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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: 66,786
    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: 196,807
    07-16-2014, 11:01 AM Go to last post
  1. Hypothesises

    Loblaws manufactures baskets on two different manufacturing processes. Because the management of this company is interested in determining if process...

    Started by annalynne‎, 06-09-2009 12:37 AM
    • Replies: 1
    • Views: 2,137
    06-09-2009, 12:54 AM Go to last post
  2. Sample Sizes

    You test whether a chocolate production process is achieving the standard output of 120 chocolates/batch. The standard population deviation is 5 and...

    Started by annalynne‎, 06-09-2009 02:12 AM
    • Replies: 1
    • Views: 3,156
    06-09-2009, 09:58 AM Go to last post
  3. Population

    As the governor of Illinois, you are contemplating on whether to call an election. You want one if you think more than half of the voters will vote...

    Started by annalynne‎, 06-09-2009 07:00 PM
    • Replies: 0
    • Views: 2,401
    06-09-2009, 07:00 PM Go to last post
  4. Exclamation Cox Proportional hazard model result interpretation

    Could anyone please help me to interpret results from Cox Proportional hazard model result interpretation.:wave: I am using SAS ENTERPRISE Guide and...

    Started by AnnaPanna‎, 03-24-2014 02:49 PM
    • Replies: 4
    • Views: 2,349
    03-25-2014, 06:21 AM Go to last post
  5. Outliers

    Hello there, I have data set of 5846 observations out of which 15 observations are outliers. I need to perform multiple linear regression which ...

    Started by AnnaPanna‎, 05-01-2014 03:52 PM
    linear regression, outliers, regression analysis, regression assumption, regression model
    • Replies: 1
    • Views: 1,129
    05-01-2014, 04:43 PM Go to last post
  6. 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...

    Started by annapbarnes‎, 07-14-2014 12:07 PM
    • Replies: 3
    • Views: 1,555
    07-15-2014, 06:44 AM Go to last post
  7. Hypotheses Testing

    Can someone tell me if my null and alternative hypotheses below are correct for this? Ho = Consumers shop online and in clothing stores equally....

    Started by anna_n10‎, 03-19-2009 07:14 AM
    • Replies: 0
    • Views: 2,450
    03-19-2009, 07:14 AM Go to last post
  8. Group Analysis- Help with interpretation

    I need to compute within and between group sum of squares and to deduce if the grouping is justified. I have computed SS without a problem, but the...

    Started by anna_s‎, 01-29-2009 05:47 AM
    • Replies: 0
    • Views: 2,392
    01-29-2009, 05:47 AM Go to last post
  9. Goodness-of-fits tests.

    I honestly have no idea where to even start in this assignments. Any type of ell would be greatly appreciated. I can easily do the problems given in...

    Started by annc‎, 11-25-2014 11:08 PM
    goodness of fit, goodness-of-fit, hypothesis, level of significance
    • Replies: 1
    • Views: 1,712
    11-26-2014, 12:21 AM Go to last post
  10. help on chi-square test

    Hi, can somone help me with doing a Chi-square test or Yates corrected chi-square test of the data file I have attached. I dont get it, or is the...

    Started by Anne3‎, 05-18-2016 03:06 AM
    • Replies: 0
    • Views: 1,061
    05-18-2016, 03:06 AM Go to last post
  11. Data analysis for Likert scale means

    I am not certain which test to apply for my data and any help will be gratefully received. I am told that I cannot use regression analysis with...

    Started by AnnEarley‎, 03-30-2010 04:57 PM
    • Replies: 0
    • Views: 6,344
    03-30-2010, 04:57 PM Go to last post
  12. Need help with p-value and test statistic!

    A manufacturer of insecticides has developed two formulations for new insecticides using two different compounds, A and B. To test the...

    Started by annedroid‎, 05-15-2010 10:19 PM
    • Replies: 1
    • Views: 4,735
    05-17-2010, 12:41 AM Go to last post
  13. Question Two girls one bonferroni - adjustment according to which families?

    Hey guys We are two girls in need of some statistical guidance in our bachelor project in medicine. As it is the easter holidays, our advisor is not...

    Started by Annemarie‎, 04-03-2015 07:50 PM
    • Replies: 0
    • Views: 988
    04-03-2015, 07:50 PM Go to last post
  14. Help with Repeated Measures Data Analysis

    Hello, I have a very limited set of repeated measures data that are assessment scores over three years, with 1,055 participants who have a range...

    Started by AnneS‎, 04-13-2016 06:13 PM
    • Replies: 3
    • Views: 982
    04-14-2016, 03:59 PM Go to last post
  15. Independent t-test - interpreting significance if sizes of samples differ greatly

    Hello, I ran an independent t-test on two samples (composite scores of a health assessment for two different groups of youth by age category). ...

    Started by AnneS‎, 04-19-2016 11:18 AM
    • Replies: 3
    • Views: 1,264
    04-19-2016, 02:49 PM Go to last post
  16. Reliable Change Index

    Hello, If I have a sample of 137 individuals with three assessment results (first, 1YR follow-up and 2-Yr follow-up), can I calculate the Reliable...

    Started by AnneS‎, 05-04-2016 05:18 PM
    • Replies: 0
    • Views: 2,143
    05-04-2016, 05:18 PM Go to last post
  17. Inter-Rater Reliability - Question Combines Stats and SPSS Procedural Components

    Hello, I have a sample of 5,000 health assessments (with ratings from 1-5 on 7 dimensions that roll up to a composite score) completed on 1,400...

    Started by AnneS‎, 07-27-2016 04:16 PM
    • Replies: 2
    • Views: 891
    07-28-2016, 03:27 PM Go to last post
  18. Ordinal data+ independent factors+Marketing analysis+SPSS= HELP!!!!

    Hi, I desperately need help analyisng my survey data. Which tests do i use in order to test the relationship between my variables, and to see...

    Started by annespss‎, 10-25-2011 07:20 AM
    analysis, categorical data, marketing survey, ordinal, spss
    • Replies: 7
    • Views: 3,356
    10-26-2011, 09:07 PM Go to last post
  19. Should I use the t-test or not?

    I am processing the data of an experiment where I look at how an increased social rank (1-20) in cattle effects the length of their heat period. My...

    Started by annesveberg‎, 10-27-2013 04:35 PM
    • Replies: 0
    • Views: 1,006
    10-27-2013, 04:35 PM Go to last post
  20. Ordered Probit Model for Panel Data in Stata?

    Hi there, I am having a little problem with my ordered dependent variable 'Physical Integrity Rights (PIR).' I want to study the effects of...

    Started by AnneVM‎, 07-30-2013 02:31 AM
    • Replies: 0
    • Views: 2,591
    07-30-2013, 02:31 AM Go to last post
  21. Please help a 52 year old, last in school 1983

    Hi everyone. My name is Anne. I'm back to school to finish my degree. I haven't been in school since 1983. Psychological Statistics is my first...

    Started by annewinslow‎, 06-09-2008 08:01 PM
    • Replies: 6
    • Views: 2,587
    06-10-2008, 10:46 AM Go to last post
  22. hosmer lemeshow goodness of fit statistic

    am running a series of regressions and have the HL GOF for each. Does anyone know if there is a scale which describes the fit for example if the...

    Started by annfitz‎, 06-01-2011 03:14 PM
    • Replies: 0
    • Views: 2,595
    06-01-2011, 03:14 PM Go to last post
  23. confidence intervals logistic regression

    I have two different models in stata One covers the period 1970-1999 and gives an odds ratio of 1.35 with a confidence interval of (1.10,1.64) ...

    Started by annfitz‎, 06-09-2011 01:34 PM
    • Replies: 0
    • Views: 1,971
    06-09-2011, 01:34 PM Go to last post
  24. Including variance (error bars) with a binomial proportion

    I have a list of chemicals, their assay test results, and a binomial column of whether or not the assay test result was high enough to be considered...

    Started by annie97‎, 08-04-2011 12:23 PM
    • Replies: 0
    • Views: 2,888
    08-04-2011, 12:23 PM Go to last post
  25. Question Interquartile Range

    What is the interquartile range of a normal distribution of IQ scores with a mean of 100 and a variance of 225? I think it is 20. I found out the...

    Started by Anniebell‎, 06-11-2013 06:51 PM
    • Replies: 2
    • Views: 1,863
    06-12-2013, 12:29 AM Go to last post
  26. Large Sample Confidence Interval for the Mean - Problem is it right ???

    The president of Jones Bank asked his research team to determine the average waiting time for its customer. A study of 100 customers was conducted...

    Started by ANNJALA‎, 10-13-2016 02:15 PM
    confidence intervals, wait time
    • Replies: 3
    • Views: 1,066
    10-14-2016, 07:02 AM Go to last post
  27. correct statistical significance approach

    Hi All, Quick question. I want to determine if there is statistical significance to some variations i am seeing within a set of time durations...

    Started by annodomini‎, 03-20-2015 07:57 AM
    • Replies: 3
    • Views: 1,060
    03-20-2015, 09:19 AM Go to last post
  28. Analysing "consistency"

    Dear Statistics People, I have a problem. I wish to track the pitch of a waveform which should be simple. I need to know if I have a waveform...

    Started by Annoying Twit‎, 04-23-2010 10:56 AM
    • Replies: 0
    • Views: 1,996
    04-23-2010, 10:56 AM Go to last post
  29. Which analysing technique do I use?

    Hi everyone! First of all sorry for my bad English, but I am Flemish. I am currently working on a paper for school, about the relationship...

    Started by Annvdb‎, 03-03-2014 11:03 AM
    • Replies: 7
    • Views: 1,813
    03-03-2014, 11:48 PM Go to last post
  30. Creating index with a string

    So I want to create an index for activity level. We have the following variabeles (I translated a couple of things to english, tis originally in...

    Started by Annvdb‎, 03-06-2014 02:00 AM
    index, string
    • Replies: 0
    • Views: 1,290
    03-06-2014, 02:00 AM Go to last post
  31. How to select only 1 country in dataset SPSS out of many

    I need to do an analyzes on the European social survey but only for 1 country : slovenia. How do I select that with SPSS? I tried with the...

    Started by Annvdb‎, 03-08-2014 04:59 AM
    • Replies: 0
    • Views: 1,566
    03-08-2014, 04:59 AM Go to last post
  32. What to do with missings?

    I am computing a scale 'political participation' out of 7 questions that measure political paritcipation. For example: I voted in the last elections...

    Started by Annvdb‎, 03-27-2014 12:22 PM
    • Replies: 1
    • Views: 1,373
    03-27-2014, 12:34 PM Go to last post
  33. Multinomial logistic regression categorial scale question

    I have data about political participation where respondents answers questions 7 (yes or no) that indicate some form of political participation. for...

    Started by Annvdb‎, 03-27-2014 05:05 AM
    multinomial regression
    • Replies: 1
    • Views: 874
    03-27-2014, 05:30 AM Go to last post
  34. 3-way vs 2-way ANOVA

    I have done a 2-way ANOVA to check the impact of my 2 treatments (EXP, 2groups and INFO, 3 groups) on my dependent variable and got significant main...

    Started by anny‎, 07-30-2012 01:34 AM
    • Replies: 0
    • Views: 1,863
    07-30-2012, 01:34 AM Go to last post
  35. how to report contrasts?

    how do i report contrasts i did in a 2x3 anova, in my thesis?

    Started by anny‎, 07-31-2012 01:58 AM
    • Replies: 5
    • Views: 3,863
    08-01-2012, 04:03 AM Go to last post
  36. How to find weber fractions from a confusion matrix

    I have a confusion matrix for a 4 class classification problem which looks this: My hypothesis is that group 3 is easiest to classify. Somebody...

    Started by anon91‎, 07-28-2014 04:22 PM
    • Replies: 0
    • Views: 1,147
    07-28-2014, 04:22 PM Go to last post
  37. Empirical Research from a Sample

    Hi, Im looking for some help carrying out empirical research that I need to do for an assignment. The data is based on a sub sample of a survey given...

    Started by Anonan‎, 12-04-2015 09:38 AM
    • Replies: 0
    • Views: 1,310
    12-04-2015, 09:38 AM Go to last post
  38. Covariance of items from a SLR

    Hi I've got a couple covariance problems and I have 0 idea how to do these. Consider the SLR model y = Beta naught + (Beta one)x + E ...

    Started by Anonymouse3‎, 02-10-2010 11:20 PM
    • Replies: 1
    • Views: 6,275
    02-11-2010, 03:01 AM Go to last post
  39. Slope parameter info if intercept known?

    Consider the SLR y = b +mx + e Where the intercept b is known. a) Find least squares estimator of m for this model. b) What's the variance...

    Started by Anonymouse3‎, 02-14-2010 10:28 PM
    • Replies: 8
    • Views: 4,727
    08-11-2012, 09:22 PM Go to last post
  40. Help: Dummy Variable Regression with two components

    Here is the question: I was thinking it might look something like Y=B0+B1D+B2(X1i.D)...

    Started by anon_ch‎, 04-05-2013 08:47 AM
    • Replies: 1
    • Views: 1,192
    04-05-2013, 10:33 AM Go to last post
  41. Please help! Paired T test with additional variable influence

    Hello everyone. I have a process in which users complete a given task, and the time it takes them complete it is measured. An upcoming change to...

    Started by Anotherdream‎, 10-17-2013 08:33 AM
    • Replies: 0
    • Views: 1,154
    10-17-2013, 08:33 AM Go to last post
  42. Logistic Regression and Panel data -Does it matter?

    Hello everyone. I am still very new to statistics and am having an issue. I am presented with a loan level data set (thousands of loans over a 10-20...

    Started by Anotherdream‎, 05-23-2013 09:35 AM
    • Replies: 0
    • Views: 1,321
    05-23-2013, 09:35 AM Go to last post
  43. Regression not correct model?

    Hello everyone. I would like to develop a model that would "predict" future pre-payment rates of a given pool of loans. The question I have is, if...

    Started by Anotherdream‎, 06-27-2013 11:42 AM
    • Replies: 3
    • Views: 1,267
    06-27-2013, 05:38 PM Go to last post
  44. Random Sampling Over time to make one random sample?

    Hello everyone. I have an interesting question that was brought to me by a friend and I do not know the "correct" way to do it. Okay so basically,...

    Started by Anotherdream‎, 08-26-2013 06:23 PM
    • Replies: 12
    • Views: 2,882
    08-30-2013, 12:42 PM Go to last post
  45. Productivity vs Quality, Ordering by process.

    Hello everyone. I am very new to statistics and I have been given a rather generic direction and I am not sure where to being. Basically we have...

    Started by Anotherdream‎, 10-16-2013 10:25 AM
    • Replies: 2
    • Views: 1,462
    10-21-2013, 10:55 AM Go to last post
  46. Sampling by Balance, not enough loans per bucket

    Hello everyone. I Have been asked by a client to randomly sample loans from a distribution. The client will only pay for 150 loans, and they want two...

    Started by Anotherdream‎, 11-22-2013 10:39 AM
    • Replies: 0
    • Views: 1,226
    11-22-2013, 10:39 AM Go to last post
  47. Logistic regression or simple frequency analysis

    Hello everyone. I have been tasked with finding correlations between missing data in variable A comapred with the observations (groups) in variable...

    Started by Anotherdream‎, 11-05-2013 02:37 PM
    • Replies: 3
    • Views: 1,783
    11-06-2013, 02:03 PM Go to last post
  48. Regression on multiple distributions within one dataset

    Hello everyone. I am attempting to do a regression analysis on the sales price of a property. I have several variables of interest. The main ones...

    Started by Anotherdream‎, 04-08-2014 10:44 PM
    • Replies: 0
    • Views: 1,375
    04-08-2014, 10:44 PM Go to last post
  49. Which model would be best to do this

    Hello everyone. I have been given a data set and tasked with coming up with a way to compare different people (real estate professionals) to each...

    Started by Anotherdream‎, 04-08-2014 10:49 PM
    • Replies: 0
    • Views: 908
    04-08-2014, 10:49 PM Go to last post
  50. Statistical Test for differences Across time Between Independent Groups

    Hello everyone. I am trying to determine if there is a statistical model that would allow someone to test for differences between two different...

    Started by Anotherdream‎, 04-09-2014 03:37 PM
    • Replies: 6
    • Views: 1,672
    04-10-2014, 07:04 PM Go to last post
  51. When can the normal be used to approximate the hyperGeometric?

    Hello all. I know the normal can be used to approximate the binomial when p is not close to 0 or 1, and when the population is extremely large...

    Started by Anotherdream‎, 04-09-2014 07:40 PM
    • Replies: 0
    • Views: 1,475
    04-09-2014, 07:40 PM Go to last post
  52. Sampling Broken into Multiple Groups: What's wrong with this?

    Hello. I have a question where i have to determine what is incorrect with the following sampling methodology to determine sample sizes. The problem...

    Started by Anotherdream‎, 10-09-2014 08:09 AM
    • Replies: 0
    • Views: 1,236
    10-09-2014, 08:09 AM Go to last post
  53. Time Series out of sample forecast period?

    Hello everyone. It is my understanding that if one wants to built a time series model on data a time series that went from 2000 to today (2015)...

    Started by Anotherdream‎, 03-05-2015 03:10 PM
    • Replies: 1
    • Views: 1,002
    03-05-2015, 03:41 PM Go to last post
  54. Calculating degrees of freedom when sample sizes are unequal

    Hello, Apologies if this seems quite trivial (I'm afraid I don't have a statistics background). I have been conducting unpaired Student's t-tests...

    Started by AnotherStudent‎, 12-28-2013 10:21 AM
    • Replies: 2
    • Views: 1,801
    12-30-2013, 12:02 PM Go to last post
  55. Some confuse about Regression Model(with example)

    I am a college student who has studied basic statistics. Recently, i have read a paper which call "Creating a Profitable Betting Strategy for...

    Started by anovatable‎, 12-09-2014 05:40 AM
    • Replies: 0
    • Views: 1,182
    12-09-2014, 05:40 AM Go to last post
  56. Degrees of Freedom

    Hi, I have tried to explain the concept of degrees of freedom as I couldnt find a satisfactory explanation of this concept on the internet anywhere....

    Started by Anshuman‎, 07-22-2011 07:11 AM
    • Replies: 0
    • Views: 1,527
    07-22-2011, 07:11 AM Go to last post
  57. difference between Critical Difference (CD) and Least Significant Difference (LSD)

    Hi, I am Ansuman Biswas from India. I have just started working on basic of ANOVA in our chemical lab work. Can anybody tell me what is the...

    Started by ansumanbiswas‎, 11-03-2007 01:12 AM
    • Replies: 1
    • Views: 19,810
    06-26-2010, 07:55 AM Go to last post
  58. 2 or more DV in the regression

    Hello, I have 3 DV's and 10 IV's. I want to know for each dependent variable separately by which independent variable it is affected most? what...

    Started by ansunil‎, 04-04-2013 01:32 AM
    • Replies: 0
    • Views: 925
    04-04-2013, 01:32 AM Go to last post
  59. Comparing unequal sized sample groups?

    Hi all, I have conducted a survey which includes 40 likert scale questions and is targetted at two groups; adopters and non-adopters of a certain...

    Started by Ant‎, 07-21-2008 04:58 AM
    • Replies: 0
    • Views: 3,437
    07-21-2008, 04:58 AM Go to last post
  60. Survival analysis with long term survivors

    Hi all, Hope someone can offer me some advice here. I need some help getting off the ground with running a survival analysis with long term...

    Started by AnthMonkey‎, 07-19-2012 05:54 AM
    long term survivors, survival analysis
    • Replies: 2
    • Views: 1,445
    07-19-2012, 07:42 AM Go to last post

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