1. Announcement:
    Want access to a chatbox?
    Dason ‎(Devorador de queso)
    05-10-2017
    Views:
    1,785
+ Post New Thread
Page 92 of 294 FirstFirst ... 42 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 142 192 ... LastLast
Threads 5461 to 5520 of 17583

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: 196,631
    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: 66,652
    09-30-2005, 09:44 AM Go to last post
  1. Variance calculation of discrete function (A-B+C-D) - assuming no independence

    Hi, wonder if you can help me to verify the calculation below since I am far from being an expert in the field. I have 4 discrete variables...

    Started by xchaduc‎, 06-18-2013 05:02 AM
    • Replies: 2
    • Views: 4,904
    06-18-2013, 08:39 AM Go to last post
  2. Can one use different samples in pre and post tests?

    Generally I have seen that pre and post intervention tests are applied on the same sample from a population undergoing an intervention. e.g. same set...

    Started by vishnuagni‎, 06-17-2013 11:49 AM
    • Replies: 5
    • Views: 1,945
    06-18-2013, 12:19 AM Go to last post
  3. Best Way to Analyze Grouped Within-Set Data?

    My data set compares the performance/behavior of 2 different controllers of a biomechanical model; the modeled limb is supposed to start at an...

    Started by statsSeeker‎, 06-12-2013 12:43 AM
    • Replies: 4
    • Views: 1,202
    06-17-2013, 06:44 PM Go to last post
  4. Estimate the unknown parameters

    How we could estimate the parameters of non-linear combination of Normal Distribution Random Variables? Thank you

    Started by Ferra‎, 06-13-2013 08:10 PM
    • Replies: 9
    • Views: 1,788
    06-17-2013, 12:01 PM Go to last post
  5. Please Help: Budget Project Due tomorrow!

    Hello, I am new to this forum and I have limited experience with business stats, so I'm hoping I can find some helpful information for my budget...

    Started by Jg1659‎, 06-17-2013 10:40 AM
    • Replies: 1
    • Views: 1,150
    06-17-2013, 10:41 AM Go to last post
  6. statistics 101-statistical tests help!

    Hi. I'm really sorry if this question is in the wrong place. I'm trying to figure out and justify statistical tests to be used for a research...

    Started by vrodge‎, 06-17-2013 10:11 AM
    mann-whitney u, parametric test, significance testing, t-test, wilcoxon
    • Replies: 0
    • Views: 908
    06-17-2013, 10:11 AM Go to last post
  7. Question a good example of ANCOVA in R

    Hi, I was wondering if someone can provide a nice and quite complete example of ANCOVA in R. thanks :)

    Started by stablum‎, 06-17-2013 09:07 AM
    ancova, rlanguage
    • Replies: 2
    • Views: 1,345
    06-17-2013, 09:23 AM Go to last post
  8. Correlation between two coefficients in linear regression?

    Hi, I have a statistics question that has been bugging me. Consider model y=beta1*x1+beta2*x2+epsilon where x1 and x2 are both mean 0 with...

    Started by spikefire87‎, 06-17-2013 05:53 AM
    • Replies: 0
    • Views: 739
    06-17-2013, 05:53 AM Go to last post
  9. Help with Kaplan-Meier Analysis

    Hello We have done a retrospective study on the survival of fillings in teeth. The situation is as follows: When the filling was lost: Coded as...

    Started by helleslover‎, 06-17-2013 02:51 AM
    censoring, kaplan meier
    • Replies: 2
    • Views: 1,492
    06-17-2013, 03:56 AM Go to last post
  10. Hypotheses Testing regarding Proportion-Question

    A computer chip manufacturer claims that no more than 2% of the chips it sends out are defective. An electronics company, impressed with this claim,...

    Started by mohit.soni1093‎, 06-16-2013 10:39 PM
    • Replies: 1
    • Views: 2,429
    06-17-2013, 02:21 AM Go to last post
  11. Someone puts Cohen's d in a nutshell, please

    Hi, I came across Cohen's d statistic and I would very appreciate if anyone could provide me with a brief explanation of it and with an example...

    Started by gianmarco‎, 09-02-2010 10:26 AM
    • Replies: 7
    • Views: 96,118
    06-15-2013, 05:17 PM Go to last post
  12. Transformation to Stabilize Variance

    Problem: When Y (> 0) has mean and variance equal to \mu and \mu/n respectively, it is shown in the textbook that the appropriate transformation of...

    Started by simplemts‎, 06-15-2013 02:38 PM
    • Replies: 1
    • Views: 2,615
    06-15-2013, 03:06 PM Go to last post
  13. Estimating sample size for reliability study

    Hello, I'm having problems calculating the required sample size for my PhD study. I have designed my first study, which is comparing moral...

    Started by BG2‎, 03-05-2013 08:01 PM
    reliability, sample size, sample size determination, test-retest sample size, validity testing
    • Replies: 1
    • Views: 8,450
    06-15-2013, 02:11 PM Go to last post
  14. Dealing with multicollinearity. Small N. Enough to remove variable?

    Hello all, I'm doing a small N (108 country years), time series, cross country, multiple regression research. - I have 2 independent variables...

    Started by ThijsNijmegen‎, 06-15-2013 05:37 AM
    • Replies: 2
    • Views: 2,153
    06-15-2013, 01:42 PM Go to last post
  15. sales figures - real problem at work

    Hi, I work in retail sales part time. Our sales performance has recently started to be measured against the other colleagues in the shop. Each...

    Started by peter1234‎, 06-13-2013 10:18 AM
    • Replies: 5
    • Views: 1,735
    06-15-2013, 03:16 AM Go to last post
  16. Analysing proportions/percentage data

    Hi, Please can anyone help, I have this data attached - I need to find the average mileage at when the headlights fail ( headlight lifetime) ...

    Started by LizR‎, 06-09-2013 02:49 PM
    • Replies: 3
    • Views: 1,378
    06-14-2013, 07:50 PM Go to last post
  17. How to group variables for regression analysis?

    Hi all, Here's my problem: I have 6 variables: Sex (1,2), Age (18, 18, 19, 21, 25, 25, etc), and four variables describing physical parameters; W,...

    Started by DarrylR‎, 06-13-2013 11:59 PM
    age groups, cluster analysis, regression analysis
    • Replies: 2
    • Views: 1,224
    06-14-2013, 09:45 AM Go to last post
  18. Testing for difference between two percentages (using confidence intervals)

    Hello, hopefully someone can help me with a question: I wish to test for whether the difference between 2 percentages is significantly different....

    Started by 2scoops‎, 06-14-2013 09:43 AM
    • Replies: 0
    • Views: 1,919
    06-14-2013, 09:43 AM Go to last post
  19. Question Log-linear or logistic regression

    Hi, For my thesis, I investigate an issue and me and my teacher as well are doubting on the right way to analyze the research question. The...

    Started by unknownbomb‎, 06-13-2013 10:59 AM
    • Replies: 3
    • Views: 2,220
    06-14-2013, 04:44 AM Go to last post
  20. Determining true median

    I'm sure this question is beneath this forum, but I need help nonetheless. I have a set of data, e.g. 25 23 52.08% 13 25 34.21% 14 20 41.18% ...

    Started by dbogey‎, 06-13-2013 09:07 PM
    • Replies: 0
    • Views: 1,300
    06-13-2013, 09:07 PM Go to last post
  21. How to prove that a sample is statistically significant?

    Hello, I've been searching all over the internet for a formula or a test that will help me understand if my sample (41 answers) is statistically...

    Started by bsantos‎, 06-13-2013 05:42 AM
    sample size, statistical significance
    • Replies: 8
    • Views: 2,394
    06-13-2013, 05:32 PM Go to last post
  22. Sport Statistical Modelling

    I am very interested in football and want to create a statistical model for predicting the amount of goals scored by football team by using past...

    Started by mustardpower‎, 06-13-2013 03:37 PM
    modelling, prediction model, sport, statistics
    • Replies: 0
    • Views: 1,203
    06-13-2013, 03:37 PM Go to last post
  23. Correlation

    I have a number of studies I am looking at and trying to compare their correlation coefficients ... esentially do a meta-analysis of correlation...

    Started by shanehall.m‎, 06-13-2013 01:32 PM
    correlation, correlation coefficients, meta analysis
    • Replies: 0
    • Views: 1,899
    06-13-2013, 01:32 PM Go to last post
  24. Thumbs up Validating the measurement method used in a study

    Hello all ! I'm doing my first study on my master degree level. I have designed a new measuring method. I should probably validate this...

    Started by Colo-manjaro‎, 06-10-2013 02:15 PM
    • Replies: 12
    • Views: 2,251
    06-13-2013, 01:19 PM Go to last post
  25. Uncertainty Analysis

    Hey guys. So I have a very broad, general question. I am fresh out of school and working my first job. I have been given a dataset and the regression...

    Started by belletire89‎, 06-13-2013 10:40 AM
    analysis, error, rstudio
    • Replies: 2
    • Views: 1,354
    06-13-2013, 12:25 PM Go to last post
  26. Post hoc comparisons. How to do the grouping?

    Hi all, Can anyone help me trying to understand how to do the grouping at the end of the post-hoc procedure in the one way ANOVA? For each kind of...

    Started by nelson85‎, 06-13-2013 11:48 AM
    • Replies: 0
    • Views: 1,172
    06-13-2013, 11:48 AM Go to last post
  27. conditional expected value with multivariate normal

    Suppose I have five random variables, x_1, x_2, a_1, a_2, and u. I know x_1 = a_1 + u and x_2 = a_2 + u. a_1, a_2, and u are all normally...

    Started by DanSchwab‎, 06-12-2013 11:32 AM
    • Replies: 2
    • Views: 2,027
    06-13-2013, 11:09 AM Go to last post
  28. Variable reduction- which method to use?

    I have a panel data set of 121 countries across 10 years and about 43 variables. In theory all the variables should be attempting to measure the same...

    Started by bolezy‎, 06-12-2013 11:37 AM
    principal component, stata, variable reduction
    • Replies: 2
    • Views: 2,717
    06-13-2013, 07:21 AM Go to last post
  29. Calculating effect size for generalized linear model?

    Hi, I have carried out a generalized linear model (in SPSS) with one dependent variable and two factors. Both factors have multiple categories...

    Started by bsrem‎, 06-13-2013 06:36 AM
    effect size, generalized linear model, gzlm
    • Replies: 0
    • Views: 3,968
    06-13-2013, 06:36 AM Go to last post
  30. Should you transform skewed data when the distribution is expected?

    Hi all, I have been discussing this topic all week with people in my department and I can't seem to get a straight answer. I was taught long ago...

    Started by joemama224‎, 06-03-2012 06:55 PM
    2 Pages
    1 2
    distribution, skew, transformation
    • Replies: 16
    • Views: 17,375
    06-12-2013, 07:29 PM Go to last post
  31. Metric to estimate the allowable error/noise in repeated measurments

    Hello, I perform two measurements of a variable once a week and I measured a 10.5% difference from week 1 to week 2. How can I tell if the...

    Started by Adelehony‎, 06-12-2013 07:24 PM
    • Replies: 0
    • Views: 1,213
    06-12-2013, 07:24 PM Go to last post
  32. Type 1 and type 2 error question, Confused need help thank you!

    got it solved thanks

    Started by tinytank32‎, 06-12-2013 03:18 PM
    • Replies: 2
    • Views: 2,365
    06-12-2013, 04:03 PM Go to last post
  33. P=0.05

    Hello I have a question. I am doing a hypothesis testing, and I get a p value of exactly 0.05. Do I reject the null hypothesis or not, assuming a...

    Started by Yankel‎, 06-12-2013 10:07 AM
    • Replies: 5
    • Views: 23,305
    06-12-2013, 12:33 PM Go to last post
  34. Sampling methods, which is more appropriate?

    I have been collecting data on the temperature in an experiment for the last couple months, and I'm interested in the rate of temperate changes. The...

    Started by Hans Rudel‎, 06-12-2013 05:01 AM
    sample, sample design, sample size
    • Replies: 1
    • Views: 2,346
    06-12-2013, 08:18 AM Go to last post
  35. Individual Item T Test Question

    Hi. I have a 18 item 5-point Likert type attitudinal pre-test and same 18 item post test. A group of 25 individuals completed a pretest then were...

    Started by ANXIETYPRONE‎, 06-11-2013 03:28 PM
    • Replies: 2
    • Views: 1,408
    06-12-2013, 04:16 AM Go to last post
  36. Question Interquartile Range

    What is the interquartile range of a normal distribution of IQ scores with a mean of 100 and a variance of 225? I think it is 20. I found out the...

    Started by Anniebell‎, 06-11-2013 06:51 PM
    • Replies: 2
    • Views: 1,853
    06-12-2013, 12:29 AM Go to last post
  37. Question How can i compute the following situation in R?

    Suppose that an urn contains a number of black and a number of white balls, and suppose that it is known that the ratio of the numbers is...

    Started by Jesmin‎, 06-11-2013 11:34 PM
    estimation, inference, programming
    • Replies: 1
    • Views: 1,259
    06-11-2013, 11:53 PM Go to last post
  38. Paradox in hypothesis testing ?

    Hi guys, I thought about something today and I am confused. P value is defined as the probability of seeing a test statistic as the one we saw...

    Started by Yankel‎, 06-11-2013 12:34 PM
    • Replies: 5
    • Views: 1,655
    06-11-2013, 11:16 PM Go to last post
  39. Parametric or non-parametric test ?

    Dear the members of group. I have 2 questions regarding my research which has 8 variables in which 6 of them are normally distributed and the rest...

    Started by Ahmad 2013‎, 06-10-2013 09:14 AM
    non parametric, parametric
    • Replies: 2
    • Views: 2,332
    06-11-2013, 10:28 PM Go to last post
  40. parameter estimation by MLE method

    Hi All I need to estimate two unknown parameters (lambda1 and lambda2) by using MLE. I know that they have normal distribution. h = g(lambda1 ,...

    Started by Ferra‎, 06-11-2013 05:20 PM
    mle, parameter estimation
    • Replies: 4
    • Views: 1,278
    06-11-2013, 06:14 PM Go to last post
  41. Weighted Least Squares through Origin

    Consider regression through the origin (i.e. straight line regression with population intercept known to be zero) with Var(ei | xi) = X2i * σ2. The...

    Started by simplemts‎, 06-11-2013 02:42 PM
    • Replies: 0
    • Views: 2,845
    06-11-2013, 02:42 PM Go to last post
  42. test for trend across groups

    Dear forum, I would be grateful for some help with a simple problem. I have some data arranged in 5 groups. Each group contains a single data...

    Started by tonytheviking‎, 06-11-2013 06:40 AM
    • Replies: 3
    • Views: 2,807
    06-11-2013, 12:53 PM Go to last post
  43. Bonferroni adjustment query

    Can anyone pls help me with the following dilemma: I have 3 different kinds of facilities: public facilities, private facilities and private...

    Started by omhjoshi‎, 06-11-2013 09:27 AM
    • Replies: 2
    • Views: 1,337
    06-11-2013, 11:59 AM Go to last post
  44. quasi-dependent sample t-test

    Hello all, I am doing a pre-post analysis of adherence to clinical measures. My pre and post groups have some identical individuals, but some...

    Started by tbone1‎, 06-10-2013 11:11 AM
    dependent samples, pre-post, t-test
    • Replies: 4
    • Views: 2,198
    06-11-2013, 07:08 AM Go to last post
  45. reliable change index and reliability coefficient

    Hi. I'm a bit embarrassed at my inability to figure this out even with the vast amounts of information available to me via the internet. Any help is...

    Started by sophisme‎, 06-10-2013 09:59 PM
    reliability, reliable change index, variance
    • Replies: 3
    • Views: 4,457
    06-11-2013, 03:00 AM Go to last post
  46. Statistical difference between vectors

    Hi, I am new to this forum and quite rusty in Statistics after university. Suppose I have M (> 100) number of companies, for each of them I...

    Started by Kuala‎, 06-10-2013 07:32 PM
    • Replies: 1
    • Views: 1,469
    06-11-2013, 02:17 AM Go to last post
  47. Help needed to understand co-variates and approp. tests for proposed research study

    I am currently working on a research proposal, and I am having a really hard time coming up with my data analysis section. Any help you could offer...

    Started by DiesboT‎, 06-10-2013 03:44 PM
    • Replies: 0
    • Views: 1,073
    06-10-2013, 03:44 PM Go to last post
  48. Selection of higher order and interaction terms

    Hello, I have about 1000 data points with three independent variables and one response. I believe the underlying function is a 3-dimensional...

    Started by kakala‎, 06-10-2013 08:22 AM
    • Replies: 0
    • Views: 926
    06-10-2013, 08:22 AM Go to last post
  49. Definition of absolute mean difference (application to Gini coefficient)

    Hello everyone, This is my first post at the forum. I've tried to find the answer but I couldn't (which may only mean that my searching abilities...

    Started by dakebusi‎, 06-10-2013 06:41 AM
    dispersion, gini, mean difference
    • Replies: 2
    • Views: 2,505
    06-10-2013, 08:06 AM Go to last post
  50. Question Ranking Method Comparison

    Hi, I have 15 items that need to be ranked from 1 to 15. I have two methods to do the ranking, method A and method B. Method A is where I have...

    Started by freddy‎, 06-10-2013 03:32 AM
    compare, methods, ranking
    • Replies: 2
    • Views: 1,995
    06-10-2013, 05:38 AM Go to last post
  51. standard error of measurement

    Hello I am not a stats expert and I need you help with calculating the standard error of each sample within a collection. For example: Let's...

    Started by DrBorrow‎, 06-07-2013 02:42 PM
    • Replies: 12
    • Views: 2,469
    06-10-2013, 12:51 AM Go to last post
  52. Example of mode question.

    If the population of movies that college students watch during the semester is normal shape with a mean of 40 and standard deviation of 10, what is...

    Started by happyguy55‎, 06-09-2013 11:58 AM
    help neded
    • Replies: 1
    • Views: 1,148
    06-09-2013, 12:47 PM Go to last post
  53. A question in methodology

    Good evening, I have a question about methodology, coz i do not know which way to go. For representing av results, I have used descriptive...

    Started by badibad‎, 06-08-2013 02:59 PM
    • Replies: 7
    • Views: 1,251
    06-09-2013, 04:03 AM Go to last post
  54. Construct Feature Vector

    Hi, I am doing a 10-fold cross validation on the training set of the data. I am trying to build a feature vector. I am doing my work in the R...

    Started by Harry1789‎, 06-08-2013 11:44 PM
    • Replies: 0
    • Views: 961
    06-08-2013, 11:44 PM Go to last post
  55. Variance of Slope for Linear Regression through the Origin

    Given y=b1*xi + ei.... Show Var(B^ | X) = (\sigma^2) / (\sumx^2i I am completely lost how this result differs from the standard var(b) with an...

    Started by simplemts‎, 06-08-2013 05:45 PM
    • Replies: 2
    • Views: 4,084
    06-08-2013, 10:49 PM Go to last post
  56. Survey Findings How to Use - help

    I have a dataset of items which use items from the GSS. My sample (N=300) was randomly drawn from 2000 respondents. They are a special population of...

    Started by DMCH‎, 06-08-2013 02:38 PM
    • Replies: 0
    • Views: 1,092
    06-08-2013, 02:38 PM Go to last post
  57. auto-regressive and polynomial models

    Hi, I am not a statistician and I want to use the pure auto-regressive (AR) model and/or the polynomial model to solve a prediction problem. I...

    Started by nahla‎, 06-08-2013 08:41 AM
    • Replies: 0
    • Views: 776
    06-08-2013, 08:41 AM Go to last post
  58. Exclamation Finding P-value...confusing

    The target length for a component is set at 30mm. A random sample of 25 components is selected and the lengths of each are recorded. The result is...

    Started by Hema‎, 06-08-2013 04:59 AM
    • Replies: 1
    • Views: 992
    06-08-2013, 08:10 AM Go to last post
  59. [non normal Multiple sample comparison] analysis and error bars for medians

    Dear all, Background: Treatment applied to 10 groups of different sizes. Each group treated with a different concentration. Groups 9 and 10 are...

    Started by mirror‎, 06-07-2013 07:15 AM
    • Replies: 0
    • Views: 1,252
    06-07-2013, 07:15 AM Go to last post
  60. Standard error calculation fails

    Hello all. I would really appreciate any help in solving this problem: There is an interesting article on funnel plots on the web:...

    Started by DrBorrow‎, 06-07-2013 05:28 AM
    standard error
    • Replies: 0
    • Views: 1,484
    06-07-2013, 05:28 AM Go to last post

+ Post New Thread

Thread Display Options

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Order threads in...

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

Contains unread posts
Contains unread posts
Contains no unread posts
Contains no unread posts
More than 15 replies or 300 views
Hot thread with unread posts
More than 15 replies or 300 views
Hot thread with no unread posts
Closed Thread
Thread is closed
Thread Contains a Message Written By You
You have posted in this thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts






Advertise on Talk Stats