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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 11:13 AM
    • Replies: 1
    • Views: 93,729
    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: 28,602
    09-30-2005, 09:44 AM Go to last post
  1. 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, Yesterday 11:11 PM
    • Replies: 0
    • Views: 36
    Yesterday, 11:11 PM Go to last post
  2. 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, Yesterday 08:57 PM
    • Replies: 2
    • Views: 46
    Yesterday, 09:40 PM Go to last post
  3. Z Score

    Calculate the z-score to determine the probability that the stock price for Firm A will fall below a penny (i.e., $0.01). Firm A mean of 1.58 with a...

    Started by Trident_15‎, 03-05-2015 10:56 AM
    • Replies: 5
    • Views: 252
    Yesterday, 09:00 AM Go to last post
  4. 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, Yesterday 01:27 AM
    confidence interval, mean difference, negative values
    • Replies: 1
    • Views: 85
    Yesterday, 07:57 AM Go to last post
  5. 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, Yesterday 04:44 AM
    • Replies: 0
    • Views: 75
    Yesterday, 04:44 AM Go to last post
  6. 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...

    Started by LtStarbuck‎, 04-14-2015 08:40 AM
    • Replies: 13
    • Views: 272
    Yesterday, 03:38 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, Yesterday 01:18 AM
    two-sided test
    • Replies: 0
    • Views: 72
    Yesterday, 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, Yesterday 01:12 AM
    confidence interval, population mean, t-test
    • Replies: 0
    • Views: 41
    Yesterday, 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: 91
    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: 104
    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: 99
    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: 121
    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: 63
    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: 52
    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: 55
    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: 90
    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: 118
    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: 58
    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: 103
    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: 81
    04-15-2015, 03:21 PM Go to last post
  21. Correlation conundrum

    Hi there, New to this forum, sought it out because I am having real trouble understanding what is going on with this weird correlation I am...

    Started by PsyD_Student‎, 04-14-2015 09:21 AM
    correlations, merged data, wtf
    • Replies: 3
    • Views: 121
    04-15-2015, 06:44 AM Go to last post
  22. 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: 82
    04-15-2015, 02:21 AM Go to last post
  23. 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: 57
    04-15-2015, 02:00 AM Go to last post
  24. 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: 88
    04-14-2015, 02:30 PM Go to last post
  25. 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: 78
    04-14-2015, 10:03 AM Go to last post
  26. 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: 94
    04-14-2015, 03:27 AM Go to last post
  27. 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: 223
    04-13-2015, 01:54 PM Go to last post
  28. 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: 210
    04-13-2015, 01:15 PM Go to last post
  29. 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: 229
    04-13-2015, 07:06 AM Go to last post
  30. 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: 178
    04-13-2015, 05:32 AM Go to last post
  31. 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: 241
    04-13-2015, 03:06 AM Go to last post
  32. 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: 142
    04-12-2015, 02:32 PM Go to last post
  33. 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: 204
    04-12-2015, 02:24 PM Go to last post
  34. 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: 116
    04-12-2015, 02:14 PM Go to last post
  35. 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: 158
    04-12-2015, 11:37 AM Go to last post
  36. 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: 174
    04-11-2015, 08:37 PM Go to last post
  37. 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: 100
    04-11-2015, 06:01 PM Go to last post
  38. 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: 174
    04-11-2015, 11:28 AM Go to last post
  39. 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: 173
    04-11-2015, 07:56 AM Go to last post
  40. 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: 126
    04-11-2015, 02:01 AM Go to last post
  41. 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: 104
    04-10-2015, 06:52 PM Go to last post
  42. 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: 195
    04-10-2015, 05:39 PM Go to last post
  43. 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: 168
    04-10-2015, 03:38 AM Go to last post
  44. 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: 143
    04-09-2015, 03:34 PM Go to last post
  45. 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: 197
    04-08-2015, 06:27 PM Go to last post
  46. 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: 144
    04-08-2015, 03:01 PM Go to last post
  47. 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: 100
    04-08-2015, 01:58 PM Go to last post
  48. 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: 137
    04-08-2015, 08:07 AM Go to last post
  49. 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: 261
    04-08-2015, 07:42 AM Go to last post
  50. 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: 157
    04-07-2015, 04:34 PM Go to last post
  51. 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: 138
    04-07-2015, 02:27 PM Go to last post
  52. 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: 167
    04-07-2015, 09:17 AM Go to last post
  53. 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: 184
    04-06-2015, 09:42 PM Go to last post
  54. 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
    bonferroni
    • Replies: 0
    • Views: 192
    04-03-2015, 07:50 PM Go to last post
  55. 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: 217
    04-03-2015, 05:46 PM Go to last post
  56. 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: 166
    04-03-2015, 03:54 PM Go to last post
  57. 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: 152
    04-03-2015, 03:54 PM Go to last post
  58. 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: 304
    04-03-2015, 09:42 AM Go to last post
  59. 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: 145
    04-03-2015, 09:25 AM Go to last post
  60. 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: 184
    04-03-2015, 07:04 AM Go to last post

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