1. Announcement:
05-10-2017
Views:
1,934
Page 25 of 294 First ... 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 75 125 ... Last
Threads 1441 to 1500 of 17595

# 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: 197,211
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: 66,986
09-30-2005, 09:44 AM
1. ### What is the population parameter of interest? When the responses are normal?

The problems said: Students in Stanford are supposed to spend on average 3 hours of time per week for every credit hour they take. Last year, 263...

• Replies: 1
• Views: 2,966
02-06-2016, 01:55 AM
2. ### Significance between two populations

Hello, I'm sure the answer to this is obvious but I've hit a wall. I'm trying to determine if there's a statistical difference in bird...

• Replies: 3
• Views: 1,207
02-05-2016, 10:51 AM
3. ### Convert access data base to spss

I have a access database of Diabetes project. So in one sheet of Access is all clinical details of first visit and in sheet 2 there are details of...

• Replies: 1
• Views: 1,341
02-04-2016, 05:01 PM
4. ### Best way to calculate couple frequency

Hi all, Francesco's writing from Italy. I cannot solve this problem that seems quite easy: I've got a list of tests that are made of x colors....

• Replies: 0
• Views: 701
02-04-2016, 10:52 AM
5. ### Response time - what is the best central tendency measure?

I have a bunch of people working under me. I give them some tasks to complete on a regular basis. Some of the tasks are time bound and some aren't. ...

• Replies: 3
• Views: 1,812
02-03-2016, 11:22 AM
6. ### Intro Stats Problem.

A student takes a true or false test with 15 questions. He guesses on every question. 1) Find the probability that he gets atleast 1 question...

• Replies: 7
• Views: 2,068
02-02-2016, 08:15 PM
7. ### Any Suggestions A Good Discussion Topic For An Online Intro Statistics Course

I'm teaching an online Intro Statistics Course for the first time. This week my Discussion Forum Topic is "How will Statistics be important in the...

• Replies: 0
• Views: 1,545
02-02-2016, 05:36 PM
8. ### Repeated Measures - Maximum number of variables

I know that the general rule of thumb is that you need 10 observations or 10 cases per variable in your model. How about in a repeated measures...

• Replies: 3
• Views: 1,744
02-01-2016, 02:28 PM
9. ### proc reg vs. proc genmod

How do you decide which one to use? I noticed genmod didn't give me an R^2.:confused: You can't give a class statement with proc reg but if you...

• Replies: 7
• Views: 12,265
02-01-2016, 01:08 PM
10. ### Percentage of agreements

Hi guys! So I'm working on my thesis and my supervisor told me to check per person, the percentage of agreements (so I can single out single...

• Replies: 0
• Views: 1,110
02-01-2016, 10:53 AM
11. ### Student Dissertation - Data analysis - Which method should I choose?

Hello Everyone, My research consists of quantitative questionnaires to the age group (18-24) aiming to reflect on Physical Education in the UK and...

• Replies: 0
• Views: 573
02-01-2016, 10:08 AM
12. ### White ^ Black balls

Hi guy's, I tryed to figure out couple of weeks how to solve a statistic problem with white and black balls.I kindly ask you if you can help me a...

• Replies: 5
• Views: 2,148
01-31-2016, 03:44 PM
13. ### Screening of categorical variables

hi i am working on a data set which had 36 categorical variables mostly nominnal and 4 continuous variables . These are all predictor variables ....

• Replies: 1
• Views: 657
01-31-2016, 08:41 AM
14. ### average and SD for averge values with SD

Hi guys, Hope I could find my answer here, since I've been trying to figure it out for quite sometime... Lets say that I am measuring the...

• Replies: 1
• Views: 955
01-30-2016, 03:27 AM
15. ### ANOP / ANOMP: what if n_i * p_i < 5 for one i and n_i * p_avg >> 5 ?

I'm constructing ANOMP/ANOP graphs to follow-up inspectors in a steel factory. In literature (eg The analysis of Means, Peter R. Nelson) they...

• Replies: 0
• Views: 839
01-29-2016, 03:34 AM
16. ### Question about the Standard Error of the Mean

Hello all, I'm not an expert in statistics. Suppose i have an instrument that measures temperature with tolerance interval in a measurement ±5 °C....

• Replies: 1
• Views: 1,699
01-28-2016, 06:32 PM
17. ### Comparing Audit and Re-audit - can statistical analysis be performed?

Hi There I would be very grateful for all the advice I can get please. I performed a re-audit where I retrospectively examined the medical...

• Replies: 0
• Views: 972
01-28-2016, 02:12 PM
18. ### Calculating Variance Explained by Effect: High Intercept Sum of Squares Problem

Hi :) Context: I'm using G*Power to conduct a post hoc power analysis. The study design is a 2x2 Two-Way ANOVA. ANOVA was done in SPSS. ...

• Replies: 0
• Views: 1,382
01-28-2016, 12:21 PM
19. ### Categorical data in SEM using AMOS. How can results be interpreted?

I'm very new in SEM and I'm concerned about the reliability of Bayesian estimation of categorical variable in AMOS; then, if it is reliable, how can...

• Replies: 0
• Views: 913
01-28-2016, 09:02 AM
20. ### Statistics without individual subjects

Hi all My situation is that I'm going to run an experiment on food behavior. I have a canteen with a buffet available and I'm going to do a...

• Replies: 0
• Views: 1,031
01-28-2016, 05:43 AM
21. ### classification of statistical analysis types

Hi! I'm writing literature review article in which I describe several reaserches including types of statistical analysis used by authors. As I'm not...

• Replies: 2
• Views: 3,371
01-27-2016, 08:28 PM
22. ### Project Idea - Intro Statistics Class

I'm a freshman in college now and I'm taking an intro statistics course. We have a final project for this class, and we need to decide on our own...

• Replies: 1
• Views: 3,570
01-27-2016, 05:08 PM
23. ### Mixed Repeated Measures and Independent Measures One-Way ANOVA [SPSS]

Hello, I am trying to determine the best way to carry out my one-way ANOVA in SPSS. I have three groups: Pre-Surgery, Post-Surgery, and...

• Replies: 0
• Views: 1,203
01-27-2016, 04:56 PM
24. ### [Excel/SPSS] - How to compare group homogeneity (2 variables)

Hey dear forum members, it's my first time here, so a big hello to everyone reading this. First of all, I hope my headline gave you a clear idea...

• Replies: 5
• Views: 1,264
01-27-2016, 05:16 AM
25. ### TTEST vs Logistic Regression

I have seen some posts here with the same title but I believe my problem is different: I am unsure whether to conduct a 2 sample ttest or a...

• Replies: 1
• Views: 1,722
01-26-2016, 12:45 PM
26. ### formula for performing t test for linear regression mean response

Hi. I am going over my note for stat class and in the chapter for simple linear regression I encountered this: Hypothesis Tests for Mean Response at...

• Replies: 2
• Views: 1,515
01-26-2016, 08:42 AM
27. ### Combining two estimates to minimize MSE

I am struggling finding the formula for minimizing the Mean Squared Error by placing optimal weights on two estimates. When I place equal weights, I...

• Replies: 1
• Views: 1,260
01-26-2016, 04:53 AM
28. ### Interpreting coefficients in pooled cross-sectional data with cluster-dummies

Data: pooled cross-sectional data. 6 countries. 3 years of cross sectional data (10 year gaps in between), with different samples of individuals in...

• Replies: 0
• Views: 1,024
01-25-2016, 10:14 PM
29. ### CI for a known median survival time without individual subjects data

Hi All, I need to calculate the 95% CI for a median overall survival of 10 months out of 30 patients, assuming an exponential distribution. No...

• Replies: 4
• Views: 1,153
01-25-2016, 01:06 PM
30. ### Formally reporting parameter estimates of a covariate (age) of an ANCOVA

The research questions for my dataset are whether there is an initial visual processing deficit in developmental coordination disorder? And if so...

• Replies: 1
• Views: 1,249
01-25-2016, 08:48 AM
31. ### compute mean square error from summary statistics

Hi, I have a 2 by 3 repeated measures design, but only the mean, standard deviation and sample size for each cell in the design. I can compute the...

• Replies: 4
• Views: 1,478
01-25-2016, 08:44 AM
32. ### Confidence interval of a mean difference

Hi all, can someone refresh me on the process to do the following. Based on data that was published in a thesis: A within subjects...

• Replies: 2
• Views: 1,118
01-23-2016, 02:38 PM
33. ### Time series[comparison over time]Thesis defense questions. Need your opinions please

Hi, I`am going to be defending my thesis in two weeks. My thesis is basically about Information technology usage per individuals in my country. I...

• Replies: 1
• Views: 1,387
01-22-2016, 06:01 PM
34. ### impose internal coherence (positive definite) on a matrix

how do I turn a matrix which bears the resemblance of a variance covariance matrix into a "positive definite" matrix (=a usable var cov matrix) ? ...

• Replies: 2
• Views: 1,244
01-22-2016, 02:52 PM
35. ### Comparing 2 groups of categorical data - chi, fishers exact or something else?

Hi There I would be very grateful for all the advice I can get please. QUESTION 1 I retrospectively examined the medical notes for 55 patients...

• Replies: 2
• Views: 943
01-22-2016, 07:05 AM
36. ### Dataset for college project

I am a college math teacher and I was assigned to teach a statistics course. I must create a project for my students in which they will have to...

• Replies: 1
• Views: 940
01-21-2016, 06:19 PM
37. ### which test for a 2-way repeated measures design with multivariate data in Matlab or R

Hello, I have one of the annoying 'which test'? questions. I have trivariate metric data (x1,x2,x3) from a repeated measures design with 2...

• Replies: 2
• Views: 1,686
01-21-2016, 11:58 AM
38. ### moderated regression analysis: help would be awesome.

What I know: -1 IV standardized ''rating/score scale''(? ) variabel -1 Iv coded (1/-1) dichtomous -1 Dep. rating scale mean -something called a...

• Replies: 1
• Views: 1,328
01-21-2016, 08:49 AM
39. ### Chi Square 1x2 degrees of freedom?

Good Morning, I have what I hope is a simple question. If I am running a chi square test 1x2 -- I cannot use 0 degrees of freedom when...

• Replies: 2
• Views: 1,805
01-21-2016, 08:47 AM
40. ### Standard Deviation bessel correction

Hello friends. I can't seem to find the last piece in my puzzle. If you take a look at my general script here: I'm having all the right...

• Replies: 1
• Views: 2,312
01-20-2016, 07:39 PM
41. ### need urgent help :/

Dear All, just had a question from my teacher and don't know how to begin. What are the most productive branches of economies around the world...

• Replies: 3
• Views: 1,651
01-20-2016, 07:02 PM
42. ### Are two sources of variation ever completely independent?

Pick three values to represent the true value, and two error sources and put them as the header in separate columns. Remember to include a positive...

• Replies: 1
• Views: 1,203
01-20-2016, 03:54 PM
43. ### When should a time series model be used

Consider the following scenario: i have a set of responses y(t),y(t-1),.....y(1), where Y's are continuous and fall between , and "t" is the...

• Replies: 1
• Views: 1,205
01-20-2016, 07:13 AM
44. ### Non Significant ANOVA results - need to explain why.

I was given data to work on for a lab report. I did a 2 x 2 between subjects ANOVA (if it matters n=187). Main effect of IV1 was not significant....

• Replies: 4
• Views: 1,635
01-20-2016, 05:22 AM
45. ### Test to identify bias in staff recording data - some guidence please

Hi, First post on this forum. Have tried to search for the correct answer in this forum, but have not found it (perhaps I'm not searching correctly)...

• Replies: 0
• Views: 927
01-19-2016, 09:58 PM
46. ### Help Needed Quickly on Original but Simple Research

Hello everybody! I recently conducted research where I ran protein powders through a spectrophotometer which gave out concentration values to...

• Replies: 0
• Views: 1,067
01-19-2016, 06:09 PM
47. ### Estimation

There's school elections. A guy, asked 8 people and he realized that he had 25% support. Confidence level is 95%. So 25%+(or -) **,**. And **,**=? I...

• Replies: 2
• Views: 1,443
01-18-2016, 03:44 PM
48. ### Fisher's Exact Test 1x2 ( P1<>P2 ) Calculation

Good Morning, I am wanting to code to run a Fishers Exact Test on a 1x2 table where I specify the expected frequencies of each of my two...

• Replies: 0
• Views: 2,774
01-18-2016, 06:39 AM
49. ### Euclidean distance comparison weighted by correlation

Hello, I want to calculate the Euclidean distance between two objects across a set of n variables. For those n variables I have generated a...

• Replies: 0
• Views: 1,416
01-17-2016, 06:52 PM
50. ### Pearson or T?

Trying to finish my science fair, so after reading a number of the posts, this may be way beneath you, but if you're bored or need community service...

• Replies: 3
• Views: 1,499
01-17-2016, 05:21 PM
51. ### Multiple intervention groups for meta-analysis help

Hi everybody I'm conducting a meta-analysis, and some papers have 2 or 3 intervention groups in addition to the control. I read that I should...

• Replies: 2
• Views: 1,910
01-16-2016, 06:47 PM
52. ### Statistics for regional disease risk factors

Hi, I've data set collected from 700 sheep farms from 5 regions of England (north, south, East, West, Central). The aim is find out if climate...

• Replies: 2
• Views: 1,678
01-16-2016, 05:48 PM
53. ### changing frequency of data

Is it acceptable in PhD thesis to use data that have been converted from low frequency (annually data) to higher frequency (quarterly data). I'm...

• Replies: 7
• Views: 1,627
01-16-2016, 09:59 AM
54. ### How to calculate the mean of two log-likelihood values.

Hi All, I'm confused how to calculate the mean of two (natural) log-likelihood values. The software I'm using (MrBayes) does this for me...

• Replies: 3
• Views: 1,223
01-15-2016, 12:33 PM
55. ### Monte Carlo Simulation?

Sorry I want this deleted

• Replies: 0
• Views: 1,150
01-14-2016, 09:44 AM
56. ### 1 X 2 Chi Square? With controlled expected values?

Good Morning, I’m wondering if you could possibly help me with a little problem. I have some data: 1. Number and date of disease outbreak...

• Replies: 2
• Views: 1,717
01-14-2016, 09:34 AM

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.