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: 130,756
    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: 36,999
    09-30-2005, 09:44 AM Go to last post
  1. 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: 120
    Yesterday, 04:33 PM Go to last post
  2. 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, Yesterday 03:57 PM
    anova, chi-square, descriptive statistics, regression analysis
    • Replies: 0
    • Views: 44
    Yesterday, 03:57 PM Go to last post
  3. 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, Yesterday 09:45 AM
    • Replies: 0
    • Views: 47
    Yesterday, 09:45 AM Go to last post
  4. 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: 103
    Yesterday, 06:06 AM Go to last post
  5. 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: 0
    • Views: 65
    08-26-2016, 02:32 AM Go to last post
  6. 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: 569
    08-25-2016, 04:12 PM Go to last post
  7. 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: 72
    08-25-2016, 01:17 PM Go to last post
  8. 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: 146
    08-24-2016, 05:40 PM Go to last post
  9. 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: 96
    08-24-2016, 03:13 PM Go to last post
  10. 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: 144
    08-23-2016, 04:24 AM Go to last post
  11. 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: 59
    08-23-2016, 12:51 AM Go to last post
  12. 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: 356
    08-22-2016, 09:59 AM Go to last post
  13. 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: 128
    08-20-2016, 10:51 AM Go to last post
  14. 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: 57
    08-20-2016, 09:34 AM Go to last post
  15. 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: 52
    08-20-2016, 09:23 AM Go to last post
  16. 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: 156
    08-18-2016, 03:21 AM Go to last post
  17. 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: 134
    08-17-2016, 01:50 PM Go to last post
  18. 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: 165
    08-17-2016, 12:59 PM Go to last post
  19. 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: 183
    08-17-2016, 09:23 AM Go to last post
  20. Data Extrapolation for SEM

    Hi, I have a data of n=50. Is there any way in which I can extrapolate or simulate the data to n=2000, in order to carry out Structural equation...

    Started by alexpjoy‎, 08-17-2016 05:56 AM
    • Replies: 3
    • Views: 102
    08-17-2016, 09:22 AM Go to last post
  21. 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: 75
    08-16-2016, 05:59 PM Go to last post
  22. 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: 91
    08-15-2016, 09:47 PM Go to last post
  23. 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: 139
    08-15-2016, 03:52 PM Go to last post
  24. 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: 116
    08-15-2016, 11:26 AM Go to last post
  25. 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: 86
    08-15-2016, 11:18 AM Go to last post
  26. 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: 164
    08-13-2016, 09:18 AM Go to last post
  27. 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: 1
    • Views: 194
    08-11-2016, 07:09 PM Go to last post
  28. 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: 120
    08-11-2016, 12:46 PM Go to last post
  29. 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: 99
    08-10-2016, 09:49 AM Go to last post
  30. 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: 194
    08-08-2016, 11:52 PM Go to last post
  31. 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: 168
    08-08-2016, 04:53 PM Go to last post
  32. 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: 181
    08-08-2016, 08:44 AM Go to last post
  33. 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: 137
    08-07-2016, 12:15 PM Go to last post
  34. 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: 203
    08-06-2016, 06:50 AM Go to last post
  35. 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: 111
    08-06-2016, 06:31 AM Go to last post
  36. 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: 148
    08-05-2016, 08:27 AM Go to last post
  37. 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: 199
    08-04-2016, 08:08 AM Go to last post
  38. 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: 104
    08-04-2016, 07:50 AM Go to last post
  39. 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: 139
    08-03-2016, 04:37 PM Go to last post
  40. 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: 130
    08-03-2016, 09:43 AM Go to last post
  41. 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: 204
    08-02-2016, 09:21 AM Go to last post
  42. 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: 149
    08-01-2016, 12:16 PM Go to last post
  43. 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: 128
    08-01-2016, 10:08 AM Go to last post
  44. 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: 7
    • Views: 373
    08-01-2016, 07:38 AM Go to last post
  45. 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: 145
    08-01-2016, 02:47 AM Go to last post
  46. 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: 233
    07-31-2016, 04:54 PM Go to last post
  47. 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: 190
    07-30-2016, 04:58 PM Go to last post
  48. 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: 212
    07-28-2016, 03:27 PM Go to last post
  49. 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: 156
    07-28-2016, 07:19 AM Go to last post
  50. 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: 154
    07-27-2016, 12:13 PM Go to last post
  51. 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: 186
    07-27-2016, 07:07 AM Go to last post
  52. 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: 608
    07-27-2016, 06:18 AM Go to last post
  53. 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: 195
    07-26-2016, 02:53 AM Go to last post
  54. 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: 283
    07-25-2016, 08:41 PM Go to last post
  55. Combining Standard Errors of 16 portfolios

    Hello everyone, I am working on Fama and French five factor model. I have run regression on 16 size- B/M excess portfolio returns on market...

    Started by Subhan Ahmad‎, 07-25-2016 03:31 PM
    regression coefficent, standard error
    • Replies: 0
    • Views: 159
    07-25-2016, 03:31 PM Go to last post
  56. Fitting a distribution to data using MLE

    I have a dataset to which I'd like to fit a distribution using MLE. In the old days, I would have taken a guess and then used a KS test to see if...

    Started by Kenabbott‎, 07-24-2016 12:08 PM
    fit distribution, gamlss, kolmagorov-smirnoff, mle
    • Replies: 4
    • Views: 256
    07-24-2016, 03:00 PM Go to last post
  57. FREE Statistics Help

    Hi! A list of books, tutorials, YouTube videos, chat forums, and online calculators is found at: http://www.ZeteticLibrary.com/help.htm ...

    Started by DrAnthonyRodriguez‎, 07-24-2016 09:32 AM
    free help
    • Replies: 0
    • Views: 188
    07-24-2016, 09:32 AM Go to last post
  58. T distribution

    1. True or False: For a t distribution with 12 degrees of freedom, the area between 2.6810 and 2.1788 is 0.970. 2. True or False: For a t...

    Started by Hasan‎, 07-23-2016 11:50 AM
    t distribution
    • Replies: 3
    • Views: 161
    07-24-2016, 08:02 AM Go to last post
  59. Combination

    You are at an ice cream shop that offers 9 different flavors of ice cream. A large ice cream cone comes with three scoops of ice cream. You can...

    Started by Hasan‎, 07-23-2016 11:48 AM
    • Replies: 6
    • Views: 212
    07-24-2016, 08:00 AM Go to last post
  60. Test Statistics

    A major swimming chain is considering opening a new store in an area that currently does not have any such stores. The chain will open if there is...

    Started by Hasan‎, 07-23-2016 11:46 AM
    hypotheis test, unrealistic
    • Replies: 4
    • Views: 180
    07-24-2016, 05:58 AM Go to last post

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