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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,610
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,542
    07-16-2014, 11:01 AM Go to last post
  1. Should I use chi squared to test these observed vs expected ratios?

    I'm doing a study about the height:radius ratios of limpets on exposed and sheltered shores (The ratio is calculated by dividing height by radius)....

    Started by Little.fish‎, 09-22-2017 10:53 AM
    • Replies: 2
    • Views: 224
    09-24-2017, 06:04 AM Go to last post
  2. Cool Summation Algebra

    Hi guys, new member :D: Here is the question I'm having trouble with: I was having trouble with this as I haven't taken stats in years....

    Started by bronzestudent‎, 09-24-2017 02:24 PM
    • Replies: 0
    • Views: 155
    09-24-2017, 02:24 PM Go to last post
  3. Help - How do you calculate Z scores given mean and standard deviation?

    I need to calculate z(obs) when given mean and standard deviation from a population and one sample, as in μ0 =32, σ0 =10, m=27, and n=25, assuming...

    Started by drrobert8085‎, 09-24-2017 06:55 PM
    z score
    • Replies: 2
    • Views: 162
    09-24-2017, 10:07 PM Go to last post
  4. How do i calculate sample mean values given μ, σ, n and alpha?

    If I'm given a population mean and sd, how can I calculate a sample mean that encloses a central distribution of means for certain values of n and...

    Started by drrobert8085‎, 09-24-2017 10:43 PM
    • Replies: 0
    • Views: 165
    09-24-2017, 10:43 PM Go to last post
  5. Defect Rates

    I have two sample sizes with different defect rates because of the size differences. I need a way, preferably in Excel, to determine if the defect...

    Started by Compliance Carl‎, 09-19-2017 08:22 AM
    • Replies: 6
    • Views: 329
    09-25-2017, 07:37 AM Go to last post
  6. 90% Confidence Problem

    This is the question I am struggling with, it is from a set of practice questions but I am trying to understand how to do this for my upcoming exams,...

    Started by CateB9‎, 09-25-2017 05:49 AM
    • Replies: 1
    • Views: 197
    09-25-2017, 02:38 PM Go to last post
  7. Choosing prior for the regression coefficients in the logistic regression

    I'm trying to model Bayesian logistic regression model (using JAGS in R) with my dependent variable (status: 0=alive, 1 death) & independent variable...

    Started by diyana‎, 09-24-2017 03:50 AM
    categorical variable, dirichlet distribution, logistic regression, normal distribution, prior distribution
    • Replies: 2
    • Views: 141
    09-26-2017, 08:46 AM Go to last post
  8. what type of ANOVA should I use?

    population =30 Breaking it down Number of male participants =20 Number of Female Participants = 10 Number of Working Participants(W) = 8...

    Started by johnnyjohn993‎, 09-26-2017 11:12 AM
    anova, excel
    • Replies: 1
    • Views: 143
    09-26-2017, 06:07 PM Go to last post
  9. Really need help with this stats problem

    I am having a really hard time doing this stats assignment. I finished it all and understood it all until the last question which is just driving me...

    Started by CarpeHiberna‎, 09-21-2017 12:06 AM
    • Replies: 6
    • Views: 440
    09-27-2017, 02:04 AM Go to last post
  10. Counting stats and percentages (with a backstory)

    Greetings all, first of all, let me preemptively apologize for my extremely rudimentary and crude terminology as it pertains to statistics. I'm a...

    Started by TMMB22‎, 09-27-2017 05:49 AM
    • Replies: 0
    • Views: 139
    09-27-2017, 05:49 AM Go to last post
  11. Online Travel Industry in China

    Hi All, I need to forecast market size for online travel industry in China. Let me know possible way out.

    Started by Meenu2310‎, 09-28-2017 02:33 AM
    • Replies: 0
    • Views: 120
    09-28-2017, 02:33 AM Go to last post
  12. Unhappy Nervous breakdown trying to analyse PsychoPy data. Help appreciated.

    Hi, I am at breaking point :shakehead I need to analyse data in SPSS from a stop signal task but there are almost 1000 trials per participant (2...

    Started by triad‎, 09-20-2017 05:16 PM
    • Replies: 1
    • Views: 148
    09-28-2017, 05:03 AM Go to last post
  13. What statistical approach shoud I use in this data?

    Given there are students who answered the survey. About 30 students who answered. I cant see. To use t-test or anova here hmmm what should I use to...

    Started by johnnyjohn993‎, 09-25-2017 07:59 AM
    • Replies: 2
    • Views: 205
    09-28-2017, 06:01 AM Go to last post
  14. Equal or Unequal Samples when comparing more than two means? Does that matter?

    I am going to conduct a study in which I'm going to analyse the mathematical performance of indigenous students in school A and will be compared to...

    Started by SamJohnParr‎, 09-30-2017 02:49 AM
    sample size
    • Replies: 0
    • Views: 118
    09-30-2017, 02:49 AM Go to last post
  15. Dummy variables and their interaction (urgent help required)

    Dear All, I have a question concerning the dummy and dummy interactions. Firm Performance is a continuous variable (variable of interest) and...

    Started by andy1234‎, 09-29-2017 10:29 PM
    dummy variable
    • Replies: 3
    • Views: 143
    09-30-2017, 03:01 AM Go to last post
  16. interpreting correlations of factors within a questionnaire

    Good day I have received stats from my university that I need to interpret but without guidelines. I need help with one in particular: It is about...

    Started by Adi010‎, 09-27-2017 07:38 AM
    • Replies: 5
    • Views: 168
    09-30-2017, 07:59 AM Go to last post
  17. Comparing two populations variance

    I have been doing questions like the following by hand with a calculator Find the best point estimate for the ratio of the population variances...

    Started by Mozz‎, 09-28-2017 09:56 PM
    • Replies: 4
    • Views: 249
    09-30-2017, 08:54 PM Go to last post
  18. Best way to compare game results

    I have an Excel table containing game results (wins & losses). The results have been grouped according to "win streaks". The table has a column for...

    Started by Jennifer Murphy‎, 10-01-2017 02:44 AM
    • Replies: 3
    • Views: 137
    10-01-2017, 07:36 AM Go to last post
  19. Moderation analysis assumptions and how to control them

    Dear all, I am trying to do moderation analysis with Lisrel and working on my data set on SPSS. Can anyone share the assumptions of moderation...

    Started by Ayfer91‎, 09-30-2017 08:03 AM
    #moderation #analysis
    • Replies: 3
    • Views: 158
    10-01-2017, 10:26 AM Go to last post
  20. A question about the time series

    I am doing my homework about time series. And I got stuck at the part b, as I am not sure how to calculate the E(Zt^2). For example, I want to know...

    Started by kenng96‎, 10-01-2017 11:19 AM
    • Replies: 0
    • Views: 158
    10-01-2017, 11:19 AM Go to last post
  21. Energy comsumption data

    Hi, I have some data on 5000 odd households. It contains energy consumption readings in kwh every half an hour. How would I be able to estimate...

    Started by rayjay999‎, 09-30-2017 09:19 PM
    • Replies: 1
    • Views: 152
    10-01-2017, 04:57 PM Go to last post
  22. Help me to choose right statistical method

    Hello everyone!! I have two sets of data for last 10 years and what I am trying is to prove which set of data is increasing continuously in recent...

    Started by deadhunter‎, 10-01-2017 11:06 PM
    • Replies: 0
    • Views: 133
    10-01-2017, 11:06 PM Go to last post
  23. What study type it is

    I'm measuring expression of a particular gene and comparing it between 30 diseased patients and 15 healthy controls of similar age and sex. I...

    Started by Markica85‎, 10-01-2017 11:17 AM
    • Replies: 1
    • Views: 193
    10-02-2017, 01:20 AM Go to last post
  24. tests of agreement between diagnostic tests

    I need to assess agreement between to variables. The problem is that one of the variable is a continuous variable and the other is a categorical...

    Started by Jtoledo‎, 10-01-2017 09:47 PM
    medical statistics, statistical
    • Replies: 3
    • Views: 168
    10-02-2017, 12:41 PM Go to last post
  25. Log-rank test appropriate?

    Hello, I am currently working on a small (29 patients) retrospective analysis of patients undergoing a certain treatment. One of the main...

    Started by Somann‎, 10-02-2017 02:37 PM
    • Replies: 0
    • Views: 116
    10-02-2017, 02:37 PM Go to last post
  26. Several test groups and one big control group: split the group or not?

    Dear members I'm preparing a test of proportions regarding a campaign redemption of several groups which have all common "demographics" but have...

    Started by davidecortellino‎, 10-02-2017 05:48 AM
    proportion test, sample design
    • Replies: 2
    • Views: 140
    10-03-2017, 05:22 AM Go to last post
  27. Question about conditional odds ratio

    I have a question about the definition of a conditional odds ratio (COR). Let's assume a very simple scenario of three binary variables Y,X and Z....

    Started by Alex C‎, 10-02-2017 02:25 PM
    • Replies: 3
    • Views: 183
    10-03-2017, 12:05 PM Go to last post
  28. Statistical Analysis Tool Help

    Each month we run control testing on 5 pieces of equipment using 3 different range values (High, Normal, Low). 5 Readings at each level Normal, High...

    Started by ShayneF‎, 10-03-2017 01:14 PM
    • Replies: 0
    • Views: 120
    10-03-2017, 01:14 PM Go to last post
  29. Question Interpreting histogram

    Thank you!

    Started by vydsl‎, 10-03-2017 01:43 PM
    • Replies: 5
    • Views: 175
    10-03-2017, 05:39 PM Go to last post
  30. Books for Stats

    Hi All I am doing the MBA program. We have stats in our syllabus. I have strong mathematics background, however, I am not finding enough books to...

    Started by vernonicamexie‎, 10-04-2017 12:59 PM
    book, mba, statistics
    • Replies: 3
    • Views: 151
    10-04-2017, 09:58 PM Go to last post
  31. Probability of the correct diagnosis in a lie detector

    Probability of the correct diagnosis in a lie detector A lie detector correctly diagnoses 90% of those who lie (M) and 95% of those who do not lie....

    Started by karlinkas‎, 10-04-2017 07:28 PM
    • Replies: 1
    • Views: 135
    10-05-2017, 11:41 AM Go to last post
  32. Lightbulb F-distribution and T-Distribution

    I have this questions from my test. Can you please help... State True or false 1.The test statistic for the difference of population variance...

    Started by Sasikuma‎, 10-06-2017 08:46 AM
    f-dsitribution, t-distribution
    • Replies: 3
    • Views: 157
    10-06-2017, 01:39 PM Go to last post
  33. How would you solve these questions? Time series

    Question 1 For the AR(3) process, xt = 0.6xt−1 − 0.4xt−2 + 0.4xt−3 find the values of the autocovariance function γ(1) and γ(2) ...

    Started by MrB1982‎, 10-06-2017 05:38 AM
    • Replies: 1
    • Views: 138
    10-07-2017, 08:28 AM Go to last post
  34. Lightbulb finding moments about the origin,

    I am solving a problem in moments and find Bheta1 , Bheta2 but unable solve moments about (i) the origin, and (ii) the point x = 2. 4 moments are as...

    Started by srmarasu84‎, 10-07-2017 09:00 AM
    discriptive statistics
    • Replies: 0
    • Views: 116
    10-07-2017, 09:00 AM Go to last post
  35. Goodness of Fit Test for a small sample size with 4 categories

    Hello, I had a group which did 4 different types of training. There were N=16 participants. After completion of the training, they were asked...

    Started by fuqu‎, 10-06-2017 11:31 PM
    • Replies: 2
    • Views: 164
    10-07-2017, 11:16 AM Go to last post

    how many ways can you arrange a 3 digit number if first number cant be 0 and no numbers can be repeated. My guess is 9*8*7 which equals 504. BUT...

    Started by amandalorenzo484‎, 10-08-2017 12:45 AM
    • Replies: 2
    • Views: 180
    10-08-2017, 08:36 PM Go to last post
  37. A question about using Generalized estimating equations (GEEs)

    Dear All, I have a question regarding using GEEs to test some of my mating system data (the temporal and spatial proximity of males in regard to a...

    Started by gludo‎, 10-09-2017 06:23 AM
    • Replies: 0
    • Views: 37
    10-09-2017, 06:23 AM Go to last post
  38. McGraw-Hill red books

    is anyone familiar with the red book series, psych and stats? respond here for further information and question thanks joe

    Started by joedakota‎, 10-09-2017 09:25 AM
    • Replies: 0
    • Views: 87
    10-09-2017, 09:25 AM Go to last post
  39. Bayes - need help informing priors

    Hi! Anyone here familiar with Bayesian inference? I would like to inform priors for an analysis. I have Odds Ratios and 95% CIs. How would I...

    Started by raske2‎, 10-04-2017 07:23 PM
    bayes, confidence intervals, informed priors, variance
    • Replies: 8
    • Views: 248
    10-09-2017, 06:41 PM Go to last post
  40. Question about intercept and slope p value matter?

    Im doing my research about event study. I used Market Model, with OLS regression to find out expected return. I found some companies as follow : ...

    Started by Eunike‎, 10-09-2017 08:26 AM
    • Replies: 3
    • Views: 128
    10-10-2017, 02:09 AM Go to last post
  41. Hypothesis testing

    Hello Everyone, I am new here so I do not really know where to start, but not ashamed to ask for directions. I am trying to develop a model in...

    Started by Onditi‎, 10-10-2017 03:48 AM
    • Replies: 0
    • Views: 85
    10-10-2017, 03:48 AM Go to last post
  42. Clarify this explanation of why we use d.f.?

    I have read some variant of this explanation of d.f.'s many times - I'll quote the latest one that I read: This explanation would make more...

    Started by bruin‎, 10-05-2017 02:51 PM
    • Replies: 7
    • Views: 240
    10-10-2017, 03:09 PM Go to last post
  43. Mean or median for central tendency

    Classify each of the narratives below based on whether the mean or median provides a better description of the center of its distribution: 1. Age...

    Started by starkmaester‎, 10-08-2017 04:34 AM
    • Replies: 11
    • Views: 273
    10-10-2017, 05:54 PM Go to last post
  44. Calculating new Mean and Variance after observation removal

    I have a random sample of 15 observations and the sample mean is 11.2 and the sample variance is 13.4 but one of the observations of 21.2 was...

    Started by Poena‎, 10-10-2017 08:18 PM
    • Replies: 0
    • Views: 85
    10-10-2017, 08:18 PM Go to last post
  45. Confidence Intervals: Sample proportion and margin of error

    I'm just starting to learn statistics, and I apologize for the likely simple questions I'm asking, but they have me frustrated and I'd like to...

    Started by Spruce‎, 10-10-2017 09:39 PM
    • Replies: 4
    • Views: 137
    10-11-2017, 02:00 AM Go to last post
  46. Standard Deviation, Average +/- or Something Else?

    Hi everyone, I don't have a background in stats, but I'm trying to solve a stats problem. For each year we try to predict what percentage we will...

    Started by garywic‎, 10-10-2017 09:34 PM
    • Replies: 1
    • Views: 117
    10-11-2017, 10:26 AM Go to last post
  47. What does it mean if my Pearson r correlation is not significant?

    Hi there, So ive got a sample size of 400 Uni students, measuring a correlation between stress and exercise levels in minutes, and I received a...

    Started by naturerocker‎, 10-11-2017 06:02 AM
    correlation, nonsignificant, pearson
    • Replies: 2
    • Views: 88
    10-11-2017, 10:28 AM Go to last post
  48. Properties of two subsets of the wealth distribution

    Hello, Consider an arbitrary wealth distribution over a large (possibly infinite) set I of individuals. An individual i has wealth wi. Total...

    Started by Mark_us‎, 10-11-2017 10:54 AM
    • Replies: 0
    • Views: 89
    10-11-2017, 10:54 AM Go to last post
  49. Best way to test if method of count estimation is appropriate?

    So, working through some data where I have to essentially count the number of particles in each replicate. Unfortunately, sometimes there are so many...

    Started by srpang89‎, 10-11-2017 02:35 PM
    • Replies: 0
    • Views: 98
    10-11-2017, 02:35 PM Go to last post
  50. Logistic Regression

    Letís consider the logistic regression model, which we will refer to as Model 1, given by log(pi / ) = 0.25 + 0.32*X1 + 0.70*X2 + 0.50*X3 In the...

    Started by maryjkluther23‎, 10-12-2017 04:14 AM
    • Replies: 0
    • Views: 95
    10-12-2017, 04:14 AM Go to last post
  51. model a sample

    Please help to simulate a sample. simulate a sample of independent observations of a volume 10 having a chi distribution of a square with 6 degrees...

    Started by valeriia‎, 10-12-2017 12:10 PM
    • Replies: 1
    • Views: 122
    10-12-2017, 12:45 PM Go to last post
  52. Not Sure which statistical tests) to use

    Hello everybody, Hope you all are doing well. We have collected some data from students at our medical college. We asked students to complete...

    Started by shaariq‎, 09-29-2017 12:48 AM
    • Replies: 6
    • Views: 284
    10-13-2017, 03:18 AM Go to last post
  53. Quartiles

    Hi,i am confused regarding the formula to calculate quartiles: eg, data set (sorted): 2, 2, 3, 3, 3, 5, 7, 9 (n=8) for lower quartiles the...

    Started by streakcalm‎, 10-13-2017 04:23 AM
    • Replies: 2
    • Views: 128
    10-14-2017, 03:08 AM Go to last post
  54. Need help with a theoretical question

    Here is the question: How does the return distribution relate to the normal distribution if the return horizon becomes longer? :yup:

    Started by drol123‎, 10-14-2017 04:27 AM
    finance, statistics
    • Replies: 0
    • Views: 71
    10-14-2017, 04:27 AM Go to last post
  55. interpret spss results

    Hello every body, I would be grateful if you can help me to interpret the results from SPSS which are in the attached filed. It would be very...

    Started by Elaheh‎, 10-14-2017 04:56 AM
    • Replies: 0
    • Views: 73
    10-14-2017, 04:56 AM Go to last post
  56. Logistic Regression

    Letís consider the logistic regression model, which we will refer to as Model 1, given by log(pi / ) = 0.25 + 0.32*X1 + 0.70*X2 + 0.50*X3 In the...

    Started by maryjkluther23‎, 10-12-2017 04:11 AM
    • Replies: 2
    • Views: 98
    10-14-2017, 06:44 AM Go to last post
  57. P values from 95% CI using poisson distribution

    Hi, Hope I'm in the best place for an answer :) I have a study across 10 years. I have an incidence rate that was calculated for each year along...

    Started by qjuice‎, 10-14-2017 09:00 AM
    confidence interval, incidence rate, poisson distribution
    • Replies: 0
    • Views: 83
    10-14-2017, 09:00 AM Go to last post
  58. Error: 759 in NLOGIT software

    Hi all: I'm trying to estimate a simple logit model following Berry (1994)'s linearization approach to then calculate the demand elasticity based...

    Started by cha11enge‎, 10-14-2017 07:55 PM
    • Replies: 0
    • Views: 76
    10-14-2017, 07:55 PM Go to last post
  59. Help with Anova interpretation

    Hi Guys This is probably simple but I cannot see it. The question is asking how do I determine the number of levels in the anova. Attached is...

    Started by alexi82‎, 10-14-2017 08:12 PM
    • Replies: 2
    • Views: 109
    10-14-2017, 08:20 PM Go to last post
  60. Youdenís J

    Hello, I have a little question about interpretation of Youdenís J. I have three different J values (0.23, 0.26, 0.28) for three different...

    Started by badibad‎, Yesterday 07:14 AM
    • Replies: 1
    • Views: 82
    Yesterday, 04:35 PM Go to last post

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