1. 10-14-2010
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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 11:13 AM
    • Replies: 1
    • Views: 105,322
    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: 31,199
    09-30-2005, 09:44 AM Go to last post
  1. PCA or clustering on binary data?

    Hello, I have a dataset consisting of around 30 species of plants (rows) and around 50 variables (my columns) that are medicinal properties of...

    Started by jk78‎, 10-06-2015 05:55 AM
    binary data, pca, principal component
    • Replies: 12
    • Views: 316
    Today, 04:36 AM Go to last post
  2. Comparing response to treatment across two separate *populations*

    Hi all, Forgive me if this seems a straightforward question but ive tried in vain to find the answer. I'm doing a medical research project and want...

    Started by Dalach‎, 10-10-2015 08:00 AM
    • Replies: 3
    • Views: 149
    Today, 02:35 AM Go to last post
  3. Sample Size Estimation for Dependent or Independent Groups?

    Hey everyone, I am new to this so please bear with me. I have been discussing a question with my fellow peers regarding sample size estimation....

    Started by Bananas‎, Yesterday 01:54 PM
    • Replies: 1
    • Views: 90
    Yesterday, 03:14 PM Go to last post
  4. Which statistical test?

    I am returning to statistics after a gap of a few years, I was never confident before and seem to be really struggling now! I was wondering if...

    Started by newtostats2‎, Yesterday 11:17 AM
    • Replies: 7
    • Views: 154
    Yesterday, 12:20 PM Go to last post
  5. Test to prove if two products are same

    We have a food company where we produce multiple products on the same machine. For shelf life analysis we are selecting 3 packages from each product...

    Started by Myconservator‎, 10-11-2015 03:17 PM
    • Replies: 2
    • Views: 124
    Yesterday, 09:51 AM Go to last post
  6. Which Statistical Test?

    I have been given a rather difficult scenario to interpret and based on the information, must determine the appropriate statistical test to use based...

    Started by statnewbie389‎, 10-11-2015 01:27 PM
    • Replies: 3
    • Views: 119
    Yesterday, 08:35 AM Go to last post
  7. interpreting layered chi square output

    Hello, I was wondering if anyone could help with interpretation of a layered chi square table to look for a confounding variable I am getting...

    Started by derekcruise‎, 10-11-2015 08:09 AM
    • Replies: 9
    • Views: 169
    Yesterday, 04:37 AM Go to last post
  8. Covariance same as standard score and raw score?

    I have a problem in which we have to compute the correlation coefficient, using the standard score formula, covariance formula, and the raw score...

    Started by JWade‎, 10-11-2015 03:24 PM
    • Replies: 0
    • Views: 72
    10-11-2015, 03:24 PM Go to last post
  9. Cramers V after Chi square test

    Hi, I was told to use a Chi square test with Cramers V. Do I only use Cramers V as a post-test if the Chi square test is significant? Thank you!

    Started by MAGA‎, 10-07-2015 12:18 PM
    • Replies: 6
    • Views: 217
    10-11-2015, 09:28 AM Go to last post
  10. Normal Distribution, probability of a certain value

    Hi, does anyone know how to do this question? I am really struggling... I know how to find the probability of someone coming within 8 minutes of...

    Started by Zazu‎, 10-10-2015 08:26 PM
    • Replies: 1
    • Views: 55
    10-11-2015, 07:07 AM Go to last post
  11. Analysis of residues

    Let Y_i the observed values \hat{Y_i} the fitted values and e_i the residues, for i=1,2,3,4,5. Then we have Y=(35,17,42,28,53) and...

    Started by askazy‎, 10-10-2015 09:03 PM
    • Replies: 1
    • Views: 84
    10-11-2015, 06:56 AM Go to last post
  12. Exclamation PASW scatterplot

    http://imgur.com/GldQa3Y This looks to me like a negative correlation, but how do I justify it in the answers...? c doesn't seem to make...

    Started by Zazu‎, 10-10-2015 09:16 PM
    • Replies: 1
    • Views: 84
    10-11-2015, 02:33 AM Go to last post
  13. SPSS interpretation

    Is the answer to this (http://imgur.com/GldQa3Y) a? I am extremely confused... What does sig(2 tailed) mean...? Thanks :)

    Started by Zazu‎, 10-10-2015 09:06 PM
    • Replies: 0
    • Views: 66
    10-10-2015, 09:06 PM Go to last post
  14. Full and reduced model in linear Regression

    The normal error regression model is Y_i=B_0+B_1X_i+\epsilon_i where \epsilon_i\sim N(0,\sigma^2) and the reduced model is Y_i=B_0+\epsilon_i . I...

    Started by askazy‎, 10-10-2015 04:34 PM
    • Replies: 1
    • Views: 88
    10-10-2015, 07:09 PM Go to last post
  15. Median and quartiles

    Hello dear mates; WHY the value of median and quartiles are non-unique ? thank you

    Started by ahmed.mazari‎, 10-09-2015 10:13 AM
    • Replies: 2
    • Views: 99
    10-09-2015, 03:13 PM Go to last post
  16. Question ANCOVA and stratified sample

    Hello folks! I want to measure the effect of an intervention (dummy variable) on a continuous variable in a controlled intervention trial. I...

    Started by Marc_lux‎, 10-07-2015 09:44 AM
    • Replies: 2
    • Views: 144
    10-09-2015, 10:50 AM Go to last post
  17. P Stat Help

    I'm having a hard time understanding the calculation of the P stat. I simply have a sample where the expected outcome is 50/50. In this case, 81 of...

    Started by jasonlina‎, 10-08-2015 02:01 PM
    • Replies: 2
    • Views: 100
    10-09-2015, 10:16 AM Go to last post
  18. Comparing 2 Means with STDev and Sample Size

    Hi there, I am trying to compare the means of 2 independent samples to determine if there is a difference between them or not. I have the mean,...

    Started by TTest1776‎, 10-08-2015 04:01 PM
    • Replies: 1
    • Views: 105
    10-09-2015, 06:41 AM Go to last post
  19. Regression model with normal error

    In a small-scale regression study, five observations on Y were obtained corresponding to X = 1,4,10, 11, and 14. Assume that \sigma=0.6,B_0=5,B_1=3...

    Started by askazy‎, 10-07-2015 05:50 PM
    variance in estimates
    • Replies: 6
    • Views: 223
    10-09-2015, 01:05 AM Go to last post
  20. Standard Deviaton/Unusual (ScreenShot Included)

    I dont understand how this is wrong? I need help, I have sat here looking over it for an hour

    Started by cbitez‎, 10-08-2015 04:20 PM
    • Replies: 0
    • Views: 77
    10-08-2015, 04:20 PM Go to last post
  21. What is the proper test to use for this study?

    It's been too long since I have taken a stats course, and I'm struggling to figure out what the proper test is for this experiment I'm designing. ...

    Started by Jordan901‎, 10-08-2015 04:19 PM
    • Replies: 0
    • Views: 107
    10-08-2015, 04:19 PM Go to last post
  22. Determine sample size and frequency for long term permanent monitoring monitoring

    Hello, I have five years of annual plant count census data from 214 permanent sampling plots. These are complete counts of a single plant species...

    Started by AndyBid‎, 10-08-2015 03:20 PM
    • Replies: 0
    • Views: 66
    10-08-2015, 03:20 PM Go to last post
  23. Post Clustering - Average Linking method

    Dear community, currently, I am spending my time with the average linking method but actually I don't really understand it. I know HOW to link the...

    Started by roberto123‎, 10-08-2015 09:25 AM
    • Replies: 1
    • Views: 93
    10-08-2015, 12:36 PM Go to last post
  24. Estimating Failure Rate: Chi-Square v Poisson

    I understand Poisson distribution is for discrete events and can be used to estimate failure rate to a given confidence level from elapsed time and...

    Started by HTDearden‎, 10-08-2015 10:35 AM
    chi-squared, failure rate, poisson
    • Replies: 0
    • Views: 70
    10-08-2015, 10:35 AM Go to last post
  25. Statistical Test - Which one

    Hello everyone, I want to make one analysis to understand the behaviour of some stores: if there are some similars, which one are similars, etc. ...

    Started by Sparta‎, 10-08-2015 09:28 AM
    statistical test
    • Replies: 0
    • Views: 72
    10-08-2015, 09:28 AM Go to last post
  26. Ratio of Means - appropriate test for single or multiple comparisons? Fieller's CI?

    I would really appreciate any suggestions with the following data analysis issue. Please read till the end as the problem at first may appear...

    Started by biophysics‎, 05-06-2013 12:18 AM
    comparison, confidence interval, overlapping, ratio of means, tests of significance
    • Replies: 8
    • Views: 892
    10-07-2015, 12:25 PM Go to last post
  27. Joint Distribution

    Hi everyone, I've got a problem with a joint probability density function question. Given f(x, y) = e^-(x+y), 0 <= x < ∞ , 0 <= y < ∞ , and...

    Started by adegroat‎, 10-07-2015 01:48 AM
    joint density function, joint distribution
    • Replies: 0
    • Views: 96
    10-07-2015, 01:48 AM Go to last post
  28. z-score within participants before or after averaging conditions

    Hi, I have a Group(2) x Condition(5) ANOVA design. Group is a between factor and Condition is within. I'm specifically interested in interaction...

    Started by Catarina‎, 10-06-2015 08:40 PM
    anova, z-scores
    • Replies: 0
    • Views: 89
    10-06-2015, 08:40 PM Go to last post
  29. Post ANCOVA with more than 2 covariates. homogeneity of regression slopes.

    Hello, I am carrying out a ANCOVA with more than 2 covariates with SPSS. I want to check the homogeneity of regression slopes to confirm the...

    Started by tt123456‎, 10-06-2015 04:13 AM
    ancova, homogeneity of slopes, more than 2 covariates, spss
    • Replies: 2
    • Views: 158
    10-06-2015, 08:16 PM Go to last post
  30. Manually calculate Tamhane T2

    As a hobby I like to replicate SPSS output I sometimes come across in Excel, using basic functions. Now I've been searching everywhere how to...

    Started by blubblub‎, 10-06-2015 11:45 AM
    • Replies: 0
    • Views: 111
    10-06-2015, 11:45 AM Go to last post
  31. Which statistical test should I use?

    So here's what I got: I have the odds of detecting a particular native amphibians species during surveys. This is broken down by whether or not a...

    Started by skybutton‎, 08-02-2015 12:48 PM
    • Replies: 13
    • Views: 621
    10-05-2015, 01:37 PM Go to last post
  32. Econometrics Questions Help PLEASE

    I am having a hard time with proofs in econometrics (as i think alot do) but I would really appreciate some help into these questions 1) y= Bo +...

    Started by skg94‎, 10-04-2015 06:48 PM
    • Replies: 7
    • Views: 181
    10-05-2015, 12:57 PM Go to last post
  33. Is Kruskal Wallis really needed?

    Dear all, I really do not see why we need Kruskal-Wallis test at all. In terms of the distribution, only platykurtic distribution may increase...

    Started by rezzak‎, 10-05-2015 04:54 AM
    anova assumption, kruskall-wallis
    • Replies: 2
    • Views: 146
    10-05-2015, 08:36 AM Go to last post
  34. How to calculate sample size using spss

    I want to calaculate sample size of 150 population using SPSS. Please explain

    Started by neha_sharma‎, 10-05-2015 05:11 AM
    • Replies: 0
    • Views: 89
    10-05-2015, 05:11 AM Go to last post
  35. Probability Question

    Hello, So I have a question that I thought I did right but in reality, was wrong. The question goes as followed: Suppose I give you a list of 20...

    Started by ssx‎, 10-04-2015 08:08 PM
    • Replies: 3
    • Views: 156
    10-05-2015, 03:38 AM Go to last post
  36. Filtering hostility from survey

    This is not directly related to statistics, but is a problem that stops one from getting good statistics. And pprobably every single person who works...

    Started by MHope‎, 10-04-2015 10:49 AM
    • Replies: 2
    • Views: 128
    10-05-2015, 01:26 AM Go to last post
  37. Finding relationships between 3 or more variables?

    Hello, Total newbie here - but I'm hoping someone can help me out. I have finished running a multiple regression analysis and have my results....

    Started by Tzo‎, 10-04-2015 03:33 PM
    • Replies: 0
    • Views: 104
    10-04-2015, 03:33 PM Go to last post
  38. Generating random samples and finding the distribution of test statistic

    I generated 600 random samples from a normal distribution with mean 10 and standard deviation 5. Then I broke apart this vector into 100 groups with...

    Started by stat_ring‎, 10-03-2015 01:09 PM
    • Replies: 2
    • Views: 224
    10-04-2015, 12:28 PM Go to last post
  39. Sign Test Problem how to solve?

    A physical instructor claims that a particular exercise when done continuously for 7 days,reduces body weight at least by 3.5kg. Five overweight...

    Started by shrumadhu‎, 10-03-2015 06:48 AM
    • Replies: 4
    • Views: 227
    10-04-2015, 01:49 AM Go to last post
  40. Help with Bayesian statistics using R

    I need help as I have absolutely no idea where or how to start. I haven't learnt anything about this topic but am doing practice question for next...

    Started by lotus‎, 10-03-2015 08:29 AM
    • Replies: 0
    • Views: 137
    10-03-2015, 08:29 AM Go to last post
  41. Correct SD for between-groups Cohens d, when variable is a difference between means

    Hi all, Im working on a meta-analysis using effect sizes, and trying to integrate other researcher's data. I have a question I am hoping to clarify,...

    Started by axemann‎, 10-03-2015 02:08 AM
    • Replies: 0
    • Views: 122
    10-03-2015, 02:08 AM Go to last post
  42. Needing help for the correct statistics to use...

    Hi, all! I am a newbie to this site and am super limited on my stats knowledge. I have a project that is being done that requires statistical...

    Started by Strawberryd‎, 10-02-2015 12:24 PM
    • Replies: 4
    • Views: 187
    10-02-2015, 04:14 PM Go to last post
  43. Pre-requisites for learning R

    Hi experts, So i recently started learning R but looks like its tough for me. Are there any essential languages to learn before jumping into the R....

    Started by scuby‎, 10-02-2015 10:02 AM
    • Replies: 2
    • Views: 132
    10-02-2015, 10:22 AM Go to last post
  44. Chi-square test. 87,5% have expected count less than 5

    Hi, 4x4 table. What should I do when over 20 % of the cells have expected count less that 5? What other statistic analyse is recomended?...

    Started by Magne‎, 10-02-2015 08:21 AM
    • Replies: 2
    • Views: 136
    10-02-2015, 08:40 AM Go to last post
  45. How to compare percentages?

    I have no experience in statistics whatsoever and would really appreciate some help with how to compare percentages. I have a patient group (n77) and...

    Started by thermarb‎, 09-30-2015 09:11 AM
    • Replies: 2
    • Views: 146
    10-02-2015, 02:37 AM Go to last post
  46. linear probability models: heteroscedasticity

    I have to run linear probability models rather than logistic regression models (dichotomous endogenous variable) and I am wanting to look for a way...

    Started by Lazar‎, 10-01-2015 06:27 PM
    inear probability model
    • Replies: 10
    • Views: 275
    10-02-2015, 01:01 AM Go to last post
  47. Post Similarity, Dissimilarity Test

    Hello all, I am a graduate student. For my research, I am dealing with traffic data of different time period (such as June 2014 vs July 2015) of the...

    Started by Mudasser_Seraj‎, 10-01-2015 01:56 PM
    • Replies: 4
    • Views: 213
    10-01-2015, 07:13 PM Go to last post
  48. Question How to compare ranked list items

    I have compiled a survey asking respondents to rank social media by the amount of time they spend on each of 10 platforms. So if, for example, I...

    Started by Dumbasadog‎, 09-30-2015 05:37 PM
    • Replies: 4
    • Views: 226
    10-01-2015, 02:04 PM Go to last post
  49. Question Time Series (Random Walk?)

    I just recently started to learn about moving average process of order 1, however, I get confused if there are other things attached to the equation....

    Started by Asano Kyouya‎, 09-30-2015 11:48 AM
    • Replies: 0
    • Views: 141
    09-30-2015, 11:48 AM Go to last post
  50. Question Time Series (White Noise)

    Suppose W_t and Y_t are two independent normal white noise series with Var(W_t)=2Var(Y_t)=4. Let X_t = W_t-0.5W_{t-1} and...

    Started by Asano Kyouya‎, 09-30-2015 11:43 AM
    time-series, white noise
    • Replies: 0
    • Views: 131
    09-30-2015, 11:43 AM Go to last post
  51. Lightbulb Hypothesis test for a Proportion

    The Digital New Zealand 2014 report also reports on a survey into who is playing games in New Zealand. The survey collected data from 2,377...

    Started by francistang‎, 09-29-2015 09:11 PM
    • Replies: 1
    • Views: 202
    09-30-2015, 08:16 AM Go to last post
  52. Control Chart help - Determining if it's in control or not

    Hello all. I need help for this assignment. Here I have 3 different control charts. My assignment is to determine if they are in statistical control...

    Started by ineedhelpwiththis29‎, 09-29-2015 10:45 PM
    • Replies: 1
    • Views: 142
    09-30-2015, 06:39 AM Go to last post
  53. Implications of non fully randomised design for ANOVA: How do I deal with problem

    Hello, I'm a student attempting my first horticulture type experiment with a class mate and although we thought we had done enough reading to set-up...

    Started by Russ‎, 09-29-2015 09:41 PM
    • Replies: 1
    • Views: 140
    09-29-2015, 09:50 PM Go to last post
  54. When should a time series model be used

    Consider the following scenario: i have a set of responses y(t),y(t-1),.....y(1), where Y's are continuous and fall between , and "t" is the...

    Started by pemfir‎, 09-29-2015 09:02 PM
    regression analysis, time series forecast, time series regression
    • Replies: 0
    • Views: 108
    09-29-2015, 09:02 PM Go to last post
  55. Create new variable in R dataframe by counting values equal to or greater than 1

    Hi, I have a dataframe in which I need to create a new column by counting all values equal to or greater than 1 occurring row-wise. I tried to use...

    Started by ps1993‎, 09-29-2015 03:17 PM
    counting, dataframe, software r, variables
    • Replies: 1
    • Views: 190
    09-29-2015, 08:11 PM Go to last post
  56. Negative Binomial Panel Regression Model cannot be fitted

    Hello everybody, I have a question: one of the negative binomial panel regression models I'm trying to calculate cannot be fitted - using Stata...

    Started by mrritz‎, 09-28-2015 01:04 PM
    • Replies: 0
    • Views: 174
    09-28-2015, 01:04 PM Go to last post
  57. Student software licenses for academic study

    I'm having a problem with a US stats software provider that insists on classifying PhD work as commercial if the student has any detectable...

    Started by BunnstromR‎, 09-25-2015 11:13 AM
    • Replies: 11
    • Views: 468
    09-26-2015, 04:30 PM Go to last post
  58. Confidence limits on occupant satisfaction in buildings

    Apologies to all if this is a chestnut of a question, but I've just joined TalkStats. Question: what is an appropriate confidence limit to apply...

    Started by BunnstromR‎, 09-25-2015 10:54 AM
    confidence limits, mean difference plots, occupant comfort, occupant perceptions
    • Replies: 0
    • Views: 148
    09-25-2015, 10:54 AM Go to last post
  59. Analysis for non mutually exclusive Categorical data

    I have 5 variables Y, A, B, C & D (4 are independent and 1 is dependent). Four variables (3 independent - A, B, C & D and 1 dependent - Y) are...

    Started by Mosima‎, 09-17-2015 08:19 AM
    • Replies: 14
    • Views: 534
    09-24-2015, 02:01 PM Go to last post
  60. 6 Widget Producing Machines - How often one machine produces the most/above average

    I'm looking to be able to calculate (not simulate) how often a sample from one distribution exceeds the sample of multiple other distributions. I am...

    Started by coursonb‎, 07-15-2015 10:20 PM
    • Replies: 3
    • Views: 309
    09-24-2015, 11:33 AM Go to last post

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