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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: 197,262
    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: 67,029
    09-30-2005, 09:44 AM Go to last post
  1. Question A few questions from a sample final that have my mind boggled.

    As many of you know, it's finals time at many schools around the nation. I am currently enrolled in a Stats class, and it has to be one of the most...

    Started by baubry‎, 12-11-2012 01:50 PM
    • Replies: 0
    • Views: 2,170
    12-11-2012, 01:50 PM Go to last post
  2. Question 3^2 factorial design, just one treatment with replicas, help?

    Hello al! I would appreciate if you could help me, I have this experiment with two factors, every factor with 3 levels, so in total there are 9...

    Started by garcia.saul‎, 12-11-2012 08:25 AM
    • Replies: 0
    • Views: 827
    12-11-2012, 08:25 AM Go to last post
  3. Strongly unbalanced small sample size BUT significant difference....???

    Hi all, A colleague had conducted a two sample t-tests assuming unequal variances with samples of size 22 and 7 (the data is really hard to...

    Started by DeanP‎, 12-10-2012 02:50 AM
    • Replies: 4
    • Views: 2,325
    12-11-2012, 07:44 AM Go to last post
  4. repeated measure with unequal repeats for each subject

    We want to do a repeated measure study. we have some patients who Swallow a kind of Tablet for their disease. We call this times tg-on But if their...

    Started by fatemeh91‎, 12-11-2012 07:32 AM
    • Replies: 0
    • Views: 981
    12-11-2012, 07:32 AM Go to last post
  5. Linear Regression

    Problem: Let W & Q be two random variables such that E=5, sd(W)=1 E=10, sd(Q)=2 rho=0.2 Assume that the joint distribution of (W,Q) is...

    Started by format1998‎, 12-11-2012 02:01 AM
    • Replies: 0
    • Views: 1,357
    12-11-2012, 02:01 AM Go to last post
  6. Independent Binomial random variables, MLE of px and py

    Let X and Y be independent Binomial random where X~B(Nx, px) and Y~B(Ny,py), where Nx and Ny are known and px and py are unknown. (a) Suppose...

    Started by sexykitten69‎, 12-09-2012 08:55 PM
    • Replies: 14
    • Views: 2,479
    12-10-2012, 10:28 PM Go to last post
  7. Series - Variations between 2 dates

    Dear All, I’ m trying to solve the following problem: Date 1. Y= (A+B+C)/(D+E+F) Date 2. Y= (A+B+C)/(D+E+F) How can I perform an...

    Started by lullabystreet‎, 12-10-2012 07:00 PM
    • Replies: 0
    • Views: 699
    12-10-2012, 07:00 PM Go to last post
  8. Offset variable in GWPR

    Hi, I am using a Geographically Weighted Poisson Regression (GWPR) but having issues selecting the the offset variable. I am exploring the...

    Started by lau86‎, 12-10-2012 04:14 PM
    • Replies: 0
    • Views: 872
    12-10-2012, 04:14 PM Go to last post
  9. Simple experiment...but confused about analysis...

    For a class, we had to create a simple completely randomized experiment to investigate some topic. We chose to see if caffeine actually makes people...

    Started by michiganitis‎, 12-10-2012 11:20 AM
    • Replies: 5
    • Views: 1,573
    12-10-2012, 02:53 PM Go to last post
  10. Risk Factors in a Clinical Trial

    The study is confidential right now. So I cannot go into the details. But will try to detail every necessary information, in the hope that can get...

    Started by victorxstc‎, 12-09-2012 03:19 PM
    ancova
    • Replies: 6
    • Views: 1,931
    12-10-2012, 11:12 AM Go to last post
  11. Mean Reversion

    I have been given a Geometric Brownian Motion, with parameters \mu_{*} and \sigma ^{2}_{*}, meaning i can write; d S_{t} = \mu_{*} S_{t} dt +...

    Started by MCoolta‎, 12-10-2012 06:11 AM
    • Replies: 1
    • Views: 1,142
    12-10-2012, 08:01 AM Go to last post
  12. conjoint analysis

    hello my dear friends i do conjoint analysis in my thesis for underestanding consumer preferences in purchasing machinery carpet with spss. i...

    Started by samira‎, 12-10-2012 07:56 AM
    • Replies: 0
    • Views: 1,287
    12-10-2012, 07:56 AM Go to last post
  13. Name that scenario

    Name that Scenario: I need help choosing the analysis technique most appropriate for each question. THANKS! A: Survey of 1000 people in a large...

    Started by lala88‎, 12-10-2012 01:05 AM
    • Replies: 1
    • Views: 4,770
    12-10-2012, 01:07 AM Go to last post
  14. Smile Logistic regression or GLM?

    Hi everyone: I have a question about using logistic regression or GLM with only categorical variables as independent variables. The dependent...

    Started by yamaneko‎, 12-03-2012 12:41 AM
    binary data, categorical variables, glm, logistic regression
    • Replies: 6
    • Views: 2,229
    12-09-2012, 11:09 PM Go to last post
  15. T test versus Z test

    Hi, I have a pretty basic question 9but havne't been able to find the answer through the search function). Basically, I want to know why in...

    Started by chiccaboom‎, 12-06-2012 07:57 PM
    • Replies: 2
    • Views: 4,101
    12-09-2012, 10:30 PM Go to last post
  16. This is not homework! It is a binomial distribuitoin question on the study guide.

    At a recent faculty party there were 8 philosophers, 5 psychologists, and 6 physicists, all noted for their love of the (fermented) grape (and...

    Started by HannahB‎, 12-09-2012 10:27 PM
    • Replies: 0
    • Views: 2,475
    12-09-2012, 10:27 PM Go to last post
  17. unbiased estimator for 1/p of geometric distribution

    Suppose X is a random variable with geometric distribution, and parameter p, 0<p<1, how do you find a statistc that is unbiased estimator of 1/p? Do...

    Started by colstat‎, 11-16-2010 11:55 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 19,308
    12-09-2012, 10:11 PM Go to last post
  18. Post One way ANOVA or repeated measures one way ANOVA??

    My study is looking at six different drug delivery devices. So, there will be six groups with 15 animals in each. The study is going to last 100 days...

    Started by ses10‎, 12-09-2012 05:13 PM
    • Replies: 1
    • Views: 1,406
    12-09-2012, 09:51 PM Go to last post
  19. Normal Distribution

    The daily dinner bills in a local restaurant are normally distributed with a mean of $28 and a standard deviation of $6. a. What is the...

    Started by catman9786‎, 12-09-2012 05:11 PM
    • Replies: 1
    • Views: 3,435
    12-09-2012, 05:15 PM Go to last post
  20. type 1, type 2 error question

    The latest in the “You may be a redneck if . . . ” genre has produced a simple questionnaire. If more than 80% of the questions are answered in...

    Started by moe6142‎, 12-09-2012 03:32 PM
    • Replies: 1
    • Views: 1,496
    12-09-2012, 04:24 PM Go to last post
  21. z-test question

    please delete this thread for me

    Started by moe6142‎, 12-09-2012 03:30 PM
    • Replies: 0
    • Views: 1,019
    12-09-2012, 03:30 PM Go to last post
  22. Question Interpretation of a Q-Q plot and Shapiro-Wilk test

    I have the following output from a shapiro-wilk test: Shapiro-Wilk normality test data: goalTime W = 0.9486, p-value = 0.05751 And the Q-Q plot...

    Started by truetaurus‎, 12-09-2012 06:18 AM
    mathematics, normal-distribution, r-programming, statistics
    • Replies: 3
    • Views: 8,372
    12-09-2012, 10:06 AM Go to last post
  23. High covariance between two factors. Is that a problem in a regression?

    Hi, Is it problematic if there is a very high covariance between two factors (independent latent variables) (0.95 standardized). I thought the...

    Started by fazzmo‎, 12-08-2012 12:29 PM
    covariance, factor analysis, regression
    • Replies: 3
    • Views: 2,902
    12-09-2012, 06:58 AM Go to last post
  24. Question Causal stats with one event and multiple time series?

    Hi all, I have computed causal relationships between two time series. But now I would also like to check the causal influence of a single event on...

    Started by Psynch‎, 12-08-2012 10:54 PM
    causality, time series
    • Replies: 0
    • Views: 1,047
    12-08-2012, 10:54 PM Go to last post
  25. Referent Group

    Hello, I have a question about the reference group for one of my variables. Say I have “insurance” as a categorical variable, with 4 levels:...

    Started by Jainie‎, 12-08-2012 11:01 AM
    • Replies: 5
    • Views: 1,981
    12-08-2012, 12:19 PM Go to last post
  26. SPSS T-Test results interpretation

    Hey guys! :) I'm fairly new to all these statistics things and am currently doing an assignment for university and i am really struggling to...

    Started by Steve3591‎, 12-08-2012 10:55 AM
    • Replies: 2
    • Views: 2,064
    12-08-2012, 12:03 PM Go to last post
  27. Statistical analysis of Profits - use of U-test

    Hi We have been working on a project where we have 2 or more trading agents on a market stock and for the outcome we have the profits that each...

    Started by ozamarripa‎, 12-07-2012 01:37 PM
    confidence interval, profits, statistical analysis, u-test
    • Replies: 7
    • Views: 2,041
    12-08-2012, 03:12 AM Go to last post
  28. the difference between non-stationary data and random data?

    what are the the difference between non-stationary data and random data? If we detrend a stationary data and make it non-stationary what will happen,...

    Started by Fred_a‎, 12-07-2012 05:44 PM
    random, stationarity, trend, trend analysis
    • Replies: 1
    • Views: 2,205
    12-08-2012, 12:11 AM Go to last post
  29. Finding troughs in a time series data

    Hi, I have a time series data that looks like below (T1, T2, etc indicate linear time intervals):...

    Started by earlyBird‎, 11-25-2012 04:51 AM
    • Replies: 1
    • Views: 1,047
    12-07-2012, 02:45 PM Go to last post
  30. Regression Coefficient Help

    Hello, Thanks in advance for the help everyone, I'm new to this site and I really appreciate it. I am currently working on some research and...

    Started by husky‎, 12-07-2012 06:14 AM
    analysis help, coefficient, regression
    • Replies: 10
    • Views: 2,225
    12-07-2012, 01:40 PM Go to last post
  31. Estimate of σ^2 (variance of Y in regression)

    Hello, everyone, I have a question about the regression. The textbook said, the mean-square regression term (SSY-SSE) provides an estimate of σ^2...

    Started by eugllena‎, 12-07-2012 11:12 AM
    • Replies: 0
    • Views: 36,137
    12-07-2012, 11:12 AM Go to last post
  32. correspondence between confidence interval or hypothesis testing

    If the confidence intervals for two proportions do overlap this does not necessarily mean that the statistical test for the difference will be...

    Started by jojasamo‎, 12-07-2012 03:38 AM
    • Replies: 3
    • Views: 2,728
    12-07-2012, 06:06 AM Go to last post
  33. Chi test and regression

    Hello everybody I have to test whether there is a significant difference between two groups. I want to indicate that among the two groups are no...

    Started by Oli‎, 07-24-2012 01:10 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,388
    12-07-2012, 03:23 AM Go to last post
  34. What statistical test would I use for this?

    I was thinking of a chi square to assess this situation. What does everyone think? In centres with an active mental health program a higher...

    Started by chiccaboom‎, 12-07-2012 12:00 AM
    • Replies: 0
    • Views: 1,597
    12-07-2012, 12:00 AM Go to last post
  35. Determining sample dependence

    How do you determine if samples are independent? I know that test scores of two separate groups of students are independent. Before-and-after...

    Started by alphacheese‎, 12-06-2012 11:25 PM
    • Replies: 1
    • Views: 1,236
    12-06-2012, 11:38 PM Go to last post
  36. How to study for a statistics exam ?

    I have just completed my first ever statistics paper and passed...but not to my satisfaction (really wanted to do better :mad:) I have taken on...

    Started by urbano‎, 12-06-2012 10:21 PM
    • Replies: 1
    • Views: 2,816
    12-06-2012, 10:50 PM Go to last post
  37. Binomial Distribution

    Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what...

    Started by HannahB‎, 12-03-2012 06:42 PM
    • Replies: 3
    • Views: 1,299
    12-06-2012, 10:04 PM Go to last post
  38. Null Hypothesis help

    Hi would love some help on this, stats is all new to me. Question is Test the null hypothesis that the true mean yield if 5000kg (alpha = 0.05) I...

    Started by Buddy2354‎, 12-06-2012 05:01 PM
    • Replies: 2
    • Views: 1,287
    12-06-2012, 07:50 PM Go to last post
  39. How to check association between an interval variable & nominal variable?

    There is a collection of data of 2000 patients. I want to know the age of onset of Diabetes (an interval variable) has any relationship to the...

    Started by buddhika‎, 03-15-2012 04:35 PM
    interval data, nominal data, significance test
    • Replies: 9
    • Views: 7,352
    12-06-2012, 07:30 PM Go to last post
  40. Longitudinal Data Analysis- Best analysis for given data

    Greetings, I am conducting a study with 80 companies and looking at aggregated perceptions of employees for the DV (continuous variable). The IV...

    Started by Rasp0707‎, 12-06-2012 06:27 PM
    • Replies: 1
    • Views: 1,063
    12-06-2012, 06:55 PM Go to last post
  41. Is there an ANOVA equivalent of a paired t test?

    Hello, I am trying to analyse the results of subjects before and after a treatment. There are three treatments, and each subject is subjected to...

    Started by bryallen‎, 12-05-2012 07:14 PM
    • Replies: 3
    • Views: 5,374
    12-06-2012, 06:23 PM Go to last post
  42. How to analyse the following matched data?

    Hi all, I have a question that needs analysing that looks like this: 1) There is a pre and post intervention response (two separate surveys) to...

    Started by studio‎, 12-06-2012 02:44 AM
    spss
    • Replies: 2
    • Views: 1,503
    12-06-2012, 06:00 PM Go to last post
  43. Estimation model for White noise process

    Hi !!! I have a question about time series (again :p). I want to analyze the correlation between two series. I ran some tests and it appears that...

    Started by Freymann‎, 08-03-2012 08:46 AM
    • Replies: 5
    • Views: 1,819
    12-06-2012, 04:40 PM Go to last post
  44. Calculating class rank based on distribution of individual grades

    Hi I am trying to calculate my class rank, which my school does not provide. I have searched extensively on Google and on this forum, without...

    Started by tuolumne‎, 12-06-2012 03:20 PM
    • Replies: 0
    • Views: 2,186
    12-06-2012, 03:20 PM Go to last post
  45. Convert to Reandom Variables- Time Series Analysis

    Hi, I have a set of water quality data that are not random but I want use them in a Copula model so I should have random variables (I know it can...

    Started by Fred_a‎, 12-06-2012 02:40 PM
    copula, random variables, time series
    • Replies: 5
    • Views: 1,537
    12-06-2012, 03:03 PM Go to last post
  46. Modeling my data, will ANOVA suffice?

    Helly everyone, I have 12 animals, divided in three groups (all n=4). Group A received two treatment doses (0.8 followed by 1.6), group B received...

    Started by rweenink‎, 12-06-2012 11:34 AM
    • Replies: 0
    • Views: 978
    12-06-2012, 11:34 AM Go to last post
  47. Sampling from N data points based on a given probability distribution

    I have N data points, and each data points is associated with a probability. The sum of the N probabilities equals to one. I need to sample these N...

    Started by winecoding‎, 12-05-2012 10:56 PM
    probability distribution, sampling
    • Replies: 1
    • Views: 1,657
    12-06-2012, 03:26 AM Go to last post
  48. Help needed with cotton experiment

    Hello all! First time visitor/poster. . . I am needing your help with determining the statistical significance of a cotton variety trial that I...

    Started by bryan‎, 12-04-2012 06:16 PM
    • Replies: 11
    • Views: 1,548
    12-06-2012, 02:20 AM Go to last post
  49. Wink Graduate Health Care Student would appreciate a little input Please...

    I apologize for this rude intrusion into your evening. I had statistics as an undergrad 25 years ago I had statistics with Dr. Zellacof (taught at...

    Started by Lislj‎, 12-05-2012 09:43 PM
    • Replies: 0
    • Views: 1,236
    12-05-2012, 09:43 PM Go to last post
  50. Question Significance test for percentages

    Hi everyone I need to compare percentage composition of different groups and determine if groups significantly differ. Example: Election...

    Started by GeB‎, 12-04-2012 04:04 PM
    • Replies: 8
    • Views: 4,021
    12-05-2012, 05:22 PM Go to last post
  51. Question Help Choosing Tests

    Hello All, I'm currently writing my dissertation proposal, and I'm a bit confused on the statistics. For my research, I'm looking at two groups...

    Started by ptork66‎, 12-05-2012 02:48 PM
    • Replies: 2
    • Views: 1,406
    12-05-2012, 04:15 PM Go to last post
  52. Question Am I correct to use a t-test?

    I'm trying to plan a research paper, but I have no experience with statistics and would appreciate advice as to the kind of test i should be using....

    Started by douglaskiddie‎, 12-05-2012 03:15 PM
    • Replies: 1
    • Views: 1,666
    12-05-2012, 03:53 PM Go to last post
  53. Hypothesis Testing and Box Plots

    Hi there, Recently I was doing an assesment and I noticed a very small part of a question that i was doing which I had in the past glimpsed over....

    Started by hughdini‎, 12-05-2012 11:24 AM
    • Replies: 1
    • Views: 2,583
    12-05-2012, 02:18 PM Go to last post
  54. chi square test of randomness

    hi say i have a spatial distribution of frequency count for 9 categories like this 3, 4, 9 4, 1, 3 2, 6, 5 How do i test whether this...

    Started by kurumi‎, 12-05-2012 03:16 AM
    • Replies: 5
    • Views: 4,531
    12-05-2012, 06:36 AM Go to last post
  55. Profile analysis vs MANOVA

    Hi everyone! I am quite new here so if I hope that my question will make sense: I can't understand why should I use profile analysis instead of...

    Started by fri88‎, 12-05-2012 05:02 AM
    • Replies: 0
    • Views: 1,542
    12-05-2012, 05:02 AM Go to last post
  56. Correlation test with multiple X values for every Y value

    Hi all, For a university project, I want to run a correlation test between some variables to test some hypotheses. The real domain is a bit...

    Started by stevejones‎, 12-05-2012 01:59 AM
    • Replies: 0
    • Views: 1,610
    12-05-2012, 01:59 AM Go to last post
  57. Chance of making 50% of the profit

    Ok, Just a basic question (numbers are random). If my profit is $150 and standard deviation is $20. What is the chance of making 50% of the expected...

    Started by fomenter‎, 12-04-2012 02:08 PM
    • Replies: 0
    • Views: 1,234
    12-04-2012, 02:08 PM Go to last post
  58. two way analysis

    I have data for 1970 and 1980 parity ratios, Parity 0 1 2 3 4 5 British 0.879 0.797 0.558 0.484 0.480 0.531...

    Started by Snowy88‎, 12-03-2012 10:14 AM
    homework
    • Replies: 2
    • Views: 1,890
    12-04-2012, 01:47 PM Go to last post
  59. Exogenous Regime Switching

    I currently have a model that measures inflation expectations as follows: y(t) = a*x(t) + (1-a)*y(t-1) I'm looking to create a regime switching...

    Started by Esses51‎, 12-04-2012 09:30 AM
    economics, regime switching, threshold
    • Replies: 0
    • Views: 1,058
    12-04-2012, 09:30 AM Go to last post
  60. Data Hygience

    I get government data from time to time, and some of the fields that I expect to only contain numerical data also contain text explaining why the...

    Started by SmoothJohn‎, 12-03-2012 01:16 PM
    • Replies: 6
    • Views: 1,771
    12-04-2012, 12:34 AM Go to last post

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