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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: 197,032
    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: 66,893
    09-30-2005, 09:44 AM Go to last post
  1. It's posible to compare two means without considering standard deviations?

    My doubt is the following 'it's possible to compare means of two independent groups without considering standard deviations" ? For example: ...

    Started by balducci‎, Today 11:21 AM
    means, means difference, standard deviation, variability
    • Replies: 0
    • Views: 7
    Today, 11:21 AM Go to last post
  2. Is it OK to analyze all measures as independent data in paired dataset

    I have data from triple-crossover study. Same patients received a drug in the morning then in the noon then in the evening and different parameters...

    Started by Markica85‎, Today 03:12 AM
    • Replies: 0
    • Views: 35
    Today, 03:12 AM Go to last post
  3. R, need help setting up my contrast

    I have a problem that provides litter types (M, Mix, MM) and weights. It asks me to conduct a planned comparison and test whether M>mix>mm. I...

    Started by Maritza‎, Yesterday 09:53 PM
    • Replies: 0
    • Views: 60
    Yesterday, 09:53 PM Go to last post
  4. Red face Can someone please confirm if I have selected the right tests for hypothesis testing?

    Hi, this is my first post here, hope that I'm doing this correctly! I'm taking a statistics course for my master's where we need to do some...

    Started by james030‎, Yesterday 12:43 PM
    chi-square, hypothesis testing, t-test
    • Replies: 0
    • Views: 68
    Yesterday, 12:43 PM Go to last post
  5. Repeated measures 2x3 design on SPSS

    My data has two factors. Factor 1 has 2 levels and Factor 2 has 3 levels. ie a 2x3 design. Right? The study is within-subjects. So on SPSS, I...

    Started by heeeeeellllllpppppppppp‎, 10-15-2017 07:33 PM
    repeat measures, spss, unbalanced analysis
    • Replies: 3
    • Views: 205
    Yesterday, 01:48 AM Go to last post
  6. One or two tailed test?

    Hi, I am currently struggling to decide whether the following problem requires a one or two tailed t test for a hypothesis test. I have uploaded a...

    Started by TomA‎, 10-19-2017 09:52 AM
    • Replies: 1
    • Views: 108
    10-19-2017, 10:52 AM Go to last post
  7. Appropriate Bonferroni correction

    I'm comparing two groups of patients using several 3x2 and 4x2 contingency tables (for different sublevels of chemotherapy for instance). Question is...

    Started by Markica85‎, 10-19-2017 09:32 AM
    • Replies: 1
    • Views: 81
    10-19-2017, 10:49 AM Go to last post
  8. 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: 2
    • Views: 170
    10-19-2017, 10:46 AM Go to last post
  9. Choosing the right winsorizing method for outliers

    So far, I've only been able to find references to 2 methods for winsorizing outliers: 1) substituting the outlier for the next higher or lower...

    Started by ogrfnkl‎, 10-19-2017 07:31 AM
    • Replies: 0
    • Views: 58
    10-19-2017, 07:31 AM Go to last post
  10. Normal Distribution: MLE, UMVUE & MSE

    Attached is a problem regarding MLE and UMVUE of a normal sample. Does anyone know how to do b) the MSE part? The use of An is confusing.

    Started by derekvdb‎, 10-18-2017 01:00 PM
    • Replies: 2
    • Views: 129
    10-18-2017, 02:33 PM Go to last post
  11. 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: 7
    • Views: 370
    10-18-2017, 12:53 AM Go to last post
  12. MAPE - Split out the positive and negative results?

    Hi there, New to statistics, would appreciate any advice you can give :) Doing forecast accuracy, and looking at using MAPE. I have data...

    Started by garywic‎, 10-17-2017 07:17 PM
    • Replies: 0
    • Views: 107
    10-17-2017, 07:17 PM Go to last post
  13. Exclamation How to find a median of medians? No raw data


    Started by bananap0psickle‎, 10-17-2017 12:20 AM
    estimate, formula, median, percentile, weighted
    • Replies: 0
    • Views: 122
    10-17-2017, 12:20 AM Go to last post
  14. Red face Binomial expectation E(X|X>1)

    General case: X~B(n,p) I could integrate the product of x and pmf from 1 to infinity and divide it by the integral of just pmf from 1 to infinity...

    Started by AliceBaker‎, 10-16-2017 02:03 PM
    binomial, conditional expectation, conditional variance, expectation
    • Replies: 1
    • Views: 160
    10-16-2017, 04:20 PM Go to last post
  15. 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, 10-15-2017 07:14 AM
    • Replies: 1
    • Views: 116
    10-15-2017, 04:35 PM Go to last post
  16. 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: 150
    10-14-2017, 08:20 PM Go to last post
  17. 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: 102
    10-14-2017, 07:55 PM Go to last post
  18. 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: 116
    10-14-2017, 09:00 AM Go to last post
  19. 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: 122
    10-14-2017, 06:44 AM Go to last post
  20. 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: 93
    10-14-2017, 04:56 AM Go to last post
  21. 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: 97
    10-14-2017, 04:27 AM Go to last post
  22. 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: 147
    10-14-2017, 03:08 AM Go to last post
  23. 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: 143
    10-12-2017, 12:45 PM Go to last post
  24. 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: 123
    10-12-2017, 04:14 AM Go to last post
  25. 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: 107
    10-11-2017, 02:35 PM Go to last post
  26. 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: 107
    10-11-2017, 10:54 AM Go to last post
  27. 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: 99
    10-11-2017, 10:28 AM Go to last post
  28. 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: 141
    10-11-2017, 10:26 AM Go to last post
  29. 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: 146
    10-11-2017, 02:00 AM Go to last post
  30. 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: 93
    10-10-2017, 08:18 PM Go to last post
  31. 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: 294
    10-10-2017, 05:54 PM Go to last post
  32. 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: 265
    10-10-2017, 03:09 PM Go to last post
  33. 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: 105
    10-10-2017, 03:48 AM Go to last post
  34. 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: 152
    10-10-2017, 02:09 AM Go to last post
  35. 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: 284
    10-09-2017, 06:41 PM Go to last post
  36. 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: 108
    10-09-2017, 09:25 AM 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: 43
    10-09-2017, 06:23 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: 217
    10-08-2017, 08:36 PM Go to last post
  39. 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: 174
    10-07-2017, 11:16 AM Go to last post
  40. 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: 132
    10-07-2017, 09:00 AM Go to last post
  41. 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: 166
    10-07-2017, 08:28 AM Go to last post
  42. 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: 185
    10-06-2017, 01:39 PM Go to last post
  43. 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: 171
    10-05-2017, 11:41 AM Go to last post
  44. 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: 172
    10-04-2017, 09:58 PM Go to last post
  45. Question Interpreting histogram

    Thank you!

    Started by vydsl‎, 10-03-2017 01:43 PM
    • Replies: 5
    • Views: 202
    10-03-2017, 05:39 PM Go to last post
  46. 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: 139
    10-03-2017, 01:14 PM Go to last post
  47. 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: 213
    10-03-2017, 12:05 PM Go to last post
  48. 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: 152
    10-03-2017, 05:22 AM Go to last post
  49. 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: 191
    10-02-2017, 12:41 PM Go to last post
  50. 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: 226
    10-02-2017, 01:20 AM Go to last post
  51. 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: 159
    10-01-2017, 11:06 PM Go to last post
  52. 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: 171
    10-01-2017, 04:57 PM Go to last post
  53. 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: 183
    10-01-2017, 11:19 AM Go to last post
  54. 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: 183
    10-01-2017, 10:26 AM Go to last post
  55. 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: 170
    10-01-2017, 07:36 AM Go to last post
  56. 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: 282
    09-30-2017, 08:54 PM Go to last post
  57. 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: 181
    09-30-2017, 07:59 AM Go to last post
  58. 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: 157
    09-30-2017, 03:01 AM Go to last post
  59. 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: 131
    09-30-2017, 02:49 AM Go to last post
  60. 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: 236
    09-28-2017, 06:01 AM Go to last post

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