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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: 96,940
    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: 29,179
    09-30-2005, 09:44 AM Go to last post
  1. T-test - dependent samples? repeated measures?

    Hello, I'm working with biological data that was sampled over different days. Because of the methods, it's likely that a minority of the data points...

    Started by Qroid‎, Today 10:56 AM
    • Replies: 0
    • Views: 1
    Today, 10:56 AM Go to last post
  2. Different significance results when table transposed?

    Following the example given in a Surveymonkey blog post, https://www.surveymonkey.com/blog/105/02/9/statistical-significance-see-close-truth/ I...

    Started by sysmod‎, 05-25-2015 05:39 AM
    • Replies: 3
    • Views: 112
    Today, 10:25 AM Go to last post
  3. Differences in the p value from t-test and post hoc tests after ANOVA

    Hello! I would like an explanation with differences regarding the p value which i observed when i perform t-test and post hoc tests. I have to...

    Started by vasmour‎, Today 05:33 AM
    • Replies: 4
    • Views: 77
    Today, 09:22 AM Go to last post
  4. Thumbs up Want to know Expression of t.test

    There is a function t.test in R , i want to know the expression of t.test function; how can i know it. Example : We have simple "mean" function in R...

    Started by sajalgoel‎, 05-13-2015 08:26 AM
    • Replies: 11
    • Views: 242
    Today, 08:12 AM Go to last post
  5. Question Looking for help with the Mann-Whitney U Test

    Hey, I'm a highschool student finishing up with AP Statistics. In my final project, I am using the Mann-Whitney U Test to compare two un-normal data...

    Started by S^4‎, Yesterday 03:54 PM
    ap stats, data, help needed, mann-whitney, u-test
    • Replies: 2
    • Views: 97
    Today, 07:55 AM Go to last post
  6. Find Standard Deviation/ Standard Error for an unusual trend

    Hi everyone. Got a bit issues in this , hope if anyone can give me any suggestion on how to find the Standard Deviation/ Standard Error in this...

    Started by risingstar3110‎, Today 02:25 AM
    • Replies: 0
    • Views: 37
    Today, 02:25 AM Go to last post
  7. Question software speed

    Not homework BTW ... I want to measure the processing time (performance) of some software under a set of fixed conditions. I have a means to log the...

    Started by MikeMulligan‎, 05-26-2015 05:03 PM
    analysis, correlation, performance, single factor, software
    • Replies: 7
    • Views: 158
    Yesterday, 08:44 PM Go to last post
  8. Unequal sample sizes

    Hi all, I would like to compare the means of two groups, one group has 6 samples and the other has 4 samples, can I used a unpaired t-test or...

    Started by Roton‎, Yesterday 03:20 PM
    • Replies: 1
    • Views: 105
    Yesterday, 08:07 PM Go to last post
  9. Question about "nesting" in sas

    Hi there, I am a new guy for SAS. I have a question about "nesting" in SAS. If A is nested in B and B is nested in C, how to coding the random...

    Started by yzdu‎, Yesterday 04:15 PM
    • Replies: 1
    • Views: 66
    Yesterday, 07:51 PM Go to last post
  10. Pearson's, Spearman's and R squared

    Hi, I'm sure this is super easy but I can't seem to find the answer anywhere. I am looking at the linear relationship between height (cm) and...

    Started by jteighty‎, Yesterday 12:26 PM
    • Replies: 2
    • Views: 73
    Yesterday, 01:52 PM Go to last post
  11. Paired t-test and control variables?

    Hey :) So I have the following data: 160 participants filled out a survey in which the first rated one product, then another. Now I want to...

    Started by KattyTapatia‎, Yesterday 11:11 AM
    • Replies: 2
    • Views: 95
    Yesterday, 01:44 PM Go to last post
  12. Which test should I use?

    I have been trying to find the test that I can use to analyze my data, but I'm not sure if I'm heading in the right direction. There are total of...

    Started by Winter10‎, Yesterday 01:53 AM
    • Replies: 2
    • Views: 104
    Yesterday, 10:46 AM Go to last post
  13. What F value stands for in ANOVA analysis?

    Hi everyone, When I do ANOVA test, I notice in the output many values among them P, F values. Could somebody please tell me what F value in...

    Started by statser‎, 03-02-2009 04:08 AM
    • Replies: 11
    • Views: 234,270
    Yesterday, 08:09 AM Go to last post
  14. Splitting a vector into groups using R

    I have some values in a vector. Now I want to divide those values into groups as follows and I want to store them under new variables. ...

    Started by Chirantha89‎, Yesterday 06:47 AM
    • Replies: 0
    • Views: 49
    Yesterday, 06:47 AM Go to last post
  15. Combination of two sample t-test and paired t-test versus MANOVA

    Hello! I'm conducting a study where I compare one design with another. For my experiment I have also used a control and a treatment group, and I'm...

    Started by al3xis‎, 05-23-2015 02:06 PM
    • Replies: 3
    • Views: 148
    Yesterday, 03:57 AM Go to last post
  16. Question on data representation using Box plots

    I had a question about representing data using boxplots. I have a box plot for change in distance for a marker which is calculated every 100...

    Started by Rachit‎, 05-26-2015 12:05 PM
    • Replies: 0
    • Views: 81
    05-26-2015, 12:05 PM Go to last post
  17. Question Exponential Regression to Forecast Future Growth

    Hi, I'm a C# programmer and am not a math major. I have a programming problem that I am trying to solve and hope that someone here can help me solve...

    Started by jkruer01‎, 05-26-2015 11:38 AM
    exponential, linear, regression
    • Replies: 0
    • Views: 55
    05-26-2015, 11:38 AM Go to last post
  18. Restricted maximum likelihood (REML)

    Hello everyone, For my Bachelor's thesis I have to estimate an overall mean and standard deviations using the restricted maximum likelihood (REML)...

    Started by Appeltaart‎, 05-26-2015 08:44 AM
    • Replies: 0
    • Views: 60
    05-26-2015, 08:44 AM Go to last post
  19. Help understaning results for stats novice

    Hi all, Attached is an excel worksheet with some basic stats that I need help interpreting and to find out if I have done it correctly. I have...

    Started by demarc‎, 05-25-2015 10:13 PM
    • Replies: 0
    • Views: 87
    05-25-2015, 10:13 PM Go to last post
  20. How to combine data sets to do a pearson correlation

    Hi, I want to calculate the pearson correlation between 2 variables, namely the expression level of 2 genes measured in biological samples. The...

    Started by Nic73‎, 05-25-2015 11:13 AM
    combine data sets, pearson correlation
    • Replies: 0
    • Views: 108
    05-25-2015, 11:13 AM Go to last post
  21. re: Why is a almost equal 1 odd ratio resulted in a statistical different in groups?

    Hello, I have a question related to odd ratio and statistical significant that I'd like to get your help. I have two groups A and B . Its odd...

    Started by minhdung711‎, 05-13-2015 02:54 PM
    odd ratio and p value
    • Replies: 4
    • Views: 209
    05-25-2015, 10:10 AM Go to last post
  22. Plot ANCOVA values

    Dear all, I conducted the following mixed ANOVA with covariate: WS factor = item type BS factor = group covariate = IQ dependent variable =...

    Started by qwertz1899‎, 05-25-2015 04:21 AM
    • Replies: 0
    • Views: 87
    05-25-2015, 04:21 AM Go to last post
  23. score

    The following are the socres made by batsman A and B in series of innings A = 28 22 46 85 9 59 175 42 11 99 B = 52 18 4 95 125 12 90 58 7 76 ...

    Started by shona khan‎, 05-24-2015 10:39 PM
    scores
    • Replies: 0
    • Views: 63
    05-24-2015, 10:39 PM Go to last post
  24. Exclamation Help Needed Urgently Regrading Standard Deviation

    Hi, I want to ask you a problem So i am investigating a the relationship between being left handed or right handed and income earned. Lets say left...

    Started by bruby18‎, 05-21-2015 09:49 AM
    • Replies: 4
    • Views: 168
    05-24-2015, 04:42 PM Go to last post
  25. Covariance of two products

    Covariance of two products I am in a stats class and the professor has asked us to calculate the covariance and the standard deviation of the...

    Started by tlitterio‎, 05-24-2015 01:55 PM
    covariance, standard deviation
    • Replies: 0
    • Views: 1,032
    05-24-2015, 01:55 PM Go to last post
  26. In need of interpretation assistance

    Hey! I*m a bit new to statistics and in my thesis I have gotten a lot of help from a professor on the institution. I have felt on board with it on...

    Started by Iateyourbananas‎, 05-24-2015 07:07 AM
    • Replies: 0
    • Views: 83
    05-24-2015, 07:07 AM Go to last post
  27. Smile Person mean substitution

    Recently, i am trying to impute item missing data with person mean approach (mean substitution across items within an individual). Did anyone use...

    Started by Springer251‎, 05-14-2015 11:50 PM
    • Replies: 1
    • Views: 124
    05-24-2015, 04:08 AM Go to last post
  28. Question Statistical Indicators

    Could someone please tell me the indicators for: Prevalence of Poverty (for people living with less than x$ a month) and Depth of Poverty (meant...

    Started by DelftBlue‎, 05-23-2015 02:21 PM
    indicators, poverty, spss
    • Replies: 0
    • Views: 105
    05-23-2015, 02:21 PM Go to last post
  29. Dividing, substracting STANDARD DEVIATION

    Hello, I have the following problem: From the data, I can calculate AVERAGE and SD for the variable y. I have to calculate AVERAGE and SD for x =...

    Started by GiorgioArmani‎, 05-23-2015 08:12 AM
    • Replies: 0
    • Views: 102
    05-23-2015, 08:12 AM Go to last post
  30. Hypothesis testing for multiple regression including dummy variables

    Hey all, So if the regression was Income = B0 + B1 Age + B2 Education + B3 Male + B4 Asia + B5 Europe etc. where Male is a dummy variable for...

    Started by teemo‎, 05-23-2015 03:34 AM
    • Replies: 1
    • Views: 102
    05-23-2015, 03:52 AM Go to last post
  31. [R] Nonparametric residuals for multiple regression. Timming, Bootstrapping, ranking?

    Hi, I’ve been looking through the forum and Google, but I can’t find the answer. I’ll post my problem here. I got a dependent variable...

    Started by Saccharo‎, 05-21-2015 03:24 PM
    • Replies: 6
    • Views: 168
    05-22-2015, 10:34 PM Go to last post
  32. Calibration external model

    Hi, I want to perform a calibration in STATA on a predictive model from an external source. I have var1 that contains probailities and var2 that...

    Started by jjvk‎, 05-22-2015 08:05 AM
    calibration external
    • Replies: 0
    • Views: 93
    05-22-2015, 08:05 AM Go to last post
  33. Date function in R

    I have some dates in an array. eg:-x<-c(2015-04-05, 2015-04-25, 2015-05-01, 2015-05-15) If a given date is equal to a date within this array, I...

    Started by Chirantha89‎, 05-21-2015 10:49 PM
    • Replies: 2
    • Views: 141
    05-22-2015, 01:49 AM Go to last post
  34. Thumbs up Predicting what disease a person will be prone to

    PersonName Disease1 Disease2 Disease3 TopDisease Disease Next week *** 4 2 0 4 ...

    Started by pratiyaksh‎, 05-21-2015 01:03 PM
    • Replies: 1
    • Views: 94
    05-21-2015, 02:29 PM Go to last post
  35. ANOVA for temporal factor data - Data thinning to avoid autocorrelation/dependence?

    Hi all I am conducting an analysis to assess the temporal occurrence of a species of whale in our survey area at different time scales using...

    Started by KCG‎, 05-21-2015 01:37 PM
    anova assumption, independence, serial autocorrelation, temporal autocorrelation
    • Replies: 0
    • Views: 103
    05-21-2015, 01:37 PM Go to last post
  36. Need help in a problem

    Hi, I'm 4th year Uni student in Maths and statistics and I'm stuck on a problem. Maybe someone can kindly explain, please. Using Matlab or R...

    Started by velly‎, 05-21-2015 12:52 PM
    • Replies: 0
    • Views: 57
    05-21-2015, 12:52 PM Go to last post
  37. Exclamation HELP! What's a two-sided hypothesis?!

    One of my assignment questions is the following: Perform a two-sided hypothesis test to test the equality of the variances of the sorption rates...

    Started by bozatron‎, 05-21-2015 02:22 AM
    • Replies: 1
    • Views: 102
    05-21-2015, 06:43 AM Go to last post
  38. Post Data preparation: Turn factors into variables

    Hello! I am doing my master thesis on cross-device conversion in an e-commerce setting. I have a dataset from Google AdWords that looks like this...

    Started by Charlotte010‎, 05-21-2015 03:14 AM
    • Replies: 0
    • Views: 92
    05-21-2015, 03:14 AM Go to last post
  39. Chi-Sq Std Residuals

    I am looking at the standardized residuals from Chi^2. So they say if it they are large or small via z-scores then it can be significantly...

    Started by hlsmith‎, 05-08-2015 04:04 PM
    • Replies: 2
    • Views: 178
    05-21-2015, 02:32 AM Go to last post
  40. Hey! Could you guide me in the right direction please? It's about estimating AMOUNTS

    So I know that if I was to estimate, say, the mean wages of a city, I'd get a random sample and get the mean wage of them, and then extrapolate to...

    Started by TheMonk‎, 05-20-2015 04:37 PM
    • Replies: 0
    • Views: 116
    05-20-2015, 04:37 PM Go to last post
  41. error correction model

    Hi, Could anyone give me the code for error correction model, please? I learned, how to apply both steps in "two-stage approach", but who should...

    Started by Lubomir‎, 05-20-2015 04:31 AM
    cointegration, error correction
    • Replies: 0
    • Views: 118
    05-20-2015, 04:31 AM Go to last post
  42. A question in Statistics.

    Can someone help me with this problem? It's file attachment below.

    Started by vodanh_123‎, 05-20-2015 01:56 AM
    • Replies: 0
    • Views: 151
    05-20-2015, 01:56 AM Go to last post
  43. Statisitical method to assess the competency of an individual?

    I will summarise my problem first. I want to write a platform for reviewing doctors in a country. The names of doctors will be added by the users...

    Started by ajjitchandran‎, 05-18-2015 12:46 AM
    ranking a professional
    • Replies: 1
    • Views: 149
    05-19-2015, 02:49 PM Go to last post
  44. Relationship between correlations

    Hi, I am trying to figure out the relationship between correlations of variables where one of the variables defined as the difference between two...

    Started by oracle133‎, 05-15-2015 06:33 AM
    • Replies: 3
    • Views: 277
    05-19-2015, 08:05 AM Go to last post
  45. Software Advice

    Hello, Very happy to have found this forum! I was wondering if I could get some advice on what software I could use to anaylse relationship...

    Started by Percy‎, 05-19-2015 05:44 AM
    • Replies: 0
    • Views: 128
    05-19-2015, 05:44 AM Go to last post
  46. Reference category in multinomial logistic regression

    Hello! My question concerns the effect of base category on the estimates of multinomial logistic regression. Does the choice of reference category...

    Started by Jüri‎, 05-19-2015 03:14 AM
    base category, log likelihood, multinomial logistic, reference category, regession
    • Replies: 1
    • Views: 71
    05-19-2015, 05:36 AM Go to last post
  47. R interpretation

    Hey guys Really simple question, I am generating ARIMA models via auto.arima and R lists some as INF. I am confused on what INF stands for....

    Started by statman1999‎, 05-19-2015 03:36 AM
    • Replies: 1
    • Views: 79
    05-19-2015, 05:29 AM Go to last post
  48. Kruskall-Wallis/Dunn or Mann-Whitney to compare communities along an area?

    Hi, I would like to know your opinion about the best statistical approach to use in the following case: - 10 sampling points distributed along an...

    Started by GSousa‎, 05-19-2015 05:26 AM
    • Replies: 0
    • Views: 117
    05-19-2015, 05:26 AM Go to last post
  49. Exclamation Probability of sample test

    I am struggling to understand this: first I have read the theory of discrete and continues random variable, and distributions. where an outcome is...

    Started by iochoa‎, 05-19-2015 04:04 AM
    probability
    • Replies: 0
    • Views: 130
    05-19-2015, 04:04 AM Go to last post
  50. Group project using Chi-Square Method to Solve......

    Hello all, Our group has decided to test a hypothesis for the "National Traffic Safety Board" to see if gender affects the decision of...

    Started by Castillb‎, 05-18-2015 12:38 PM
    • Replies: 3
    • Views: 143
    05-18-2015, 01:42 PM Go to last post
  51. Dart Throwing

    Hi, I have a statistical problem which, hopefully, you can help me with ? Assume a number of dart players endeavour to hit the bullseye with...

    Started by nodrog2452‎, 05-18-2015 01:26 PM
    • Replies: 0
    • Views: 109
    05-18-2015, 01:26 PM Go to last post
  52. Sampling, sampling frame and contacting all in the sampling frame

    Hello, As a part of my thesis, I would ideally like to run a survey on all students that have completed a particular training. The training has...

    Started by deca‎, 05-12-2015 04:45 AM
    • Replies: 5
    • Views: 230
    05-18-2015, 08:01 AM Go to last post
  53. Question Getting pdf of X given the moments

    Please help me with the following question. m2 = E(X^2) = 1 m4 = E(X^4) = 3 m6 = E(X^6) = 9 Find all possible distributions of X.

    Started by kapil.aggr‎, 05-15-2015 05:45 AM
    distribution function, moments
    • Replies: 5
    • Views: 216
    05-18-2015, 03:52 AM Go to last post
  54. Cool Centered 12-point moving mean.

    For a centred 12-point moving mean, am i correct in thinking i take the 5 values from either side of X, and divide the edge two /2? eg. A =...

    Started by computron9000‎, 05-17-2015 07:09 PM
    • Replies: 0
    • Views: 122
    05-17-2015, 07:09 PM Go to last post
  55. Repeated-measures chi-square test in SPSS

    Here's my (fairly simple?) question: I have three binary variables, call them A, B, and C. I want to see if the effect of A on B is different than...

    Started by dyudkin‎, 05-17-2015 02:36 PM
    chi-square
    • Replies: 0
    • Views: 137
    05-17-2015, 02:36 PM Go to last post
  56. Choosing between parametric, non-parametric, semi parametric

    For an assignment I have to fit the best model to my data. The first step is to decide to which family it belongs to. My y variable is binomial...

    Started by Artreides‎, 05-17-2015 04:01 AM
    • Replies: 2
    • Views: 139
    05-17-2015, 02:02 PM Go to last post
  57. I'm New, HELP! How to analysis Mediator in SPSS

    Hi I'm new, i need some help for my research methodology coursework. currently i facing some problem about my theoretical framework. my research...

    Started by lam‎, 05-16-2015 11:35 PM
    • Replies: 2
    • Views: 125
    05-17-2015, 01:18 PM Go to last post
  58. Question how to measure change in performance ? Using regression model ? HELP

    Hi everyone, I have to measure the difference of the performance of firms before and after an event. Let's say the performance at (event -...

    Started by jojoterrible‎, 05-17-2015 11:40 AM
    change model, performance, regression
    • Replies: 0
    • Views: 128
    05-17-2015, 11:40 AM Go to last post
  59. Central limit theorem effect of number of samples vs sample size

    Hey guys, For an assignment I've been asked to investigate the CLT when sampling from different distributions using different sample sizes. Do to...

    Started by lken‎, 02-16-2015 03:53 PM
    central limit theorem, clt, sample size
    • Replies: 3
    • Views: 370
    05-17-2015, 07:34 AM Go to last post
  60. Is weighing cases allowed/necessary for the Kruskal-Wallis and its post-hoc tests?

    I have a dataset where I have respondents from 3 different countries (USA, NL & DE) and use the Kruskal-Wallis to determine if there are any...

    Started by MaclBB‎, 05-17-2015 06:59 AM
    • Replies: 0
    • Views: 145
    05-17-2015, 06:59 AM Go to last post

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