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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: 67,262
    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: 24,796
    09-30-2005, 09:44 AM Go to last post
  1. I really need help interpreting this study?

    Hello, I'm actually trying to write a sociology paper on race, but I have no idea how to interpret this study:...

    Started by JC177‎, 07-25-2014 03:01 PM
    • Replies: 13
    • Views: 234
    Yesterday, 01:02 PM Go to last post
  2. Comparing two large categorical data sets with low counts

    I'm studying a biological feature which can be classified into 2^20 categories. These categories can be thought as a dictionary of a fixed-length...

    Started by Oreochromis‎, 07-26-2014 11:53 AM
    categorical data analysis, chi square
    • Replies: 4
    • Views: 172
    Yesterday, 12:38 PM Go to last post
  3. Multiple Imputations in a Dataset

    Dear all, I'm a student working on a dataset based on a cross-sectional survey. The dataset includes around 200participants. The main analysis...

    Started by PsychStats_Leb‎, Yesterday 07:18 AM
    missing data, multiple imputations, survey
    • Replies: 0
    • Views: 70
    Yesterday, 07:18 AM Go to last post
  4. Predictive model needed - bespoke or off the shelf software ?

    Good day all, I am a complete novice with stats and zero experience but I do have a stats problem regarding data I have in excel and seek some...

    Started by MrMarkB‎, 07-26-2014 12:34 PM
    • Replies: 1
    • Views: 124
    Yesterday, 12:06 AM Go to last post
  5. Drawing co-ordinates on an image and detecting pixels as xy values.

    Hey, I'm looking forward to draw xy coordinates on the image attached so as to give a xy value to each dot on the image that I can copy to an excel...

    Started by koronfelina‎, 07-25-2014 02:44 PM
    • Replies: 1
    • Views: 49
    07-26-2014, 12:52 AM Go to last post
  6. Exclamation Need help choosing statistical test for catagorical data

    Hi, I am not sure which statistical test I should do. My values are in percentages and the categorical data is for different climate scenarios. I...

    Started by psiz‎, 07-25-2014 09:10 AM
    • Replies: 0
    • Views: 116
    07-25-2014, 09:10 AM Go to last post
  7. Comparing the variance of two samples with differing measurement error

    This is a statistics as applied to astronomy problem - I apologise in advance for my woeful stats knowledge! OK - the problem: For several...

    Started by Craiga‎, 07-24-2014 11:50 PM
    sample comparison, variance
    • Replies: 0
    • Views: 113
    07-24-2014, 11:50 PM Go to last post
  8. Factor analysis - Mean = 0 and Std. = 1 ??

    Hi guys I hope you can help me! I am dooing a factor analysis in SPSS. I am using principal components, listwise, varimax and extract on...

    Started by Kenderdu‎, 07-24-2014 11:01 AM
    • Replies: 2
    • Views: 116
    07-24-2014, 05:00 PM Go to last post
  9. Maximum Likelihood Estimator - Geometrical Distribution

    Do you know a site which gives a step by step solution of finding the MLE for Geometric Distribution? I'm thinking about something like this...

    Started by StatsBeginner‎, 07-24-2014 09:21 AM
    maximum likelihood
    • Replies: 3
    • Views: 113
    07-24-2014, 04:59 PM Go to last post
  10. Determine standard deviation from percentages

    I have a normal distribution of data with a mean of 0. I know that 80% of the data falls within 3 units of the mean. So 80% of the data is from -3...

    Started by bobbytables‎, 07-24-2014 11:48 AM
    means, standard deviation
    • Replies: 4
    • Views: 167
    07-24-2014, 01:44 PM Go to last post
  11. Question Statistical Analysis on Diets - Anyone a fan of Nutritional Sciences? :)

    Hello, My study is composed of 4 diets. One is control and the others are 3 different types of fiber. I have a total of 3 subjects for this study....

    Started by TimTim‎, 07-24-2014 04:04 AM
    • Replies: 6
    • Views: 157
    07-24-2014, 09:22 AM Go to last post
  12. Looking for datas

    Hello, Does somebody know where I can find the mensual evolution of temperature in France from 2000 to 2014 ? Thank you

    Started by roukyno1‎, 07-23-2014 09:38 AM
    • Replies: 1
    • Views: 129
    07-24-2014, 03:27 AM Go to last post
  13. [ HELP] Employees Absence

    Hi everyone, I need a basic procedural help here. I have to analyze the employees absence in a manufacturing firm. I was given the data of...

    Started by klincired‎, 07-22-2014 10:42 PM
    • Replies: 7
    • Views: 138
    07-24-2014, 02:13 AM Go to last post
  14. Help with choosing the right analysis and how to manage a gender-matching variable

    Hi there, Thanks for taking the time to read my question, it is very specific and based on a particular problem I've never come across before. ...

    Started by Helen‎, 07-24-2014 01:42 AM
    gender, moderated multiple regres, regression help, stats help
    • Replies: 0
    • Views: 64
    07-24-2014, 01:42 AM Go to last post
  15. Evaluating Ranked lists

    Hi, I implemented ranking algorithm to rank relevant documents to a given topic. So the algorithm produces ranked list of documents for each...

    Started by Dinindu‎, 07-23-2014 09:37 PM
    chi square, evaluation criteria, ranking
    • Replies: 0
    • Views: 77
    07-23-2014, 09:37 PM Go to last post
  16. 2D Conditional Probability

    Question X, Y are two independent random variables with cumulative distribution functions: F_X(x) = {0, x<0; x/3, 0<x<3; 1, x > 3} F_Y(y) =...

    Started by jhynes6‎, 07-23-2014 02:14 PM
    conditional probabilities
    • Replies: 2
    • Views: 141
    07-23-2014, 05:00 PM Go to last post
  17. Method

    Hi, I am a newbie and I want analyse a set of data I have without using regression and correlation. Please can you outline other methods that would...

    Started by Bisola‎, 07-15-2014 04:33 AM
    • Replies: 5
    • Views: 214
    07-23-2014, 01:38 PM Go to last post
  18. Confidence Interval help

    I am an engineering student working on some research and I am having some trouble constructing a confidence interval. I have various mechanical...

    Started by djb0724‎, 07-23-2014 01:34 PM
    • Replies: 0
    • Views: 95
    07-23-2014, 01:34 PM Go to last post
  19. Joint density distribution and Variance

    Hi everyone! I was wondering if there is a way to calculate the joint distribution of two fully correlated variables, both with known...

    Started by Chris_egel‎, 07-23-2014 04:32 AM
    joint density, variance
    • Replies: 1
    • Views: 97
    07-23-2014, 06:41 AM Go to last post
  20. Significance when there are no occurrences in one of the variables?

    Hi guys! We've been studying the incidence of pigs mounting each other in a group of pigs containing entire male pigs, gilts and castrates and in...

    Started by haldelberg‎, 07-22-2014 11:18 AM
    significance
    • Replies: 3
    • Views: 134
    07-23-2014, 04:04 AM Go to last post
  21. (Please help) Imputing multiple Likert-type items

    I have a set of Likert-type variables that I'm trying to sum up to form a scale. My dataset has around 5000 subjects, and there are about <10%...

    Started by sunny3333‎, 07-22-2014 09:43 PM
    • Replies: 0
    • Views: 118
    07-22-2014, 09:43 PM Go to last post
  22. Molecular genetics study

    Hi Guys, I performed an experiment that is called mRNA poly A tail length assay (MPAT) on three different human tissues including liver, heart,...

    Started by Shamisa‎, 07-22-2014 02:30 PM
    • Replies: 2
    • Views: 184
    07-22-2014, 03:06 PM Go to last post
  23. MLE for X ~ Exp(λ)

    Let (X1, ... Xn) be a random sample from a random variable. Find the maximum likelihood estimator for λ. I know the answer to this but do you...

    Started by StatsBeginner‎, 07-21-2014 11:06 AM
    maximum likelihood
    • Replies: 14
    • Views: 296
    07-22-2014, 07:13 AM Go to last post
  24. Calculate Correlation Coefficient

    Hi guys, It's been a long time since I have stats in school, and I am trying to find the right answer on google to this, but you might be much...

    Started by EricaW‎, 07-22-2014 06:38 AM
    • Replies: 1
    • Views: 145
    07-22-2014, 06:43 AM Go to last post
  25. Hypothesis testing

    Could you please explain me how to do this exercise step by step? (http://oi57.tinypic.com/w1tv78.jpg) I know that it is a one-sided test and...

    Started by StatsBeginner‎, 07-22-2014 04:48 AM
    hypothesis test
    • Replies: 3
    • Views: 139
    07-22-2014, 06:41 AM Go to last post
  26. Simple OLS regression coefficient interpretation question

    I have my dependent variable Y and two independent variables, X_1 and X_2. Now assume at each point in time I convert each data point into...

    Started by TrueTears‎, 07-22-2014 02:23 AM
    • Replies: 1
    • Views: 98
    07-22-2014, 03:20 AM Go to last post
  27. Simple (silly) question

    Hi! I have a very simple (silly) question about Stats. Where does the 1.16 come from? Everything else is given in the exercise but I don't really...

    Started by StatsBeginner‎, 07-21-2014 10:44 AM
    • Replies: 8
    • Views: 140
    07-21-2014, 01:33 PM Go to last post
  28. Determining ideal sample size, testing normality in SPSS, bonferroni adjustment

    Hello all, I am new to the forum. I had a bit of training in statistics and research, particularly statistics in psychology, but I have some basic...

    Started by rsuri‎, 07-21-2014 09:13 AM
    assumptions, bonferroni, bonferroni correction, normality, sample size
    • Replies: 1
    • Views: 148
    07-21-2014, 10:04 AM Go to last post
  29. Volatility of abnormal returns.

    Hi all, When employing raw returns, one defines performance volatility as the standard deviation of these raw returns over some prior period (say...

    Started by Man‎, 07-21-2014 08:13 AM
    • Replies: 0
    • Views: 79
    07-21-2014, 08:13 AM Go to last post
  30. which statistical analysis with study design?

    Hi there I'm doing a study where i measure angles in objects at multiple levels with two different methods with 2 or 3 different readers. Test A is...

    Started by ogcdark‎, 07-18-2014 02:49 AM
    • Replies: 5
    • Views: 234
    07-21-2014, 07:46 AM Go to last post
  31. Chi Square Test, Pre Post Study, Dichotomous Variables, Different Group Sizes

    Hi Everybody, I am a medical student. I am doing a Final Year Project (FYP) and need a little help. I must admit to being a novice statistican and...

    Started by Macho Manu‎, 07-21-2014 06:08 AM
    chi square test, dichotomous, mcnemar test, pre and post
    • Replies: 1
    • Views: 120
    07-21-2014, 06:15 AM Go to last post
  32. Power Analysis for finding correlation of two continuous variables

    Hi, I'd like to do a power analysis. My data has two variables. My null hypothesis would, I'd think, be that the pearson correlation = 0, and the...

    Started by NSmaleBI‎, 07-16-2014 02:34 AM
    • Replies: 5
    • Views: 221
    07-21-2014, 01:54 AM Go to last post
  33. How do I Construct a 95% confidence interval (C.I.) with this formula?

    Hi, Im hoping someone can help do this for me. Construct a 95% confidence interval (Using the following formula: 95% C.I. Equals "mean +/-...

    Started by pcrcool‎, 07-19-2014 05:09 PM
    • Replies: 14
    • Views: 314
    07-20-2014, 04:42 AM Go to last post
  34. Can someone talk me through the very basics of power analysis please?

    Hello, I am looking at doing a study. I am told that I need to do a power analysis, even if I can't use the suggested number of participants,...

    Started by Jake-Finn‎, 07-16-2014 10:31 PM
    • Replies: 5
    • Views: 242
    07-20-2014, 02:16 AM Go to last post
  35. stats scenario problem - need help!

    Hello, New here so sorry if this thread is in the wrong category. I have a simple question with an answer that I cannot figure out. Here is a...

    Started by jay33‎, 07-18-2014 10:27 PM
    • Replies: 2
    • Views: 122
    07-19-2014, 03:41 PM Go to last post
  36. 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: 124
    07-18-2014, 03:17 PM Go to last post
  37. Question Statistics to manage doctors' appointments more reliably?

    Hello Yesterday, I went to an appointment with an ophthalmologist at a big health care center. I wasn't the first patient, but people go there...

    Started by Winfried‎, 07-17-2014 05:53 AM
    • Replies: 8
    • Views: 185
    07-18-2014, 09:03 AM Go to last post
  38. cumulative frequency polygon vs cumulative frequency curve

    According to my book Forming a cumulative frequency polygon indicates that you are assuming that the readings are evenly distributed through out...

    Started by stats_problems‎, 07-18-2014 01:29 AM
    • Replies: 0
    • Views: 113
    07-18-2014, 01:29 AM Go to last post
  39. t-stat and p-value

    Dear all, I have estimated several regressions using loop. I have managed to save the estimated alphas as new variables. Now I need to obtain the...

    Started by Aiko‎, 07-15-2014 04:17 PM
    • Replies: 4
    • Views: 250
    07-17-2014, 05:56 PM Go to last post
  40. Test the difference between the variance of two proportions

    Hello everyone, How can I test the difference between the variance of two proportions? Best, Ale

    Started by Alessandro_Italy‎, 07-17-2014 08:44 AM
    proportion, variance
    • Replies: 3
    • Views: 182
    07-17-2014, 02:54 PM Go to last post
  41. How much high/low is the variance if a variable?

    Hello everyone, How can you determine if a variable has a high variance or not? The variance, the standard deviation and the coefficient of...

    Started by Alessandro_Italy‎, 07-17-2014 08:24 AM
    coefficient of variation, variance
    • Replies: 1
    • Views: 119
    07-17-2014, 11:06 AM Go to last post
  42. Help analyzing result from GLM with a poisson distribution

    Can anyone help us analyse the results of this model? We're trying to test if gender ("koen") influences the occurrence of vocalizations see in pigs...

    Started by haldelberg‎, 07-17-2014 09:07 AM
    • Replies: 0
    • Views: 148
    07-17-2014, 09:07 AM Go to last post
  43. How to compare total weighted average change in average price of many items?

    Hi, I need to compare the average change in prices from 2013 to 2014 for a list of 3000 different products. Below in each spoiler there is...

    Started by fortunesyn‎, 07-10-2014 07:29 AM
    • Replies: 2
    • Views: 213
    07-17-2014, 09:06 AM Go to last post
  44. 2 samples t-test: normal or not?

    Hi. For a 2 sample t-test, where I'm checking the assumptions, I'm getting contradictory (at least to me) results regarding normality, between...

    Started by deltango‎, 01-24-2014 07:57 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 543
    07-16-2014, 09:47 PM Go to last post
  45. Interrater Reliability estimate (pearson's r)

    Hi All, I am in need of some help. I am trying to determine the correlation of 5 continuous variables to determine the interrater reliability...

    Started by gradstudent4life‎, 07-16-2014 06:44 PM
    • Replies: 1
    • Views: 148
    07-16-2014, 08:11 PM Go to last post
  46. What are the advantages of the mean squared error versus the mean absolute error?

    I understand the formulas for each, but don't understand the advantages of using one over the other. If you could provide a situation that would...

    Started by GreggAlexander‎, 07-15-2014 11:06 PM
    advantage, error metrics, mean absolute error, mean squared error
    • Replies: 2
    • Views: 223
    07-16-2014, 10:26 AM Go to last post
  47. Minimal significant difference between two scores

    Hi, I'm presently working on the methodology of a psychological experiment, and I'm having trouble to decide of the best way to choose the...

    Started by Hyruuk‎, 07-16-2014 09:02 AM
    • Replies: 0
    • Views: 120
    07-16-2014, 09:02 AM Go to last post
  48. Change scores: t-test or mann-whitney U test ?

    Hi there Nice forum btw. Question: I have change-scores on pain in 37 patients pre/post intervention. which test do you use? t-test or...

    Started by ogcdark‎, 07-16-2014 03:35 AM
    change score, t-test
    • Replies: 1
    • Views: 144
    07-16-2014, 06:38 AM Go to last post
  49. GLM, poisson distribution, R

    Hi guys We've studied in total 60 groups of pigs (30 groups including male pigs, 30 groups of only females) for the occurrence of fighting...

    Started by haldelberg‎, 07-16-2014 05:48 AM
    • Replies: 0
    • Views: 111
    07-16-2014, 05:48 AM Go to last post
  50. Type of a variable

    Good morning dears, Please, I have a question. I am using a variable, which is "Time spent in using a site" which is measured on categories:...

    Started by HadiRabee‎, 07-16-2014 04:07 AM
    • Replies: 0
    • Views: 120
    07-16-2014, 04:07 AM Go to last post
  51. Sample size for superiority trial

    Hey statistigeniuses, I would greatly appreciate some advice regarding a trial I am designing. I want to determine the most comfortable among 4...

    Started by icemank‎, 07-15-2014 10:15 PM
    sample size, statistics, superiority trial
    • Replies: 0
    • Views: 143
    07-15-2014, 10:15 PM Go to last post
  52. Question how to test (same shape distribution) assumption of Mann Whitney test

    Hello, I want to know how to test ( the same shape distribution) assumption of Mann Whitney test using spss I tried to confirm this assumption by...

    Started by tonia bird‎, 07-15-2014 06:48 PM
    • Replies: 1
    • Views: 175
    07-15-2014, 09:02 PM Go to last post
  53. Time series analysis

    I have no experience with time series analysis, but have a dataset that needs attention. I have three years worth of population size estimates at...

    Started by evoeco‎, 07-15-2014 11:09 AM
    • Replies: 5
    • Views: 194
    07-15-2014, 06:07 PM Go to last post
  54. mid interval values

    Hi, i'm having trouble finding the correct mean (2.38) and standard deviation(1.54). I think i'm using the incorrect mid interval values. (i used:1 ,...

    Started by stats_problems‎, 07-15-2014 04:09 PM
    • Replies: 0
    • Views: 116
    07-15-2014, 04:09 PM Go to last post
  55. Clarification on Error Propagation

    I thought I understood the basic operations for error propagation (addition, multiplication, etc), but I have a few questions: 1. Is variance the...

    Started by chelonidae‎, 07-15-2014 03:32 PM
    confidence intervals, error propagation
    • Replies: 0
    • Views: 126
    07-15-2014, 03:32 PM Go to last post
  56. Adjust Wald Test for Type 1 Error

    Hello All, I am running regression models with a polytomous dummy variable predictor (3 category) in Mplus. I am able to use Wald tests of...

    Started by Ray P.‎, 07-15-2014 12:00 PM
    • Replies: 0
    • Views: 146
    07-15-2014, 12:00 PM Go to last post
  57. KS test, non normality

    We want to compare two continuous variables in R that are not normally distributed. As you can see, both variables contain a lot of zeros, whenever...

    Started by haldelberg‎, 07-15-2014 09:31 AM
    • Replies: 4
    • Views: 197
    07-15-2014, 10:24 AM Go to last post
  58. KS Test - help with ties in R

    We are trying to compare two samples that are not normally distributed. We're trying to use the KS test in R, but we get a warning saying that an...

    Started by haldelberg‎, 07-15-2014 08:57 AM
    • Replies: 1
    • Views: 149
    07-15-2014, 09:02 AM Go to last post
  59. Datamining - Filters that Correspond to Highest Outcome Variable

    I'm beginning a data analytics project and am curious what the best approach is to handle the following scenario: 1 outcome variable vOutcome...

    Started by bscully‎, 06-30-2014 09:28 AM
    datamine classification
    • Replies: 2
    • Views: 227
    07-15-2014, 08:27 AM Go to last post
  60. what test / program do I use?????

    Hi all, This is my first time posting. Im stuck and trying to have someone point me in the right direction. I have a data set from with 9...

    Started by jbone8277‎, 07-14-2014 02:40 PM
    • Replies: 3
    • Views: 235
    07-15-2014, 08:04 AM Go to last post

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