Go to last post
  14. Does anyone know how to work with Motor Evoked Potentials (MEPs)?

    Dear all, I am working for the first time with Transcranial Magnetic Stimulation and Motor Evoked Potentials (MEPs). I am recording MEPs'...

    Started by kobebest‎, 11-17-2017 12:02 PM
    cognitive, mep, normalization, tms
    • Replies: 0
    • Views: 99
    11-17-2017, 12:02 PM Go to last post
  15. Interpretation of log transformed first differences in SVAR models

    I am working with a structural VAR analysis, and want to understand my results. The model studies how a shock on one variable affects a second...

    Started by agecon‎, 11-17-2017 08:50 AM
    first difference, interpretation, svar, time series
    • Replies: 0
    • Views: 112
    11-17-2017, 08:50 AM Go to last post
  16. Which Statistical Test To Use?

    Hi there, I have some data which I am not sure how to analyze/present. I am measuring % colonies of cells. I am calculating this as I have 240...

    Started by MikeK‎, 11-16-2017 08:03 AM
    • Replies: 1
    • Views: 145
    11-16-2017, 09:33 AM Go to last post
  17. Confidence Intervals. Why Just One Sample?

    A typical problem in a Stat Textbook for creating a confidence Interval sounds like this: A sample of 50 blood pressures is taken and the sample has...

    Started by TheStatProf‎, 11-15-2017 04:03 PM
    confidence intervals
    • Replies: 4
    • Views: 131
    11-15-2017, 09:49 PM Go to last post
  18. Question Null Hypothesis - Alternative Hypothesis - T-test

    Dear Stats-friends! I have an issue with formulating the null hypothesis, the alternative hypothesis, and performing the appropriate t-test...

    Started by Sttepanka‎, 11-14-2017 06:00 PM
    • Replies: 0
    • Views: 140
    11-14-2017, 06:00 PM Go to last post
  19. How to do power analysis

    I want to do power analyses prior doing statistical tests on data to assess for the power it would yield. It mostly is survival data. I want to use...

    Started by Kweetvannix‎, 11-14-2017 08:07 AM
    cox, cox proportional hazard, kaplan meier, kaplan meier survival, survival
    • Replies: 1
    • Views: 141
    11-14-2017, 09:55 AM Go to last post
  20. regroup and count cases within string variables

    My dataset of 13000 patients has four variables to describe specific treatments they have received. The treatment variables are set up as string...

    Started by bigdatasucks‎, 11-13-2017 10:03 PM
    • Replies: 0
    • Views: 135
    11-13-2017, 10:03 PM Go to last post
  21. Derive Sargan Statistics for 2SLS

    Hello. I am trying to show that the Sargan statistics of a classical linear 2SLS estimation can be expressed as the form nR^2, assuming...

    Started by Achung17‎, 11-13-2017 10:35 AM
    2sls regression mode, instrumental variable, r-squared, sargan
    • Replies: 0
    • Views: 117
    11-13-2017, 10:35 AM Go to last post
  22. Need help with analysis

    Hey guys, am currently doing a research on safety and health awareness among employees. for my questionnaire, i have asked questions related to...

    Started by kai123‎, 11-13-2017 02:31 AM
    • Replies: 1
    • Views: 131
    11-13-2017, 03:52 AM Go to last post
  23. Zero order correlation negative, Direct effect Positive

    Hi, I am performing mediation analysis, and have first of all looked at the correlation between variables. The zero order correlation between...

    Started by EmmaL‎, 11-12-2017 03:55 AM
    correlation, mediation
    • Replies: 1
    • Views: 138
    11-12-2017, 04:42 PM Go to last post
  24. Lightbulb Formula for the Confidence interval?

    Formula for the Confidence interval, assuming for a Sample whose standard deviation is same as Population. I need to know the exact formula. I...

    Started by khaled2reza‎, 11-11-2017 07:10 AM
    • Replies: 8
    • Views: 205
    11-12-2017, 03:43 AM Go to last post
  25. Test Statistic, how to?!

    x 1, 2, 3, 4, 5 y 35, 14, 21, 28, 7 The book says the test statistic is -1.30 I am getting other answers through my TI 84 and Excel ...

    Started by Mozz‎, 11-11-2017 03:45 PM
    • Replies: 4
    • Views: 191
    11-11-2017, 07:43 PM Go to last post
  26. What is the most suitable test for survival data?

    I have a data set of two groups of individuals that I want to compare. The data contains who survived and who didn't after 40 days and after 1 year....

    Started by Royan‎, 11-07-2017 08:06 AM
    survival analysis
    • Replies: 10
    • Views: 266
    11-11-2017, 03:25 PM Go to last post
  27. Three way interaction with Process (Hayes).

    I'm going to do a three way interaction in Spss with Process. And I was wondering if you guys could help me explain whats happening behind the scenes...

    Started by spssfreak‎, 11-10-2017 06:08 AM
    process, spss
    • Replies: 0
    • Views: 117
    11-10-2017, 06:08 AM Go to last post
  28. Chi-square post hoc tests?

    Hi there! So I've been testing a drug to see if it had any effect on the presence of a specific chromosome abnormality. There were 4 drug...

    Started by ilikthebred‎, 11-09-2017 07:26 AM
    • Replies: 3
    • Views: 163
    11-09-2017, 10:36 AM Go to last post
  29. Acceptable Ppk in relation to confidence/reliability

    Hi All, Most of the acceptance criteria that my team works with is based around a given confidence/reliability interval that needs to be met....

    Started by Cailin‎, 11-08-2017 01:51 PM
    • Replies: 2
    • Views: 153
    11-09-2017, 10:33 AM Go to last post
  30. Question AR(p) model starting values?

    I'm trying to understand the AR(p) time series model, but something is really confusing me. For example, let's consider an AR(2) model on {X(t):...

    Started by kingwinner‎, 11-07-2017 11:21 PM
    • Replies: 0
    • Views: 113
    11-07-2017, 11:21 PM Go to last post
  31. The Unexpected and Thrilling life of Grass - A Statistical Story

    Hi, I'm an aspiring Environmental Scientist and i've recently finished some data collection to do with Common Grassland Species. My hope was to...

    Started by ImmortalTraveller‎, 11-07-2017 08:34 PM
    paired, sample, science
    • Replies: 0
    • Views: 65
    11-07-2017, 08:34 PM Go to last post
  32. Statistics on fold change

    Hi everyone, I have been doing a biological experiment on three different days and I get this type of results: Day 1: Condition A: 2...

    Started by STAlexis‎, 11-07-2017 05:17 PM
    • Replies: 0
    • Views: 110
    11-07-2017, 05:17 PM Go to last post
  33. using glimmix for multi-level modeling

    I have a question about how to conduct multi-level analysis in glimmix. I have administered a peer nomination survey to a group of elementary...

    Started by charles matthew‎, 11-07-2017 12:22 PM
    glimmix, multi-level analysis, nested design, sas
    • Replies: 2
    • Views: 122
    11-07-2017, 02:24 PM Go to last post
  34. Question Multilple 2x2 tables

    Please, bear with me if this is too stupid. Let's have a basket with 400 balls. Clairvoyant claims she can guess which balls we take out without...

    Started by XIS‎, 11-07-2017 02:11 PM
    • Replies: 0
    • Views: 91
    11-07-2017, 02:11 PM Go to last post
  35. Which test should I use?

    Hey everyone, I would like to determine if there is a difference between two sets of data. The data is from two separate treatment groups on...

    Started by dcprzz‎, 11-06-2017 07:26 PM
    • Replies: 3
    • Views: 214
    11-07-2017, 08:06 AM Go to last post
  36. Need help with analytic plan

    Hi :) So i have collect data for my project and doesnt know what to do with the analytic plan. This is for my psychology assignment. Subjects:...

    Started by arixpoma‎, 11-06-2017 05:08 PM
    • Replies: 0
    • Views: 140
    11-06-2017, 05:08 PM Go to last post
  37. ? Correct research analysis

    Hello I am currently applying for research ethics for a project however i cannot get my head around the correct statistical analysis for my...

    Started by Jandrew‎, 11-06-2017 11:56 AM
    analysis, research design
    • Replies: 0
    • Views: 105
    11-06-2017, 11:56 AM Go to last post
  38. Post Urgent

    Foot locker uses sales per square foot as a measure of store productivity.Sales are currrently running at an annual rate of 406$ per square foot.You...

    Started by Erlanism‎, 11-06-2017 03:28 AM
    • Replies: 0
    • Views: 167
    11-06-2017, 03:28 AM Go to last post
  39. Correlation Project

    How does this sound for a project? Cost of non-organic food products vs. cost of same organic food products. What items should be included in the...

    Started by TheStatProf‎, 11-05-2017 05:23 PM
    correlation regression, project
    • Replies: 0
    • Views: 148
    11-05-2017, 05:23 PM Go to last post
  40. sample size

    Hi everyone, I do my research to see the association of 2 qualitative variables which make 2x3 contingency table. I calculate the required sample...

    Started by saitharndham‎, 11-03-2017 01:39 AM
    sample sizes
    • Replies: 3
    • Views: 286
    11-05-2017, 02:23 PM Go to last post
  41. Is there a name for this phenomenon in statistics?

    TL;DR: If you have two normally distributed populations that are identical except that one of them has an advantage in its mean, then as you move to...

    Started by bruin‎, 11-05-2017 11:32 AM
    • Replies: 0
    • Views: 186
    11-05-2017, 11:32 AM Go to last post
  42. Empirical Survivor Function (esf)

    From page 26, chapter 2 of the reference "Tableman, M., & Kim, J. S. (2003). Survival analysis using S: analysis of time-to-event data. CRC press", I...

    Started by Cynderella‎, 11-05-2017 12:11 AM
    empirical distribution, probability, references, statisitcs, survival analysis
    • Replies: 1
    • Views: 136
    11-05-2017, 03:37 AM Go to last post
  43. error in SPSS output

    Hello, I am using ANOVA to compare the variable means of 3 groups (N-52), but keep receiving a warning error in SPSS output - "Post Hoc tests are...

    Started by bobrose‎, 03-28-2012 11:06 AM
    • Replies: 8
    • Views: 25,544
    11-05-2017, 01:11 AM Go to last post
  44. What is the minimum sample size for this setting?

    I have several mazes. They have one entry point and one exit. Some are ridicilously easy, some are really hard, some do not have a solution. My...

    Started by Throndor‎, 11-03-2017 03:43 PM
    • Replies: 0
    • Views: 157
    11-03-2017, 03:43 PM Go to last post
  45. Red face Diff in Diff -> what is the minimum amount of treated observations?

    Can I use Diff in Diff when I only have a single treated observation? The case is that I observe the changes of a tax reform on real estate sales on...

    Started by velyf‎, 11-01-2017 04:47 PM
    difference in difference, observations
    • Replies: 1
    • Views: 182
    11-02-2017, 10:41 AM Go to last post
  46. Non linear mixed effects model and autocorrelation

    Hello everyone ! I am working on a non-linear statistical mixed effects model using package nlme in the R software.. The response variable is a...

    Started by Benlo‎, 11-02-2017 07:11 AM
    • Replies: 0
    • Views: 117
    11-02-2017, 07:11 AM Go to last post
  47. Dependent Samples T-test - different formulas?

    I have a question regarding hypothesis testing when the samples are not independent. The formula I know for the test statistic for a paired...

    Started by stattercat‎, 10-30-2017 08:12 AM
    • Replies: 4
    • Views: 295
    11-02-2017, 04:28 AM Go to last post
  48. Expected Frequencies Question

    Hey, I'm having trouble with the following question: What is the expected frequency for outcome 1 under drug A for the following table if we...

    Started by Br3ndan‎, 10-28-2017 12:29 PM
    • Replies: 2
    • Views: 201
    11-01-2017, 11:18 PM Go to last post
  49. Effect of insignificant p-value on capability calculation?

    Hi, I have a coworker who analyzed a data set with the goal of generating it's Cpk. Because the data set p-value was less than .05 for all...

    Started by Cailin‎, 11-01-2017 08:05 AM
    • Replies: 5
    • Views: 216
    11-01-2017, 12:13 PM Go to last post
  50. Weighted Volatility for Options Pricing

    Hi, I am trying to weight implied volatility for options by business day rather than by calendar day (and subsequently assign different weights to...

    Started by tksts‎, 10-31-2017 09:20 AM
    • Replies: 0
    • Views: 151
    10-31-2017, 09:20 AM Go to last post
  51. Calculating representative value for data

    Assume there are ten data with values a_1, a_2, ..., a_10 each with different non-symmetric errors. The problem confronting me in brief is, to...

    Started by puma31‎, 10-28-2017 11:58 AM
    chi square, data analysis, non-parameteric, statistical analysis
    • Replies: 3
    • Views: 240
    10-29-2017, 01:18 PM Go to last post
  52. Correlation in questionnaire data

    Hello, I'd really appreciate if someone can help me with a particular problem, concerning the approach I should take in statistically analysing...

    Started by Slightlybonkers‎, 10-29-2017 06:09 AM
    correlation, pearson, questionnaire, scatter plot
    • Replies: 0
    • Views: 106
    10-29-2017, 06:09 AM Go to last post
  53. Are small-n significant results "less reliable"?

    I've heard this claim a lot in online discussions, but it's usually less than clear what the person means, or even if they know what they are talking...

    Started by bruin‎, 10-29-2017 12:49 AM
    • Replies: 0
    • Views: 166
    10-29-2017, 12:49 AM Go to last post
  54. Calculating ensemble value for data with non-gaussian errors

    I have 10 data points each of which have non-symmetric (i.e., non-Gaussian) errors. That is, if 'a' is the central value (representing the median),...

    Started by puma31‎, 10-27-2017 05:55 PM
    chi square test, hypothesis testing, kolmagorov-smirnoff, non normal distribution, statistical analysis
    • Replies: 12
    • Views: 340
    10-28-2017, 10:15 AM Go to last post
  55. Post a question about Wilcoxon Signed- Rank tests

    Hi, I have a question about if Wilcoxon Signed- Rank the test is appropriate for testing the ranking of different attributes for one varible in one...

    Started by nazila‎, 10-27-2017 07:37 PM
    • Replies: 0
    • Views: 111
    10-27-2017, 07:37 PM Go to last post
  56. Testing normality of distribution: Shapiro-Wilk's test/Levene's test?

    I have data from an experiment with 5 conditions. The goal is to compare the impact of treatment on dependent variables between the conditions. To...

    Started by luckycat‎, 10-26-2017 11:24 AM
    anova, kruskal wallis, levene's test, non-parametric anova, shapiro-wilk test
    • Replies: 5
    • Views: 250
    10-27-2017, 05:42 PM Go to last post
  57. How to present transformed data that shows individual data points

    Hello! This is my first post and I'm hoping to get some help on how to work with transformed data for a research publication I am writing up. ...

    Started by Lilhubb‎, 10-27-2017 02:01 PM
    backtransform, data, logarithmic, presentation, transformation
    • Replies: 0
    • Views: 163
    10-27-2017, 02:01 PM Go to last post
  58. How to interpret intercept and coefficient and significance (portfolio return French)

    Hi there! I am new to this forum and very happy for beeing able to ask for help here. I am currently struggling with an exercise which probably...

    Started by Statisticbeginner‎, 10-27-2017 05:50 AM
    • Replies: 0
    • Views: 135
    10-27-2017, 05:50 AM Go to last post
  59. Question about the "sigma" number in the likelihood scan

    Dear experts, I have a naive question w.r.t to the plot attached. As you can see, it is a likelihood scan plot with several dashed line...

    Started by WangZirui7‎, 10-27-2017 01:47 AM
    • Replies: 0
    • Views: 115
    10-27-2017, 01:47 AM Go to last post
  60. Post Validation of Data Quality

    Hi, Could you please share your inputs on how data can be validated for accuracy using statistical techniques? Could techniques like...

    Started by StatAim‎, 10-24-2017 07:06 PM
    • Replies: 3
    • Views: 287
    10-25-2017, 07:21 PM Go to last post

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