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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: 197,355
    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: 67,076
    09-30-2005, 09:44 AM Go to last post
  1. Appropriate to use time as covariable in ANCOVA?

    Hello stats people, I need to assess whether the rate of increase (in soil carbon) differs significantly between two groups (forests). I believe...

    Started by aibing‎, 09-26-2012 10:33 PM
    ancova
    • Replies: 11
    • Views: 2,925
    09-30-2012, 10:50 PM Go to last post
  2. Approximate Average

    Hi, I am very new to statistics, just started a couple of days ago and have a question: Why do we use approximate average in sample variance? Why...

    Started by bornconfused‎, 01-12-2011 10:32 AM
    • Replies: 5
    • Views: 7,518
    01-15-2011, 01:44 PM Go to last post
  3. Approximating the mean and standard deviation

    Hi, I just started my statistics class and I've been having a little trouple grasping it. I just don't know where to start with this and my book is...

    Started by recipient‎, 01-28-2007 04:34 PM
    • Replies: 0
    • Views: 5,486
    01-28-2007, 04:34 PM Go to last post
  4. approximation

    Could someone tell me how iH was approximated from the equation at the top? Which approximation rule was used?

    Started by macro90‎, 10-30-2005 05:39 AM
    • Replies: 2
    • Views: 3,103
    10-30-2005, 09:29 AM Go to last post
  5. 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: 1,105
    03-29-2015, 09:50 AM Go to last post
  6. Apriori sample size calculation for mixed ANOVA

    Hello, I'm trying to calculate the required sample size for my study to show significant effects. I'm expecting to analyse my data using a series of...

    Started by cnelson‎, 05-02-2016 06:15 AM
    • Replies: 0
    • Views: 1,538
    05-02-2016, 06:15 AM Go to last post
  7. AR processes and SAS

    Xt + 1.2X{t-1} + 0.4X{t-2} = at and Xt - 0.3X{t-1} + 0.6X{t-2} = 5 + at (All of the t's and {} are subscripts) So I am supposed to figure...

    Started by parallelepiped‎, 02-23-2010 11:47 AM
    • Replies: 0
    • Views: 1,744
    02-23-2010, 11:47 AM Go to last post
  8. AR(1) ACF Graph - Why is it showing correlations for lag bigger than 1?

    Hi Everybody, I think that my brain is lacking the part necessary to understanding time series. I've been researching an answer to my question...

    Started by JeDoisEtreHandicapeEnStat‎, 04-29-2014 03:58 AM
    • Replies: 3
    • Views: 2,494
    05-04-2014, 04:41 AM Go to last post
  9. AR(1) model help

    AR1 model how to do it,

    Started by tradealerts55‎, 04-17-2013 07:34 PM
    ar(1) model help, stats
    • Replies: 0
    • Views: 1,270
    04-17-2013, 07:34 PM Go to last post
  10. AR(1) time series data

    Hey guys! First I would like to say hello to you, this is my first post in this forum. Maybe you can help me with the following problem: I...

    Started by koxer‎, 03-07-2008 02:26 AM
    • Replies: 0
    • Views: 3,669
    03-07-2008, 02:26 AM Go to last post
  11. AR(p) impulse response function and confidence intervals

    Hello everyone, I am estimating an AR(p) process from dynamic panel data and I would like to calculate the impulse response function of my...

    Started by OKar‎, 06-01-2011 06:40 PM
    • Replies: 0
    • Views: 4,942
    06-01-2011, 06:40 PM Go to last post
  12. ARCH-process with exponencial variance function

    I need some help for a proof regarding Engles ARCH-paper from 1982. For an ARCH-process with a variance function h_t = exp(a_0 + a_1 y_{t-1}^2)...

    Started by Mst‎, 07-07-2016 12:44 PM
    arch, exponencial, time series, variance
    • Replies: 0
    • Views: 1,103
    07-07-2016, 12:44 PM Go to last post
  13. Arcsin transform

    Hello, I came across 2 different formulas for arcsin transformation of proportions (0-1) in excel: 1. =ASIN(SQRT(appropriate cell)) 2....

    Started by kasperski‎, 01-18-2011 05:29 PM
    • Replies: 3
    • Views: 32,395
    01-19-2011, 02:58 PM Go to last post
  14. Arcsine Root Transformation

    Hi everybody, I'm hoping that someone will be able to help with this as I can't seem to find a solution anywhere. I have proportion data that I...

    Started by Drosophila‎, 06-15-2010 08:54 AM
    • Replies: 2
    • Views: 5,605
    06-15-2010, 11:06 AM Go to last post
  15. Are 2 means statistically different?

    Good morning, I was wondering if there is a way to calculate a p value with only the following information: Group A: n=64; Oswestry Disability...

    Started by Trabeculae‎, 01-01-2017 01:39 PM
    standard deviation, t-test; variance; excel
    • Replies: 3
    • Views: 3,261
    01-02-2017, 10:56 AM Go to last post
  16. Are all retrospective studies exploratory?

    Are all retrospective studies exploratory in their nature? They are focused on finding associations and not causality.

    Started by Markica85‎, 12-17-2016 11:36 AM
    • Replies: 3
    • Views: 3,240
    12-17-2016, 01:49 PM Go to last post
  17. Are all UMP (uniformaly most powerful) tests unbiased?

    If so, what is the reason?

    Started by hehe1223‎, 04-14-2011 12:08 PM
    • Replies: 0
    • Views: 1,776
    04-14-2011, 12:08 PM Go to last post
  18. Are chi squred tests always 1-tailed or 2 tailed?

    Suppose we wanted to test whether 2 categorical variables are related as folllows: H0: The two variables are not related HA: The two variables ARE...

    Started by FluffyPuff‎, 11-08-2010 04:29 PM
    • Replies: 4
    • Views: 29,030
    11-11-2010, 07:35 PM Go to last post
  19. Are confidence limits additive?

    Imagine you have several categories (say, genera of a kind of animal), and, for each category, you have an estimate of the mean number of items (say,...

    Started by jonesor‎, 11-04-2008 07:20 AM
    • Replies: 1
    • Views: 4,836
    11-04-2008, 05:22 PM Go to last post
  20. Are hedges g and hedges adjusted g the same?

    My stat program (comphrehensive meta-analysis 2.0) gives a hedges g (as well as other effect sizes). I am wondering if that hedges g is really...

    Started by Teesha‎, 12-19-2008 05:25 PM
    • Replies: 1
    • Views: 5,971
    06-20-2009, 09:32 AM Go to last post
  21. Question Are McNemar's and Binomial the right tests for my data

    Hi everyone. I have performed an experiment, where I have real and synthesised movie data. My participants were shown either a real movie, or a...

    Started by shaw2thefloor‎, 04-03-2014 07:20 AM
    binomial, chi sq test, mcnemar, turing test
    • Replies: 2
    • Views: 910
    04-03-2014, 08:20 AM Go to last post
  22. Are my means significantly different? (2 sample, non parametric required)

    Hi guys! I have a data set with 2 conditions (not before/after style) and a value for each individual. I need to know if the means of the 2...

    Started by marla‎, 02-22-2014 09:42 PM
    compare 2 means
    • Replies: 5
    • Views: 2,019
    02-24-2014, 06:33 AM Go to last post
  23. Are my results significant?

    Hi, I've done a psychology experiment, and I have 7 participants, who have all done 4 conditions, and 5 repetitions of each. I've done a one-way...

    Started by helenwilliams‎, 05-02-2008 11:35 AM
    • Replies: 4
    • Views: 3,793
    05-05-2008, 06:10 AM Go to last post
  24. Are nearly identical QIC scores considered equal?

    I am using QIC (Quasilikelihood under the Independence model Criterion) to evaluate different correlation matricies in a GEE (using identical...

    Started by titopuente‎, 07-15-2012 10:50 PM
    qic, qicc
    • Replies: 0
    • Views: 970
    07-15-2012, 10:50 PM Go to last post
  25. Are percentages nominal, ordinal, interval or ratio?

    Or can percentages not really be pigeonholed into those 4 scales? I know those scales are not exhaustive, but I'm not familiar with anything...

    Started by TheMonk‎, 05-04-2012 11:30 PM
    • Replies: 0
    • Views: 5,150
    05-04-2012, 11:30 PM Go to last post
  26. Question Are pH levels considered as discrete or continuous?

    Hi everyone, I'm in desperate need of help with my lab report. I no stats genius so any help from all you stats geniuses will be greatly appreciated....

    Started by xkycee‎, 02-11-2015 10:55 AM
    • Replies: 1
    • Views: 2,536
    02-11-2015, 11:51 AM Go to last post
  27. Are standard deviation and z scores distorted with small samples?

    If the standard deviation of a coin toss is one based on heads +1 tails -1.using population standard deviation. That should give a z score of 1 for a...

    Started by andy2001‎, 01-28-2009 12:55 PM
    • Replies: 4
    • Views: 5,090
    01-28-2009, 01:35 PM Go to last post
  28. Are standardised effect sizes usually biased?

    Hi all. I've been thinking about standardized effect sizes such as Cohen's D. They're getting pretty popular in psychology, and quant research...

    Started by CowboyBear‎, 06-12-2014 06:42 PM
    • Replies: 10
    • Views: 1,879
    06-12-2014, 08:46 PM Go to last post
  29. are t-test based confidence intervals "Wald-type"?

    Hi! It might be a trivial question but I would like to refer to "traditional" confidence intervals for sample mean (those based on a t-test), in a...

    Started by lililouki‎, 06-03-2009 09:21 AM
    • Replies: 2
    • Views: 5,447
    06-04-2009, 04:08 AM Go to last post
  30. Are the Observations in A Random Sample Independent?

    Hi, guys. I am learning the t-test on my own. The assumptions of t-test have been confusing to me. The assumptions included "A random...

    Started by Evan918‎, 05-13-2016 02:31 AM
    independent observations, random sample, statistics
    • Replies: 3
    • Views: 1,893
    05-15-2016, 03:45 AM Go to last post
  31. Are the parametric analyses appropriate?

    In an experimental study, the aesthetic value (independent var) of a picture is manipulated into (low and high quality). "Low Quality" -- to make it...

    Started by uxk8396‎, 09-15-2016 07:08 PM
    anova, manova, regression analysis
    • Replies: 0
    • Views: 936
    09-15-2016, 07:08 PM Go to last post
  32. Are there residual plots for Poisson Regression?

    Does one assess the normality of residuals via residual plots?

    Started by lord12‎, 04-11-2013 12:42 PM
    • Replies: 2
    • Views: 1,715
    04-11-2013, 12:46 PM Go to last post
  33. Are there variations of the exponential distribution formula

    I have been trying to solve the question below for over an hour. I even found the answer to a similar problem on a Web site, but I can't understand...

    Started by ealeql‎, 04-16-2010 05:35 PM
    • Replies: 6
    • Views: 12,665
    04-17-2010, 02:11 PM Go to last post
  34. Are These Correlation Coefficients Accurate?

    Greetings. I am stumbling around in EXCEL trying to figure out whether or not my correlation coefficients are accurate. I have a gut feeling that...

    Started by tfj‎, 11-25-2005 09:31 PM
    • Replies: 6
    • Views: 6,577
    11-27-2005, 06:13 PM Go to last post
  35. Are these relationships significant (3 variables)? How to test?

    Hi again statistics community I have data on age at reproduction in male and female animals (females on X, males on Y in attached figure) and data...

    Started by ~Narayan~‎, 08-31-2012 02:49 PM
    • Replies: 3
    • Views: 2,232
    09-02-2012, 01:27 AM Go to last post
  36. are these samples independent?

    Sample 1 was selected to represent a population in 1 year. Sample 2 was selected to represent the same population in another year. Different...

    Started by stat_analyst‎, 06-06-2016 12:24 PM
    • Replies: 0
    • Views: 634
    06-06-2016, 12:24 PM Go to last post
  37. Are these statements true

    My goal in posting this, is to be sure what I understand is true and accurate. Ultimately I need to explain to managers why so many (900 out of 40K)...

    Started by Grayco‎, 11-04-2015 12:23 PM
    • Replies: 2
    • Views: 1,893
    11-11-2015, 11:33 AM Go to last post
  38. Are these Statements True?

    (1) “Multiplying the dependent variable by 10 and the regressor by 100 would not change the regression R2.” I think this is true because R2...

    Started by messianic‎, 07-20-2010 04:11 PM
    • Replies: 1
    • Views: 3,250
    07-20-2010, 04:25 PM Go to last post
  39. Are these two statements identical?

    If I were to take a sample from a population of 500 products manufactured each day and calculate a confidence interval at a confidence level of 99%...

    Started by Cheeychops‎, 02-14-2014 10:48 AM
    • Replies: 0
    • Views: 1,216
    02-14-2014, 10:48 AM Go to last post
  40. Are they right?

    I have a homework assignment I need help on. Can you guys check my answers? 1. Assume that you bought a ticket and your bro bought two. There...

    Started by navyseal2413‎, 06-08-2008 05:35 PM
    • Replies: 1
    • Views: 1,817
    06-08-2008, 06:20 PM Go to last post
  41. Are two sources of variation ever completely independent?

    Pick three values to represent the true value, and two error sources and put them as the header in separate columns. Remember to include a positive...

    Started by CuriousJohn‎, 01-20-2016 03:18 PM
    independence, variance
    • Replies: 1
    • Views: 1,206
    01-20-2016, 03:54 PM Go to last post
  42. Are Unbiasedness and Accuracy of the estimates, all to determine the sample size?

    For determining sample size , why is to focus on the unbiasedness and accuracy of the estimates ? Are this two properties, unbiasedness and...

    Started by Cynderella‎, 08-23-2015 03:32 AM
    accuracy, references, sample size, sampling, unbiased estimator
    • Replies: 0
    • Views: 806
    08-23-2015, 03:32 AM Go to last post
  43. Are university grades an ordinal variable?

    Hi guys, this is my first post here and I really hope I can get some help, cause I'm about to deliver my master thesis and I'd like some support. ...

    Started by Geheta‎, 05-25-2011 01:31 PM
    • Replies: 5
    • Views: 6,907
    05-26-2011, 11:27 AM Go to last post
  44. Are weighted means appropriate?

    Hi- I am looking for information about weighted means. Are they appropriate to use when sample sizes are unequal? I am measuring plant roots- some...

    Started by Claire‎, 04-10-2006 03:01 PM
    • Replies: 4
    • Views: 2,802
    04-12-2006, 08:42 AM Go to last post
  45. Are x and y values interchangeable when computing Kappa?

    Are x- any y-values interchangeable when computing Kappa? For example, I have ratings of two coders, Coder 1 and Coder 2, and I want to compute...

    Started by dadrivr‎, 01-19-2010 07:36 PM
    • Replies: 0
    • Views: 2,082
    01-19-2010, 07:36 PM Go to last post
  46. Area under a curve..Need Help...

    If a confidence interval for the mean at the confidence level .93 is (23, 41), then how much area is under the curve of the distribution of the...

    Started by mythtrick777‎, 05-09-2010 10:47 PM
    • Replies: 3
    • Views: 3,100
    05-10-2010, 02:49 PM Go to last post
  47. Area under the curve after 10-fold cross validation

    Hi everyone, After performing a 10-fold cross validation, I now have area under the curve (AUC) for each of the 10 test subsets. I calculated the...

    Started by Sam2772‎, 08-08-2017 10:00 AM
    area under the curve, cross validation
    • Replies: 5
    • Views: 497
    08-10-2017, 04:28 AM Go to last post
  48. Area under the curve of a confidence interval?

    Hi, can anyone help me with answering this question. Suppose you take a sample of n individuals and construct a confidence interval for the mean...

    Started by augustusachilles‎, 05-10-2010 04:58 PM
    • Replies: 3
    • Views: 4,776
    05-12-2010, 01:35 PM Go to last post
  49. argh help please :(

    A certain population has a bimodal distribution with a mean of 58.5 and a standard deviation of 2.5. Many samples of size 25 are randomly selected...

    Started by ladolcevita86‎, 04-15-2008 09:04 PM
    • Replies: 1
    • Views: 2,374
    04-16-2008, 02:38 AM Go to last post
  50. Arima

    Hi anyone knows how to calculate ARIMA using excel and also tell where i can find an example jay

    Started by jayaramg‎, 10-03-2009 07:20 PM
    • Replies: 1
    • Views: 8,084
    10-04-2009, 09:39 AM Go to last post
  51. ARIMA (p,d,q) layman's terms

    I need to investigate how to build an ARIMA model, but can anyone describe for me the meaning of (p,d,q) in layman's terms.. when and how to use...

    Started by podarum‎, 12-22-2011 02:30 PM
    • Replies: 0
    • Views: 3,779
    12-22-2011, 02:30 PM Go to last post
  52. ARIMA estimation

    Hi, if I've got a time series which has to be differentiated two times in order to be stationary, do I then have to look at the correlogramm of...

    Started by panta_rhei‎, 02-29-2008 03:36 PM
    • Replies: 0
    • Views: 2,267
    02-29-2008, 03:36 PM Go to last post
  53. ARIMA identification

    Hi, I kind of stuck here with a ARIMA estimation. I had a series which I differenced two times in order to make it stationary. The correlogram of...

    Started by panta_rhei‎, 02-18-2008 02:46 PM
    • Replies: 3
    • Views: 3,323
    02-19-2008, 12:00 PM Go to last post
  54. ARIMA in SYSTAT

    Dear all I am new user of SYSTAT. I am trying to use the ARIMA model of SYSTAT to predict climate (Monthly average temperature) for Vietnam. So, I...

    Started by MauND‎, 01-27-2011 06:53 AM
    • Replies: 0
    • Views: 2,511
    01-27-2011, 06:53 AM Go to last post
  55. arima methods and filterind

    Hello, What is the effect of filtering data before applying arima methods on a time serie ? What would be the advantages and drawback of...

    Started by roukyno1‎, 07-18-2014 04:31 AM
    • Replies: 3
    • Views: 1,385
    07-18-2014, 03:17 PM Go to last post
  56. Arima modelling application

    Good afternoon everyone. I'm currently looking at the best way to forecast activity levels using time series data. From this I need to provide a...

    Started by tomo‎, 08-07-2014 11:10 AM
    • Replies: 0
    • Views: 1,037
    08-07-2014, 11:10 AM Go to last post
  57. ARIMAX variable selection

    Hi, could anyone tell me how ARIMAX does variable selection? I mean if I have a dependent variable 'price' and 15 other independant variables...

    Started by podarum‎, 04-06-2012 12:02 PM
    • Replies: 0
    • Views: 2,658
    04-06-2012, 12:02 PM Go to last post
  58. Arithmetic Mean and Averages

    Say I take the arithmetic mean of a group of numbers. 1a) Am I assuming a normal distribution when I do this? I think I am because the mean...

    Started by interestednew‎, 07-07-2011 12:54 PM
    • Replies: 1
    • Views: 2,134
    07-07-2011, 01:06 PM Go to last post
  59. Arithmetic y-axis and log x-axis appears normally distributed

    I have data that when plotted with an arithmetic y axis and a log x axis looks exactly like a gaussian distribution. But, being log x, I do not...

    Started by r9ohcop‎, 07-30-2012 06:11 PM
    • Replies: 4
    • Views: 2,702
    07-30-2012, 06:33 PM Go to last post
  60. ARMA interpretation

    Hello, I'm currently working on ARMA models and I'm trying to understand if the number of birds seen one year depends on the number of birds...

    Started by victornitho‎, 05-06-2015 06:54 AM
    • Replies: 0
    • Views: 1,075
    05-06-2015, 06:54 AM Go to last post

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