1. Announcement:
05-10-2017
Views:
1,895
Page 58 of 294 First ... 8 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 108 158 ... Last
Threads 3421 to 3480 of 17593

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: 197,097
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: 66,925
09-30-2005, 09:44 AM
1. How to compare total weighted average change in average price of many items?

Hi, I need to compare the average change in prices from 2013 to 2014 for a list of 3000 different products. Below in each spoiler there is...

• Replies: 2
• Views: 1,433
07-17-2014, 09:06 AM
2. Interrater Reliability estimate (pearson's r)

Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

• Replies: 1
• Views: 7,275
07-16-2014, 08:11 PM
3. What are the advantages of the mean squared error versus the mean absolute error?

I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

• Replies: 2
• Views: 9,870
07-16-2014, 10:26 AM
4. Minimal significant difference between two scores

Hi, I'm presently working on the methodology of a psychological experiment, and I'm having trouble to decide of the best way to choose the...

• Replies: 0
• Views: 1,386
07-16-2014, 09:02 AM
5. Change scores: t-test or mann-whitney U test ?

Hi there Nice forum btw. Question: I have change-scores on pain in 37 patients pre/post intervention. which test do you use? t-test or...

• Replies: 1
• Views: 1,694
07-16-2014, 06:38 AM
6. Type of a variable

Good morning dears, Please, I have a question. I am using a variable, which is "Time spent in using a site" which is measured on categories:...

• Replies: 0
• Views: 1,216
07-16-2014, 04:07 AM
7. Sample size for superiority trial

Hey statistigeniuses, I would greatly appreciate some advice regarding a trial I am designing. I want to determine the most comfortable among 4...

• Replies: 0
• Views: 1,312
07-15-2014, 10:15 PM
8. how to test (same shape distribution) assumption of Mann Whitney test

Hello, I want to know how to test ( the same shape distribution) assumption of Mann Whitney test using spss I tried to confirm this assumption by...

• Replies: 1
• Views: 1,315
07-15-2014, 09:02 PM
9. Time series analysis

I have no experience with time series analysis, but have a dataset that needs attention. I have three years worth of population size estimates at...

• Replies: 5
• Views: 2,100
07-15-2014, 06:07 PM
10. mid interval values

Hi, i'm having trouble finding the correct mean (2.38) and standard deviation(1.54). I think i'm using the incorrect mid interval values. (i used:1 ,...

• Replies: 0
• Views: 2,010
07-15-2014, 04:09 PM
11. Clarification on Error Propagation

I thought I understood the basic operations for error propagation (addition, multiplication, etc), but I have a few questions: 1. Is variance the...

• Replies: 0
• Views: 836
07-15-2014, 03:32 PM
12. Adjust Wald Test for Type 1 Error

Hello All, I am running regression models with a polytomous dummy variable predictor (3 category) in Mplus. I am able to use Wald tests of...

• Replies: 0
• Views: 728
07-15-2014, 12:00 PM
13. KS test, non normality

We want to compare two continuous variables in R that are not normally distributed. As you can see, both variables contain a lot of zeros, whenever...

• Replies: 4
• Views: 2,066
07-15-2014, 10:24 AM
14. KS Test - help with ties in R

We are trying to compare two samples that are not normally distributed. We're trying to use the KS test in R, but we get a warning saying that an...

• Replies: 1
• Views: 1,252
07-15-2014, 09:02 AM
15. Datamining - Filters that Correspond to Highest Outcome Variable

I'm beginning a data analytics project and am curious what the best approach is to handle the following scenario: 1 outcome variable vOutcome...

• Replies: 2
• Views: 1,096
07-15-2014, 08:27 AM
16. what test / program do I use?????

Hi all, This is my first time posting. Im stuck and trying to have someone point me in the right direction. I have a data set from with 9...

• Replies: 3
• Views: 1,727
07-15-2014, 08:04 AM
17. can you compare bland altman plots?

Hi I want to compare 2 different measurements of the same thing using different devices/methods and have used a bland altman plot to decide if my...

• Replies: 3
• Views: 1,570
07-15-2014, 06:44 AM
18. Statistical Test for "Ranked" Data

I'm hoping someone can give me some advice. I have a data set from a survey in which respondents ranked a set of four options. The data looks...

• Replies: 1
• Views: 1,414
07-15-2014, 12:00 AM
19. Factor Analysis / PCA with longitudinal data

Hello, I have a problem which I'm trying to get around... I am trying to conduct a principal component analysis which compares changes in labour...

• Replies: 0
• Views: 2,673
07-14-2014, 04:59 PM
20. McNemars Chi squared Test Results

Hi All, Hope this is the right place. I am QC ing some work of my senior and I am getting some drastically different P values for McNemar's...

• Replies: 2
• Views: 1,734
07-14-2014, 03:51 PM
21. When I can combine data from two different measurement methods

Hello I was measure antioxidant capacity with two different methods (ABTS and Chemiluminescence method). Each sample (extract) I was measure twice...

• Replies: 0
• Views: 1,157
Now
07-14-2014, 02:05 PM
22. Multiple regression: must I keep IV that are not correlated to the DV

Hi everybody :) I have one variable divided in two subscales (so two IV). Only one of them is correlated (<0.3) to the DV. So, in the multiple...

• Replies: 1
• Views: 879
07-14-2014, 10:30 AM
23. Any tool/package for model validation in Logistic Regression?

Hello! This question is related to an earlier thread of mine about logistic regression modelling. I would like to know if anyone knows any...

• Replies: 0
• Views: 1,302
07-14-2014, 01:29 AM
24. almost sure convergence vs. convergence in probability, practical difference?

Hello I know the theoretical difference between these two types of convergence. Are the difference important in practice? If you are going to...

• Replies: 2
• Views: 1,614
07-13-2014, 04:43 PM
25. Correlation help

I have a report on correlation due soon and am looking for help as Math is not my forte. I am attempting to find the correlation between Marathon...

• Replies: 12
• Views: 2,588
07-12-2014, 09:50 PM
26. Help! t-test hypothesis

Hi, Please help me q)The data below are the random sample of 10 banks chosen randomly. The data shows average earning per share in year 2001 and...

• Replies: 1
• Views: 2,643
07-12-2014, 06:39 PM
27. Proving R squared as explained to total variance

How do you show that the square of the correlation coeeficient is the ratio of explaiend to total variance?

• Replies: 1
• Views: 1,398
07-12-2014, 03:25 PM
28. Help with t-test and multiple variables

Hello We are working with a large set of data from pigs at slaughter in R. We have info on the gender of pigs and of the occurrence of specific...

• Replies: 2
• Views: 1,525
07-11-2014, 03:04 PM
29. Use of letters to show difference between 2 groups of means ?

Hello, I hope everyone is doing well ! So, I want to ask you a question about mean comparison from statistics perspective ! well ! I have a...

• Replies: 7
• Views: 1,424
07-11-2014, 07:58 AM
30. Large samples from non normal population

Hello, I have two questions I am trying to do since yesterday. For some reason I just don't get them. I tried calculating but my answers are very...

• Replies: 0
• Views: 2,565
07-10-2014, 06:07 AM
31. Cross-Lagged-Correlation with nominally scaled data

Dear all, I am doing a small agenda study for my thesis. My research question is: Does the financial reporting of Outlet A at Time1 influence the...

• Replies: 0
• Views: 1,311
07-10-2014, 05:33 AM
32. How to compare groups with multiple categorical variables

Hi: I need to compare to compare two groups with multiple categorical variables_ I cannot quite figure out how to do it in one analysis: i am...

• Replies: 0
• Views: 1,884
07-09-2014, 11:03 PM
33. Find xbar - Hypothesis Testing

I have a question I'm stuck on: You are given the following hypotheses: Ho: m = 34, Ha: m > 34 sd = 10 n = 65 What would the sample mean...

• Replies: 1
• Views: 2,314
07-09-2014, 09:58 PM
34. Life table help

We are provided with the values for Qx (age specific mortality rate for a species/year) and mx (offspring produced per female/yr) and then shown a...

• Replies: 0
• Views: 1,530
07-09-2014, 05:55 PM
35. Test of equal variance

when to perform test for equal variance, is it necessary to perform "Test of equal variance" before performing One Way AVAONA

• Replies: 3
• Views: 1,686
07-09-2014, 01:35 PM
36. Two Sample t test for Unequal Sample Sizes

Which Two sample t test should be used when my sample size is small say < 20 and sample size is also different n1 = 15, n2 = 5

• Replies: 1
• Views: 1,858
MBJ
07-09-2014, 02:35 AM
37. Parameters estimation.

It is known that a sample consisting of the values 12, 11.2, 13.5, 12.3, 13.8 and 11.9 comes from a population with density functionf (x, α, β) = (...

• Replies: 1
• Views: 1,698
07-08-2014, 12:47 PM
38. Monte Carlo simulation for interviewing data?

Hello everyone, I have interviewing data that includes interviewers' ratings of applicants and job performance ratings. I would like to test how...

• Replies: 0
• Views: 1,128
07-08-2014, 11:29 AM
39. Friedman ANOVA significant but post hoc tests not

Hi, Would be very grateful if anyone could shed some light onto my stats. I have 3 different methods which i am testing on the same 4 users. My...

• Replies: 0
• Views: 2,484
07-08-2014, 05:57 AM
40. Analysing repeated Chi.squares

Hi, I'm testing whether a certain species of insect prefers a high or low concentration of a certain substance. I've trapped a few hundred using...

• Replies: 0
• Views: 1,012
07-08-2014, 05:38 AM
41. Survival analysis

Hi all, I have a question regarding survival analysis. As part of my research paper, I need to show the relationship between two numerical...

• Replies: 2
• Views: 1,096
07-08-2014, 03:12 AM
42. Maximum likelihood estimator in linear model

Consider two simple linear models. y_{1j}=\alpha _1+\beta_{1}x_{1j}+\epsilon_{1j} and y_{2j}=\alpha _2+\beta_{2}x_{2j}+\epsilon_{2j} ,...

• Replies: 3
• Views: 1,958
BGM
07-08-2014, 02:42 AM
43. Finding a UMVUE for variance of normal distribution

Let Let X_1,X_2,...,X_n be a random sample from a normal distribution with mean \mu and variance \sigma^2 . I showed that (\bar X,S^2) is...

• Replies: 1
• Views: 6,953
BGM
07-08-2014, 02:33 AM
44. Correction factor for retransforming data from a mixed effect model

Hi, I have read that if you use regression analysis for predictive modelling there is a bias when transforming logarithmic data back to its...

• Replies: 0
• Views: 1,226
LUM
07-08-2014, 01:13 AM
45. principal component analysis - right choice & interpretation

Hi everyone, I'm kinda stuck with a problem. I am building a scoring model with 14 different factors. Here my first question: as it's not a...

• Replies: 0
• Views: 1,709
07-07-2014, 06:01 PM
46. simple or multiple regression. Help PLEASE :)

Hello everybody, Hope you could help me in this matter... I have four independant variables mesured using a likert scale: Knowing-why,...

• Replies: 2
• Views: 1,834
07-07-2014, 02:38 PM
47. Correllation between variables (categorical and non-categorical)?

Dear all, I have a rather basic question that I hope some of you know the answer to. I have got two variables that we investigated using linear...

• Replies: 3
• Views: 1,181
07-07-2014, 09:39 AM
48. Continuous vs Discrete variables: Special case of lead time

Hi all, Firstly a warning that I may come off as a total noob. So please bear with me. :D Lead Time is the time between placing an order and...

• Replies: 0
• Views: 1,182
07-07-2014, 04:50 AM
49. Need Help: T - Test Hypothesis testing

Hi, Am I correct: q)A survey claims that there is difference in the income of people between the city A and city B. To test the claim people...

• Replies: 0
• Views: 1,565
07-05-2014, 02:07 PM
50. Need help to solve Hypothesis test questions!!

Hi, Please tell me if my procedure/concept involved in solving these questions is correct or not q1)A cold beverage company is concerned about...

• Replies: 0
• Views: 3,796
07-05-2014, 01:36 PM
51. Non probability quota sampling help for my dissertation please! :)

Here is the situation: ​ I am doing a survey to collect opinion of existing customers of a brand. Hence i am using their database. My research is...

• Replies: 0
• Views: 1,334
07-03-2014, 04:32 AM
52. Mann-Whitney U Test: Ordinal data with few categories

Hello, I am trying to use the Mann-Whitney U Test to compare ordinal data between 2 groups, but the problem is that there are only 3 categories...

• Replies: 12
• Views: 3,837
07-02-2014, 10:03 PM
53. Given A Confidence Interval And Sample Size, How do I Calculate Mean And SD?

Given: 9 women yielded a 90% confidence interval of 1,077 units to 1,123 units. How do I calculate the mean and standard deviation from this...

• Replies: 2
• Views: 2,885
07-02-2014, 03:06 PM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.