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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: 196,934
    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: 66,847
    09-30-2005, 09:44 AM Go to last post
  1. Comparing Likert scales of different lengths

    Hi there talkstats experts. For my thesis I am doing research about listener's attitudes towards 4 different Dutch accents. Next to that I also do...

    Started by Statischmics‎, 01-15-2013 08:45 AM
    compare groups, help me!, likert, scale
    • Replies: 1
    • Views: 2,271
    01-17-2013, 05:41 AM Go to last post
  2. Calculate Split based on two Criterias

    Good Morning, Please see the attached MS Excel sheet and help. This is my first time on this forum. If my question is not applicable to this...

    Started by rvc81‎, 01-17-2013 12:21 AM
    • Replies: 2
    • Views: 1,145
    01-17-2013, 01:09 AM Go to last post
  3. Percentage of data points in distribution

    Hello, I have a sample of data for which I have figured out that the population mean for the height of US 12-year-old children is μ = 150 cm with σ =...

    Started by josephinezupan‎, 01-16-2013 08:58 PM
    percentage, population mean, standard deviation
    • Replies: 1
    • Views: 1,405
    01-16-2013, 11:07 PM Go to last post
  4. Standard Deviation not Equal to Standard Error

    Question: If the standard deviation of a particular sample with size N is not equal to the standard error for samples of the same size. Can you...

    Started by josephinezupan‎, 01-16-2013 08:33 PM
    sample size, standard deviation, standard error
    • Replies: 1
    • Views: 2,434
    01-16-2013, 09:58 PM Go to last post
  5. Help me!

    What is the numerical value of the standard deviation of the following sample data? 45, 26, 36, 34, 24, and 29? Round your answer to the nearest...

    Started by duykhanh992‎, 01-16-2013 12:21 PM
    • Replies: 3
    • Views: 1,757
    01-16-2013, 04:01 PM Go to last post
  6. Can Process Capability Be Calculated Using Unilateral Tolerance ?

    Hello all. This is my first post, so please be gentle. First off, I am not a statistician in any way shape or form, however............ I am in...

    Started by cmmbob‎, 01-16-2013 02:59 PM
    • Replies: 0
    • Views: 2,146
    01-16-2013, 02:59 PM Go to last post
  7. Statistical hypothesis testing

    I was given this problem: If X is not normally distrubuted, but Y= sqrt(X) is: which hypothesetes tests are possible and explain why: H0:...

    Started by jones123‎, 01-16-2013 10:36 AM
    • Replies: 1
    • Views: 1,180
    01-16-2013, 10:49 AM Go to last post
  8. Multicollinearity with categorial variable

    Hey everyone, I am working on my statistical assignment for my regression class and I have encountered a problem. I have the dataset from library...

    Started by Theory‎, 01-16-2013 09:30 AM
    • Replies: 0
    • Views: 1,480
    01-16-2013, 09:30 AM Go to last post
  9. Unhappy Comparing two or more groups used different criteria

    Hy, In my work, I have to compare groups of users and see if there is a significant difference between them. So, I use parametric (Student, Anova)...

    Started by Kassouma‎, 01-15-2013 10:40 AM
    • Replies: 4
    • Views: 1,681
    01-16-2013, 08:58 AM Go to last post
  10. How robust is Pearson's Correlation to Normality violations?

    Hi Guys, I can't seem to find a definitive answer to this question: can one run a Pearson's correlation on data that is not normal (but has no...

    Started by Dwest‎, 01-16-2013 05:25 AM
    pearson correlation
    • Replies: 0
    • Views: 3,542
    01-16-2013, 05:25 AM Go to last post
  11. Exclamation Help needed interpreting phi - desperate!

    Hey everyone, I am in the process of finishing my master's thesis (strategic public relations). My thesis focuses on finding out what type of tweets...

    Started by jeanineguidry‎, 01-15-2013 10:18 PM
    • Replies: 1
    • Views: 2,259
    01-16-2013, 04:01 AM Go to last post
  12. Root mean square error

    Hi Guys, I am confused with the root mean square error of a regression. Is it actually the square root of the variance of the residuals of a...

    Started by bennji‎, 01-16-2013 03:28 AM
    • Replies: 0
    • Views: 647
    01-16-2013, 03:28 AM Go to last post
  13. Effect size for Nemenyi test

    Hello, I have been trying to find how to calculate the effect size for Nemenyi test (which is a nonparametric Tukey-type multiple comparisons). If...

    Started by GreenTea‎, 01-15-2013 07:38 PM
    • Replies: 0
    • Views: 1,455
    01-15-2013, 07:38 PM Go to last post
  14. Prediction with Residuals

    Hi I am a very beginner so sorry for the very simple questions. I have first a very general question regarding the linear regression. This...

    Started by Miau Piau‎, 01-15-2013 06:57 PM
    crossvalidation, regression, residuals
    • Replies: 0
    • Views: 1,016
    01-15-2013, 06:57 PM Go to last post
  15. Prediction using Time Series Techniques

    Hello all, I need some suggestion regarding Prediction using Time series techniques. I am using time series techniques to predict the future...

    Started by manishvrm‎, 01-15-2013 10:22 AM
    • Replies: 5
    • Views: 1,755
    01-15-2013, 12:46 PM Go to last post
  16. How to calculate this question, probability ?

    hello in my last exam statistics there was this question: A certain brand of batteries has a lifetime that has a normal distribution with a...

    Started by Bramm5‎, 01-15-2013 10:48 AM
    • Replies: 1
    • Views: 3,004
    01-15-2013, 11:30 AM Go to last post
  17. Spread of ordinal data

    Hi, I have used a 5 point likert scale (agree to disagree) in a survey and found that there was a central tendency bias where respondents scored a...

    Started by jamie157‎, 01-15-2013 06:40 AM
    • Replies: 4
    • Views: 1,512
    01-15-2013, 10:48 AM Go to last post
  18. Is it possible to calculate the F-statistic with means, SDs and sample sizes?

    Let's say we have two groups. Group A: mean = 5.5, sd = 1.2, n = 40 Group B: mean = 6.2, sd = .8, n = 45 With this information only, is it...

    Started by Klausk‎, 01-14-2013 11:35 PM
    • Replies: 2
    • Views: 1,641
    01-15-2013, 03:31 AM Go to last post
  19. Parametric tests on percentage change data?

    Hi, I've been searching around recently to check if I am able to use one way ANOVA (parametric tests) on percentage change data? The data is from...

    Started by jackithymia‎, 01-14-2013 11:45 PM
    anova, flow, parametric, percentage change
    • Replies: 1
    • Views: 2,885
    01-15-2013, 02:05 AM Go to last post
  20. Categorical Data and Cluster Analysis

    Hi All, New to the forum but thought it might be useful given how long it takes me to find something out via books and the internet! No substitute...

    Started by Hypoaroused‎, 01-14-2013 10:21 AM
    spss cluster categorical
    • Replies: 2
    • Views: 2,154
    01-15-2013, 01:56 AM Go to last post
  21. Trend beta coefficients of ordinal predictor

    I have made a few regression models in Stata using commands like: "regress continuousvariable i.ordinalvariable ..." I'd like a p-value for the...

    Started by mankar4‎, 01-14-2013 11:11 PM
    • Replies: 0
    • Views: 1,289
    01-14-2013, 11:11 PM Go to last post
  22. Calculate Cross-Sell Potential

    I'm having difficulty predicting cross-sell items... Given a 2 column dataset of order numbers and product SKUs, which test should I run to...

    Started by jsouths‎, 01-14-2013 06:27 PM
    • Replies: 3
    • Views: 2,208
    01-14-2013, 07:57 PM Go to last post
  23. Retail Formula to Compare Sales (simple?)

    For a thrift store, where all of product is essentially free... is there a way to tell me which sale was more successful? Sale 1 - a 50% OFF sale...

    Started by jamestown‎, 01-12-2013 11:33 PM
    • Replies: 3
    • Views: 1,506
    01-14-2013, 05:44 PM Go to last post
  24. charectristics of a data set for Standardizing

    Hi, for standardizing a data set or (x-mean)/variance we are assuming a Gaussian distribution for the data. What should we do to know that this...

    Started by Fred_a‎, 01-14-2013 11:14 AM
    • Replies: 2
    • Views: 1,115
    01-14-2013, 05:36 PM Go to last post
  25. Standardizing a normal variable

    I am trying to understand the binomial distribution, normal distribution and standard normal distribution using the attached excel file. The...

    Started by parixit‎, 01-14-2013 11:57 AM
    • Replies: 0
    • Views: 1,478
    01-14-2013, 11:57 AM Go to last post
  26. Most wins over time

    Hey, I am not very good at stats, but I have a question. Statistically speaking, if you could create a draw, with whatever amount of tickets...

    Started by statsp‎, 01-13-2013 03:09 PM
    stats, win
    • Replies: 7
    • Views: 1,917
    01-13-2013, 07:14 PM Go to last post
  27. t-test critical value approach both sigma and S unknown

    I apologise in advance if a similar question has been answered before but both on google and the forums I have had no luck due to the search terms....

    Started by bbombadi‎, 01-13-2013 04:46 PM
    • Replies: 3
    • Views: 4,859
    01-13-2013, 06:30 PM Go to last post
  28. ANOVA with percentages

    Hello -- I'm looking for some guidance on how to make my percentage data appropriate for ANOVA. Here is what I have: The dependent variable is a...

    Started by marika‎, 01-11-2013 02:44 PM
    • Replies: 10
    • Views: 12,026
    01-13-2013, 02:20 PM Go to last post
  29. Help with statistical significance testing and null/alternative hypothesis! thx

    In a clinical trail, 60 patients involved in a study, all of them are suffering from a brain injury. 30 patients got "NewDrug" and 30 got...

    Started by eladgro‎, 01-12-2013 04:44 PM
    • Replies: 5
    • Views: 1,742
    01-13-2013, 01:45 PM Go to last post
  30. Help with writing null/alternative hypothesis

    I need to assess the efficacy of the drug treatment by comparison with the placebo treated (basically what is better) by t-test unparied but I cannot...

    Started by eladgro‎, 01-13-2013 08:08 AM
    • Replies: 4
    • Views: 1,896
    01-13-2013, 01:43 PM Go to last post
  31. Which test to use

    Hi Everyone, This is my first post on this forum. I am new to SPSS, performing my first small research. I am doing a survey to find out the...

    Started by mohitgem‎, 01-13-2013 02:05 AM
    • Replies: 1
    • Views: 1,223
    01-13-2013, 08:17 AM Go to last post
  32. Nested ANOVA

    Hi all, Please help me to understand where is the mistakes. I have a nested ANOVA experiment that in minitab taht contains data from a study of gas...

    Started by PaulS‎, 01-13-2013 06:58 AM
    • Replies: 0
    • Views: 2,412
    01-13-2013, 06:58 AM Go to last post
  33. Covariance of Multinomial Trials

    The problem is to find the covariance of N_i and N_j where N_1, N_2,...,N_r are multinomial random variables. It is known that the marginal...

    Started by jstallin‎, 06-25-2009 04:49 PM
    • Replies: 1
    • Views: 10,240
    01-13-2013, 02:20 AM Go to last post
  34. Help with tasks

    Help with stata, i dont know how to solve this problems... it would be great if someone could help me ! ceosal1.dta

    Started by ger_11‎, 01-12-2013 08:20 PM
    • Replies: 0
    • Views: 1,991
    01-12-2013, 08:20 PM Go to last post
  35. Help with concordance correlation

    I have a clinical trail with 60 patients, suffering from a brain injury. I need to evaluate the concordance between the results of the study, as...

    Started by eladgro‎, 01-12-2013 05:46 PM
    • Replies: 1
    • Views: 1,385
    01-12-2013, 05:55 PM Go to last post
  36. wilcoxon signed-rank test to compare 2 pseudo-randomized distributions?

    Hello I need help to find the good statistic to use to compare two distributions of data coming from pseudo randomized trials. I have recorded...

    Started by guilhem‎, 01-09-2013 01:55 PM
    distribution comparison, distribution tests, randomization, wilcoxon signed-rank test
    • Replies: 1
    • Views: 2,113
    01-12-2013, 04:01 PM Go to last post
  37. Normalizing standard deviation

    Greetings! This is a simple question, I think, but one that I am too rusty now to deduce a clear answer to. If I have a mean (m) and associated...

    Started by Stubaan‎, 01-10-2013 06:26 PM
    • Replies: 3
    • Views: 25,040
    01-11-2013, 09:34 PM Go to last post
  38. how to add quantity information to boxplot

    Hello I am using boxplots to show the distribution of some data. However, some comments says the boxplot can not show the concentration quantity...

    Started by helenekuo‎, 01-11-2013 08:36 PM
    boxplot, quantity
    • Replies: 1
    • Views: 2,240
    01-11-2013, 09:26 PM Go to last post
  39. Gentrification Data

    Hello, I am developing a masters thesis which will attempt to utilize census tract data to assess the occurrence of gentrification in Washington,...

    Started by mryan13‎, 01-11-2013 07:31 PM
    attributes, d.c., gentrification, statistics, washington
    • Replies: 0
    • Views: 1,244
    01-11-2013, 07:31 PM Go to last post
  40. Type II Error Rate

    Any help greatly appreciated!I can't seem to figure out how to obtain the probability of type 2 errors from this question. A researcher is...

    Started by Donmarco‎, 01-10-2013 05:33 PM
    • Replies: 2
    • Views: 1,053
    01-11-2013, 05:14 PM Go to last post
  41. Likert pre-post test for 3 groups

    Hi there, I have data for a within-subjects study where each subject was asked to perform 3 tasks (in a randomized order to prevent learning...

    Started by abek‎, 01-11-2013 02:27 PM
    • Replies: 0
    • Views: 1,460
    01-11-2013, 02:27 PM Go to last post
  42. Probability in cups and balls experiment.

    Hi, I have a problem which can be described with the following analogy: If two cups containing an amount of balls are held against each other...

    Started by Ydna‎, 01-11-2013 08:59 AM
    • Replies: 4
    • Views: 3,544
    01-11-2013, 02:18 PM Go to last post
  43. Height of the Normal distribution?

    Hi, I am about to calculate Cpk of a given process which consists of two measurements. (see attachment 1 and 2). While I am aware of the meaning...

    Started by KovacsBela‎, 01-11-2013 05:49 AM
    • Replies: 0
    • Views: 1,287
    01-11-2013, 05:49 AM Go to last post
  44. Red face Inter-rater Reliability in Grading Rubric -- How do I analyze this?

    Hello, I'm tasked with analyzing how reliable raters are in rating a single piece of work along multiple dimensions. I'm trying to answer...

    Started by debryc‎, 01-11-2013 12:30 AM
    • Replies: 0
    • Views: 2,152
    01-11-2013, 12:30 AM Go to last post
  45. Significance when self-selected participation is low

    Suppose we have 1000 people. Of those 1000, 4 men and 2 women express interest in option A. Note that each one of the 1000 does not have to render...

    Started by kvista7‎, 01-09-2013 01:09 PM
    confidence interval, self-selected
    • Replies: 6
    • Views: 1,642
    01-10-2013, 07:00 PM Go to last post
  46. [SPSS - GLM-ANOVA] GLM-ANOVA an appropriate choice of statistics?

    Dear Community! I have two questions regarding the GLM-ANOVA and post hoc tests! 1 ) Is the GLM-ANOVA an appropriate choice of statistical...

    Started by gruvaeus‎, 01-10-2013 06:18 AM
    • Replies: 1
    • Views: 1,160
    01-10-2013, 11:54 AM Go to last post
  47. How to do Regression with many replicates of y at each level of x?

    Hi follows, I have data that looks as follows: X, y1, y2, y3, y4 0, 54.241, 127.728, 127.73802, ...

    Started by Modi2020‎, 01-10-2013 10:28 AM
    mixed effect, mixed effects model, mixed models, regresion, regresion analysis
    • Replies: 2
    • Views: 2,408
    01-10-2013, 10:47 AM Go to last post
  48. Process averages with grouped trials

    Hi all, I've come across a problem recently that I'm not even sure is a statistical one, but here goes! I have 50 different processes, each of...

    Started by jwbradley87‎, 01-10-2013 03:17 AM
    • Replies: 0
    • Views: 898
    01-10-2013, 03:17 AM Go to last post
  49. Question Not sure where to begin...

    I'm planning a study in which I will survey about 300 people about their attitude towards a given subject area. They will answer questions on a...

    Started by lmangold‎, 01-09-2013 01:31 AM
    attitudes, likert
    • Replies: 5
    • Views: 2,193
    01-09-2013, 07:31 PM Go to last post
  50. repeated measures anova, post hoc testing

    Hi there, I have a 2x4 fully repeated measures design in which participants had to correctly state whether a target was absent or present in a...

    Started by gooner8‎, 01-05-2013 05:48 PM
    bonferroni, help statistics question, interaction effect, post hoc test, repeated measures anova
    • Replies: 1
    • Views: 2,566
    01-09-2013, 06:24 PM Go to last post
  51. interpreting a model after mean centering

    hello, I have to choose the best way to model the relationship between years' experience and time taken to master a new skill. The curve seems to...

    Started by gooner8‎, 01-09-2013 07:29 AM
    help please, multicollinearity, regression
    • Replies: 8
    • Views: 2,409
    01-09-2013, 01:26 PM Go to last post
  52. ANOVA test for unequal repeated measures from samples

    Hi there, I know how to perform two-way ANOVA with repeated measurements but I don't know how to go ahead with a data of unequal repeated...

    Started by madsmad‎, 01-07-2013 06:27 AM
    • Replies: 1
    • Views: 4,980
    01-09-2013, 01:06 PM Go to last post
  53. Time Series Help: How does a joint distribution function describe a time series?

    I hope that someone is able to help me - I have taken several 500-level statistics courses at my current university, but for some reason some of this...

    Started by slavrenz‎, 01-08-2013 10:57 PM
    • Replies: 2
    • Views: 2,662
    01-09-2013, 10:50 AM Go to last post
  54. 2 way ANOVA? or repeated measures ANOVA?

    Hi, sorry if this is really obvious, but I have this dataset i'm meant to analyse using prism, but I'm not sure i've done the right test? I'm...

    Started by katy12‎, 01-08-2013 01:21 PM
    • Replies: 3
    • Views: 1,986
    01-08-2013, 07:02 PM Go to last post
  55. Standard deviation

    Q1)How: Standard deviation usually measuring the spread of the observations? Q2)Why:If we set for the mean =0 and standard deviation=1 and if I...

    Started by ismail‎, 01-07-2013 10:02 AM
    • Replies: 5
    • Views: 1,803
    01-08-2013, 05:11 PM Go to last post
  56. Weights in equation

    Hey guys. I've been working on some data and I've come up with an idea that I don't know how to calculate (since I'm not really a mathematician)....

    Started by starpen‎, 01-08-2013 12:14 PM
    • Replies: 0
    • Views: 1,361
    01-08-2013, 12:14 PM Go to last post
  57. Wink Check moderation using ANCOVA

    I have searched online and still couldnt find an exact way to check whether there is moderation by a continuous covariant between the DV and a...

    Started by cslbilly1990‎, 01-07-2013 11:42 PM
    • Replies: 0
    • Views: 3,306
    01-07-2013, 11:42 PM Go to last post
  58. simple way to calculate error mean square

    I have data from many experiments, I want to calculate the coefficient of variation for each experiment i.e. error mean square/grand mean, is there a...

    Started by sania‎, 01-07-2013 07:14 PM
    • Replies: 0
    • Views: 1,242
    01-07-2013, 07:14 PM Go to last post
  59. Meta-analysis using unpublished randomised trials

    Meta-analysis using unpublished randomised trials Hi, I am intersted to do a meta-analysis, have data set from about 50 experiments, mostly...

    Started by sania‎, 01-07-2013 04:10 PM
    • Replies: 1
    • Views: 1,486
    01-07-2013, 04:40 PM Go to last post
  60. Estimate improvement in forecast accuracy when consolidating similar forecasted items

    Hi All, Brand new to this forum, please don't beat me up too much... I am trying to determine a method that I can use to estimate what I expect...

    Started by scalise530‎, 01-02-2013 04:22 PM
    • Replies: 2
    • Views: 1,230
    01-07-2013, 07:08 AM Go to last post

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