1. Announcement:
05-10-2017
Views:
1,942
Page 17 of 294 First 1 2 3 4 5 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 67 117 ... Last
Threads 961 to 1020 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: 197,217
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: 66,990
09-30-2005, 09:44 AM
1. ### Mann Whitney u test- Interpretation help?

Hi I have conducted a Mann Whitney u test to test to see if there is a difference between one of my variables and gender. The test shows there is...

• Replies: 3
• Views: 8,226
09-10-2012, 02:45 AM
2. ### Sample Overlap - what is the effect on stat tests?

A survey was done. 1000 respondents. 250 were younger males. 250 were younger females. 250 were older males. 250 older were females. I want to...

• Replies: 3
• Views: 8,225
09-16-2011, 06:11 AM
3. ### How robust is an anova?

This is more of a theoretical question and probably a very easy one at that. We are having some disagreements in our group about how to analyze the...

• Replies: 3
• Views: 8,223
08-05-2010, 03:31 AM
4. ### Intra-class correlation for test-retest

I have done test retest relaibility of a 25 item, four point scale over a two week interval. I have analysed it with an intra-class correlation with...

• Replies: 2
• Views: 8,220
08-11-2008, 04:12 AM
5. ### Community Attitudes Towards Mentally Ill (Taylor & Dear,1981)

Was wondering if anyone could be assistance to me, i'm using this CAMI likert scale, its a 40 item questionnaire based on a 5 response likert scale -...

• Replies: 1
• Views: 8,215
08-04-2013, 11:33 AM
6. ### Not sure what test to use in SPSS?

i have 4 IVs (wealth, health, social connectedness and love) and 1 DV but theyre all in numberical format. Does anyone know how to measure...

• Replies: 11
• Views: 8,210
04-27-2009, 05:32 AM
7. ### comparing different sample sizes

I need to carry out an independent samples t-test, but the samples are of different sizes (12 & 14), do I need to carry out a non parametric...

• Replies: 2
• Views: 8,206
03-02-2009, 03:46 PM
8. ### Help with a pilot cohort study sample size estimation

Hi everyone, I am a new research student and I am struggling now. Please can anyone advise me on sample size required for my project? I am...

• Replies: 4
• Views: 8,198
09-02-2010, 06:18 PM
9. ### Explanatory Variable

Ok, here is the question. A swimsuit manufacturer wants to test the speed of its newly designed suit. They design an experiment by having 6...

• Replies: 1
• Views: 8,197
10-11-2010, 01:36 PM
10. ### width of 90% CI and 95% CI

Why is the width of the 90% CI different than that for the 95% confidence interval? My work: The width of the 90% CI differs than that of the 95%...

• Replies: 1
• Views: 8,180
03-17-2006, 06:11 PM
11. ### Help!! Need advice on calculating percentiles

Hi - Hoping I can get some opinions on the method we are using to calculate percentiles. I work with a small non-profit - I need to calculate...

• Replies: 2
• Views: 8,177
04-26-2007, 02:20 PM
12. ### Beta random variable to Normal random variable

I want to transform a Beta distributed random variable to a normaly distributed random variable. Is there any way of doing that? Formally, ...

• Replies: 3
• Views: 8,177
09-22-2009, 01:25 PM
13. ### t-test or mann-whitney

I have 2 sets of data. Hospital stay duration (days) for a particular illness. Hospital 1: 21, 10, 32, 60, 8, 44, 29, 5, 13, 26, 33 Hospital 2:...

• Replies: 12
• Views: 8,177
07-09-2012, 07:52 PM
14. ### box plots - stem & leaf

Hi, I was wondering when it comes to reporting results and you put in stem & leaf diagrams what it is exactly you report? I know some boxes have...

• Replies: 2
• Views: 8,175
03-02-2010, 12:56 PM
15. ### How to scale the Gamma distribution when its probability is more than 1?

Let us assume we have a gamma distribution with parameters alpha (or theta) = 1.33, beta (or k) = 0.0124 Some values of this gamma...

• Replies: 9
• Views: 8,173
01-01-2010, 10:33 PM
16. ### Maximum Likelihood Estimator for alpha in Gamma Distribution

I got the first part of the question asking for the MLE for Beta. But I realized that MLE for alpha cannot be mathematically derived. I know that we...

• Replies: 11
• Views: 8,169
02-10-2012, 02:17 AM
17. ### Mann-whitney U test: All values are tied values - Is that ok?

The following link provides great help for analysing agreement between two groups (say male & female) on a statement ranked on Likerts 5 point scale...

• Replies: 4
• Views: 8,163
05-11-2012, 10:31 AM
18. ### multiple proportions from one sample- sig testing

Greetings all, I have a question about analysing responses from a multiple choice question. A lot of what we do in our analysis is say which...

• Replies: 5
• Views: 8,160
01-09-2017, 10:49 AM
19. ### Question on Multinomial Logistic Regression

I developed a multinomial logistic model (using SPSS) with 5 independent variables and dependent variable has three categories. The model output...

• Replies: 5
• Views: 8,158
Fez
11-02-2007, 02:39 AM
20. ### class width/ lower/upper boundry?

Hey all, I understand how to do class width (range/number of classes) However, how would you do this? Suppose we chose 16 classes with a class...

• Replies: 1
• Views: 8,158
10-07-2009, 03:04 PM
21. ### ANOVA results and confidence intervals

Hallo can someone help me with this problem, please? I have done a univariate 2 factor ANOVA with spss. The problem is that the 95% confidence...

• Replies: 2
• Views: 8,157
09-11-2006, 08:53 PM
22. ### plz i need your help

hi everybody.. this z my 1st week in the stat course, am studing in Dubai. & i have some difficulties in answering these Qs: 4.51 A company...

• Replies: 2
• Views: 8,147
03-23-2009, 03:18 PM
23. ### Confidence intervals and significance level

Please help to solve this exercise: A sample of 250 items from lot A contains 10 defective items, and a sample of 300 items from lot B is found to...

• Replies: 4
• Views: 8,136
BGM
12-10-2011, 03:57 PM
24. ### How to predict future scores based on past scores.

Hi, First time poster. I would like to work out what a player's next score will be in fantasy football. Eg. LJ posts scores for the past 4...

• Replies: 6
• Views: 8,128
08-26-2009, 06:44 AM
25. ### Normal Distribution of Birth Problem

Hello everyone, I've encountered a question regarding the normal-distribution, on what is considered as usual or unusual. For every 100 births...

• Replies: 3
• Views: 8,111
10-30-2010, 02:07 PM
26. ### Did i get these right, T/F questions

T 2. The claim that "male and female students at Coastal Carolina University prefer different parking lots on campus" is an example of a chi-square...

• Replies: 2
• Views: 8,109
12-09-2008, 11:10 PM
27. ### Two-way ANOVA with or without replication?

The logistics department of a large firm employs three “estimators” whose job it is to decide the likely cost of delivering their products to their...

• Replies: 0
• Views: 8,101
04-29-2011, 02:02 PM
28. ### Aagh!! - % values - parametric or non parametric?

Hi good people I am a very confused PhD student, and despite my best efforts over the past 24 hours have been unable to get a definitive answer to...

• Replies: 1
• Views: 8,093
07-24-2008, 10:43 PM
29. ### non-central chi-square distribution

Dear All I do not have enough background in statistics. Can any one please tell me how to finde probabality for noncentrally chi-sqaure random...

• Replies: 3
• Views: 8,092
11-15-2007, 09:34 AM
30. ### Intercept in Regression

Hello, SHould we always include an intercept in regression analysis? What do we do if the intercept appears to be non significant? DO we take...

• Replies: 1
• Views: 8,089
01-09-2010, 03:29 PM
31. ### equation for critical values of q

Hello, I am looking for the equation(s) in how to calculate critical values of q. As you know q is used in doing Turkey's multiple comparison. I...

• Replies: 1
• Views: 8,089
10-24-2010, 07:52 PM
32. ### Outliers and 5% trimmed means vs true mean

Hi, I have a few categorical (likert scale) variables that each have 1 univariate outlier (z-score > 2.88 two tailed). I am considering recoding...

• Replies: 6
• Views: 8,085
02-26-2012, 09:39 PM
33. ### Pearson Critical Values

I am working on a project where I need to determine trends in maintenance conducted on large ships. I have man-day totals and the age of the ship...

• Replies: 4
• Views: 8,081
04-02-2010, 10:53 AM
34. ### How can I find out, if subscales are independent?

I need to find out, if four subscales of a scale a independent from each other in my sample. A correlation with all four is a good start, so I did...

• Replies: 26
• Views: 8,078
05-06-2015, 10:44 AM
35. ### Arima

Hi anyone knows how to calculate ARIMA using excel and also tell where i can find an example jay

• Replies: 1
• Views: 8,074
10-04-2009, 09:39 AM
36. ### Comparing Slopes Best Fit Lines Between 2 Groups

So lets say I have 2 data sets. Both sets contain various types of information about a person, including age as well as other factors relating to...

• Replies: 6
• Views: 8,068
Jac
07-09-2012, 11:41 AM
37. ### The importance of calculus and matrix/linear algebra in understanding statistics

Hey all, I'm currently in a stats class that teaches the course (right now with a focus on correlation and linear regression) in a very...

• Replies: 9
• Views: 8,066
02-08-2012, 12:03 AM
38. ### what is the purpose in plotting moving average??

• Replies: 1
• Views: 8,061
10-05-2006, 05:25 PM
39. ### Need to calculate percentile score

I need help from one of you guru's. I have 8 statements that i ask, that are to be rated from 1 to 5 each. so, the lowest score is 8 and the highest...

• Replies: 11
• Views: 8,059
03-04-2008, 04:39 PM
40. ### The Central Limit Theorem

Here is the question Weights of 15-year old males The mean weight of 15 year old males is 142 lbs, and the standard deviation is 12.3 lbs. If the...

• Replies: 2
• Views: 8,055
11-16-2009, 12:36 PM
41. ### Sample Size Calculation for Clinical Study with Three Treatment Groups

Hi, I was wondering if anyone knew a formula to calculate the sample size needed for a clinical study in which there are three groups (tx1, tx2,...

• Replies: 3
• Views: 8,048
09-21-2008, 01:35 PM
42. ### Help!

I have this problem and I am totally stuck. I know that I know how to do it, but I've just hit the proverbial wall. Any help would be greatly...

• Replies: 1
• Views: 8,041
09-25-2009, 03:23 AM
43. ### What's between ANOVA and linear model

Hi everybody, I'm new around here, so if i do some mistakes regarding the threads etc. not to mention the statisitcal terms, sorry : ) I have a...

• Replies: 11
• Views: 8,040
10-15-2008, 07:30 PM
44. ### Need help with chi-squared analysis of observed vs expected percentages

I'd appreciate any help possible with this as I am coming up against an abstract deadline and cannot get a hold of a statistician at my institution. ...

• Replies: 1
• Views: 8,040
11-30-2008, 09:35 PM
45. ### Analysis of Likert Scale data

Hi All, I am doing research on expertise and had respondents use 7 point likert scales to provide answers to practical questions. I'm going to...

• Replies: 0
• Views: 8,040
04-03-2011, 07:59 AM
46. ### Help

I'm having a little trouble with the following question: Four pairs of data yield r = 0.942 and the regression equation (predicated value of y...

• Replies: 6
• Views: 8,030
11-19-2005, 10:10 PM
47. ### Pre/Post Data

Hello. I have pre/post data that I would like advice on what would be the most appropriate data analysis method. I visited a group of clinics and...

• Replies: 1
• Views: 8,029
02-24-2006, 05:33 PM
48. ### Grade Cut offs using a Curve

I am currently taking my last math class for my degree and I'm on my last problem of our homework assignment. So far I have a 100%, but I'm...

• Replies: 2
• Views: 8,026
07-22-2010, 09:56 AM
49. ### one mean t test---the p value approach

I dont quite understand how to find the p value of other hypothesis tests including the one mean t test. Depending on the tails, are there...

• Replies: 2
• Views: 8,025
06-13-2008, 10:12 PM
50. ### Sample size for a pilot study

I am looking for advice on what size a sample should be for a pilot study. The purpose of the pilot is to test a questionnaire. The population it...

• Replies: 2
• Views: 8,025
05-27-2010, 11:14 AM
51. ### Repeated Measures for Ordinal and Dichotomous Data

Hi, I have a dataset with some ordinal variables (likert) and some dichotomous variables (yes/no). Variables were collected from subjects at 5...

• Replies: 1
• Views: 8,024
01-02-2009, 05:19 PM
52. ### Confidence Interval for Population Mean

I am working on a statistics problem and want to make sure I am on the right track. Here is the problem: The following sample of 16 measurements...

• Replies: 6
• Views: 8,022
11-13-2010, 11:51 AM
53. ### ANOVA post-hoc analysis in R

Hi everybody, I have already analyzed my dataset using two-way ANOVA in R. The result is that both variables have a significant influence, but no...

• Replies: 1
• Views: 8,019
08-18-2009, 07:59 AM
54. ### HELP! Question about frequency distribution

I can't figure out how to make a frequuency distribution "using 5 classes" that would allow me to see the shape of the distribution. I would really...

• Replies: 2
• Views: 8,017
09-09-2008, 06:32 AM
55. ### Comparing different units of measurement

Hiya, Im wondering if anyone has any views on how to compare change in variables that are measured in different units? I cant normalise the data...

• Replies: 2
• Views: 8,001
06-30-2008, 05:28 PM
56. ### How to compare the mean age between 2 groups?

Supposed that I have 2 groups of students. N=10 for each group. Group A ages: 12, 13, 12, 13, 14, 14, 15, 12, 11, 13 --> mean age: 12.9 Group B...

• Replies: 5
• Views: 7,988
04-19-2013, 07:37 AM
57. ### Correlations btw. Ordinal and Binary

Anyone know what test to run to find a correlation between a 6-point ordinal variable and a binary one? What about between two binary ones? Any...

• Replies: 4
• Views: 7,986
08-11-2008, 10:03 AM
58. ### How to calculate a 'pooled SEM' for an ANOVA?

I'm not quite sure I understand this conceptually. I have seen in a few biomedical articles now something referred to as a 'pooled SEM' from an...

• Replies: 2
• Views: 7,985
06-05-2009, 04:22 AM
59. ### Games-Howell tests in R

Hiya, I have a set of data with one IV (3 levels) and 1 DV which fail a Bartlett's test for homogeneity of variance and the data cannot be...

• Replies: 1
• Views: 7,973
06-19-2012, 11:03 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.