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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. Arrow Sticky Thread 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)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 66,716
    09-30-2005, 09:44 AM Go to last post
  2. Sticky Thread 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...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,691
    07-16-2014, 11:01 AM Go to last post
  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...

    Started by cjjb87‎, 11-27-2015 04:52 AM
    count, zero inflated, zero number, zip
    • Replies: 2
    • Views: 1,374
    12-03-2015, 04:54 AM Go to last post
  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...

    Started by cjohnson‎, 06-13-2014 02:37 PM
    cluster, models, tree
    • Replies: 4
    • Views: 1,573
    06-14-2014, 07:35 AM Go to last post
  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...

    Started by cjrisi88‎, 08-17-2010 02:00 PM
    • Replies: 8
    • Views: 3,706
    08-18-2010, 09:56 AM Go to last post
  4. Brewer's Method

    Problem solved...

    Started by cjrisi88‎, 11-26-2010 07:07 PM
    • Replies: 0
    • Views: 2,558
    11-26-2010, 07:07 PM Go to last post
  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...

    Started by cjyoung‎, 03-16-2013 10:58 PM
    • Replies: 4
    • Views: 1,382
    03-17-2013, 09:20 PM Go to last post
  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...

    Started by CK1‎, 06-23-2006 06:56 AM
    • Replies: 1
    • Views: 2,953
    06-24-2006, 10:53 PM Go to last post
  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...

    Started by cK27‎, 08-21-2012 11:35 AM
    • Replies: 0
    • Views: 2,891
    08-21-2012, 11:35 AM Go to last post
  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...

    Started by cK27‎, 08-20-2012 02:11 PM
    • Replies: 0
    • Views: 6,672
    08-20-2012, 02:11 PM Go to last post
  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...

    Started by ck926‎, 04-17-2015 11:11 PM
    • Replies: 2
    • Views: 1,311
    04-18-2015, 09:56 AM Go to last post
  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...

    Started by ckybam69‎, 04-22-2009 11:58 PM
    • Replies: 11
    • Views: 7,006
    07-13-2009, 06:54 PM Go to last post
  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...

    Started by cl2606‎, 05-01-2017 11:38 AM
    • Replies: 0
    • Views: 744
    05-01-2017, 11:38 AM Go to last post
  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...

    Started by Cla‎, 12-11-2013 08:49 AM
    • Replies: 0
    • Views: 722
    12-11-2013, 08:49 AM Go to last post
  13. Statistics help badly needed

    Hello , I am just wondering if anyone here can offer any help to me at all. I'm in college and have to repeat my statistics module and I am finding...

    Started by claffey‎, 07-12-2017 03:54 PM
    • Replies: 0
    • Views: 514
    07-12-2017, 03:54 PM Go to last post
  14. 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...

    Started by Claire‎, 04-10-2006 03:01 PM
    • Replies: 4
    • Views: 2,754
    04-12-2006, 08:42 AM Go to last post
  15. 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...

    Started by Claire Mc‎, 04-25-2007 03:37 PM
    • Replies: 0
    • Views: 3,096
    04-25-2007, 03:37 PM Go to last post
  16. 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...

    Started by claire9‎, 07-24-2007 04:30 AM
    • Replies: 3
    • Views: 2,453
    07-27-2007, 07:58 PM Go to last post
  17. Question Power Analysis for MANOVA and ANOVAS - Please help, going mental!

    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...

    Started by clairealexia‎, 02-05-2007 05:00 AM
    • Replies: 1
    • Views: 12,013
    02-07-2007, 04:57 PM Go to last post
  18. Question 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...

    Started by Clairept‎, 08-06-2012 06:35 PM
    • Replies: 2
    • Views: 8,623
    08-06-2012, 08:20 PM Go to last post
  19. Question Why degrees of freedom=0 for Hosmer–Lemeshow test?

    As part of some research for my dissertation I ran a multiple logistic regression. I was left with a regression model with only one predictor...

    Started by Clairept‎, 07-28-2012 11:02 AM
    • Replies: 7
    • Views: 98,222
    07-28-2012, 07:57 PM Go to last post
  20. Post 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...

    Started by Clairept‎, 08-11-2012 01:34 PM
    • Replies: 3
    • Views: 1,329
    08-11-2012, 03:52 PM Go to last post
  21. 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...

    Started by clara‎, 01-20-2010 10:47 AM
    • Replies: 0
    • Views: 3,473
    01-20-2010, 10:47 AM Go to last post
  22. 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. ...

    Started by Clare J‎, 04-26-2014 06:22 AM
    • Replies: 0
    • Views: 1,884
    04-26-2014, 06:22 AM Go to last post
  23. 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...

    Started by clarkeya‎, 11-28-2012 10:45 AM
    • Replies: 1
    • Views: 1,371
    11-28-2012, 10:49 AM Go to last post
  24. 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...

    Started by Clarke_Kent‎, 08-10-2014 06:23 AM
    adjusted difficulty, adjusted mean, unequal sample sizes
    • Replies: 3
    • Views: 1,670
    08-11-2014, 03:49 PM Go to last post
  25. 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...

    Started by Clarkson‎, 10-28-2013 10:46 AM
    hypothesis testing, poisson distribution
    • Replies: 0
    • Views: 1,814
    10-28-2013, 10:46 AM Go to last post
  26. 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...

    Started by Clarkson‎, 10-27-2013 08:51 AM
    hypothesis test, poisson distribution
    • Replies: 5
    • Views: 4,153
    10-28-2013, 10:25 PM Go to last post
  27. Goodness of fit test for exponential distribution

    The given data below shows the time in intervals in seconds between successive white cars in flowing traffic in an open road.Can these be modeled by...

    Started by Clarkson‎, 12-06-2013 09:42 AM
    • Replies: 0
    • Views: 3,120
    12-06-2013, 09:42 AM Go to last post
  28. 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...

    Started by Clarkson‎, 12-07-2013 04:04 AM
    chi sq test, goodness of fit, hypothesis test, normal distribution
    • Replies: 0
    • Views: 1,080
    12-07-2013, 04:04 AM Go to last post
  29. 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...

    Started by Clarkson‎, 01-05-2014 01:40 PM
    estimator, goodness of fit
    • Replies: 1
    • Views: 1,198
    01-06-2014, 07:12 AM Go to last post
  30. 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...

    Started by Clarkson‎, 01-05-2014 01:16 PM
    goodness of fit, sample variance, self-study, variance
    • Replies: 0
    • Views: 1,997
    01-05-2014, 01:16 PM Go to last post
  31. 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} ,...

    Started by Clarkson‎, 07-07-2014 08:25 AM
    • Replies: 3
    • Views: 1,917
    07-08-2014, 02:42 AM Go to last post
  32. 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...

    Started by Clarkson‎, 07-07-2014 08:10 PM
    estimation, inference, normal distribution, variance estimation
    • Replies: 1
    • Views: 6,885
    07-08-2014, 02:33 AM Go to last post
  33. 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...

    Started by Clarkson‎, 12-16-2014 12:36 PM
    control chart, quality
    • Replies: 0
    • Views: 1,674
    12-16-2014, 12:36 PM Go to last post
  34. 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

    Started by Clarkson‎, 12-17-2014 06:52 AM
    control chart, quality
    • Replies: 0
    • Views: 1,531
    12-17-2014, 06:52 AM Go to last post
  35. 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...

    Started by Clarkson‎, 12-23-2014 07:15 AM
    arma model, forecast error, forecasting, time series
    • Replies: 0
    • Views: 947
    12-23-2014, 07:15 AM Go to last post
  36. 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...

    Started by Claudia‎, 06-08-2011 05:37 AM
    • Replies: 1
    • Views: 2,586
    06-09-2011, 12:47 PM Go to last post
  37. 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...

    Started by claudiacam‎, 05-27-2011 02:04 AM
    • Replies: 1
    • Views: 2,388
    05-27-2011, 05:06 AM Go to last post
  38. 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...

    Started by claudius‎, 02-18-2011 05:17 PM
    • Replies: 6
    • Views: 10,330
    02-18-2011, 08:06 PM Go to last post
  39. 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...

    Started by claudius‎, 02-19-2011 12:44 AM
    • Replies: 1
    • Views: 5,565
    02-19-2011, 01:19 AM Go to last post
  40. 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%...

    Started by claudius‎, 03-12-2011 07:21 PM
    • Replies: 1
    • Views: 4,407
    03-12-2011, 08:17 PM Go to last post
  41. 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...

    Started by claudius‎, 03-18-2011 08:59 PM
    • Replies: 6
    • Views: 7,459
    03-20-2011, 02:10 PM Go to last post
  42. 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...

    Started by claudius‎, 04-06-2012 05:12 PM
    • Replies: 1
    • Views: 1,522
    04-06-2012, 05:15 PM Go to last post
  43. 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...

    Started by claus‎, 11-20-2013 08:19 AM
    goodness-of-fit, missing-data, sem
    • Replies: 0
    • Views: 1,967
    11-20-2013, 08:19 AM Go to last post
  44. Smile 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...

    Started by clayh‎, 01-20-2010 12:36 PM
    • Replies: 1
    • Views: 6,113
    01-20-2010, 04:59 PM Go to last post
  45. Statistical analysis Survey advice Please

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

    Started by ClayNZUK‎, 01-17-2007 10:21 AM
    • Replies: 1
    • Views: 3,468
    01-17-2007, 10:55 AM Go to last post
  46. 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...

    Started by ClaytonFish‎, 04-21-2015 12:21 PM
    • Replies: 3
    • Views: 928
    04-21-2015, 01:47 PM Go to last post
  47. How to determine how 'unusual' a value is within a sample

    I have a question about which sort of statistical analysis is required, and how to go about it, for the following situation. Basically, I've...

    Started by clcochrane‎, 08-15-2012 04:10 PM
    • Replies: 7
    • Views: 22,943
    08-23-2012, 01:42 PM Go to last post
  48. 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...

    Started by Cleland‎, 12-20-2013 05:46 AM
    • Replies: 4
    • Views: 2,567
    12-20-2013, 10:36 AM Go to last post
  49. 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...

    Started by Cleland1981‎, 11-10-2011 06:39 AM
    • Replies: 2
    • Views: 2,099
    11-10-2011, 09:36 AM Go to last post
  50. Question 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...

    Started by Cleliani da Silva‎, 05-04-2016 02:28 PM
    • Replies: 1
    • Views: 1,824
    05-05-2016, 07:11 AM Go to last post
  51. 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...

    Started by Clem‎, 05-06-2013 04:45 AM
    anova ecology biology
    • Replies: 10
    • Views: 1,852
    05-28-2013, 01:35 AM Go to last post
  52. 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...

    Started by ClementCrit‎, 04-17-2014 03:41 AM
    bell-shaped curve, discrete, excel, gauss
    • Replies: 1
    • Views: 1,210
    04-17-2014, 04:36 AM Go to last post
  53. 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...

    Started by Clemente Cortile‎, 04-29-2016 05:57 AM
    • Replies: 0
    • Views: 1,885
    04-29-2016, 05:57 AM Go to last post
  54. 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...

    Started by Clementine‎, 06-05-2012 07:41 AM
    • Replies: 0
    • Views: 2,869
    06-05-2012, 07:41 AM Go to last post
  55. 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...

    Started by clemkonan‎, 04-18-2007 04:44 PM
    • Replies: 1
    • Views: 2,658
    04-19-2007, 11:40 AM Go to last post
  56. Linearity, Homogeneity, randomness, normally distributed data interpretation helPASAP

    Hi, thankyou in advance for your help :) Im conducting a multiple regression to try and predict the maximum age an individual will seek in a...

    Started by clh2‎, 03-20-2014 12:00 PM
    • Replies: 6
    • Views: 1,574
    03-20-2014, 02:19 PM Go to last post
  57. 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...

    Started by Clive Baby‎, 10-08-2008 05:02 AM
    • Replies: 0
    • Views: 1,875
    10-08-2008, 05:02 AM Go to last post
  58. 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...

    Started by clivegibbs‎, 11-13-2016 12:43 PM
    friedman test, survey, wilcoxon signed-rank test
    • Replies: 0
    • Views: 1,227
    11-13-2016, 12:43 PM Go to last post
  59. 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...

    Started by Clk‎, 01-22-2015 09:46 PM
    • Replies: 1
    • Views: 1,622
    01-23-2015, 06:21 AM Go to last post
  60. 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...

    Started by Clomo4star‎, 09-22-2010 10:48 PM
    • Replies: 1
    • Views: 3,357
    09-22-2010, 11:50 PM Go to last post

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