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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 196,763
    07-16-2014, 11:01 AM Go to last post
  2. 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: 66,761
    09-30-2005, 09:44 AM Go to last post
  1. Inter-Rater Reliability for Diagnostic and Continuous Measure

    Hi All, I am hoping to compute the inter-rater reliability (IRR) of a diagnostic measure and a continuous screening measure. For the...

    Started by bozatron‎, 04-17-2015 08:57 PM
    • Replies: 4
    • Views: 1,177
    04-19-2015, 12:45 AM Go to last post
  2. When study says 90% more likely (and it's merely an increase from 1% to 2% of people)

    Study finds a person is 90 percent more likely to have explosive diarrhea when they eat a certain food (OR = 1.9; 95% CI, 1.3 – 2.8; p = .003). ...

    Started by CrunchAndSee‎, 04-18-2015 09:56 AM
    • Replies: 0
    • Views: 1,090
    04-18-2015, 09:56 AM Go to last post
  3. 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: 1,312
    04-18-2015, 09:56 AM Go to last post
  4. Choosing the correct statistical analyses

    Hello, I have collected data using the Eysenck Personality Questionnaire (EPQ) that has 4 subscales and another self-created survey that measures...

    Started by djv220‎, 04-18-2015 08:58 AM
    • Replies: 0
    • Views: 862
    04-18-2015, 08:58 AM Go to last post
  5. Negative Confidence Interval

    3. In two wards for elderly women in a nursing home the following levels of hemoglobin were found: Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5,...

    Started by eamanfor‎, 04-17-2015 01:27 AM
    confidence interval, mean difference, negative values
    • Replies: 1
    • Views: 1,376
    04-17-2015, 07:57 AM Go to last post
  6. Controlling for earlier data points in a mediation (with covariates)

    Hello :-) In my mediation analysis I have a personality trait as my X (independent variable), a behavior as M (mediator) and medical problems as Y...

    Started by LtStarbuck‎, 04-17-2015 04:44 AM
    • Replies: 0
    • Views: 1,094
    04-17-2015, 04:44 AM Go to last post
  7. Challenging Statistical Significant

    In 18 patients with Everley's syndrome, the mean level of plasma phosphate was 1.7 mmol/l (millimoles per liter) with a standard deviation of 0.8...

    Started by eamanfor‎, 04-17-2015 01:18 AM
    two-sided test
    • Replies: 0
    • Views: 1,399
    04-17-2015, 01:18 AM Go to last post
  8. Red face Confidence Interval

    In 22 patients with an unusual liver disease, the plasma alkaline phosphatase had a mean value of 39 IU/l (International Units per liter), standard...

    Started by eamanfor‎, 04-17-2015 01:12 AM
    confidence interval, population mean, t-test
    • Replies: 0
    • Views: 762
    04-17-2015, 01:12 AM Go to last post
  9. Unhappy Mean Significance Statistical Test

    3. In two wards for elderly women in a nursing home the following levels of hemoglobin were found: Ward A: 12.2, 11.1, 14.0, 11.3, 10.8, 12.5,...

    Started by eamanfor‎, 04-16-2015 06:18 PM
    confidence interval, statistical tests
    • Replies: 1
    • Views: 1,548
    04-16-2015, 06:41 PM Go to last post
  10. Unhappy Research Question Statistical Method

    In a study by Lapidus et al., one of the research questions was whether the proportion of physicians who screened patients in the emergency...

    Started by eamanfor‎, 04-16-2015 06:21 PM
    research design, statistical method
    • Replies: 1
    • Views: 1,360
    04-16-2015, 06:40 PM Go to last post
  11. Two-sided test Hypothesis

    2. In 18 patients with Everley's syndrome, the mean level of plasma phosphate was 1.7 mmol/l (millimoles per liter) with a standard deviation of 0.8...

    Started by eamanfor‎, 04-16-2015 06:24 PM
    hyposthesis, null hypothesis
    • Replies: 1
    • Views: 1,090
    04-16-2015, 06:40 PM Go to last post
  12. Unhappy Confidence Interval

    In 22 patients with an unusual liver disease, the plasma alkaline phosphatase had a mean value of 39 IU/l (International Units per liter), standard...

    Started by eamanfor‎, 04-16-2015 06:25 PM
    confidence interval
    • Replies: 1
    • Views: 1,426
    04-16-2015, 06:39 PM Go to last post
  13. Control variates, Monte Carlo integration

    Exercise: Experiment with as many variance reduction techniques as you can think of to apply to the problem of evaluating P(N>2.5) where N~N(0,1). ...

    Started by askazy‎, 04-16-2015 03:57 PM
    • Replies: 0
    • Views: 893
    04-16-2015, 03:57 PM Go to last post
  14. Finding MLE by factor analyzing the correlation matrix

    In the book "Applied Multivariate Statistical Analysis" written by Johnson and Wichern, they have mentioned that the MLEs ($\hat{L_z}$) are obtained...

    Started by Blain Waan‎, 04-16-2015 07:22 AM
    factor analysis
    • Replies: 0
    • Views: 1,179
    04-16-2015, 07:22 AM Go to last post
  15. Understanding the “computationally convenient uniqueness condition” of factor model

    In the book "Applied Multivariate Statistical Analysis" written by Johnson and Wichern, they have mentioned about a computationally convenient...

    Started by Blain Waan‎, 04-16-2015 07:02 AM
    factor analysis
    • Replies: 0
    • Views: 2,594
    04-16-2015, 07:02 AM Go to last post
  16. Appropriate Choice of Model to look at differences

    Hi there, I have a question about what type of model / analysis I should use for the type of data I would like to analyse. I have a total of 60...

    Started by drewsta‎, 04-16-2015 03:08 AM
    • Replies: 1
    • Views: 1,225
    04-16-2015, 04:02 AM Go to last post
  17. trick for making samples with and without replacement

    hi, is there any smart way to make samples with and without replacement for large populations for e.g if population is 1,3,5,8,9,7,5. waiting for...

    Started by sara b‎, 04-15-2015 10:09 AM
    • Replies: 4
    • Views: 1,525
    04-16-2015, 12:29 AM Go to last post
  18. a book which introduce neural network?

    Dear all, I am currently working on model specification for neural networks and so look for a book which introduces neural networks including...

    Started by t.wang21@yahoo.com.au‎, 04-15-2015 10:23 PM
    • Replies: 0
    • Views: 938
    04-15-2015, 10:23 PM Go to last post
  19. Homework Woes [Intro Statistics Help Needed]

    I have one really simple question. Do you test the null hypothesis or the alternative hypothesis in hypothesis testing? Examples of questions...

    Started by Edward Kunz‎, 04-15-2015 07:57 PM
    • Replies: 1
    • Views: 1,519
    04-15-2015, 08:14 PM Go to last post
  20. Post Urgent help- statistically significant mean differences

    My task is to Test whether there are statistically significant mean differences in the log returns between the y stock and the S&P. The data for...

    Started by JamesBarnett‎, 04-15-2015 03:13 PM
    • Replies: 1
    • Views: 1,152
    04-15-2015, 03:21 PM Go to last post
  21. Strange post hoc analysis results?

    Dear Talkstats I have made a dataset where i have treated the same cells with two different drugs. I have stimulated them with different...

    Started by Pra28‎, 04-15-2015 02:21 AM
    • Replies: 0
    • Views: 982
    04-15-2015, 02:21 AM Go to last post
  22. Understanding contribution of various dealers in portfolio

    Hi All Have data for 1 year for 25 Different dealers and their subsequent Utilization of money to the credit limit allocated to them , was...

    Started by bhrigu nair‎, 04-15-2015 02:00 AM
    • Replies: 0
    • Views: 1,034
    04-15-2015, 02:00 AM Go to last post
  23. Forecasting Rates of Return

    Hi, I have 10 years of monthly rates of return between 31/03/2005 and 31/03/2015 on an investment which I would like to use to forecast the twelve...

    Started by GraemeA‎, 04-14-2015 02:30 PM
    • Replies: 0
    • Views: 1,157
    04-14-2015, 02:30 PM Go to last post
  24. Strange regression results

    Hello, I'm working on analyzing data from a two-alternative forced-choice task, where participants had to choose between two options and were more...

    Started by lioneln‎, 04-14-2015 10:03 AM
    • Replies: 0
    • Views: 785
    04-14-2015, 10:03 AM Go to last post
  25. Comparing means of datasets

    Dear all, I am doing research with plants, where we compare different treatments and want to know if there is statistical difference between...

    Started by JoachimPCS‎, 04-14-2015 03:27 AM
    • Replies: 0
    • Views: 843
    04-14-2015, 03:27 AM Go to last post
  26. Help with normality test using SPss

    hi all, I have an assignment question that ask to provide a summary statistic for a categorical data(male/female) with a total respondent of 100...

    Started by Vodada‎, 04-11-2015 04:09 AM
    • Replies: 4
    • Views: 2,535
    04-13-2015, 01:54 PM Go to last post
  27. Unhappy What statistical analysis to use for a ordinal scale questionnaire?

    Dear Experts, Im a noob when it comes to statistics. So please pardon my lack of knowledge in this post. I need to do a statistical analysis on...

    Started by swetha‎, 04-13-2015 12:17 AM
    hypothesis test, statistical analysis
    • Replies: 8
    • Views: 2,246
    04-13-2015, 01:15 PM Go to last post
  28. Unpaired t-test and F-test

    Hello!!! I would like some help with t-tests. I perform unpaired t-test and the programm performs also F-test for equal variances. My t-test...

    Started by vasmour‎, 04-12-2015 11:54 AM
    • Replies: 6
    • Views: 2,511
    04-13-2015, 07:06 AM Go to last post
  29. One-way ANOVA and planned comparisons - HELP!

    Hi all, I'm currently running a Psychology experiment: the effect of background music on memory and mood. I will be using SPSS to conduct two...

    Started by jwren‎, 04-12-2015 11:05 AM
    ancova, anova, correlation, planned comparisons, statistical analysis
    • Replies: 5
    • Views: 1,761
    04-13-2015, 05:32 AM Go to last post
  30. What test to do to compare means, not fo experimental data, but of real world data

    I want to also understand if the test to compare means are meant to be carried out only for experimental data. What about real world data? I...

    Started by jjsz63‎, 04-11-2015 05:37 PM
    • Replies: 8
    • Views: 1,739
    04-13-2015, 03:06 AM Go to last post
  31. Variance testing

    Hello everyone, I would like a little help to statistics. I have to compare three groups. I am using GraphPad Prism Programm. I had applied...

    Started by vasmour‎, 04-11-2015 03:09 AM
    • Replies: 4
    • Views: 1,869
    04-12-2015, 02:32 PM Go to last post
  32. Unhappy When do I use chi square and when a t-test? I just don't get the difference...

    Hi there, I'm trying to teach myself statistics from a book but I don't understand when I have to use t test and when chi squares. I tried to look...

    Started by mathsucks‎, 04-11-2015 02:20 PM
    chi square, difference, difficult, t test, usage
    • Replies: 5
    • Views: 1,634
    04-12-2015, 02:24 PM Go to last post
  33. Exclamation Not sure which test to do, please help!

    Hi, I'm doing a study on shark movements via acoustic tracking. The data I get whenever a shark is detected is its ID, time (hh), depth (m, e.g....

    Started by jamessharksaver‎, 04-11-2015 06:11 AM
    • Replies: 1
    • Views: 915
    04-12-2015, 02:14 PM Go to last post
  34. homogeneity slopes

    I'm doing some analysis of ANCOVA, but do not know if I'm not knowing interpret the results. I understand that an ANCOVA would be an ANOVA with the...

    Started by jszmaia‎, 04-11-2015 01:58 PM
    r homogeneity slopes
    • Replies: 4
    • Views: 1,906
    04-12-2015, 11:37 AM Go to last post
  35. p Value + Sample Size in Chi Squared Tests

    Hi All, This is my first post and I'm hoping someone could help me with the following question: a) The obtained p value for a contingency table...

    Started by riddelc‎, 04-10-2015 07:25 PM
    • Replies: 1
    • Views: 1,435
    04-11-2015, 08:37 PM Go to last post
  36. ANOVA past exam question help

    Hi everyone, I'm looking over last years exam paper and one of the questions asks me to interpret an one-way independent ANOVA SPSS output and report...

    Started by ajr237‎, 04-11-2015 06:01 PM
    • Replies: 0
    • Views: 866
    04-11-2015, 06:01 PM Go to last post
  37. Unhappy i was left alone in my group i need help for next step

    this is my research problem and hypothesis Research Problem: Overall Performance of the Richard Electrical Services. Does the customer of...

    Started by akatzuke13‎, 04-10-2015 05:30 PM
    • Replies: 3
    • Views: 1,317
    04-11-2015, 11:28 AM Go to last post
  38. 0.00000 significance value

    Hi everyone, New to Talk Stats, so be nice! I have looked for an answer to my problem on previous posts but have not been able to find anything...

    Started by marson93‎, 04-10-2015 10:30 AM
    kruskal-wallis, mann-whitney u, significance testing, spss, stats help
    • Replies: 4
    • Views: 1,607
    04-11-2015, 07:56 AM Go to last post
  39. Unhappy normal distribution probabilities

    The lifetime of a certain brand of battery is normally distributed with a mean value of 10 hr and a standard deviation of 0.8 hr when it is used in a...

    Started by fox100‎, 04-10-2015 06:48 PM
    • Replies: 1
    • Views: 2,987
    04-11-2015, 02:01 AM Go to last post
  40. hypothesis test

    I have a sample of 250 credit card applications. 29 of them or 11.6% were processing errors. The goal is that no more than 10% of them are processed...

    Started by awkirwan‎, 04-10-2015 06:52 PM
    • Replies: 0
    • Views: 1,168
    04-10-2015, 06:52 PM Go to last post
  41. Is there a difference between z-score and effect size?

    I just started teaching statistics to myself (I never had it in school but will need it when I start University). I have problems with z-scores...

    Started by mathsucks‎, 04-09-2015 04:26 PM
    difference, effect size, score, variables, z-score
    • Replies: 2
    • Views: 2,634
    04-10-2015, 05:39 PM Go to last post
  42. Number of parameters in my model?

    This is probably a very basic question, so my apologies! I'm trying to make sure I have the correct number of parameters in my model so I insert the...

    Started by wernie07‎, 04-09-2015 10:48 PM
    • Replies: 3
    • Views: 1,067
    04-10-2015, 03:38 AM Go to last post
  43. is my regression incorrect ?

    Hi eberybody I made a multiple regression and when I applied my estimated coefficients to the data to predict the dependent variable values the...

    Started by Ihssanee‎, 04-08-2015 11:40 AM
    • Replies: 2
    • Views: 1,408
    04-09-2015, 03:34 PM Go to last post
  44. Wins > 50% for everyone in a pool of players

    Is it possible for every single player in a pool of players to end up with a > 50% win/loss ratio. Providing that the game being played can have...

    Started by albatross4242‎, 04-08-2015 04:05 PM
    • Replies: 2
    • Views: 1,356
    04-08-2015, 06:27 PM Go to last post
  45. Long HW question..Struggling so much with this question

    2. Let X1, X2, . . . , Xn be independently and identically distributed geometric random variables, as in Written Assignment 2 and the Midterm...

    Started by californiacating0387‎, 04-08-2015 03:01 PM
    • Replies: 0
    • Views: 1,209
    04-08-2015, 03:01 PM Go to last post
  46. validating standard error value as part of a Kaplan-Meier calculation

    Hello, Thank you for your time. The attached file contains a table created by some R code. Below that table, I am trying to validate the Estimate...

    Started by bobly‎, 04-08-2015 01:58 PM
    • Replies: 0
    • Views: 930
    04-08-2015, 01:58 PM Go to last post
  47. How to show that b1 and SSE are independent?

    under normal sampling zero covariance implies independence. So I tried to solve COV(b1,SSE). COV(b1,SSE) = E =... =E(b1*SSE)-beta1*sigma^2*(n-2)...

    Started by dapone21‎, 04-08-2015 08:07 AM
    proof, regression analysis
    • Replies: 0
    • Views: 2,785
    04-08-2015, 08:07 AM Go to last post
  48. Original source for skewness formulas

    The past few days I've dug into Skewness and was trying to find some original sources. The most common formula for skewness in textbooks is:...

    Started by blubblub‎, 03-29-2015 06:44 AM
    • Replies: 3
    • Views: 2,330
    04-08-2015, 07:42 AM Go to last post
  49. Normal Distribution Curve and Standard Deviation

    Hi. I've been asked to implement a traffic light system in the office to highlight employees who are requesting to much or too little medical...

    Started by Sylbaryn‎, 04-07-2015 04:34 PM
    • Replies: 0
    • Views: 1,293
    04-07-2015, 04:34 PM Go to last post
  50. Statistical trend presentation of sports time results

    Hi, I am an electronics engineer and I have designed a sports timing system for alpine skiing particularly for training. Results are sent to an...

    Started by hcglitte‎, 04-07-2015 02:27 PM
    • Replies: 0
    • Views: 1,084
    04-07-2015, 02:27 PM Go to last post
  51. Sample Size- number of additional participants required!

    Hello! im currently running an experiment and my supervisor has asked me to calculate the number of additional participants i need to recruit in...

    Started by capobl‎, 04-07-2015 08:57 AM
    • Replies: 2
    • Views: 1,336
    04-07-2015, 09:17 AM Go to last post
  52. Simple Question

    Hi, I'm learning basic linear regression and I have a question about model building. I was told that if a model contains higher-order terms...

    Started by basicstatsquestion‎, 04-06-2015 12:41 PM
    • Replies: 3
    • Views: 1,583
    04-06-2015, 09:42 PM Go to last post
  53. 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
  54. Help with which test to use? Basic question

    I have a big data set containing students, and each student has a grade for 3 different subjects (writing, reading, and mathematics), and I need to...

    Started by raiken‎, 04-03-2015 01:54 PM
    • Replies: 2
    • Views: 1,933
    04-03-2015, 05:46 PM Go to last post
  55. Inference, estimator of moments

    If X_1,..,X_n is a random sample with density f(x;\theta)=e^{-(x-\theta)}e^{-e^{(x-\theta)}} x \in\mathbb{R} and -\infty<\theta<\infty i) Find the...

    Started by askazy‎, 04-03-2015 03:42 PM
    • Replies: 1
    • Views: 1,211
    04-03-2015, 03:54 PM Go to last post
  56. Customer Segmentation

    Hi all, Just wondering what approaches you can take when analysing customer data where you cannot determine whether a customer is active or...

    Started by LetItRide‎, 04-03-2015 11:27 AM
    • Replies: 1
    • Views: 974
    04-03-2015, 03:54 PM Go to last post
  57. Bayes estimator 2

    If X ~ Poisson(\theta) and \pi(\theta)~exp(1)(prior). Find the Bayes estimator for P_\theta(X=0) with respect to quadratic loss I calculated the...

    Started by askazy‎, 03-31-2015 12:21 PM
    • Replies: 9
    • Views: 1,846
    04-03-2015, 09:42 AM Go to last post
  58. Choosing the right level of measurement

    Hi, I have kind of a specific question relating to levels of measurement. First of all, my task is to choose the right measure of association for...

    Started by dadmaster‎, 04-03-2015 12:50 AM
    • Replies: 1
    • Views: 1,233
    04-03-2015, 09:25 AM Go to last post
  59. Stats Project - Navigating and using Stata.

    I am currently attempting a statistics project, using stata, my dataset has four variables and I have the following brief. The data can be seen...

    Started by JamesBarnett‎, 04-03-2015 07:04 AM
    • Replies: 0
    • Views: 2,180
    04-03-2015, 07:04 AM Go to last post
  60. Projecting Future Values using historical

    Hi all. I'm sure this has come up before - but, I was looking for a little help. I'm trying to put together a financial model that uses...

    Started by mamcamhtm123‎, 04-01-2015 09:08 PM
    • Replies: 1
    • Views: 3,045
    04-02-2015, 08:53 PM Go to last post

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