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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: 200,111
    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: 68,420
    09-30-2005, 09:44 AM Go to last post
  1. Question Truncated Data Analysis - Standard Deviation

    It has been too long since I have utilized statistics, so looking for a little simple instructions. Need to verify if my approach is at all correct?...

    Started by crumfert‎, 05-16-2016 02:14 PM
    • Replies: 0
    • Views: 2,215
    05-16-2016, 02:14 PM Go to last post
  2. Hypothesis difficulty

    Let Y_{ij}=1 if the i^{\text{th}} child is classified as obese at the j^{\text{th}} occasion, and Y_{ij}=0 otherwise. The marginal probability of...

    Started by Cynderella‎, 05-16-2016 07:41 AM
    gee, glm, hypotheisis testing, interaction term, longitudinal
    • Replies: 0
    • Views: 1,269
    05-16-2016, 07:41 AM Go to last post
  3. which test? random selection of raters from a pool with averaged results

    Hi all, I have 11 raters that I am comparing to a gold standard test. I would like to run a test that randomly selects 5 (also 7 and 9) raters for...

    Started by haymaree‎, 05-16-2016 04:36 AM
    • Replies: 0
    • Views: 1,232
    05-16-2016, 04:36 AM Go to last post
  4. What is SPSS's default outlier checker in the explore function?Are there better ways?

    Dear Everyone, Does anyone know what test SPSS uses in the explore function found in the descriptives section? I assume it is something like...

    Started by tro2‎, 05-15-2016 12:55 PM
    • Replies: 0
    • Views: 1,767
    05-15-2016, 12:55 PM Go to last post
  5. How can calculate the percentage?

    Hi, Anyone know how can make this table? How can calculate the percentage? http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3769886/ ...

    Started by yueli7‎, 05-15-2016 12:17 PM
    • Replies: 0
    • Views: 1,463
    05-15-2016, 12:17 PM Go to last post
  6. Rand(vars)

    When i run a mixed logit model about the labour supply what are the random variables ? Sex, age?

    Started by Lena‎, 05-15-2016 08:58 AM
    • Replies: 0
    • Views: 1,041
    05-15-2016, 08:58 AM Go to last post
  7. Cool Compare Percentages

    I have some survey data and know the number and percentage of "yes" responses. How do I determine if any of the percentage yes regional responses...

    Started by cybermark‎, 05-14-2016 03:08 PM
    • Replies: 1
    • Views: 1,357
    05-15-2016, 04:51 AM Go to last post
  8. Are the Observations in A Random Sample Independent?

    Hi, guys. I am learning the t-test on my own. The assumptions of t-test have been confusing to me. The assumptions included "A random...

    Started by Evan918‎, 05-13-2016 02:31 AM
    independent observations, random sample, statistics
    • Replies: 3
    • Views: 2,040
    05-15-2016, 03:45 AM Go to last post
  9. Testing the mean of a group with...

    Is it correct to compare the mean of a subsample with the entire sample? or I have to compare the mean of a subsample with the other subsamples...

    Started by DuarteR‎, 05-13-2016 04:13 PM
    • Replies: 1
    • Views: 1,470
    05-14-2016, 03:33 PM Go to last post
  10. Rejection Sampling

    Hello! I am student of statistics from Mexico and I always like to deeply understand the logic of the subjects in each of my courses. This time...

    Started by Eddie_th12‎, 05-14-2016 02:24 PM
    • Replies: 0
    • Views: 1,432
    05-14-2016, 02:24 PM Go to last post
  11. ritical value approach

    I need help for this question The sponsors of televisions shows targeted at the market of 5 - 8 year olds want to test the hypothesis that...

    Started by chen‎, 05-13-2016 02:55 AM
    • Replies: 0
    • Views: 1,779
    05-13-2016, 02:55 AM Go to last post
  12. Mixed logit

    Can anyone please help with mixed logit model? I have 3 choice of hours. How does it work in general?

    Started by Lena‎, 05-12-2016 03:46 PM
    • Replies: 0
    • Views: 1,491
    05-12-2016, 03:46 PM Go to last post
  13. Results of Sign Test

    Hi all, I was hoping somebody could help me with understanding the results of a sign test. I am not a statistician but a medic trying to...

    Started by mgjvegas‎, 05-11-2016 03:08 PM
    • Replies: 2
    • Views: 1,959
    05-12-2016, 02:17 PM Go to last post
  14. Which statistical test should I be using?

    Hi, im currently doing a dissertation on how people body condition score underweight dogs differently to overweight dogs so I have conducted a survey...

    Started by RichTS7‎, 05-11-2016 05:20 PM
    • Replies: 1
    • Views: 1,622
    05-12-2016, 02:14 AM Go to last post
  15. Trend Line Help

    I'm struggling with the problem below and really need a starting place. Can someone please explain how they knew which formula to use? How do I...

    Started by trevora0‎, 05-10-2016 09:23 PM
    • Replies: 3
    • Views: 2,343
    05-11-2016, 05:24 PM Go to last post
  16. finding p value

    Here's what is given: SE of .1 Average mean: 5.4 ft (100 penguins tested) significance level: 5% (0.05) find p-value and testis there is...

    Started by Wooshj‎, 05-10-2016 03:46 PM
    • Replies: 1
    • Views: 1,213
    05-10-2016, 04:33 PM Go to last post
  17. Statpedia: Looking for feedback & help

    Hello, My team and I recently created an open project for people to create charts in a super easy way. I thought I would share it with this group...

    Started by statpedia‎, 05-09-2016 06:16 PM
    beginners, charts, data visualization, help needed, stats
    • Replies: 0
    • Views: 1,225
    05-09-2016, 06:16 PM Go to last post
  18. ZINB & interpretation moderating effects

    Hello everyone, I have a model with a dependent variable (Y), an independent variable (X), and three moderator variables (M1, M2, M3). Using a...

    Started by stat1990‎, 05-09-2016 09:46 AM
    • Replies: 2
    • Views: 1,606
    05-09-2016, 01:50 PM Go to last post
  19. Question Average delay

    Dear All, i have a problem with calculate a statistics value. So, consider we have two classes,: class A, class B. every classes have 10 values....

    Started by khoubeil‎, 05-07-2016 06:29 AM
    average delay, nan value, statistics
    • Replies: 0
    • Views: 1,433
    05-07-2016, 06:29 AM Go to last post
  20. Exclamation wald test in stata

    Hello everyone! I googled my issue but I am not sure about the answer i got. I want to perform a wald test to test each coeff. in my multiple...

    Started by Lisa92‎, 05-07-2016 05:56 AM
    • Replies: 0
    • Views: 1,715
    05-07-2016, 05:56 AM Go to last post
  21. Comparing two samples

    Hello, I'm working on a paper on Social media usage among university professors, and I'm comparing between two major networks (Facebook, Twitter),...

    Started by iha2005‎, 05-07-2016 04:47 AM
    comparing groups, comparing samples
    • Replies: 0
    • Views: 1,138
    05-07-2016, 04:47 AM Go to last post
  22. How does OLS regression related to generalise linear modelling

    Hi, I need to understand how OLS regression relates to generalise linear modelling. Does the relationship only exist when the assumptions of...

    Started by Mid‎, 05-06-2016 05:06 PM
    generalised linear models, ols regression
    • Replies: 0
    • Views: 910
    05-06-2016, 05:06 PM Go to last post
  23. Understanding A Basic Probability

    Hi everyone, I'm new here, so I apologize if this post is in the wrong forum or of incorrect format. So my question is; Assuming Person A has...

    Started by Hammy‎, 05-06-2016 01:56 PM
    • Replies: 2
    • Views: 1,147
    05-06-2016, 02:30 PM Go to last post
  24. Chi reasonable?

    Dear Statistic-Professionals, I'm new to statistics and i have got a problem, that i cannot really solve on my own. I hope someone is out there...

    Started by BigBasit‎, 05-05-2016 02:53 PM
    • Replies: 1
    • Views: 3,703
    05-06-2016, 12:23 AM Go to last post
  25. Standard deviation comparison question

    Two college roommates have each committed to donating to charity each week for the next year. The roomates' weekly incomes are independent of each...

    Started by samuelkim16‎, 05-05-2016 08:14 PM
    ap stats, homework help
    • Replies: 1
    • Views: 5,584
    05-05-2016, 10:38 PM Go to last post
  26. Question Analysis of covariance (ANCOVA)

    In my research in literature, I read that categorical covariates (eg. sex, race) can be adjusted in the analysis of covariance (ANCOVA), but the...

    Started by Cleliani da Silva‎, 05-04-2016 02:28 PM
    • Replies: 1
    • Views: 2,026
    05-05-2016, 07:11 AM Go to last post
  27. Component Failure Contributing to System Failure

    I have a system with components A, B, and C. The system operates if components A and C or B and C operate. I need to find the probability that the...

    Started by statssos‎, 05-04-2016 07:16 PM
    • Replies: 0
    • Views: 1,274
    05-04-2016, 07:16 PM Go to last post
  28. Reliable Change Index

    Hello, If I have a sample of 137 individuals with three assessment results (first, 1YR follow-up and 2-Yr follow-up), can I calculate the Reliable...

    Started by AnneS‎, 05-04-2016 05:18 PM
    • Replies: 0
    • Views: 2,290
    05-04-2016, 05:18 PM Go to last post
  29. Exclamation Power Analysis

    Hi there, I am currently writing a statistics report which has to cover 2 questions: Firstly, what the correlation is between two different test...

    Started by roseberry‎, 05-04-2016 05:00 AM
    correlation, correlation analysis, post hoc, power analysis, psychology
    • Replies: 0
    • Views: 1,321
    05-04-2016, 05:00 AM Go to last post
  30. Which test should I use?

    I want to see if the age distribution is the same in my test and control group. First I wanted to do a independent T-test, but my age variant is not...

    Started by June147‎, 05-04-2016 02:40 AM
    • Replies: 0
    • Views: 1,573
    05-04-2016, 02:40 AM Go to last post
  31. Medical stats - which statistical test to use? Stuck!

    Dear all, I need some help with determining what statistical test to use for the following data. I have a column for age of patient and I want...

    Started by DrHarry‎, 05-02-2016 06:50 PM
    • Replies: 3
    • Views: 1,708
    05-04-2016, 12:19 AM Go to last post
  32. Matched case-control: Test for baseline characteristics

    Hi, I have a dataset of a matched case-control study with 12 cases. There are two matched controls for each case, totalling 36 subjects....

    Started by teapot‎, 05-03-2016 03:30 AM
    • Replies: 2
    • Views: 1,585
    05-03-2016, 05:27 PM Go to last post
  33. Comparing % of other studies with your own?

    Hi guys, I'm really sorry if this is in the wrong section. I'm struggling with knowing which test to use or if there is any? I have conducted...

    Started by tc2‎, 05-03-2016 12:14 PM
    • Replies: 1
    • Views: 1,176
    05-03-2016, 12:56 PM Go to last post
  34. How to deal with unequal survey response rate?

    Hi & thank you all in advance for your help! I sent out a survey to 3 school districts in New York state. District A is large, district B is...

    Started by florencegorgi‎, 05-03-2016 10:35 AM
    • Replies: 3
    • Views: 1,781
    05-03-2016, 12:12 PM Go to last post
  35. Question A difficult SPSS question

    I have a data set in which household is as a unit (wide format) One of the variable is about relationship between household members, below is the...

    Started by John Miz‎, 05-02-2016 08:47 AM
    • Replies: 0
    • Views: 1,371
    05-02-2016, 08:47 AM Go to last post
  36. Apriori sample size calculation for mixed ANOVA

    Hello, I'm trying to calculate the required sample size for my study to show significant effects. I'm expecting to analyse my data using a series of...

    Started by cnelson‎, 05-02-2016 06:15 AM
    • Replies: 0
    • Views: 1,666
    05-02-2016, 06:15 AM Go to last post
  37. T-Test for 2 Independent Means or T Test for 2 Dependent Means

    I am comparing two blood glucose meters. I am using a blood sample from the same finger, at the same time using two different blood glucose meters....

    Started by a1985k‎, 04-30-2016 10:33 PM
    • Replies: 3
    • Views: 1,629
    05-01-2016, 09:43 PM Go to last post
  38. Which stat test to use?

    I watched two people blink three times a day for seven days. The hypothesis is that they blink significantly more in the morning compared to the...

    Started by humanbeing‎, 04-29-2016 09:32 PM
    • Replies: 7
    • Views: 2,037
    05-01-2016, 05:04 PM Go to last post
  39. Segmentation analysis: Correct test to use?

    As part of a larger study, we have collected a wealth of data on the interactions customers engage in when buying and using a service. We have...

    Started by Niklas B.‎, 05-01-2016 08:21 AM
    clustering, segmentation
    • Replies: 0
    • Views: 1,228
    05-01-2016, 08:21 AM Go to last post
  40. Help please- experiment design

    Hi all, I am having real trouble working out the best way to test what I want to test. Bear in mind that what I have to produce is a research...

    Started by Owsley‎, 01-04-2016 10:12 AM
    • Replies: 5
    • Views: 2,185
    04-30-2016, 11:08 PM Go to last post
  41. Which Stats Test To Use? ~~Desperately seeking help!

    Hello internet! I'm concluding data analysis on a social psych study, but I've hit a wall. I don't know which test would be best to analyze this...

    Started by lil_1‎, 04-29-2016 11:24 PM
    • Replies: 2
    • Views: 1,781
    04-30-2016, 07:13 PM Go to last post
  42. Minimum P to sample boxes

    I have N boxes, each of which may or may not contain a ball. I want to know how many boxes have balls by sampling the boxes in the following way. ...

    Started by dalibocai‎, 04-30-2016 09:35 AM
    binomial distribution, confidence-interval, variance
    • Replies: 0
    • Views: 1,309
    04-30-2016, 09:35 AM Go to last post
  43. Which statistical test to use?

    Hi, My Chinese friend and I are trying to answer the following question: What are the mean weasel body weight per habitat and age class, for...

    Started by Peter007‎, 04-28-2016 11:42 AM
    mean 1, statistical test
    • Replies: 2
    • Views: 1,466
    04-29-2016, 07:41 PM Go to last post
  44. Combining two Likert responses into one composite variable

    Hello, I've been reading up on this topic for hours and haven't found a solution to my problem. I ran a survey which had 10 questions, split into...

    Started by chrish6754‎, 04-29-2016 05:45 PM
    • Replies: 0
    • Views: 1,364
    04-29-2016, 05:45 PM Go to last post
  45. Calculating LC50 Using Probit Analysis

    Hi everyone, I'm doing a project at college assessing the 96 hour LC50 value of microplastics upon brine shrimp. If it's okay, I just want some...

    Started by Xagan‎, 04-29-2016 04:42 PM
    • Replies: 0
    • Views: 2,042
    04-29-2016, 04:42 PM Go to last post
  46. Planned Orthogonal Comparison Type I Error Rate and the Number of Independent Cntrst

    Hi! I am confused about Type I error rate and the number of planned independent contrasts in Planned Orthogonal Comparisons in one-way ANOVA. If we...

    Started by ysnylcn‎, 04-29-2016 10:53 AM
    • Replies: 0
    • Views: 1,048
    04-29-2016, 10:53 AM Go to last post
  47. Sampling Rate: how does it work?

    What is happening in practice whenever I am "taking a sampling rate of 10%" on a population of 1'000'000 with a cell size of 30 ? if the cell size...

    Started by Clemente Cortile‎, 04-29-2016 05:57 AM
    • Replies: 0
    • Views: 2,043
    04-29-2016, 05:57 AM Go to last post
  48. Standard Error associated to a variable percentage

    Context: I am a programmer, not a statistician, and I have only some vague ideas of statistical concepts. Also, my english is far from perfect, be...

    Started by Wentu‎, 04-29-2016 03:21 AM
    percentage, standard error
    • Replies: 0
    • Views: 1,586
    04-29-2016, 03:21 AM Go to last post
  49. Is Sea Level Rise Data from NOAA an Areal Data?

    I am working on sea level rise and I collected the data from NOAA. In the "meta", they describe the data is obtained by : Hourly : ...

    Started by Cynderella‎, 04-29-2016 12:32 AM
    environmental data, spatial analysis, spatial data, spatial statistics, spatio-temporal
    • Replies: 0
    • Views: 1,160
    04-29-2016, 12:32 AM Go to last post
  50. Variance of Y question

    Hi all, I'm struggling on a variance of Y question that goes like this: Let X follow an exponential distribution with a mean of theta. Let Y =...

    Started by jpierce‎, 04-28-2016 05:43 PM
    • Replies: 2
    • Views: 1,416
    04-28-2016, 09:17 PM Go to last post
  51. Point null hypothesis in Bayesian statistics

    Let X\sim N(\theta,1) and 5 independent observations X=(4.9,5.6,5.1,4.6,3.6). The prior probability that \theta=4.01 is 0.5. The remain values of...

    Started by askazy‎, 04-28-2016 05:40 PM
    • Replies: 0
    • Views: 1,350
    04-28-2016, 05:40 PM Go to last post
  52. Comparing groups - which test should I use - two categorical variables

    Hello, I have two groups (control and a test group) and I want to test if the gender distribution is the same in both groups. So I want know that...

    Started by June147‎, 04-28-2016 03:37 PM
    categorical variables
    • Replies: 1
    • Views: 1,362
    04-28-2016, 04:02 PM Go to last post
  53. Which analysis to use?

    Hi! I have a design with two categorical iv and one continuous iv with a continuous dv. I wanted to see if there was a main effect or interaction...

    Started by vl11‎, 04-27-2016 02:36 PM
    • Replies: 1
    • Views: 1,248
    04-28-2016, 10:59 AM Go to last post
  54. Post Some basic questions about a econometric analysis of paneldata

    For a research project in economics, I want to study the several determinants that affect the decision to enter the private rental housing market in...

    Started by TomasSmith‎, 04-28-2016 05:04 AM
    • Replies: 0
    • Views: 1,127
    04-28-2016, 05:04 AM Go to last post
  55. Significant

    So I have this data set and when looking for a relationship between two variables i created the attached plot. Then i started to fit a model to...

    Started by Prometheus‎, 04-26-2016 07:11 AM
    • Replies: 8
    • Views: 1,457
    04-28-2016, 03:52 AM Go to last post
  56. Sigma-algebra (the proof)

    prove that if {B,B,B,...} is a countable partition of X, then the collection of all unions of sets in the partition (including the empty set) is...

    Started by kolawole tosin‎, 04-27-2016 01:30 PM
    • Replies: 0
    • Views: 1,322
    04-27-2016, 01:30 PM Go to last post
  57. Linear Regression Multiple Choice Questions: Please Help!!

    I have attached my practice sample final for my college statistics course on linear regression. All of the answers are multiple choice, and I need...

    Started by PleaseHelpASAP‎, 04-26-2016 10:34 PM
    • Replies: 0
    • Views: 951
    04-26-2016, 10:34 PM Go to last post
  58. Questions on Regressions and F/T Tests

    Hello, So I am basically doing this Statistics assignment for extra credit and I am totally confused. http://i.imgur.com/8BXoGNL.png...

    Started by delusionalstudent‎, 04-26-2016 08:02 PM
    • Replies: 0
    • Views: 1,117
    04-26-2016, 08:02 PM Go to last post
  59. McNemar's Test and sample size: how to estimate discordant pairs?

    This post was in the biostats forum, but a quick review of the previous McNemar's topics shows most were posted in here. I want to use McNemar's...

    Started by Aquaman29‎, 04-26-2016 02:57 PM
    • Replies: 0
    • Views: 1,394
    04-26-2016, 02:57 PM Go to last post
  60. What are the important test for "Time series"

    Hi there, I need help with analysing time series. What are the important test for "Time series" ? Thanks

    Started by Rob200121‎, 04-25-2016 04:01 AM
    • Replies: 2
    • Views: 1,842
    04-26-2016, 07:50 AM Go to last post

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