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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: 197,080
    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: 66,915
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,947
    04-03-2015, 05:46 PM Go to last post
  2. 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: 1,224
    04-03-2015, 03:54 PM Go to last post
  3. 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: 983
    04-03-2015, 03:54 PM Go to last post
  4. 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: 1,852
    04-03-2015, 09:42 AM Go to last post
  5. 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: 1,245
    04-03-2015, 09:25 AM Go to last post
  6. 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: 2,209
    04-03-2015, 07:04 AM Go to last post
  7. 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: 3,060
    04-02-2015, 08:53 PM Go to last post
  8. Removing Seasonality from data

    Hi, How can I remove seasonality from data, e.g. weekly sales data? I've used proc expand but is there a better way to do it? Thanks!

    Started by SGhosh‎, 04-02-2015 02:56 PM
    • Replies: 1
    • Views: 1,372
    04-02-2015, 05:02 PM Go to last post
  9. Estimating error

    I have reports based on long GPS occupations of the same site, which returns X Y and Z coordinates as well as the SD for each. I want the most...

    Started by mtanis17‎, 04-02-2015 12:55 PM
    • Replies: 0
    • Views: 746
    04-02-2015, 12:55 PM Go to last post
  10. Bayes estimator 3

    If X_1,..,X_n is a random sample of distribution f(x|\theta)=(\frac{\theta}{2})^{|x|} (1-\theta)^{1-|x|} I_{(-1,0,1)}(x) and the prior is Beta(1,1)...

    Started by askazy‎, 04-02-2015 12:41 PM
    • Replies: 0
    • Views: 925
    04-02-2015, 12:41 PM Go to last post
  11. Ordinal dependent variable - regression help!

    First of all, I am a complete newbie to stats from a non mathematical background, but I need to analyse survey data for my dissertation! So I have...

    Started by demwill‎, 04-02-2015 12:25 PM
    likert items, logistic regression, ordinal, ordinal regression
    • Replies: 0
    • Views: 939
    04-02-2015, 12:25 PM Go to last post
  12. SPSS help

    Hi, I just have a few quick questions. Statistics is not my best subject...at all, and I could REALLY use the help. I am currently in Research...

    Started by Katyjw6‎, 04-01-2015 01:28 AM
    dependent variable, independent variable, spss, statistics
    • Replies: 3
    • Views: 1,144
    04-01-2015, 09:16 PM Go to last post
  13. Measures of randomness

    Does anyone have any ideas on how to quantify randomness? More, specifically, I need a measure of clustering. Let's say I have 2 groups within a...

    Started by 8chocinco‎, 04-01-2015 03:09 PM
    • Replies: 3
    • Views: 1,884
    04-01-2015, 08:36 PM Go to last post
  14. Thumbs up which statistical test?

    hi everyone. I'm trying to find the test to see if there is a significant relationship between one group of students' language proficiency and four...

    Started by bzol‎, 04-01-2015 10:41 AM
    • Replies: 2
    • Views: 1,176
    04-01-2015, 04:44 PM Go to last post
  15. Assistance with best choice of ANOVA test

    Hi all, I was hoping to get some pointers around whether the ANOVA test I am using is appropriate, and if not how should I go about it. I want...

    Started by drewsta‎, 04-01-2015 08:40 AM
    • Replies: 4
    • Views: 1,195
    04-01-2015, 10:18 AM Go to last post
  16. Which methods are useful for this data ?

    We are taught correlation, regression, ANOVA, t-test,CHI- square and z-test. Also the basics mean, median and mode. Can you help me by telling which...

    Started by noobreborn‎, 04-01-2015 10:08 AM
    • Replies: 0
    • Views: 870
    04-01-2015, 10:08 AM Go to last post
  17. Which test would be appropriate to test multiple variables?

    I have a data on users with 5 personality variables. The users had to pick a logo for three different projects (most likely, may be, least likely)....

    Started by fbagirov‎, 04-01-2015 09:51 AM
    anova, multivariate analysis, spss, t-test
    • Replies: 0
    • Views: 1,093
    04-01-2015, 09:51 AM Go to last post
  18. Help with choosing a model

    Hello, I apologize if I am posting in the incorrect place. If so, could someone please direct me or move this thread? Or if something similar...

    Started by Log33‎, 03-31-2015 04:22 AM
    • Replies: 5
    • Views: 1,692
    04-01-2015, 08:29 AM Go to last post
  19. Need help chosing the right statisic test?

    Hi, I'm new here, I posted on another forum but no one answered so I thought I would try here... There is depression scores from drug A, drug B...

    Started by Sienna‎, 04-01-2015 07:29 AM
    • Replies: 2
    • Views: 1,044
    04-01-2015, 08:11 AM Go to last post
  20. Bayesian inference, Bayes estimator

    Let X a single observation of distribution U~, where \theta is a random variable with density \pi(\theta)=\theta e^{-\theta},\theta >0 a)find a...

    Started by askazy‎, 03-30-2015 08:17 PM
    • Replies: 12
    • Views: 3,240
    03-31-2015, 05:02 PM Go to last post
  21. Question Research Help

    Hi I am working on a study and I need help in deciding what test to use. I am comparing two groups. Domestic violence (DV) being present versus No...

    Started by lilmocha9‎, 03-30-2015 10:43 PM
    research dissertation, research question, spss
    • Replies: 1
    • Views: 1,407
    03-31-2015, 03:03 AM Go to last post
  22. Best online resources for learning statistical analyses for biology/ecology?

    So, I'm currently in a master's program for ecology. I've taken the basic "Biostatistical Analysis" course which is offered here but I would like to...

    Started by srpang89‎, 03-30-2015 05:39 PM
    • Replies: 0
    • Views: 1,243
    03-30-2015, 05:39 PM Go to last post
  23. Range from standard deviation?

    Hi all, I'm a Clinical assistant Ophthalmologist doing an MMED with very rudimentary statistics knowledge. :confused: Is it possible to...

    Started by Mmhr‎, 03-30-2015 02:47 PM
    • Replies: 3
    • Views: 1,224
    03-30-2015, 03:43 PM Go to last post
  24. Panel data correlation

    In a panel dataset of multiple years and multiple countries, what is best practice for running correlations among variables? I know that pooling by...

    Started by Alexander8‎, 03-30-2015 09:26 AM
    correlation, panel data
    • Replies: 0
    • Views: 1,009
    03-30-2015, 09:26 AM Go to last post
  25. SigmaPlot

    Dear Sir and Madam, I am from Germany and I am using SigmaPlot. I would like to draw a graph and I am facing problems doing this. I would...

    Started by LisaRuby90‎, 03-29-2015 01:00 PM
    • Replies: 0
    • Views: 955
    03-29-2015, 01:00 PM Go to last post
  26. Post Best Statistical Test for Dichotomous Variables?

    Hi, I'm hoping someone can tell me what the best statistical test for this situation is: I'm trying to determine when individuals are exposed...

    Started by Xaibulier‎, 03-25-2015 02:14 PM
    • Replies: 2
    • Views: 1,407
    03-29-2015, 10:45 AM Go to last post
  27. Approximation of the variance of the standardized mean difference

    Hi, I'm trying to understand how the approximation of the variance of the standardized mean difference is derived: V_d = (n_c + n_t) / (n_c * n_t)...

    Started by SebastianG‎, 03-29-2015 09:50 AM
    • Replies: 0
    • Views: 1,100
    03-29-2015, 09:50 AM Go to last post
  28. Assumptions of ANOVA

    I would like to better understand why the same variance is for each group is an assumption in the ANOVA. Can anyone explain this? Further it is...

    Started by Tony123‎, 03-28-2015 09:22 AM
    • Replies: 4
    • Views: 1,467
    03-29-2015, 06:59 AM Go to last post
  29. A survey where participants circled at least one answer as the question asked

    I have surveys I am working on. One of the questions asks the participants to circle religious themes that appeals to them and also that they should...

    Started by jmuvekwa‎, 03-29-2015 01:00 AM
    data cleaning, data computing, econometrics, statistics
    • Replies: 0
    • Views: 1,394
    03-29-2015, 01:00 AM Go to last post
  30. Please help me interpret interaction terms (dummy*continuous) in OLS regression

    Dear all, I am having some conceptual difficulties in understanding and interpreting interaction terms (between a dummy and a continuous variable)...

    Started by anika13‎, 03-27-2015 10:45 PM
    • Replies: 2
    • Views: 2,308
    03-28-2015, 12:16 PM Go to last post
  31. Question Which statistical analysis to perform (Soil Science/Soil enzymology)

    Hello everyone, I tried to find through the forum to get some help and it was helpful to get some information but still have some confusion so I...

    Started by jalrox‎, 03-27-2015 11:06 PM
    biology, enzymes, microorganisms, soil
    • Replies: 2
    • Views: 1,044
    03-28-2015, 08:00 AM Go to last post
  32. Is this variable following a poisson distribution or a binomial distribution?

    You're at a bus stop watching people go by, not buses. Let X = number of people wearing headphones

    Started by Jfasken‎, 03-27-2015 08:23 PM
    binomial distribution, poisson distribution
    • Replies: 1
    • Views: 988
    03-28-2015, 05:35 AM Go to last post
  33. What does the ′ sign after a letter denote?

    The ′ sign is often seen in especially econometrics combined with some coefficient like a′ or P′ or etc. It may also be a term used in matrix math....

    Started by Tony123‎, 03-27-2015 06:25 AM
    • Replies: 5
    • Views: 4,085
    03-27-2015, 08:08 AM Go to last post
  34. An Income Statement deficit

    If I don't charge for any purchases, but I pay for everything during the year, why do I get a negative number (deficit) when I run an Income...

    Started by Lonewolf‎, 03-26-2015 06:39 PM
    income statement
    • Replies: 1
    • Views: 1,136
    03-26-2015, 09:39 PM Go to last post
  35. Chi Sqaure and odds ratio help

    Hi all, I was wondering - what's the relationship between chi square and odds ratio? To me it makes sense that these two values are fixed- i.e.,...

    Started by redsocks‎, 03-26-2015 12:50 AM
    chi square, odds ratio
    • Replies: 4
    • Views: 1,479
    03-26-2015, 04:58 PM Go to last post
  36. PhD Dissertation Help

    I was hoping that someone could give me advice. I'm currently in my second year of the dissertation process of my PhD. My committee chair has not...

    Started by Penny_BBT‎, 03-26-2015 04:43 PM
    dissertation, phd
    • Replies: 0
    • Views: 969
    03-26-2015, 04:43 PM Go to last post
  37. Just some homework help

    Hey all. I'm a high school student taking a stats class and could use some help because i can't seem to understand how to do this question without...

    Started by Grixis‎, 03-25-2015 06:59 PM
    margin of error
    • Replies: 1
    • Views: 1,728
    03-26-2015, 02:31 AM Go to last post
  38. Very basic question regarding multiplicity

    Hi all, I'm hoping you can give me some homework help so I can better understand this question. I was asked, given a 0.05 significance level, how...

    Started by alex3483‎, 03-25-2015 06:28 PM
    • Replies: 0
    • Views: 982
    03-25-2015, 06:28 PM Go to last post
  39. Talking Using Pearson correlations and/or t-test to determine "importance" of variables.

    Hi Internet, I'm a stats novice who is working on a data-heavy project at work (don't worry - my boss suggested I join a discussion forum so that...

    Started by Cody‎, 03-25-2015 03:35 PM
    • Replies: 0
    • Views: 986
    03-25-2015, 03:35 PM Go to last post
  40. Unusual Power and sample size problem with correlated data

    Is there a way to estimate ‘effective sample size’ based upon data acquired where a correlation quirk of the original data set violated the...

    Started by majerle85‎, 03-25-2015 01:51 PM
    power calculation, sample size calculation
    • Replies: 0
    • Views: 1,180
    03-25-2015, 01:51 PM Go to last post
  41. standard deviation of A/B

    Hello everyone, I'm trying to calculate a new variable C = A/B out of the variables A and B. I know mean and standard deviation from A and B and I...

    Started by essence‎, 02-12-2015 09:43 AM
    • Replies: 1
    • Views: 1,631
    03-25-2015, 08:32 AM Go to last post
  42. Sample size during error propagation calculation

    Hi, I have several questions regarding the calculation of error propagation. Assuming I have a group of 'A' data with mean =0.852361, sd=0.388232...

    Started by wz1416‎, 03-23-2015 11:32 PM
    error propagation, sample size
    • Replies: 1
    • Views: 1,745
    03-24-2015, 06:47 PM Go to last post
  43. using odds ratio for correlation

    Hi, we are working on a study using findings from 13 different countries on relation of substance use on suicide ideation and attempt. We...

    Started by aliriza.arenliu‎, 03-24-2015 06:46 AM
    • Replies: 1
    • Views: 1,474
    03-24-2015, 08:26 AM Go to last post
  44. Subtracting the slope from the intercept?

    Hi all, I was wondering, in a standardised regression equation, what does it mean if the regression equation signifies a - b, instead of a+b? ...

    Started by redsocks‎, 03-23-2015 03:23 AM
    • Replies: 4
    • Views: 1,765
    03-24-2015, 03:47 AM Go to last post
  45. help me solve these problems

    I have two problem, please help, 1/ In a study of flight attendants, salaries paid by two different airlines were randomly selected. For 41...

    Started by anthonyalex‎, 03-24-2015 01:00 AM
    • Replies: 1
    • Views: 2,662
    03-24-2015, 03:41 AM Go to last post
  46. hypothesis

    Hi all, I have homework like this, it hard to me, please help 1/ Random samples of 1600 workers in Region 1 and 1400 workers in Region 2 have been...

    Started by anthonyalex‎, 03-23-2015 03:05 AM
    • Replies: 2
    • Views: 2,350
    03-24-2015, 12:56 AM Go to last post
  47. p value relationship to standard error as samples increase?

    Hi all, I would appreciate some help regarding the relationship between the p value and some other elements in my question below. Any help would...

    Started by redsocks‎, 03-23-2015 05:04 AM
    p value, sample size increase, standard error
    • Replies: 2
    • Views: 964
    03-23-2015, 10:02 PM Go to last post
  48. Determining asset value using historical stats

    Hey guys, nice to meet you all! My name is Jonathan and I'm from Queensland Australia. I'm currently working on a project which is seeking to find...

    Started by jcbn82‎, 03-23-2015 09:38 PM
    • Replies: 0
    • Views: 827
    03-23-2015, 09:38 PM Go to last post
  49. Stats project - statistical tests

    Good afternoon everybody! I was just wondering if someone could offer advice on a stats project I am working on. It is for a foundation math...

    Started by chellie‎, 03-23-2015 10:38 AM
    • Replies: 2
    • Views: 1,123
    03-23-2015, 12:43 PM Go to last post
  50. Smile Pearson's correlation and change score

    Hi, For my final year project I conducted a study measuring performance of emotion recognition at three points: before, mid and after. One of my...

    Started by stell93‎, 03-22-2015 05:54 PM
    • Replies: 1
    • Views: 1,176
    03-23-2015, 06:00 AM Go to last post
  51. outliers in calulation of central tedency

    I am dealing with some sort of scientific data having two extreme values (outliers) total no of obs is 100,values are below 10 but two are 80 and...

    Started by sara b‎, 03-21-2015 09:13 AM
    • Replies: 2
    • Views: 1,060
    03-22-2015, 01:59 PM Go to last post
  52. How to calculate the minimum x for histogram bins values

    Let say that I want to construct an histogram for 100 continuous values with 5 bins of equal interval How do I select the minimum value for the...

    Started by aviben‎, 03-22-2015 11:08 AM
    bins, histogram
    • Replies: 0
    • Views: 931
    03-22-2015, 11:08 AM Go to last post
  53. Probability and Combinations

    Hi everyone. Could you please help me understand this, I'm very confused about this. Question: What's the probability of drawing exactly 2 aces in...

    Started by stan_stan2‎, 03-22-2015 08:28 AM
    • Replies: 2
    • Views: 1,506
    03-22-2015, 10:54 AM Go to last post
  54. Help desperately needed. Thank you.

    hi all, I have been struggling to understand what statistical test to use. I have been approaching it by understanding what dependent and...

    Started by Vodada‎, 03-21-2015 01:17 AM
    • Replies: 3
    • Views: 1,496
    03-21-2015, 11:08 AM Go to last post
  55. Groups in a variable are largely unequal in size

    Hi, I want to run an analysis on a data set. However, the primary predictor variable (5 point scale) varies greatly in size of each group. I plan...

    Started by Marylukaj‎, 09-28-2014 07:01 PM
    dichotomous variable, regression, sample size
    • Replies: 1
    • Views: 1,441
    03-21-2015, 04:08 AM Go to last post
  56. Comparing animal abundance to percent cover of substrate?

    Hey guys, So I'm interested in looking at how animal abundance varies between two different types of substrate. The animal abundance is in density...

    Started by srpang89‎, 03-19-2015 08:42 PM
    • Replies: 2
    • Views: 1,406
    03-20-2015, 08:09 PM Go to last post
  57. Estimator 2

    If X_1,X_2,....,X_n is a random sample with density f(x;\theta)=\frac{1}{2\theta}I_{(-\theta,\theta)}(x),\theta>0 . Find the maximum likelihood...

    Started by askazy‎, 03-19-2015 02:40 PM
    • Replies: 3
    • Views: 1,176
    03-20-2015, 05:36 PM Go to last post
  58. Mixed ANOVA withinXbetween interaction not significant, interpret simple effects?

    Hi Experts, I have conducted a 2 (time: before, after) x 3 (condition 1 2 3) mixed ANOVA. The within X between interaction is only marginally...

    Started by oarnold‎, 02-17-2015 08:57 PM
    interaction, mixed anova, simple effects
    • Replies: 1
    • Views: 1,028
    03-20-2015, 01:01 PM Go to last post
  59. 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: 1,061
    03-20-2015, 09:19 AM Go to last post
  60. Same Constants when adding more dependent variables.

    Hi guys, First time poster here. I am working on my dissertation and I came up with some odd, although interesting, results. There are two...

    Started by emilpuiu1‎, 03-18-2015 07:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 2,418
    03-20-2015, 05:33 AM Go to last post

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