1. Announcement:
05-10-2017
Views:
1,830
Page 51 of 294 First ... 32 33 34 35 36 37 38 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 70 101 151 ... Last
Threads 3001 to 3060 of 17584

# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,716
09-30-2005, 09:44 AM
2. ### 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: 196,691
07-16-2014, 11:01 AM
1. ### Zero Inflated Model(s)

Hello all, I'm working on a paper on the spatiotemporal distributions and abundances of rock pool fish. Over a couple of years, every month, the...

• Replies: 2
• Views: 1,374
12-03-2015, 04:54 AM
2. ### What technique to use?

I am studying modeling, and I am looking for a good technique to optimize an insurance process, but I am not quite sure how to accomplish what I want...

• Replies: 4
• Views: 1,573
06-14-2014, 07:35 AM
3. ### Similar to a Pearson Chi-Square Test

Hi All, I'm working with a 4x3 Contingency Table and would like to do a test similar to a Chi-Square Test. I figured it might be called a Weight...

• Replies: 8
• Views: 3,706
08-18-2010, 09:56 AM
4. ### Brewer's Method

Problem solved...

• Replies: 0
• Views: 2,558
11-26-2010, 07:07 PM
5. ### Creating a score out of a "select all that apply" question

Dear Omniscienti, I asked the following question as my dependent variable: Which, if any, of the following actions has your household taken to...

• Replies: 4
• Views: 1,382
03-17-2013, 09:20 PM
6. ### parametric vs non-parametric 4 beginners

Hi. Hopefully simple analysis that I've been staring at for so long I've forgotten the basics. Masters research in medicine. 28 patients, each...

• Replies: 1
• Views: 2,953
06-24-2006, 10:53 PM
7. ### Levene's Test in ANOVA using SPSS... BLANK BOX??

Hey, Im running an 2 way ANOVA in SPSS using age, university and gender over selling prices, working fine with one of my conditions, but my second...

• Replies: 0
• Views: 2,891
08-21-2012, 11:35 AM
8. ### Robust Tests of Equality of Means SPSS HELP ANOVA

Hi guys, Im trying to run a one way ANOVA in SPSS using age as independent variable and selling price as dependent, ive selected Welchs and...

• Replies: 0
• Views: 6,672
08-20-2012, 02:11 PM
9. ### Testing for moderated mediation

Hi everyone, I am using the Baron and Kenny approach to test for mediation. I would like to test for a moderation effect in path B. I know...

• Replies: 2
• Views: 1,311
04-18-2015, 09:56 AM
10. ### Statistics project: hypothesis testing

For the most part i understand the concept but i am not sure what kind of test to use as my teacher only shows us how to do things in the calculator...

• Replies: 11
• Views: 7,006
07-13-2009, 06:54 PM
11. ### Upper thresholds for response times ??

Hi! I've been asked to determine the lower and upper thresholds for our response times for the fire department for which I work. I watched this...

• Replies: 0
• Views: 744
05-01-2017, 11:38 AM
12. ### CFA with AMOS

My teacher told me to run a single CFA, with the score of a unidimensional questionnaire, and to see if it is better to make a two factors models...

• Replies: 0
• Views: 722
Cla
12-11-2013, 08:49 AM
13. ### Are weighted means appropriate?

Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

• Replies: 4
• Views: 2,754
04-12-2006, 08:42 AM
14. ### how to test for Gaussian distribution

Hey, I'm a bit rusty on my stats and i'm coming back to an article i wrote 18 months ago. I think i tested for Gaussian distribution, but now i...

• Replies: 0
• Views: 3,096
04-25-2007, 03:37 PM
15. ### Sample size query

I have been asked to devise an experiment related to cells in a solution. A sample of cells will be provided and I must test whether or not there is...

• Replies: 3
• Views: 2,453
07-27-2007, 07:58 PM

Dear All I am going nuts trying to work this out.... I'm a Psych. grad student trying to check to see what sample size I would need in the...

• Replies: 1
• Views: 12,013
02-07-2007, 04:57 PM
17. ### Kruskal Wallis Test - Minimum Group Size?

I have 23 subjects, and I want to make comparisons of the distribution of a measurement (with non-normal distribution) across several categories. In...

• Replies: 2
• Views: 8,623
08-06-2012, 08:20 PM
18. ### Type I or II Error?

If I'm making inter-group comparisons and find significant results for differences, but some of my subgoups are particularly small (n<5), is it a...

• Replies: 3
• Views: 1,329
08-11-2012, 03:52 PM
19. ### Simple effects in repeated-measures analyisis WITH one COVARIATE

Hi there, I am really stuck with an analysis: - one repeated (within-subject) factor (two levels): variables t1 and t2 two between-subject...

• Replies: 0
• Views: 3,473
01-20-2010, 10:47 AM
20. ### Comparing two sets of data of different sizes - Chi-square test?

Hi. I'm writing a proposal for a research project that is looking at the types of words people would like to target in therapy after a stroke. ...

• Replies: 0
• Views: 1,884
04-26-2014, 06:22 AM
21. ### University help, please! Don't know what tests to use! Only 4 needed.

Hi guys, I'm studying an equine degree, and have had to do a statistics module. Coming from an agricultural background, I have no drive for...

• Replies: 1
• Views: 1,371
11-28-2012, 10:49 AM
22. ### Adjusting means for different sample sizes

Hello, I have calculated the mean score for several variables. Because there is a big difference in the number of respondents for each variable it...

• Replies: 3
• Views: 1,670
08-11-2014, 03:49 PM
23. ### Writing null hypothesis and deciding on rejection criteria

The number of faults in one metre of a thread is Poisson distributed.It is claimed that the average number of faults is 0.02 per metre.A random...

• Replies: 0
• Views: 1,814
10-28-2013, 10:46 AM
24. ### Hypothesis testing in poisson distribution

At a nuclear plant great care is taken to measure the employees health.These are the number of visits made by each of the 10 employees to the doctor...

• Replies: 5
• Views: 4,153
10-28-2013, 10:25 PM
25. ### Goodness of fit test for a normal ditribution

In the example from a site I was trying out http://www.cimt.plymouth.ac.uk/projects/mepres/alevel/fstats_ch5.pdf this problem in page 107 about...

• Replies: 0
• Views: 1,080
12-07-2013, 04:04 AM
26. ### Using estimators for goodness of fit test

This is a practice question I came across when dong some goodness of fit test examples.A company sells cloths by mail order.The size of clothes is...

• Replies: 1
• Views: 1,198
01-06-2014, 07:12 AM
27. ### Obtaining sample variance from grouped data for goodness of fit test

This is a practice question I came across when dong some goodness of fit test examples.A company sells cloths by mail order.The size of clothes is...

• Replies: 0
• Views: 1,997
01-05-2014, 01:16 PM
28. ### 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: 1,917
BGM
07-08-2014, 02:42 AM
29. ### 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: 6,885
BGM
07-08-2014, 02:33 AM
30. ### Changing process average in control charts

Data is given for a X bar and R chart of subgroup size=4. . The control limits are for X bar chart: center line=178.46...

• Replies: 0
• Views: 1,674
12-16-2014, 12:36 PM
31. ### Changing a target value that minimize the product being outside the specifications in

I was doing problems in the article here. http://elearning.vtu.ac.in/10/enotes/06IPIM65/Mod10-NVN.pdf In the question on page 16

• Replies: 0
• Views: 1,531
12-17-2014, 06:52 AM
32. ### ARMA one step ahead forecast and forecast error

For a ARMA(1,1) process with constant \theta is X_t=\alpha X_{t-1}+\theta +Z_t+\beta Z_{t-1} where Z_T is white noise with mean 0 and...

• Replies: 0
• Views: 947
12-23-2014, 07:15 AM
33. ### Categorical Analysis - Correspondence Analysis

Hi, I want to do a perceptual map in SPSS using 1 categorical variable and several rating variables. I wanted to produce a map like the example...

• Replies: 1
• Views: 2,586
06-09-2011, 12:47 PM
34. ### What formula do i use??? Pls help

Hi guys, I'm doing a project on driving habits and I have some data that I would like to include....I just don't know what formula to use to...

• Replies: 1
• Views: 2,388
05-27-2011, 05:06 AM
35. ### confused about sample mean vs sampling distribution mean

I got this true/false question Consider an infinite population with a mean of 100 and a standard deviation of 20. A random sample of size 64 is...

• Replies: 6
• Views: 10,330
02-18-2011, 08:06 PM
36. ### Stat question

A 12 ounce bottle of beer has 355 ml. The Random Brewing Company sets its machinery so that the contents of a bottle is normally distributed with a...

• Replies: 1
• Views: 5,565
02-19-2011, 01:19 AM
37. ### Confidence intervals

A 95% confidence interval for the mean of a population is computed from a random sample and found to be . We may conclude: A. there is a 95%...

• Replies: 1
• Views: 4,407
03-12-2011, 08:17 PM
38. ### Significance level question

A group of researchers fails to find a significant effect that they predicted. Assuming this effect exists, what should the researchers do in order...

• Replies: 6
• Views: 7,459
03-20-2011, 02:10 PM
39. ### Is it wise for me to take Mathematical Stat (using Casella)

I'm an undergraduate math major, and have taken two semesters of linear algebra, ODEs, General Topology, Real Analysis, Partial Differential...

• Replies: 1
• Views: 1,522
04-06-2012, 05:15 PM
40. ### Lisrel: Goodness-of-fit with FIML and missing data

Hi! When doing a missing-data analysis with FIML in Lisrel, I don't get a lot of goodness-of-fit statistics. I have discovered that you can...

• Replies: 0
• Views: 1,967
11-20-2013, 08:19 AM
41. ### Recommendation for time series books? and a time series question...

Hi, I need to investigate ways to perform time series analysis for data that I have that comes both in sparse and dense formats. The univariate...

• Replies: 1
• Views: 6,113
01-20-2010, 04:59 PM

Hi, I am an adult student struggling with the following: Background: A Survey of Analysts, who are used as representatives of investors in the...

• Replies: 1
• Views: 3,468
01-17-2007, 10:55 AM
43. ### Statistical significance of results in observational study

Hello all, this is my first post. I am seeking some advice on the following study. A group of students is rated on how many questions they ask in...

• Replies: 3
• Views: 928
04-21-2015, 01:47 PM
44. ### Advice on best method of analysis

Hi all, I have a problem and I need some advice as to the best way to approach it. This is a real life problem, not for a course or anything. I'm...

• Replies: 4
• Views: 2,567
12-20-2013, 10:36 AM
45. ### Help with a very basic question

Hi there, I have to undertake a piece of work whereby I need to be able to demonstrate which of a number of different factors have the most...

• Replies: 2
• Views: 2,099
11-10-2011, 09:36 AM
46. ### 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: 1,824
05-05-2016, 07:11 AM
47. ### GW shark study- You give advice on the stats and I give advice on swim spots ;)

Disclaimer: I am fairly new to the stats side of Ecology, I have carried out a bit of field work in my time but have only come over to the analysis...

• Replies: 10
• Views: 1,852
05-28-2013, 01:35 AM
48. ### Create bell curve with a discrete variable

Hello everyone, I like stats but I must warn you that I am far from an expert so please forgive me if my question is a bit basic :). My issue...

• Replies: 1
• Views: 1,210
04-17-2014, 04:36 AM
49. ### 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: 1,885
04-29-2016, 05:57 AM
50. ### Factor scores and multiple regression

Hi all I have a query about how to interpret a regression analysis that I've done following factor analysis. I did Prinicipal axis factoring...

• Replies: 0
• Views: 2,869
06-05-2012, 07:41 AM
51. ### Ranking Performance

In statistics if 10 people take a test you get your mark along with your ranking relative to the rest of the class, I think this is done as...

• Replies: 1
• Views: 2,658
04-19-2007, 11:40 AM
52. ### Data Importance/Relationship Analysis

Hello Forum, My first post.... Im doing a project that extracts certain features from music files. These "feautures" will/may become the inputs...

• Replies: 0
• Views: 1,875
10-08-2008, 05:02 AM
53. ### 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: 1,227
11-13-2016, 12:43 PM
54. ### Confidence interval for pooled variance of multiple populations?

Given: -10 data sets from different populations -20 measurements per data set -Each data set has a statistically different mean -The variance...

• Replies: 1
• Views: 1,622
BGM
01-23-2015, 06:21 AM
55. ### For each of the following rejection regions, determine the value of a, the probabilit

For each of the following rejection regions, determine the value of a, the probability of a Type I error: Show me how to do this problem...

• Replies: 1
• Views: 3,357
09-22-2010, 11:50 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.