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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: 196,608
    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: 66,642
    09-30-2005, 09:44 AM Go to last post
  1. 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: 3,095
    05-24-2015, 01:55 PM Go to last post
  2. 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: 1,175
    05-24-2015, 07:07 AM Go to last post
  3. 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: 2,125
    05-24-2015, 04:08 AM Go to last post
  4. 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: 1,777
    05-23-2015, 02:21 PM Go to last post
  5. 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: 1,471
    05-23-2015, 08:12 AM Go to last post
  6. 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: 1,178
    05-23-2015, 03:52 AM Go to last post
  7. [R] Nonparametric residuals for multiple regression. Timming, Bootstrapping, ranking?

    Hi, Iíve been looking through the forum and Google, but I canít find the answer. Iíll post my problem here. I got a dependent variable...

    Started by Saccharo‎, 05-21-2015 03:24 PM
    • Replies: 6
    • Views: 1,349
    05-22-2015, 10:34 PM Go to last post
  8. 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: 850
    05-22-2015, 08:05 AM Go to last post
  9. 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: 1,241
    05-22-2015, 01:49 AM Go to last post
  10. 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: 1,403
    05-21-2015, 02:29 PM Go to last post
  11. 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: 1,896
    05-21-2015, 01:37 PM Go to last post
  12. 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: 850
    05-21-2015, 12:52 PM Go to last post
  13. 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: 958
    05-21-2015, 06:43 AM Go to last post
  14. 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: 812
    05-21-2015, 03:14 AM Go to last post
  15. 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: 1,053
    05-21-2015, 02:32 AM Go to last post
  16. 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: 1,004
    05-20-2015, 04:37 PM Go to last post
  17. 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: 832
    05-20-2015, 04:31 AM Go to last post
  18. 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: 858
    05-20-2015, 01:56 AM Go to last post
  19. 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: 1,186
    05-19-2015, 02:49 PM Go to last post
  20. 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: 1,580
    05-19-2015, 08:05 AM Go to last post
  21. 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: 1,137
    05-19-2015, 05:44 AM Go to last post
  22. 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 JŁri‎, 05-19-2015 03:14 AM
    base category, log likelihood, multinomial logistic, reference category, regession
    • Replies: 1
    • Views: 1,236
    05-19-2015, 05:36 AM Go to last post
  23. 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: 923
    05-19-2015, 05:29 AM Go to last post
  24. 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: 783
    05-19-2015, 05:26 AM Go to last post
  25. 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
    • Replies: 0
    • Views: 1,103
    05-19-2015, 04:04 AM Go to last post
  26. 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: 1,197
    05-18-2015, 01:42 PM Go to last post
  27. 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: 1,213
    05-18-2015, 01:26 PM Go to last post
  28. 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: 1,480
    05-18-2015, 08:01 AM Go to last post
  29. 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: 1,074
    05-18-2015, 03:52 AM Go to last post
  30. 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: 782
    05-17-2015, 07:09 PM Go to last post
  31. 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
    • Replies: 0
    • Views: 1,125
    05-17-2015, 02:36 PM Go to last post
  32. 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: 1,198
    05-17-2015, 02:02 PM Go to last post
  33. 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: 827
    05-17-2015, 01:18 PM Go to last post
  34. 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: 1,048
    05-17-2015, 11:40 AM Go to last post
  35. 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 04:53 PM
    central limit theorem, clt, sample size
    • Replies: 3
    • Views: 1,730
    05-17-2015, 07:34 AM Go to last post
  36. 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: 1,279
    05-17-2015, 06:59 AM Go to last post
  37. Confusion over two different uses of r squared

    Iím a retired civil engineer who has recently taken up self-instruction in basic statistics. While investigating the curve-fitting procedures used...

    Started by Dave4449‎, 05-15-2015 08:26 PM
    • Replies: 3
    • Views: 1,523
    05-17-2015, 12:48 AM Go to last post
  38. Is here a moderation (when b coefficients are nonsignificant)?

    I am trying to check if the relationship between X and Y is a moderated by M. Model is: Y = X + XX + M + XM + XXM X - independable, M -...

    Started by Jotalin‎, 05-16-2015 05:49 AM
    coefficients, interaction, moderation, regression coefficients
    • Replies: 1
    • Views: 801
    05-16-2015, 11:40 AM Go to last post
  39. What dF to report for blocked ANOVA?

    So, I need to report my F-statistic and wanted to check in to make sure that I'm going to report the right degrees of freedom. My ANOVA table has 4...

    Started by srpang89‎, 05-12-2015 09:45 PM
    • Replies: 5
    • Views: 1,715
    05-15-2015, 01:03 PM Go to last post
  40. Grouped Median Computation Process (Class Median within falls within first interval)

    Hello! I am a taking up an introductory course to statistics and am stuck on this problem. I have tried searching online and through three textbooks...

    Started by EdwardDatu‎, 05-15-2015 05:43 AM
    grouped median formula
    • Replies: 0
    • Views: 977
    05-15-2015, 05:43 AM Go to last post
  41. Discrete vs Continuous time series models

    What is the difference between discrete and continuous time series models? It will be great help for me someone can give me some examples for...

    Started by Chirantha89‎, 05-14-2015 11:49 PM
    timeseries analysis
    • Replies: 0
    • Views: 2,553
    05-14-2015, 11:49 PM Go to last post
  42. probability plot analysis

    Hey guys. Would you say this probability plot shows normal distribution? I thought it did, because they all pretty much follow the line, or is...

    Started by computron9000‎, 05-14-2015 05:43 PM
    • Replies: 3
    • Views: 1,165
    05-14-2015, 09:04 PM Go to last post
  43. Need help with study design and analysis

    Please refer to updated post.

    Started by professorzoom‎, 05-14-2015 08:46 PM
    • Replies: 0
    • Views: 1,080
    05-14-2015, 08:46 PM Go to last post
  44. Which test can I use here?

    I have two different groups, measured over time, continuous variable, two different treatments. I know there is a significant change in both...

    Started by chas0039‎, 05-13-2015 04:58 PM
    choose test
    • Replies: 8
    • Views: 1,302
    05-14-2015, 03:48 PM Go to last post
  45. Can correlation be used as a measure of accuracy?

    I have a paired data set of known age and estimated age, and correlation tests show that there is a strong correlation between the two, but what I...

    Started by LianeSF‎, 05-13-2015 08:51 AM
    accuracy, correlation, pearsons correlation, spearmans rank
    • Replies: 7
    • Views: 1,776
    05-14-2015, 10:40 AM Go to last post
  46. Struggling with R multiple linear regression model - please help

    I am trying to model a set of variables and I am really struggling. Unfortunately, I am now up against a deadline and you guys are my last hope. I...

    Started by CalBerkJohn‎, 05-14-2015 06:07 AM
    • Replies: 2
    • Views: 1,282
    05-14-2015, 08:12 AM Go to last post
  47. Question F- Value to T- value in an ANOVA test

    So i did a minitab ANOVA test, it spat out a F-Value. A question in an assignment needs me to give them a t-statistic. Can i use this F-value...

    Started by computron9000‎, 05-13-2015 09:01 PM
    • Replies: 3
    • Views: 1,463
    05-13-2015, 10:15 PM Go to last post
  48. Exclamation Confidence intervals with a skewed histogram

    If a histogram is skewed right, does that give us any concern about the validity of a calculated confidence interval?

    Started by computron9000‎, 05-13-2015 06:38 PM
    • Replies: 5
    • Views: 4,568
    05-13-2015, 09:39 PM Go to last post
  49. Write Likelihood function

    HOw to write likelihood and log-likelihood of this bivariate distribution? Thank You! $Y|X = x ~ N(0,\lambdax^2)$ $ X ~ N(0,\sigma^2)$ con ...

    Started by Dravipo‎, 05-08-2015 05:57 PM
    • Replies: 1
    • Views: 1,289
    05-13-2015, 07:45 PM Go to last post
  50. How would I compare two samples with independent variables not using a t-test?

    Hi Guys This is my first post, and I am not fantastic with stats so please stick with me. Is there a way that I can statistically say if two...

    Started by JamesWilliams90‎, 05-13-2015 01:13 PM
    • Replies: 2
    • Views: 1,148
    05-13-2015, 01:48 PM Go to last post
  51. Combining standard deviation of percentages

    I have a sample set for which I've determined the percent inhibition (1 - test sample / control sample). There is error inherent with each sample set...

    Started by swammi‎, 05-13-2015 11:21 AM
    combining uncertainty
    • Replies: 0
    • Views: 1,533
    05-13-2015, 11:21 AM Go to last post
  52. optimum number of strata in cox regression

    Hi all, Is there any advice on the maximum number of strata for a stratified cox regression ? In a study I have to analyze, the total sample...

    Started by statter‎, 04-22-2015 05:31 AM
    • Replies: 7
    • Views: 1,563
    05-13-2015, 10:49 AM Go to last post
  53. Medical Statistics: Comparison of diagnostic accuracy studies

    Hello: I require assistance I have a population of patients undergoing two different diagnostic tests. I have already tabulated the...

    Started by SpaceTofu‎, 05-05-2015 11:55 AM
    • Replies: 6
    • Views: 1,740
    05-13-2015, 10:36 AM Go to last post
  54. Comparison of large dataset

    Dear statisticians, I have ran an experiment which gave me information about the fluorescence intensity of 10.000 cells. I have repeated the...

    Started by Cytometer‎, 05-13-2015 04:37 AM
    • Replies: 0
    • Views: 1,032
    05-13-2015, 04:37 AM Go to last post
  55. How to compare size distributions between 3 areas

    I'm trying to figure out the best test to compare size distributions of crabs caught in three different areas. I binned the data in size classes...

    Started by Biology‎, 05-12-2015 05:50 PM
    • Replies: 2
    • Views: 1,167
    05-13-2015, 02:55 AM Go to last post
  56. Irregular Time Series Analysis

    How to analyse a irregular time series? Should I convert it to a regular time series? I have daily prices of a product. But the prices are not...

    Started by Chirantha89‎, 05-12-2015 11:47 PM
    • Replies: 0
    • Views: 2,026
    05-12-2015, 11:47 PM Go to last post
  57. Finding the mean value when there is a trend in the dataset

    I have a large data set. I want to get a representative value for this data set. So I calculated mean value for the data set. But there is a trend in...

    Started by Chirantha89‎, 05-11-2015 10:33 PM
    • Replies: 2
    • Views: 980
    05-12-2015, 11:37 PM Go to last post
  58. Comparing percentages - Which test is the most suitable?

    Hi Following advice received from an earlier posting, I have simplified the data I am analysing, and would like to check that I have made the...

    Started by DeeD‎, 05-12-2015 04:08 AM
    • Replies: 3
    • Views: 1,566
    05-12-2015, 01:35 PM Go to last post
  59. Randomized Complete Block Design (question about my design)

    Hello all- this is my first post on this lovely looking forum. This may be an advanced question! I would very much be grateful for any help. I...

    Started by agraham1‎, 05-11-2015 08:52 PM
    • Replies: 5
    • Views: 2,149
    05-12-2015, 12:19 PM Go to last post
  60. Comparing variability of several independetly time series

    To compare several independently distributed time series, I decided to take a compare their coefficient of variations. Is there any better way to...

    Started by CyrusMMX‎, 05-12-2015 09:56 AM
    comparison, time series, variability
    • Replies: 0
    • Views: 964
    05-12-2015, 09:56 AM Go to last post

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