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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: 200,384
    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: 68,589
    09-30-2005, 09:44 AM Go to last post
  1. Survey Results Help

    Hi, We did a survey of our staff in March and had 23 respondents. We redid the exact same survey in July with 19 respondents. We would like to...

    Started by VPLe‎, 08-31-2016 05:10 PM
    • Replies: 1
    • Views: 1,365
    09-01-2016, 02:31 PM Go to last post
  2. ICC analysis: per trial, per condition on per patient?

    Hi everyone, I have a question relative to an ICC analysis. I want to compare 2 methods to assess motor blocks occurring during walking in...

    Started by Mur‎, 09-01-2016 07:43 AM
    • Replies: 0
    • Views: 1,412
    09-01-2016, 07:43 AM Go to last post
  3. Can I use a pearson correlation with repeated measures?

    I have measured 5 different behavioural responses of birds to birdsong playbacks from a speaker (e.g. how long they took to sing back to the playback...

    Started by shardman‎, 08-29-2016 11:00 AM
    correlation, pearson
    • Replies: 5
    • Views: 1,984
    08-30-2016, 05:35 PM Go to last post
  4. bounds on the value of the SD

    I learned stats in a very applied, algebra-based way...so for those of you who've taken a series of more rigorous stats courses, this will likely be...

    Started by bruin‎, 08-29-2016 04:56 PM
    • Replies: 5
    • Views: 2,569
    08-30-2016, 12:22 AM Go to last post
  5. Calculating chi-squared statistic in Excel

    Folks I've carried out a chi-squared test on the following observed and expected values using the CHISQ.TEST function in Excel: Observed: 176,...

    Started by Remster‎, 08-29-2016 12:02 PM
    • Replies: 3
    • Views: 1,559
    08-29-2016, 06:45 PM Go to last post
  6. Insignificant correlation - significant regression

    I couldn't find this on the search - maybe it's too basic ;) So I have two variables which significantly positively correlate with each other (r =...

    Started by Rec‎, 08-29-2016 12:13 PM
    • Replies: 1
    • Views: 1,433
    08-29-2016, 01:10 PM Go to last post
  7. Statistical method to compare urban vs rural matched siblings

    I am writing a study protocol for my masters thesis. The study seeks to compare the rates of Non Communicable Diseases and risk factors and determine...

    Started by rectus‎, 08-29-2016 01:37 AM
    compare groups
    • Replies: 1
    • Views: 956
    08-29-2016, 10:19 AM Go to last post
  8. index of variability

    Hi I have objects and each object have given precentages of their appearances in different situations. For example: object 1 20% 40% 30% 5%...

    Started by luida‎, 08-11-2016 05:19 PM
    • Replies: 2
    • Views: 1,236
    08-29-2016, 05:34 AM Go to last post
  9. A/B Split Testing - How to factor in cost?

    Hi guys! I'm looking for advices in the application on an A/B split test calculator. Hopefully we can solve this problem together... Here goes: ...

    Started by Zeth‎, 08-26-2016 02:32 AM
    • Replies: 1
    • Views: 3,231
    08-28-2016, 04:28 PM Go to last post
  10. Hypothesis Test

    n=45 sample mean = 17.1 sample std dev = 6.4 What is the probability that the sample mean differs from the true mean by 2 or more? Thanks in...

    Started by AntonChigurh‎, 08-16-2016 12:21 PM
    • Replies: 3
    • Views: 1,416
    08-27-2016, 04:33 PM Go to last post
  11. Cool compare groups and examine relationships

    Hi, 1.I am planning to examine the level of user engagement of participants playing a particular computer game, that has two versions, one in color...

    Started by uxk8396‎, 08-27-2016 03:57 PM
    anova, chi-square, descriptive statistics, regression analysis
    • Replies: 0
    • Views: 1,196
    08-27-2016, 03:57 PM Go to last post
  12. Request for a dvice on best test to use

    Dear all, I'm a total newbie with stats so please forgive me if I'm naive here. I would appreciate your help and expertise for my master's thesis....

    Started by HelenaBuras‎, 08-27-2016 09:45 AM
    • Replies: 0
    • Views: 1,410
    08-27-2016, 09:45 AM Go to last post
  13. Likert Scale - Not Applicable Option

    I have the following scales: 1 (Strongly Disagree); 2 (Disagree); 3 (Not Applicable); 4 (Agree); 5 (Strongly Agree); Questionnaire responses:...

    Started by uxk8396‎, 08-26-2016 09:57 AM
    • Replies: 1
    • Views: 1,502
    08-27-2016, 06:06 AM Go to last post
  14. Doubt on statistical test

    Hi, my perception test presents one stimulus at a time and the listener has to choose one from three possible answers. There are 5 stimuli...

    Started by sid2016‎, 08-09-2016 12:59 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,552
    08-25-2016, 04:12 PM Go to last post
  15. Regression: Independent variable (proportions) with missing values

    Hello, My dependent variable is counts of fights in schools. My independent variable is the schools’ proportion of students with a single parent....

    Started by Marvin85‎, 08-25-2016 01:17 PM
    • Replies: 0
    • Views: 1,081
    08-25-2016, 01:17 PM Go to last post
  16. Lightbulb Finding means and regression coefficients of dataset while controlling for outliers?

    Edit: in the title I meant CONFOUNDERS, not outliers, sorry!! Hi, I have a dataset which consists of around 50 people, split into 3 groups....

    Started by phoela‎, 08-24-2016 07:05 AM
    • Replies: 5
    • Views: 2,115
    08-24-2016, 05:40 PM Go to last post
  17. Comparing 2 groups if t-test insignificant

    Hi everyone, Is it always wrong to compare two groups if their means are not significantly different, as measured in a t-test, if they are...

    Started by Rec‎, 08-24-2016 03:13 PM
    • Replies: 0
    • Views: 1,187
    08-24-2016, 03:13 PM Go to last post
  18. I do not understand standard normal distribution

    Hi guys, I'm in dire help for standard normal random variable. I've looked at examples but they don't seem to help with the following questions. ...

    Started by helpimdesperate‎, 08-22-2016 11:40 PM
    • Replies: 3
    • Views: 1,151
    08-23-2016, 04:24 AM Go to last post
  19. Infinite sample AQL approach to confidence level and sample size

    Hi all. This is my first post so I hope it makes sense and is appropriate for this forum. For years we have been setting the temperature of our...

    Started by rli‎, 08-23-2016 12:51 AM
    • Replies: 0
    • Views: 754
    08-23-2016, 12:51 AM Go to last post
  20. Does a pill cause more weight loss than a placebo?

    Let's say I want to know whether a certain weight loss pill works. I have before and after weights of 15 people who took the pill and 20 people who...

    Started by efoss‎, 08-19-2016 12:01 PM
    • Replies: 14
    • Views: 2,001
    08-22-2016, 09:59 AM Go to last post
  21. Calculation of expected values for chi-squared test

    Folks I need to work out the probability that a set of survey results occurred by chance, and I intend to use a chi-squared test. However, I...

    Started by Remster‎, 08-20-2016 10:51 AM
    chi-squared, expected values, probability
    • Replies: 0
    • Views: 1,878
    08-20-2016, 10:51 AM Go to last post
  22. Combining Variables in R-Studio

    Hello, I would like to know what function or code I would use to combine variables into 1 factor in R-Studio. For example I have measured six...

    Started by Rstatspsych‎, 08-20-2016 09:34 AM
    • Replies: 0
    • Views: 3,002
    08-20-2016, 09:34 AM Go to last post
  23. R Code/Scripts

    Hello, Could somebody kind please advise me on the best source for R code and scripts (in particular for Factor Analysis and ANOVA). Thank you...

    Started by Rstatspsych‎, 08-20-2016 09:23 AM
    • Replies: 0
    • Views: 1,284
    08-20-2016, 09:23 AM Go to last post
  24. Analysing multiple group scores on likert scale

    Hi all, Long-time reader, first time poster here. Apologies for the slightly lengthy post. I'm just wanting a bit of advice for something i'm...

    Started by Maudo‎, 08-18-2016 03:21 AM
    • Replies: 0
    • Views: 1,089
    08-18-2016, 03:21 AM Go to last post
  25. Help! problem with confidence intervals

    Hi I am studying the relationships between two variables (coded as yes or no) I used the odds ratio formula in R to get the odds ratio and the...

    Started by yuy2000‎, 08-17-2016 01:50 PM
    • Replies: 0
    • Views: 1,226
    08-17-2016, 01:50 PM Go to last post
  26. Lambda distribution, need help on approach

    Let A~Wp(I,m) and B~Wp(I,n) with A and B independent, with m≥p. We say that: Λ = det⁡(A) ÷ det⁡(A+B) has a wilks’ lambda distribution with...

    Started by Kawal‎, 08-16-2016 08:31 PM
    • Replies: 2
    • Views: 2,278
    08-17-2016, 12:59 PM Go to last post
  27. Longitudinal analysis

    Hello. I would love some help: I have a dataset with 111 cases of a rare disease registered throughout a 10-year period in one Hospital. I have...

    Started by lucaspconzatti‎, 08-14-2016 12:36 PM
    analysis through time, longitudinal analysis
    • Replies: 4
    • Views: 1,396
    08-17-2016, 09:23 AM Go to last post
  28. Normalising Search Data

    Hi Guys, Just want to start by saying great forums, some really useful stuff on here! I'm basically a statistics novice, though i did do a few...

    Started by TheGreatestGoat‎, 08-16-2016 05:59 PM
    analyse, data, normalization, trend, trend analysis
    • Replies: 0
    • Views: 943
    08-16-2016, 05:59 PM Go to last post
  29. Interrater reliability test on 3 raters (2 experts and 1 non-expert) on ordinal data

    I need to find the interrater reliability between 3 raters. A nurse (non-expert) performed 60 ultrasound scans and categorised patients into 3...

    Started by Narell‎, 08-15-2016 09:47 PM
    icc, interrater reliability, kappa
    • Replies: 0
    • Views: 728
    08-15-2016, 09:47 PM Go to last post
  30. Advice needed on 3 way contingency tables and negetive binomial distribution question

    Hi I'm new to the forum so sorry if I'm being rude or impolite in any way, I had an exam in the summer and I thought I did well in it but when I got...

    Started by Josh8642‎, 08-15-2016 03:40 PM
    • Replies: 1
    • Views: 963
    08-15-2016, 03:52 PM Go to last post
  31. Different degrees of freedom when reporting multiple T-tests

    Please refer to Table attached. This study compares those without a phobic disorder (n=83) with those with a phobic disorder (n=16) on Temperament...

    Started by Alyssa1‎, 08-15-2016 12:37 AM
    • Replies: 3
    • Views: 1,171
    08-15-2016, 11:26 AM Go to last post
  32. which statistical test to use?

    Hi people, Im a statistic student curently and Im wondering which hypothesis statistical test i should use. It is to compare the mean of year...

    Started by kasujichan‎, 08-15-2016 08:32 AM
    • Replies: 3
    • Views: 1,620
    08-15-2016, 11:18 AM Go to last post
  33. Question Spearman's rho or no? is one of my datasets non-monotonic?

    Hi, I'm dyslexic with limited stat education (and the internet is not helping thus far) and I'm having horrible trouble understanding what tests I...

    Started by adyslexicsnemesis‎, 08-12-2016 03:33 PM
    association, correlation, nonlinear, spearman's rho
    • Replies: 1
    • Views: 1,622
    08-13-2016, 09:18 AM Go to last post
  34. Statistical test help!

    Hello, I was wondering if someone can help me with this. I have a dataset with the following variables: - ID - Type of Outlet: Pastesite,...

    Started by chesterb‎, 08-11-2016 12:46 PM
    • Replies: 0
    • Views: 1,560
    08-11-2016, 12:46 PM Go to last post
  35. Good CFA indices but poor SEM indices

    Hi all, I was wondering if anyone could help me make sense of my results from Structural Equation Modelling for my Masters thesis. I've first...

    Started by gordo12‎, 08-10-2016 09:49 AM
    analysis help, fit indices, statistics, structural equation model
    • Replies: 0
    • Views: 1,194
    08-10-2016, 09:49 AM Go to last post
  36. Is multinomial logistical regression appropriate here?

    I'm wondering about the appropriate statistical test in the following type of situation: Let's say you think that mouse coat color (black, white...

    Started by efoss‎, 08-08-2016 07:00 PM
    • Replies: 2
    • Views: 1,259
    08-08-2016, 11:52 PM Go to last post
  37. Create an exponential based function

    End product would be a sequence of 50 numbers that go from 0 to 1 with an exponential distribution, so if plotted it would resemble a quarterpipe or...

    Started by hlsmith‎, 08-08-2016 03:44 PM
    • Replies: 7
    • Views: 1,521
    08-08-2016, 04:53 PM Go to last post
  38. Time series forecast. Probability of forecasted value exceeding a threshold value?

    OK. Let's say that I have several years of monthly sales data. How would I go about finding the probability that monthly sales, three months in the...

    Started by downthesun01‎, 08-06-2016 02:42 PM
    threshold, time series
    • Replies: 2
    • Views: 1,984
    08-08-2016, 08:44 AM Go to last post
  39. What does this sentence mean? (I'm very new to statistics!)

    I'm reading a research paper. It's about the effects of test offerings (opt in, opt out or active choice) to patients on the acceptance of the...

    Started by dannyevelyn‎, 08-07-2016 12:15 PM
    • Replies: 0
    • Views: 1,134
    08-07-2016, 12:15 PM Go to last post
  40. F (18, 95) = 6.009, p < 0.0005

    I was looking into a research paper, and this F value was provided when using a regression model. I do not understand, what is the need to discuss F...

    Started by leodzb‎, 08-05-2016 06:47 AM
    f value, regresion analysis
    • Replies: 5
    • Views: 2,467
    08-06-2016, 06:50 AM Go to last post
  41. Difference in Difference-SPSS: Creating dummy variable

    I am doing a program evaluation and want to use difference in difference analysis. I calculated the difference in difference by hand and now want to...

    Started by Elsbeast‎, 08-06-2016 06:31 AM
    difference-in-difference, dummy coding, regression analysis, spss
    • Replies: 0
    • Views: 1,999
    08-06-2016, 06:31 AM Go to last post
  42. 2 x2 repeated measures ANOVA, significant interaction, all the pairewise comparisons

    I ran a 2 x 2 repeated measures ANOVA using SPSS (both IVs are within-subject factors). Both main effects and interaction were significant. Then I...

    Started by MartenCalley‎, 08-05-2016 08:27 AM
    • Replies: 0
    • Views: 1,050
    08-05-2016, 08:27 AM Go to last post
  43. Model Ratio using Linear Regression

    Hello, I have a question about linear regression modeling on ratio. The original model with dependent variable of ratio is Y= (Y1/ Y2). Both Y1...

    Started by niuniu‎, 08-01-2016 09:18 AM
    • Replies: 4
    • Views: 1,506
    08-04-2016, 08:08 AM Go to last post
  44. Urgent help needed: Creating a new specialised correlate variable

    Dear SPSS-experts, I'm a student that needs urgent help with the data-analysis of my master dissertation. I've conducted a survey among 150...

    Started by Snugg1‎, 08-04-2016 07:50 AM
    • Replies: 0
    • Views: 835
    08-04-2016, 07:50 AM Go to last post
  45. What statistical test should be used?

    I've collected data on the number of individuals of seven species at three different sites and want to test if there is a statistically significant...

    Started by amyt997‎, 08-03-2016 04:37 PM
    statistical test
    • Replies: 0
    • Views: 1,138
    08-03-2016, 04:37 PM Go to last post
  46. I'm having difficulty understanding these statistical terms!

    Hello! I'm reading a paper on HIV screening, (testing HIV test acceptance percentage by test offer eg. opt in, opt out and active choice). I want to...

    Started by dannyevelyn‎, 08-03-2016 06:16 AM
    • Replies: 1
    • Views: 1,057
    08-03-2016, 09:43 AM Go to last post
  47. two continuous & two categorical variables: how to compare

    Dear all, I have the following biological data: 1st variable (continuous, normally distributed): concentration of a hormone in blood 2nd...

    Started by Alexei‎, 08-01-2016 05:05 AM
    multivariate analysis
    • Replies: 3
    • Views: 1,545
    08-02-2016, 09:21 AM Go to last post
  48. Trouble for correlation interpretation regarding mutual funds

    Hey guys! I'm working on the analysis of the results of actively managed mutual funds. Long story short, I need to make sure my funds are actually...

    Started by Victor0nl1n3‎, 08-01-2016 12:16 PM
    • Replies: 0
    • Views: 1,022
    08-01-2016, 12:16 PM Go to last post
  49. Smile Unbiased OLS estimator

    The description here seems very vague. I have been struggling on this for a while, can anyone detail how the final step is achieved?

    Started by econstatsman‎, 08-01-2016 08:52 AM
    • Replies: 1
    • Views: 1,348
    08-01-2016, 10:08 AM Go to last post
  50. Probability Problem

    there are two roads from A to B, and two roads from B to C.each of the four roads has independently probability 1/10 of being blocked by snow.What is...

    Started by osamastat‎, 07-28-2016 12:21 PM
    • Replies: 6
    • Views: 4,028
    08-01-2016, 07:38 AM Go to last post
  51. Post What method is recommended, use contrast or t.test

    I have a set with 60 observations, in four groups t1,t2,m1,m2 each with 15 observations. If I want to compare t1,t2 to m1,m2 or t1,m1 to t2,m2 what I...

    Started by mmartos‎, 07-31-2016 10:22 AM
    compare 2 means, contrast analysis, t.test
    • Replies: 1
    • Views: 2,207
    08-01-2016, 02:47 AM Go to last post
  52. Question Need a Proof for a Complicated Covariance equation

    Hi everyone I begin to study time series analysis from a short time , and i found this equation which author did not give a proof for it so...

    Started by sasha 99‎, 07-25-2016 12:54 PM
    • Replies: 3
    • Views: 2,122
    07-31-2016, 04:54 PM Go to last post
  53. Hypothesis topic-URGENT

    Hi, I am struggling with my Statistics Course (college level). I was able to get through it, but I am at my Final Project. I need help...

    Started by Lizard‎, 07-30-2016 04:20 PM
    • Replies: 2
    • Views: 1,890
    07-30-2016, 04:58 PM Go to last post
  54. Inter-Rater Reliability - Question Combines Stats and SPSS Procedural Components

    Hello, I have a sample of 5,000 health assessments (with ratings from 1-5 on 7 dimensions that roll up to a composite score) completed on 1,400...

    Started by AnneS‎, 07-27-2016 04:16 PM
    • Replies: 2
    • Views: 961
    07-28-2016, 03:27 PM Go to last post
  55. Survey population rules

    Hi there! I'm new here so be gentle :) I have a specific problem to solve and I'm stuck, maybe I'm not asking the right questions, but I can't get...

    Started by codeline‎, 07-28-2016 06:20 AM
    • Replies: 1
    • Views: 1,317
    07-28-2016, 07:19 AM Go to last post
  56. Identifying certain samples in a group

    My objective is to understand whether a manufactured item made with a modified process looks better than that same item made with a current process. ...

    Started by Dan Hall‎, 07-27-2016 12:13 PM
    • Replies: 0
    • Views: 1,356
    07-27-2016, 12:13 PM Go to last post
  57. Technical term for "combination effect"

    Hello everybody, For the critics of my bachelor thesis I want to point out that my findings only apply for the used parameters and "combination...

    Started by Jacky867‎, 07-27-2016 03:28 AM
    • Replies: 1
    • Views: 1,894
    07-27-2016, 07:07 AM Go to last post
  58. Chi square test where one variable is a constant

    Hello everyone, This is my first post on this forum. I am a newbie in this field and am trying hard to grasp the concepts of using statistical...

    Started by shaariq‎, 07-01-2016 01:22 AM
    • Replies: 9
    • Views: 4,348
    07-27-2016, 06:18 AM Go to last post
  59. Comparison groups - how to test whether effect is stronger on one group than another?

    Hi guys, I would like to know whether a nominal variable (with four categories: credit-, debitcard, cash and neutral priming method) has a...

    Started by Goahead1‎, 07-25-2016 02:24 PM
    • Replies: 1
    • Views: 1,121
    07-26-2016, 02:53 AM Go to last post
  60. Use the moment-generating function to find the mean

    I have the moment-generating function for the discrete uniform distribution f(x)=\frac{1}{k} for x=1,2,...k: Mx(t)=\frac{e^t(1-e^t)}{k(1-e^t)} ...

    Started by Buckeye‎, 07-23-2016 07:50 PM
    • Replies: 3
    • Views: 1,748
    07-25-2016, 08:41 PM Go to last post

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