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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: 91,214
    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: 28,312
    09-30-2005, 09:44 AM Go to last post
  1. 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, Yesterday 10:43 PM
    research dissertation, research question, spss
    • Replies: 1
    • Views: 52
    Today, 03:03 AM Go to last post
  2. 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, Yesterday 08:17 PM
    • Replies: 0
    • Views: 48
    Yesterday, 08:17 PM Go to last post
  3. Removing outliers - endless story?

    I've been collecting some data for the first time, investigating differences between three groups of people and their numbers of hospital visits....

    Started by nilssonp386‎, 03-29-2015 04:06 PM
    outliers
    • Replies: 13
    • Views: 221
    Yesterday, 06:54 PM Go to last post
  4. 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, Yesterday 05:39 PM
    • Replies: 0
    • Views: 58
    Yesterday, 05:39 PM Go to last post
  5. 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, Yesterday 02:47 PM
    • Replies: 3
    • Views: 80
    Yesterday, 03:43 PM Go to last post
  6. Is a McNemar's test appropriate in this setting?

    I wrote a scientific paper on the use of two different surgical techniques on two organs in the same subject: technique A for one ovary and technique...

    Started by ludomuzii‎, 03-27-2015 05:11 PM
    fisher's exact test, mcnemar's test
    • Replies: 3
    • Views: 143
    Yesterday, 12:25 PM Go to last post
  7. 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, Yesterday 09:26 AM
    correlation, panel data
    • Replies: 0
    • Views: 59
    Yesterday, 09:26 AM Go to last post
  8. 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: 65
    03-29-2015, 01:00 PM Go to last post
  9. 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: 1
    • Views: 85
    03-29-2015, 11:57 AM Go to last post
  10. 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: 123
    03-29-2015, 10:45 AM Go to last post
  11. 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: 109
    03-29-2015, 09:50 AM Go to last post
  12. 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: 157
    03-29-2015, 06:59 AM Go to last post
  13. 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: 76
    03-29-2015, 01:00 AM Go to last post
  14. 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: 119
    03-28-2015, 12:16 PM Go to last post
  15. 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: 127
    03-28-2015, 08:00 AM Go to last post
  16. 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: 104
    03-28-2015, 05:35 AM Go to last post
  17. 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: 144
    03-27-2015, 08:08 AM Go to last post
  18. 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: 98
    03-26-2015, 09:39 PM Go to last post
  19. 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: 180
    03-26-2015, 04:58 PM Go to last post
  20. 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: 92
    03-26-2015, 04:43 PM Go to last post
  21. 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: 159
    03-26-2015, 02:31 AM Go to last post
  22. 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: 96
    03-25-2015, 06:28 PM Go to last post
  23. 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: 109
    03-25-2015, 03:35 PM Go to last post
  24. 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: 111
    03-25-2015, 01:51 PM Go to last post
  25. 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 08:43 AM
    • Replies: 1
    • Views: 50
    03-25-2015, 08:32 AM Go to last post
  26. 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: 166
    03-24-2015, 06:47 PM Go to last post
  27. 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: 122
    03-24-2015, 08:26 AM Go to last post
  28. 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: 136
    03-24-2015, 03:47 AM Go to last post
  29. 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: 159
    03-24-2015, 03:41 AM Go to last post
  30. 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: 157
    03-24-2015, 12:56 AM Go to last post
  31. 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: 159
    03-23-2015, 10:02 PM Go to last post
  32. 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: 94
    03-23-2015, 09:38 PM Go to last post
  33. 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: 130
    03-23-2015, 12:43 PM Go to last post
  34. 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: 126
    03-23-2015, 06:00 AM Go to last post
  35. 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: 147
    03-22-2015, 01:59 PM Go to last post
  36. 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: 130
    03-22-2015, 11:08 AM Go to last post
  37. 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: 144
    03-22-2015, 10:54 AM Go to last post
  38. 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: 232
    03-21-2015, 11:08 AM Go to last post
  39. 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: 459
    03-21-2015, 04:08 AM Go to last post
  40. 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: 168
    03-20-2015, 08:09 PM Go to last post
  41. 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: 167
    03-20-2015, 05:36 PM Go to last post
  42. 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 07:57 PM
    interaction, mixed anova, simple effects
    • Replies: 1
    • Views: 187
    03-20-2015, 01:01 PM Go to last post
  43. 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: 183
    03-20-2015, 09:19 AM Go to last post
  44. 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: 302
    03-20-2015, 05:33 AM Go to last post
  45. Restructuring general panel data to long format

    Every statistical package out there can restructure data from wide to long format, but unfortunately treating multidimensional panel data does not...

    Started by Tony123‎, 03-19-2015 01:05 PM
    • Replies: 0
    • Views: 100
    03-19-2015, 01:05 PM Go to last post
  46. Maximum Likelihood estimator

    If X_1,X_2,....,X_n is a random sample with density f(x;\theta )=\frac{(x+1)}{\theta(\theta+1)}e^{\frac{-x}{\theta}}I_{(0,\infty)}(x),\theta>0 ...

    Started by askazy‎, 03-18-2015 05:19 PM
    • Replies: 4
    • Views: 225
    03-19-2015, 10:34 AM Go to last post
  47. STATS 311 HW Help

    An aircraft identification system is able to decide whether an aircraft entering the airspace is a friend or an intruder correctly 98% of the time....

    Started by biggoofy‎, 03-19-2015 07:53 AM
    • Replies: 1
    • Views: 98
    03-19-2015, 08:15 AM Go to last post
  48. Estimator

    Find the maximum likelihood estimator of f(x/\theta)=\theta(\theta +1)x^{\theta -1}(1-x)I_{}(x),\theta>0 ...

    Started by askazy‎, 03-19-2015 07:21 AM
    • Replies: 3
    • Views: 132
    03-19-2015, 07:46 AM Go to last post
  49. Am I using the right tests for my data set (correlation, multiple regression, ANCOVA)

    So I'm doing a study where I'm looking at what foraging habitats different fish associate with. I'm interested in seeing if foraging surface (i.e....

    Started by srpang89‎, 03-19-2015 12:41 AM
    • Replies: 3
    • Views: 213
    03-19-2015, 07:35 AM Go to last post
  50. Why are these statements false?

    Hello, I was doing a practice test and I got two questions wrong. The answer key said that these two statements were false: As sample size...

    Started by emilybatman‎, 03-19-2015 12:40 AM
    false, help me!, normal curve, sample distribution, standard deviation
    • Replies: 1
    • Views: 169
    03-19-2015, 02:39 AM Go to last post
  51. ANOVA and P-value

    I have a linear regression with an ANOVA table with F(4,8) = 2.763 Regression: 4 df Residual: 8 df F Statistic: 2.763 Significance: .103 ...

    Started by larrywallace‎, 03-18-2015 02:20 PM
    • Replies: 1
    • Views: 138
    03-18-2015, 02:39 PM Go to last post
  52. Post Question regarding statistical analyses of a trial

    I am a college student currently doing a seminar presentation on a drug's effects on insomnia. I am currently looking at trials, and one of the tools...

    Started by rayjay78‎, 03-18-2015 01:48 PM
    cochran-mantel-haenszel
    • Replies: 1
    • Views: 131
    03-18-2015, 02:16 PM Go to last post
  53. Upper limit for a distribution

    Hi, I needed help for something I've been trying to figure out on my own: the standard deviation and mean for GPA at my college. I was able to...

    Started by chubybuny‎, 03-16-2015 10:39 PM
    • Replies: 3
    • Views: 196
    03-18-2015, 08:36 AM Go to last post
  54. ANOVA analysis based on a mixture of within subject and between subject design?

    I have finished an experiment, and I used a mixture of within subject and between subject design, I am wondering if there is a specific name for this...

    Started by leochou1991‎, 03-18-2015 08:23 AM
    anova, between-subject, within-subject
    • Replies: 0
    • Views: 86
    03-18-2015, 08:23 AM Go to last post
  55. How to Calculate Confidence Intervals for Proportions - Quick response appreciated!

    I would like to calculate the 95% confidence intervals (CI) for the percentage of a sample who have an anxiety disorder. For example, if 20...

    Started by bozatron‎, 03-18-2015 04:58 AM
    • Replies: 2
    • Views: 180
    03-18-2015, 07:04 AM Go to last post
  56. Question Questions about the standard error

    SAMPLES The sample mean is an estimate of the population mean. And, the standard error (SE) of the sample mean -- s/SQRT(n) -- is a measure of...

    Started by DrAnthonyRodriguez‎, 03-18-2015 06:27 AM
    standard error
    • Replies: 0
    • Views: 108
    03-18-2015, 06:27 AM Go to last post
  57. Maximum Likelihood estimator

    If X_1,X_2,....,X_n is a random sample of X with density f(x;\theta)=\frac{\theta}{x^2}I_{ i)Find the estimator of moments and discuss its...

    Started by askazy‎, 03-17-2015 09:35 AM
    • Replies: 8
    • Views: 230
    03-17-2015, 04:41 PM Go to last post
  58. Hypothesis when seeking no differences

    Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

    Started by ajr237‎, 03-11-2015 11:49 AM
    2 Pages
    1 2
    • Replies: 17
    • Views: 573
    03-17-2015, 03:00 PM Go to last post
  59. Help analysing percentage change and arcsine

    I'm doing a project at the moment and am currently looking at the percentage change. In order to test it statistically, I have been told I need to...

    Started by ChrisUk‎, 03-17-2015 02:36 PM
    • Replies: 0
    • Views: 109
    03-17-2015, 02:36 PM Go to last post
  60. Non parametric equivilent to ANCOVA

    Is there a non parametric test equivilent to an ANCOVA?

    Started by Savvy‎, 05-14-2008 01:48 AM
    • Replies: 5
    • Views: 9,184
    03-17-2015, 12:54 PM Go to last post

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