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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: 200,352
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: 68,570
09-30-2005, 09:44 AM
1. ### What kind of test should I use?

I have 50 test items for 1000 students, each student answered 30 of them. I would like to find out whether the rate of correctness of items is...

• Replies: 3
• Views: 2,433
11-28-2016, 03:13 AM
2. ### Compute variables? Number of births by year

Hello - I am working through a university statistics course without prior knowledge of statistics, so I apologize if the description of my question...

• Replies: 0
• Views: 1,637
11-27-2016, 06:14 AM
3. ### Random survival forests

Would like to hear if any one has used this method for survival analysis. How does it compare with COX models while building a model with several...

• Replies: 4
• Views: 2,874
11-25-2016, 08:29 PM
4. ### Regression coefficient for interaction

Hi! I have a homework question that on the face looks rather simple to me, but I want to check with people who may have greater statistics...

• Replies: 2
• Views: 1,465
11-25-2016, 04:58 PM
5. ### Voter Engagement Methodology

I need some help with measuring voter engagement among native and naturalized citizens depending on their respective race. dependent variable/s:...

• Replies: 1
• Views: 1,888
11-25-2016, 06:35 AM
6. ### Comparing the intercept and the estimate coefficient in time-series regression

Hi there. I'm still a bit of a novice, and I'm wondering if anyone could advice me if this is empirically "responsible"? So essentially I've...

• Replies: 0
• Views: 2,210
11-24-2016, 11:46 AM
7. ### Sample Size Calculation/power calcuation for retrospective study

Hi all, I recently completed a study looking at hospital records over a 5 year period (fixed population of participants based on study period)....

• Replies: 0
• Views: 1,723
11-24-2016, 10:04 AM
8. ### Assignment

Can someone help on this? A statistics professor gave three quizzes leading up to the first test in his class. The quiz grades and test grade for...

• Replies: 0
• Views: 2,556
11-24-2016, 06:41 AM
9. ### Meta-analysis - mean (target mean correction)

I had a statistical question which I'll mention here if you have time to have a look at it then I'd be very grateful for your thoughts. Im...

• Replies: 1
• Views: 2,283
11-23-2016, 10:42 PM
10. ### t-test for large sample size - bike hire data

Hello everyone, I'm taking a graduate-level statistics course at the University of Glasgow which includes a methods assignment. The assignment...

• Replies: 2
• Views: 2,499
11-22-2016, 06:13 PM
11. ### Technical efficiency

Hello to everyone , i'm new in this forum , i would like to know if there is a relationship between the coefficient and the std in the calculation of...

• Replies: 2
• Views: 1,249
11-22-2016, 06:02 PM
12. ### Identifying Effect size in Power Analysis

I have a set of data for a water quality parameter on which is used to compute Rank Spearman Trend. I am interested to know whether the number of...

• Replies: 5
• Views: 2,813
11-22-2016, 10:06 AM
13. ### lottery question

Connecticut has a lottery game called Cash5. There are 35 numbers to choose from. You have to select 5 numbers. 5 numbers are then drawn...

• Replies: 1
• Views: 1,572
11-22-2016, 08:16 AM
14. ### SEM / path model = visualization of a hierarchical regression?

Hi everybody, nice to have found such a useful forum! And I hope someone can help me with my statistical problem! I have the following...

• Replies: 3
• Views: 1,708
11-22-2016, 06:55 AM
15. ### Bootstrap procedure to test difference between correlation coefficients

Hi everyone, I have two correlation coefficients (r1 and r2), obtained within the same sample (20 subjects). My aim is to test it they are...

• Replies: 5
• Views: 2,372
11-22-2016, 05:07 AM
16. ### Significant Difference between Students' Evaluation and Teachers' Evaluation

Good day! I am working with a research paper regarding the significant difference between the students' evaluation and teachers' evaluation in...

• Replies: 1
• Views: 1,297
11-22-2016, 03:25 AM
17. ### Trying to find the root cause of a communication issue.

Good Morning.. I have four host computers which hold a variety of virtual servers. We are seeing intermittent communication slowness when performing...

• Replies: 0
• Views: 1,766
11-21-2016, 01:09 PM
18. ### Which statistical test to use?

In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

• Replies: 2
• Views: 1,601
11-21-2016, 11:11 AM
19. ### p-value and hypothesis testing

Hi, I've one question concerning the p-value. I've run a regression in STATA with one independent variable (x1) with a small positive coefficient and...

• Replies: 3
• Views: 1,524
11-21-2016, 09:05 AM
20. ### Recalculate ratings

Hi. I wish to compare 3 products that have the follwing scores 1) 86/100 I.e 0.86 from 1200 ratings 2) 78/100 from 100 ratings 3) 81/100 from...

• Replies: 0
• Views: 1,815
11-20-2016, 04:06 AM
21. ### Anova Repeated Measures to compare three different variables?

In a psychology research (not published yet) an Anova Repeated Measures test was used to compare three different variables measured (at the same...

• Replies: 0
• Views: 1,077
11-20-2016, 02:04 AM
22. ### Sensitivity/Specificity of a Test Procedure Question

Hi everyone, I'm a bit unsure on how to do this problem. It's mainly about sensivity, specificity, and probability. I'm especially confused about...

• Replies: 0
• Views: 1,266
11-20-2016, 12:55 AM
23. ### Conditional expectation

I have been given a expected value of conditional expression. I have to show that the expression is equal to the term on the right side. How do I get...

• Replies: 0
• Views: 1,612
11-19-2016, 12:01 PM
24. ### Parametric vs nonparametric tests

I'm pretty confused about the conditions in which I should use a parametric or a nonparametric test to compare the means of 2 (or more) populations...

• Replies: 7
• Views: 3,021
11-19-2016, 02:03 AM
25. ### Population specific odds ratio and subject specific odds ratio

Hey guys, For a school assignment I have to compute the population specific odds ratio and the subject specific odds ratio from the table below. ...

• Replies: 5
• Views: 1,572
11-17-2016, 12:21 PM
26. ### Sample Data Provided! Ranking Content Performance in Email Sends

Hello! I have searched the forum, but my question is so specific and I know so little I cannot identify threads that would answer my question. ...

• Replies: 1
• Views: 1,249
11-16-2016, 11:44 PM
27. ### Which SD to use for calculating minimal detectable change values?

I am hoping for some assistance with understanding the correct SD to use for the calculation of minimal detectable change scores. I have the...

• Replies: 0
• Views: 1,724
11-15-2016, 07:53 PM
28. ### Categorical Data Analysis: log linear analysis

Hey guys, I'm very new to statistics so I have a question: Consider gender (G), neuroticism (N), openness (O), major depression (MDD), and...

• Replies: 0
• Views: 1,663
11-15-2016, 07:22 AM
29. ### Dice problem help

I'm trying to get this problem set up correctly but I seem to have an issue as my calculated standard deviation seems to be off. Anyone have any...

• Replies: 7
• Views: 2,133
11-14-2016, 02:51 PM
30. ### [STATA - gsem] Multilevel Structural Equation Model - Meta Analysis

Hello, I am quite familiar with mixed effects (multilevel models) in meta analyses. Now, I want to do a mixed effects (multilevel) meta...

• Replies: 1
• Views: 1,394
11-13-2016, 05:07 PM
31. ### Which analysis for a survey question asking how frequently a group do an activity ?

I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

• Replies: 0
• Views: 1,313
11-13-2016, 12:43 PM
32. ### Am I choosing the right test?

My daughter is doing a science fair project testing the efficacy of insect repellants. She has 3 trials each for 3 repellants and 1 control. In...

• Replies: 1
• Views: 1,657
11-11-2016, 11:03 PM
33. ### Rejecting or not rejecting the null hypothesis.

A city council is considering drafting legislation related to the exclusion of renters with children. Since implementation will be expensive, they...

• Replies: 1
• Views: 4,601
11-11-2016, 01:22 PM
34. ### Sufficiency - Help solve a very basic problem

Hello everyone, I have just started a course in statistical inference a t the university. I have a very basic problem which I'm struggling to...

• Replies: 0
• Views: 1,242
11-10-2016, 05:18 PM
35. ### Finding the p value

I am taking a statistics class, and i have some problems Understanding a formula. The formula in question is like this: ...

• Replies: 12
• Views: 2,007
11-10-2016, 12:30 PM
36. ### Most appropriate analysis for my experiment

Hi all, I'm a newbie to biostatistics and I'm trying to figure out how to set the statistical part of my final project. I'm a dentistry student and...

• Replies: 0
• Views: 937
11-08-2016, 06:23 AM
37. ### Limited multiple response data - analysis and sample size calculation

Hello all, I am a relative novice at statistics and have run into a problem working out how to analyse some data I will hopefully soon be...

• Replies: 2
• Views: 1,220
11-07-2016, 03:15 PM
38. ### Standard Deviations in Normal Distributions

I have a homework question that is as follows. In a normal distribution, how many standard deviations above the mean is Q3? I know that Q3 is...

• Replies: 0
• Views: 2,261
11-06-2016, 02:06 PM
39. ### [Conjoint Analysis] Measuring (cognitive) cost functions instead of value functions?

Hello :wave:, usually one uses Conjoint Analysis, like in my case ACBC (Adaptive Choice Based Conjoint) in order to measure preferences and...

• Replies: 0
• Views: 1,614
11-06-2016, 04:58 AM
40. ### Normal Probability Plot

3 questions 1) A perfect Normal distribution displays as a straight line of data points. Right or left skewed display skewness of course. I have a...

• Replies: 2
• Views: 1,628
11-05-2016, 06:49 AM
41. ### E maximal error

To use e maximal error must one have np > 5 and nq > 5

• Replies: 2
• Views: 782
11-04-2016, 10:57 PM
42. ### Definition of small sample

Is it less than thirty

• Replies: 1
• Views: 1,469
11-04-2016, 04:00 PM
43. ### Indepedent or paired t-test?

If you are comparing the number of barnacles (% cover) on two different sides of rock which test would you take?

• Replies: 5
• Views: 1,782
11-03-2016, 03:05 PM
44. ### How to choose a method for monitoring delayed statistics in a market?

Hi there. First time poster, and Statistical newbie. I am trying to wrap my head around an idea for monitoring monthly real estate data. Here is...

• Replies: 0
• Views: 1,022
11-03-2016, 06:46 AM
45. ### Comparing time lag between two data sets

Hi, I am trying to compare two data sets available for x number of historical months. These are two different types of claims, i.e. first party...

• Replies: 0
• Views: 1,806
11-02-2016, 06:06 PM
46. ### single sample or multiple samples?

Let's say I run an experiment where I want to measure reaction times to some stimuli. The experiment consists of 100 trials. I collect data from...

• Replies: 7
• Views: 1,539
11-01-2016, 11:35 AM
47. ### Sources about setting up a retrospective cohort study

Hello, I'm writing a master paper in biomedical sciences that involves doing a retrospective cohort study on a database of soft tissue tumor...

• Replies: 0
• Views: 806
11-01-2016, 09:58 AM
48. ### Marketing Data Analysis

Looking for some insights if possible from fellow posters. Recently encountered this assignment and I am having trouble diving into it. It seems...

• Replies: 0
• Views: 1,303
11-01-2016, 09:53 AM
49. ### comparing coefficient of variation for multiple samples

I have three sets of data sets each 10 to 20 data points. I want to test if the coefficient of variation is the same across all the sets. Please...

• Replies: 0
• Views: 1,254
10-31-2016, 07:25 PM
50. ### Which of multiple variables is most significant for a set outcome?

Hello, I'm working on a project where there is a set outcome (a person undergoes a certain medical test), and I have several independent variables...

• Replies: 1
• Views: 1,613
10-30-2016, 07:55 PM
51. ### How to compare increase in price from different samples?

I have data samples of home sales of N different cities, and I want to find the city with the biggest increase in average prices between 2012 and...

• Replies: 3
• Views: 1,307
10-30-2016, 06:10 PM
52. ### Probability question

You rolRemoved Removed RemovedRemivedRemovedRemoved

• Replies: 5
• Views: 2,155
10-30-2016, 09:50 AM

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