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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: 197,273
    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: 67,035
    09-30-2005, 09:44 AM Go to last post
  1. Standard deviation

    Q1)How: Standard deviation usually measuring the spread of the observations? Q2)Why:If we set for the mean =0 and standard deviation=1 and if I...

    Started by ismail‎, 01-07-2013 10:02 AM
    • Replies: 5
    • Views: 1,827
    01-08-2013, 05:11 PM Go to last post
  2. Weights in equation

    Hey guys. I've been working on some data and I've come up with an idea that I don't know how to calculate (since I'm not really a mathematician)....

    Started by starpen‎, 01-08-2013 12:14 PM
    • Replies: 0
    • Views: 1,380
    01-08-2013, 12:14 PM Go to last post
  3. Wink Check moderation using ANCOVA

    I have searched online and still couldnt find an exact way to check whether there is moderation by a continuous covariant between the DV and a...

    Started by cslbilly1990‎, 01-07-2013 11:42 PM
    • Replies: 0
    • Views: 3,319
    01-07-2013, 11:42 PM Go to last post
  4. simple way to calculate error mean square

    I have data from many experiments, I want to calculate the coefficient of variation for each experiment i.e. error mean square/grand mean, is there a...

    Started by sania‎, 01-07-2013 07:14 PM
    • Replies: 0
    • Views: 1,245
    01-07-2013, 07:14 PM Go to last post
  5. Meta-analysis using unpublished randomised trials

    Meta-analysis using unpublished randomised trials Hi, I am intersted to do a meta-analysis, have data set from about 50 experiments, mostly...

    Started by sania‎, 01-07-2013 04:10 PM
    • Replies: 1
    • Views: 1,524
    01-07-2013, 04:40 PM Go to last post
  6. Estimate improvement in forecast accuracy when consolidating similar forecasted items

    Hi All, Brand new to this forum, please don't beat me up too much... I am trying to determine a method that I can use to estimate what I expect...

    Started by scalise530‎, 01-02-2013 04:22 PM
    • Replies: 2
    • Views: 1,238
    01-07-2013, 07:08 AM Go to last post
  7. Simple effects- multiple comparisons adjustments necessary?

    Hi guys, I cannot seem to figure out what the correct procedure is for simple effects analysis when decomposing interactions. So I have a...

    Started by Sunwin‎, 01-03-2013 07:27 AM
    adjustment, anova, multiple comparisons, significant interaction., simple effects
    • Replies: 8
    • Views: 2,491
    01-07-2013, 06:02 AM Go to last post
  8. Post Help with Defining the null hypotheses for Manova

    Hi all, I'm trying to test the combination of 4 different treatments therefore I have 16 different groups with different combinations of the...

    Started by dcodish‎, 01-07-2013 01:55 AM
    hypothesis, manova
    • Replies: 0
    • Views: 1,843
    01-07-2013, 01:55 AM Go to last post
  9. Mixed MANOVA ... or something else?

    Hello Ladies & Gents, I'm working on my dissertation and *thought* I had my stats all figured out until a recent change in my methodology, which...

    Started by saligia‎, 01-07-2013 01:22 AM
    • Replies: 0
    • Views: 1,141
    01-07-2013, 01:22 AM Go to last post
  10. Whether / how to combine 2 linear equations for different variables, and weighting

    I'm analysing results from measurements of 2 variables (a, b). The goal is to use them singly or together to determine a 3rd variable, c. All 3...

    Started by Cally‎, 01-06-2013 11:55 PM
    combine linear equations, data analysis, weighting variables
    • Replies: 0
    • Views: 2,632
    01-06-2013, 11:55 PM Go to last post
  11. Probability and statistics for finance

    Hey! I've got question. Is anyone able to solve/explain to me these two questions? I have an exam in following week, and I have noone else to ask....

    Started by epikurejczyk‎, 01-05-2013 08:01 PM
    • Replies: 3
    • Views: 1,258
    01-06-2013, 06:35 PM Go to last post
  12. Stats question help

    I have been trying to work out a college question, that brought me to your forum :) :tup: I know my answer is wrong, but I cant work out why, any...

    Started by KellySkin‎, 01-06-2013 09:26 AM
    • Replies: 1
    • Views: 1,275
    01-06-2013, 10:05 AM Go to last post
  13. Parameter estimates for main effect conflict with graphical representation: Why?

    Background I am looking at the abundance (counts) of predators in wheat fields. One key factor I want to know is whether wheat fields neighbouring a...

    Started by VictoriaW‎, 01-06-2013 07:40 AM
    • Replies: 0
    • Views: 1,075
    01-06-2013, 07:40 AM Go to last post
  14. covariance is same as expected value in this case?

    Hi all, I was watching a lecture on techtalks.tv (http://techtalks.tv/talks/spectral-approaches-to-learning-latent-variable-models-part-1/57663/) and...

    Started by valentinew‎, 01-04-2013 06:51 PM
    • Replies: 0
    • Views: 1,776
    01-04-2013, 06:51 PM Go to last post
  15. Effect size for Wilcoxon Signed Rank

    1) i want to calculate the effect size for wilcoxon signed rank (paired sample). I have one group of 10 participants. I know the formula for the...

    Started by lynnar‎, 01-22-2012 08:05 PM
    effect size, non parametric
    • Replies: 10
    • Views: 16,130
    01-04-2013, 04:02 PM Go to last post
  16. Two way ANOVA

    Hi, I have 2 groups ('keypad' and 'touch screen'), and each group has teh number of participants who are 'right ahnded and left handed. For...

    Started by lynnar‎, 01-01-2013 01:04 PM
    2 way anova, two way anova
    • Replies: 5
    • Views: 1,980
    01-04-2013, 04:01 PM Go to last post
  17. What test to use?

    Let's say you are testing the affect of two things, A and B, on study subjects. One group of subjects is assigned to A, and the other is assigned to...

    Started by agp‎, 01-03-2013 01:35 PM
    • Replies: 12
    • Views: 2,405
    01-04-2013, 04:00 PM Go to last post
  18. unbalanced two-way ANOVA : How to compute the interaction power ?

    Hi all :) I finished running a two-way anova test : the result for interaction between the two variables is insignificant. To know if no type II...

    Started by fatim‎, 01-04-2013 03:10 PM
    • Replies: 0
    • Views: 1,585
    01-04-2013, 03:10 PM Go to last post
  19. Analysing Boxplots

    Hi all, I have created a bunch of boxplots with R, and was wondering if there is a good way to analyse them or the data statistically. All...

    Started by Bio90‎, 12-29-2012 03:46 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,416
    01-04-2013, 11:00 AM Go to last post
  20. Mediation help needed please

    What am i supposed to be reporting and which significance should i be looking at?

    Started by evenflow‎, 01-03-2013 01:54 PM
    • Replies: 2
    • Views: 2,751
    01-03-2013, 04:54 PM Go to last post
  21. Smile Kurtosis - Example to calculate, Help Please!

    Ok, hope people have PATIENCE with me here...I am doing some stat calculations, but I am NOT a statistician, so please bear with me. Please don't...

    Started by jimc52‎, 08-07-2007 01:39 PM
    • Replies: 5
    • Views: 30,332
    01-03-2013, 01:25 PM Go to last post
  22. Help with null/alternative hypothesis in Z-test of proportions

    I have a clinical trail where all the patients sufferd from a stroke. I need to assess the efficacy of the drug treatment (drug/placebo) for the...

    Started by eladgro‎, 01-03-2013 10:25 AM
    • Replies: 1
    • Views: 3,099
    01-03-2013, 12:03 PM Go to last post
  23. Standard Error - interpretation and relative standard error

    Hi, I am unclear about how to interpret the Standard Error of the Mean (SEM) directly. For example, when a mean is reported as 5.00 + 0.50SEM,...

    Started by DeanP‎, 01-02-2013 08:26 AM
    relative standard error, sampling distribution, standard deviation, standard error
    • Replies: 5
    • Views: 3,847
    01-03-2013, 11:16 AM Go to last post
  24. Online Calculator for Kruskall-Wallis

    :tup:Hello there, I've looked at a few online calculators for the Kruskall-Wallis method, but am unsure which one is easiest/most reliable to use?...

    Started by BiscuitJohn‎, 01-02-2013 02:26 PM
    • Replies: 2
    • Views: 2,236
    01-02-2013, 02:59 PM Go to last post
  25. Compare three groups

    Hi all- I have a very basic question. I measured forces generated with three pairs of tools (2 similar type A tools, 2 similar type B tools, and 2...

    Started by stathelp7‎, 01-01-2013 09:16 PM
    • Replies: 3
    • Views: 1,879
    01-02-2013, 02:41 PM Go to last post
  26. What is the difference between a white noise process and a random process?

    Hi, What is the difference between a white noise process and a random process? Thank you

    Started by Fred_a‎, 01-01-2013 10:04 PM
    random, random process, white noise
    • Replies: 1
    • Views: 3,016
    01-02-2013, 02:23 PM Go to last post
  27. running a meta-analysis with stata

    For my masters I am running a meta-analysis on the effects of protein supplementation on muscle function (walking speed in m/s). For multiple studies...

    Started by dr. Swole‎, 01-02-2013 10:10 AM
    • Replies: 3
    • Views: 4,446
    01-02-2013, 01:21 PM Go to last post
  28. Compare 2 lists for statistical significance , which test to select ?

    I have 2 lists, a list that bought books and a list of readers that read those books. The lists are not coming from the same population . So the...

    Started by tnaser‎, 12-29-2012 11:55 AM
    • Replies: 9
    • Views: 3,989
    01-02-2013, 09:16 AM Go to last post
  29. Compare 2 tests and choose the one that provide more results

    Hi , I have 2 tests, one will give me results for more cases (80%-90%) and another test will give me some results (60%-70%). How can I say or prove...

    Started by tnaser‎, 12-30-2012 02:37 PM
    • Replies: 7
    • Views: 2,454
    01-01-2013, 06:06 PM Go to last post
  30. The other formula for SD

    We all know the formula for SD But I recall a pal of mine long long ago showing me another formula for working out SD that - he argued - was far...

    Started by Philyuko‎, 01-13-2009 09:00 AM
    • Replies: 7
    • Views: 9,787
    01-01-2013, 03:36 PM Go to last post
  31. Correlation

    Hi, I've two monthly datasets: The first , the Percentage of people who intend to buy a house within the next 6 months (for example in December it...

    Started by GIS‎, 12-27-2012 09:13 AM
    • Replies: 7
    • Views: 2,095
    01-01-2013, 03:34 AM Go to last post
  32. Post markov inequality property question

    Dear All, As you know that markov inequality property is: My question is that valid that to use invariant of this property in the reverse way,...

    Started by yahiazr‎, 12-31-2012 03:06 PM
    inequality, markov, research, statistics
    • Replies: 2
    • Views: 1,641
    01-01-2013, 03:10 AM Go to last post
  33. confidence of measurement when only 2 values are available

    Hi there, This isn't a homework question. I'm a PhD student, and I'm currently working on an area that would be a little lengthy and unnecessary...

    Started by jennifer88‎, 12-31-2012 05:28 PM
    • Replies: 0
    • Views: 1,281
    12-31-2012, 05:28 PM Go to last post
  34. Any suggestions?

    I am using Systat 13.1 to predict the influence of tobacco use on blood flow. Tobacco use is an independent binary variable (1,0, yes/no) and blood...

    Started by bgaynes‎, 12-26-2012 04:48 PM
    • Replies: 9
    • Views: 1,126
    12-31-2012, 03:23 PM Go to last post
  35. Help with chi-square test and hypothesis! please!

    I have a clinical trail where all the patients are suffering from a stroke. Half of the patients got drug and the other half got placebo. I need to...

    Started by eladgro‎, 12-31-2012 07:30 AM
    • Replies: 1
    • Views: 1,726
    12-31-2012, 08:58 AM Go to last post
  36. Interpreting beta coefficient with log-transformed DV (back-transforming)

    My (continuous) dependent variable, drug dose, was right-skewed so I log-transformed (lognormal). The co-efficient for gender (female) is -0.4...

    Started by StatsClue‎, 12-22-2012 09:48 PM
    • Replies: 1
    • Views: 1,288
    12-30-2012, 09:09 PM Go to last post
  37. Help with CHI-SQUARE TEST!

    Hello, I have done in Excel Chi-Square test with the help of the function "CHITEST()" and the result that i got is: 2.45978E-08. I have no idea...

    Started by eladgro‎, 12-30-2012 10:07 AM
    • Replies: 2
    • Views: 1,288
    12-30-2012, 07:31 PM Go to last post
  38. calculating probability for a t-distribution

    Hello, I have a set of n real numbers (x1, x2,..., xn). I've calculated the mean and sample standard deviation using Excel and I'm making the...

    Started by eggman2001‎, 12-30-2012 07:17 PM
    • Replies: 0
    • Views: 1,642
    12-30-2012, 07:17 PM Go to last post
  39. Help interpreting box-cox curve

    I've attached a word-doc that contains the said box cox curve. From what I make of it, it is is saying we are 95% confident the best power I should...

    Started by urbano‎, 12-29-2012 04:22 AM
    • Replies: 4
    • Views: 1,200
    12-30-2012, 03:50 PM Go to last post
  40. Kruskal-Wallis significant, yet Dunn's posth test doesn't spot any signif diff

    Hi Guys, I came across this issue, and I would like to have feedback from you. As the thread's title indicate, I ran KW test to test for...

    Started by gianmarco‎, 12-29-2012 11:28 AM
    • Replies: 4
    • Views: 3,947
    12-30-2012, 12:13 PM Go to last post
  41. degrees of freedom for two-way repeated-measures ANOVA

    I had a related topic over on the R forum involving my lmer model, but now I'm more concerned with the degrees of freedom, which I thought was a more...

    Started by marsh‎, 12-30-2012 04:55 AM
    anova, degrees of freedom, repeated measures, two-way, within-subject
    • Replies: 0
    • Views: 3,391
    12-30-2012, 04:55 AM Go to last post
  42. Help interpreting table for chi square analysis.

    Hi Everybody, I am new to this forum. Needing help with some statistics. Please write to me at a novice level. I have attached a table that I...

    Started by Azutrum‎, 12-29-2012 03:31 PM
    • Replies: 2
    • Views: 1,786
    12-29-2012, 04:46 PM Go to last post
  43. Chi-Square and Uniform distributions: Where are they prevalent?

    Hey all. I'm in a pinch on a study and am needing to track down a source which will help me to identify in what areas of research data are organized...

    Started by krytellan‎, 12-27-2012 11:27 AM
    • Replies: 9
    • Views: 3,388
    12-28-2012, 01:34 PM Go to last post
  44. half data is normal - transform for a t-test?

    I have rainwater runoff retention data for a green roof and a concrete roof for 70 separate rain events. I want to compare them using a paired...

    Started by andyspeak‎, 12-26-2012 06:52 AM
    • Replies: 2
    • Views: 1,464
    12-28-2012, 09:47 AM Go to last post
  45. How to performance of a model

    Hello, I was hoping that somebody could advise me how to do determine the error or variation in a model. The model simulates the power demand...

    Started by bradyj2‎, 12-27-2012 06:53 PM
    • Replies: 1
    • Views: 1,728
    12-27-2012, 11:38 PM Go to last post
  46. Which test to use?

    I was wondering if anyone could help? I am researching attitudes to domestic violence. I am researching attitudes of males and females to male and...

    Started by CharlieM‎, 12-27-2012 07:55 AM
    • Replies: 4
    • Views: 1,841
    12-27-2012, 07:14 PM Go to last post
  47. Research design strategy according to the statement

    I have thought for a long time, and really tried hard to figure out the answer. So I want to see if you guys agree my answer for these 2 questions. ...

    Started by nobrainer612‎, 12-27-2012 04:52 PM
    • Replies: 0
    • Views: 1,288
    12-27-2012, 04:52 PM Go to last post
  48. Help with homework - Which statistical significance test to use?

    Hi guys, I have an assignement to do and I need some help with the questions. The data was extracted from 62 patients involved in a study which...

    Started by eladgro‎, 12-26-2012 12:07 PM
    • Replies: 4
    • Views: 1,242
    12-27-2012, 01:06 PM Go to last post
  49. I need to know more statistics, without going to school

    hello I got my bs in statistics 3 years ago. I feel like i dont know enough stats. I know basic things that anyone who took a couple of...

    Started by batista_23‎, 12-26-2012 03:26 PM
    • Replies: 3
    • Views: 1,570
    12-27-2012, 11:38 AM Go to last post
  50. Question on sample var/se and DoF

    When you are calculating a sample's variance or standard error, you use (Sum(X - Xbar)^2)/(n-1), and the square root for SE. n-1 is the degree of...

    Started by agp‎, 12-26-2012 10:41 PM
    • Replies: 4
    • Views: 2,071
    12-27-2012, 09:23 AM Go to last post
  51. Unable to find the correct combination / permutation rule for my statistics project

    First and foremost, THANK YOU in advance for helping me with my statistics project that I have been unable to solve on my own or through the help of...

    Started by eveellence‎, 12-26-2012 07:32 PM
    • Replies: 0
    • Views: 1,260
    12-26-2012, 07:32 PM Go to last post
  52. Statistical test to use

    Hi guys, I have two categorical binary variables. The independent variable is "on campus accommodation" (Yes/no question) and the dependent...

    Started by Gemma.C‎, 12-26-2012 03:05 PM
    • Replies: 0
    • Views: 1,027
    12-26-2012, 03:05 PM Go to last post
  53. Stationarity in a time series - Real growth in GDP and Housing stats

    Hello and happy holidays. I am currently working on time series for the very first time and in connection with that I have tried to identify...

    Started by nudiekap‎, 12-26-2012 06:57 AM
    • Replies: 0
    • Views: 959
    12-26-2012, 06:57 AM Go to last post
  54. how to determine if a "1" tends to occur at the same position in several bit streams?

    I have six data sets of equal length; each data set consists of bits obtained from a device run over the same 12 hour period (the six experiments...

    Started by mlevin77‎, 12-24-2012 05:46 AM
    • Replies: 4
    • Views: 1,330
    12-25-2012, 10:33 AM Go to last post
  55. parametric or non-parametric statistics

    I have two groups (Group I=exercise, group II=control). Each of them has 12 healthy subjects. Exercise group performs 8 weeks of an exercise...

    Started by yucel_kara‎, 12-25-2012 07:31 AM
    • Replies: 0
    • Views: 784
    12-25-2012, 07:31 AM Go to last post
  56. Hard questions related to the hypothesis testing and results

    Here are the questions: 1.) the idea that your results happened by random chance or error, not due to any real differences 2.)To determine...

    Started by nobrainer612‎, 12-25-2012 02:34 AM
    • Replies: 0
    • Views: 1,647
    12-25-2012, 02:34 AM Go to last post
  57. The number of people in the US measured by the Census

    The number of people in the U.S. as measured by the U.S.Census is a ? There are a few choices: In my opinion, it is either (B)...

    Started by nobrainer612‎, 12-24-2012 10:31 PM
    • Replies: 7
    • Views: 1,958
    12-25-2012, 01:52 AM Go to last post
  58. Hypothesis Testing

    I was asked a valid question that I couldn't answer. Why perform Hypothesis Testing when I have the entire population data?

    Started by stats1357‎, 12-24-2012 06:42 PM
    hypothesis testing
    • Replies: 1
    • Views: 1,109
    12-24-2012, 07:52 PM Go to last post
  59. Help understanding log transformation and it's use in confidence intervals

    I have raw data and have done a 90% confidence interval on it (I'm using R and am a beginner , but think I've done it right) I also transformed...

    Started by urbano‎, 12-24-2012 07:32 PM
    • Replies: 0
    • Views: 2,294
    12-24-2012, 07:32 PM Go to last post
  60. Independence?

    Hi. I chose a group of criteria for assessing a study's success. I'm looking at a group of studies and testing whether their reported success...

    Started by Gadgetfingers‎, 12-22-2012 07:18 AM
    • Replies: 1
    • Views: 1,189
    12-24-2012, 07:54 AM Go to last post

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