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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 200,111
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 68,420
09-30-2005, 09:44 AM
1. ### 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...

• Replies: 0
• Views: 1,269
05-16-2016, 07:41 AM
2. ### 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...

• Replies: 0
• Views: 1,232
05-16-2016, 04:36 AM
3. ### 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...

• Replies: 0
• Views: 1,767
05-15-2016, 12:55 PM
4. ### Rand(vars)

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

• Replies: 0
• Views: 1,041
05-15-2016, 08:58 AM
5. ### 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...

• Replies: 3
• Views: 2,040
05-15-2016, 03:45 AM
6. ### 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...

• Replies: 1
• Views: 1,470
05-14-2016, 03:33 PM
7. ### 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...

• Replies: 0
• Views: 1,432
05-14-2016, 02:24 PM
8. ### 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...

• Replies: 0
• Views: 1,779
05-13-2016, 02:55 AM
9. ### Mixed logit

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

• Replies: 0
• Views: 1,491
05-12-2016, 03:46 PM
10. ### 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...

• Replies: 2
• Views: 1,959
05-12-2016, 02:17 PM
11. ### 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...

• Replies: 1
• Views: 1,622
05-12-2016, 02:14 AM
12. ### 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...

• Replies: 3
• Views: 2,343
05-11-2016, 05:24 PM
13. ### 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...

• Replies: 1
• Views: 1,213
05-10-2016, 04:33 PM
14. ### 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...

• Replies: 0
• Views: 1,225
05-09-2016, 06:16 PM
15. ### 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....

• Replies: 0
• Views: 1,433
05-07-2016, 06:29 AM
16. ### 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...

• Replies: 0
• Views: 1,715
05-07-2016, 05:56 AM
17. ### 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),...

• Replies: 0
• Views: 1,138
05-07-2016, 04:47 AM
18. ### 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...

• Replies: 0
• Views: 910
Mid
05-06-2016, 05:06 PM
19. ### 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...

• Replies: 2
• Views: 1,147
05-06-2016, 02:30 PM
20. ### Chi² 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...

• Replies: 1
• Views: 3,703
05-06-2016, 12:23 AM
21. ### 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...

• Replies: 1
• Views: 5,584
05-05-2016, 10:38 PM
22. ### 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...

• Replies: 1
• Views: 2,026
05-05-2016, 07:11 AM
23. ### 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...

• Replies: 0
• Views: 1,274
05-04-2016, 07:16 PM
24. ### 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...

• Replies: 0
• Views: 2,290
05-04-2016, 05:18 PM
25. ### 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...

• Replies: 0
• Views: 1,321
05-04-2016, 05:00 AM
26. ### 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...

• Replies: 0
• Views: 1,573
05-04-2016, 02:40 AM
27. ### 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...

• Replies: 3
• Views: 1,708
05-04-2016, 12:19 AM
28. ### 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....

• Replies: 2
• Views: 1,585
05-03-2016, 05:27 PM
29. ### 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...

• Replies: 1
• Views: 1,176
05-03-2016, 12:56 PM
30. ### 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...

• Replies: 3
• Views: 1,781
05-03-2016, 12:12 PM
31. ### 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...

• Replies: 0
• Views: 1,371
05-02-2016, 08:47 AM
32. ### 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...

• Replies: 0
• Views: 1,666
05-02-2016, 06:15 AM
33. ### 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....

• Replies: 3
• Views: 1,629
05-01-2016, 09:43 PM
34. ### 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...

• Replies: 7
• Views: 2,037
05-01-2016, 05:04 PM
35. ### 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...

• Replies: 0
• Views: 1,228
05-01-2016, 08:21 AM
36. ### 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...

• Replies: 5
• Views: 2,185
04-30-2016, 11:08 PM
37. ### 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...

• Replies: 2
• Views: 1,781
04-30-2016, 07:13 PM
38. ### 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. ...

• Replies: 0
• Views: 1,309
04-30-2016, 09:35 AM
39. ### 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...

• Replies: 2
• Views: 1,466
04-29-2016, 07:41 PM
40. ### 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...

• Replies: 0
• Views: 1,364
04-29-2016, 05:45 PM
41. ### 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...

• Replies: 0
• Views: 2,042
04-29-2016, 04:42 PM
42. ### 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...

• Replies: 0
• Views: 1,048
04-29-2016, 10:53 AM
43. ### 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...

• Replies: 0
• Views: 2,043
04-29-2016, 05:57 AM
44. ### 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...

• Replies: 0
• Views: 1,586
04-29-2016, 03:21 AM
45. ### 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 : ...

• Replies: 0
• Views: 1,160
04-29-2016, 12:32 AM
46. ### 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 =...

• Replies: 2
• Views: 1,416
04-28-2016, 09:17 PM
47. ### 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...

• Replies: 0
• Views: 1,350
04-28-2016, 05:40 PM
48. ### 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...

• Replies: 1
• Views: 1,362
04-28-2016, 04:02 PM
49. ### 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...

• Replies: 1
• Views: 1,248
04-28-2016, 10:59 AM
50. ### Sigma-algebra (the proof)

prove that if {B¹,B²,B³,...} is a countable partition of X, then the collection of all unions of sets in the partition (including the empty set) is...

• Replies: 0
• Views: 1,322
04-27-2016, 01:30 PM
51. ### 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...

• Replies: 0
• Views: 1,117
04-26-2016, 08:02 PM
52. ### 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...

• Replies: 0
• Views: 1,394
04-26-2016, 02:57 PM
53. ### 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

• Replies: 2
• Views: 1,842
04-26-2016, 07:50 AM

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