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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: 123,750
    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: 34,589
    09-30-2005, 09:44 AM Go to last post
  1. 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, Today 05:00 AM
    correlation, correlation analysis, post hoc, power analysis, psychology
    • Replies: 0
    • Views: 35
    Today, 05:00 AM Go to last post
  2. 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, Today 02:40 AM
    • Replies: 0
    • Views: 44
    Today, 02:40 AM Go to last post
  3. 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: 131
    Today, 12:19 AM Go to last post
  4. 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, Yesterday 03:30 AM
    • Replies: 2
    • Views: 90
    Yesterday, 05:27 PM Go to last post
  5. 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, Yesterday 12:14 PM
    • Replies: 1
    • Views: 88
    Yesterday, 12:56 PM Go to last post
  6. 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, Yesterday 10:35 AM
    • Replies: 3
    • Views: 78
    Yesterday, 12:12 PM Go to last post
  7. 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: 64
    05-02-2016, 08:47 AM Go to last post
  8. 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: 50
    05-02-2016, 06:15 AM Go to last post
  9. 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: 116
    05-01-2016, 09:43 PM Go to last post
  10. 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: 149
    05-01-2016, 05:04 PM Go to last post
  11. 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: 87
    05-01-2016, 08:21 AM Go to last post
  12. 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 09:12 AM
    • Replies: 5
    • Views: 383
    04-30-2016, 11:08 PM Go to last post
  13. 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: 125
    04-30-2016, 07:13 PM Go to last post
  14. 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: 83
    04-30-2016, 09:35 AM Go to last post
  15. 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: 133
    04-29-2016, 07:41 PM Go to last post
  16. 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: 92
    04-29-2016, 05:45 PM Go to last post
  17. 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: 78
    04-29-2016, 04:42 PM Go to last post
  18. 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: 73
    04-29-2016, 10:53 AM Go to last post
  19. 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: 95
    04-29-2016, 05:57 AM Go to last post
  20. 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: 98
    04-29-2016, 03:21 AM Go to last post
  21. 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: 74
    04-29-2016, 12:32 AM Go to last post
  22. 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: 142
    04-28-2016, 09:17 PM Go to last post
  23. 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: 84
    04-28-2016, 05:40 PM Go to last post
  24. 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: 120
    04-28-2016, 04:02 PM Go to last post
  25. 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: 103
    04-28-2016, 10:59 AM Go to last post
  26. 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: 72
    04-28-2016, 05:04 AM Go to last post
  27. 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: 241
    04-28-2016, 03:52 AM Go to last post
  28. 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: 64
    04-27-2016, 01:30 PM Go to last post
  29. 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: 95
    04-26-2016, 10:34 PM Go to last post
  30. 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: 80
    04-26-2016, 08:02 PM Go to last post
  31. 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: 71
    04-26-2016, 02:57 PM Go to last post
  32. 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: 134
    04-26-2016, 07:50 AM Go to last post
  33. One Way Anova...

    In one way anova, derive an estimator for the sum of the effects (alpha ) weighted by constant (h). sum(hi * alpha i) where i is from 1,2...a ...

    Started by brooke‎, 04-25-2016 01:48 AM
    • Replies: 1
    • Views: 128
    04-25-2016, 02:11 PM Go to last post
  34. Need Urgent Help - Why multiple and Simple Regression Out Puts Different

    Hi Im a new comer to statistics, im using SPSS, my dependent variable is Purchase Intention and Independent variable is Security..why the Sig....

    Started by chamath‎, 04-25-2016 12:57 PM
    • Replies: 2
    • Views: 112
    04-25-2016, 02:06 PM Go to last post
  35. Testing for spatial autocorrelation in residuals - time series

    Hello :) I have a ~25 year dataset of annual count of species abundance in several traps. Within a year, the abundance in a trap might be...

    Started by Kjian‎, 04-25-2016 01:11 PM
    • Replies: 0
    • Views: 78
    04-25-2016, 01:11 PM Go to last post
  36. GMM to predict the mean and the variance of a variable

    Dear members; I identified a set of variables that are related to currency returns. Suppose that I have 3 state variables and 10 currency returns. I...

    Started by Nour‎, 04-25-2016 04:31 AM
    • Replies: 4
    • Views: 141
    04-25-2016, 12:43 PM Go to last post
  37. Question Interpreting repeated measures ANOVA(s)

    Hi everyone! I did a lot of calculations lately but sometimes I just don't get what those values are really saying. And since two heads are better...

    Started by Vora‎, 04-25-2016 11:46 AM
    mood, odor, repeated measure anova
    • Replies: 0
    • Views: 77
    04-25-2016, 11:46 AM Go to last post
  38. Can I combine slope values of multiple participants to generate a mean slope value?

    Hi I am preparing a systematic review of some studies in education. I need help in interpreting some stats reported in one of the studies. The...

    Started by hwc001‎, 04-25-2016 09:36 AM
    • Replies: 0
    • Views: 72
    04-25-2016, 09:36 AM Go to last post
  39. Statistical test for effect of IV on DV between groups

    Dear all, I have a question regarding the statistical test I have to use for the following relation: I want to study what the effect of size on...

    Started by Suzanerasmus‎, 04-24-2016 05:25 AM
    • Replies: 1
    • Views: 131
    04-24-2016, 08:37 AM Go to last post
  40. Newbie stats help: How to safely interpret Total Variance Explained -Factor analysis

    Hi all, I have run a factor analysis to test reliability and validity of an established scale and found simple structure with my own sample,...

    Started by kimkat‎, 04-23-2016 11:39 PM
    factor analysis, factors, interpretation, total variance explained
    • Replies: 0
    • Views: 121
    04-23-2016, 11:39 PM Go to last post
  41. Regression Analysis Help!!

    Hi, I'm absolutely useless at statistics but I am investigating the relationship between different land use categories, and so on, and reported...

    Started by MMHoffmann‎, 04-23-2016 01:15 PM
    • Replies: 0
    • Views: 135
    04-23-2016, 01:15 PM Go to last post
  42. Need some baby stats help

    I have a final in a couple of weeks, and a lot of homework due soon, but I am super confused about how to do a few things, and my professor is not...

    Started by Babyweenus‎, 04-22-2016 12:16 PM
    • Replies: 3
    • Views: 223
    04-22-2016, 08:32 PM Go to last post
  43. Smile Help - is a collection of studies normally distributed if the n >150? false positives

    Hi, I have a collection of medical trials, all for different conditions and different medications. There are 160 in all. They have all different...

    Started by Sustat‎, 04-14-2016 02:13 AM
    • Replies: 4
    • Views: 222
    04-22-2016, 04:22 PM Go to last post
  44. Need help determining proper method for analyzing Responses to Alerts

    Hi, I've been struggling with some data provided to me by a coworker. Specifically, we have a sepsis alert that indicates that a patient meets the...

    Started by numbersguy‎, 04-22-2016 12:53 PM
    • Replies: 0
    • Views: 102
    04-22-2016, 12:53 PM Go to last post
  45. run chi square individually for trials rather than subject groups?

    Hi all, I am a newbie here and decided to register because I have a random question that I have been thinking about for a while now. It seems quite...

    Started by LisaLondon2‎, 04-22-2016 07:04 AM
    • Replies: 0
    • Views: 85
    04-22-2016, 07:04 AM Go to last post
  46. Smile nominal (yes/no) and distance. What test to use to proof correlation?

    Hi all, My boss has a list that shows the interest of people for a new venue (interest? Answer: yes or no) and the distance to that possible...

    Started by Hajo‎, 04-20-2016 12:03 PM
    • Replies: 5
    • Views: 215
    04-21-2016, 08:48 AM Go to last post
  47. covariance average

    Hi all. CV measures are often used as quality controls for quantitative laboratory assays. How can I calculate simply averaging CV values...

    Started by biotechno‎, 04-21-2016 04:59 AM
    • Replies: 0
    • Views: 130
    04-21-2016, 04:59 AM Go to last post
  48. Example(s) of an interval scale

    Temperature in Fahrenheit or Celsius is almost always used as the example of an interval scale. Another one is Year (e.g. birth year) although one...

    Started by blubblub‎, 04-21-2016 01:51 AM
    interval scale, measurement levels, zero point
    • Replies: 2
    • Views: 136
    04-21-2016, 04:12 AM Go to last post
  49. Moderating Variable in AMOS 22

    Hi, I need to analyze research model with AMOS 22. In my research model, I use moderating variable. Can anyone tell me how to draw this...

    Started by mahfuzra29‎, 04-21-2016 03:03 AM
    • Replies: 0
    • Views: 114
    04-21-2016, 03:03 AM Go to last post
  50. Using statistical methods to find threshold/base line?

    Hello everyone, I am a newbie to statistics and would like to seek some advice. Are there any statistical methods that can be used to determine...

    Started by nizze‎, 04-19-2016 07:47 PM
    • Replies: 4
    • Views: 246
    04-21-2016, 01:55 AM Go to last post
  51. Finding the probability of committing a type II error

    I'm not sure If I understand what (b) is asking. Does it mean that the alternative hypothesis will be p<0.3, p<0.4, and p<0.5??? And I have to find...

    Started by asilvester635‎, 04-19-2016 06:21 PM
    • Replies: 0
    • Views: 169
    04-19-2016, 06:21 PM Go to last post
  52. Critical value

    I have been doing this problem for a while now and I know how to find a critical value but I cant get any of the answer choices available. The...

    Started by AustV‎, 04-19-2016 05:53 PM
    • Replies: 0
    • Views: 119
    04-19-2016, 05:53 PM Go to last post
  53. Is TTEST valid for statistical diff between systems when 1 sytem has known distrib?

    What statistics tests would you need to detect if there is statistically significant difference between the following two systems? The first system...

    Started by ep4talkstats‎, 04-16-2016 11:31 AM
    • Replies: 3
    • Views: 203
    04-19-2016, 05:15 PM Go to last post
  54. Independent t-test - interpreting significance if sizes of samples differ greatly

    Hello, I ran an independent t-test on two samples (composite scores of a health assessment for two different groups of youth by age category). ...

    Started by AnneS‎, 04-19-2016 11:18 AM
    • Replies: 3
    • Views: 125
    04-19-2016, 02:49 PM Go to last post
  55. Strange licence plate question.

    Can someone with significant math experience please answer this while telling how you got the answer: Suppose that a licence plate consists of 3...

    Started by Humdood‎, 04-19-2016 02:48 PM
    • Replies: 0
    • Views: 88
    04-19-2016, 02:48 PM Go to last post
  56. Lightbulb Change of moment

    Hello everyone, I have a very basic question, but you could really help me out a lot here. In the image (attachment) you can see a force F1 with...

    Started by arnout‎, 04-19-2016 02:41 PM
    • Replies: 0
    • Views: 86
    04-19-2016, 02:41 PM Go to last post
  57. Question Advice on how to tackle these questions / Which methods to use

    Hi - Could I get some advice of which type of statistics I should use to represent my data on the best possible way? I have 76 participants with...

    Started by ba10s118‎, 04-19-2016 07:18 AM
    • Replies: 0
    • Views: 130
    04-19-2016, 07:18 AM Go to last post
  58. Wich function do i use?

    Hello all, Im new to SPSS and i have a question about wich function i need to use. I have 3 variables in my SPSS: School year, year figure and...

    Started by Akkers1990‎, 04-19-2016 07:01 AM
    • Replies: 0
    • Views: 93
    04-19-2016, 07:01 AM Go to last post
  59. F statistic vs T statistic

    hello, I appreciate your help, I have a variable that I can divide to 3 groups: A, B, C. I want to check if the difference between the groups...

    Started by yaelcohen‎, 04-18-2016 08:32 AM
    • Replies: 0
    • Views: 145
    04-18-2016, 08:32 AM Go to last post
  60. scatterplot multiple regression analysis

    I performed a multivariable linear regression analysis with one dependent variable and three independent variables. Two of the three independent...

    Started by spss2016..‎, 04-18-2016 06:56 AM
    • Replies: 0
    • Views: 98
    04-18-2016, 06:56 AM Go to last post

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