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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  1. 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: 66,594
    09-30-2005, 09:44 AM Go to last post
  2. 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: 196,509
    07-16-2014, 11:01 AM Go to last post
  1. umvu estimator

    Let x1,x2,…,xn be a random sample from a poisson distribution with mean θ Find umvu estimator log(1+θ)

    Started by hadiSanji‎, 06-16-2010 08:43 AM
    • Replies: 2
    • Views: 4,859
    06-16-2010, 12:30 PM Go to last post
  2. Mle

    I am Hadi Sanji of university ferdowsi of iran. I have a problem about MLE . please guide me. Question : Let x_1, x_2,…, x_n be a random sample...

    Started by hadiSanji‎, 06-19-2010 12:56 PM
    • Replies: 1
    • Views: 2,333
    06-19-2010, 01:29 PM Go to last post
  3. unbiased confidence interval

    Hi let x1,x2,...,xn be a random sample from distribution in under function distribution . F(x)=^β , 0≤x<θ where β is unknown and θ is known find a...

    Started by hadiSanji‎, 12-20-2011 03:54 AM
    statistic
    • Replies: 2
    • Views: 3,271
    12-20-2011, 10:47 AM Go to last post
  4. Unsure on how to plot data..

    We are doing an experiment in our lab, and it's fairly simple: we take five randomly selected rubberbands, and shoot each of them the same five...

    Started by hadlerstate‎, 04-14-2013 07:42 PM
    • Replies: 0
    • Views: 1,015
    04-14-2013, 07:42 PM Go to last post
  5. Spearmans rho spss question

    Hi A student has asked me the following question, although it seems simple it's ages since I've done anything correlational, so I would appreciate...

    Started by Haflinger‎, 03-04-2009 08:25 AM
    • Replies: 0
    • Views: 2,370
    03-04-2009, 08:25 AM Go to last post
  6. comparing two groups multiple datapoints for one parameter - how?

    Hello, I have the following problem (example): I want to compare the size of apples for two sorts of apple trees. So I measure the diameter of...

    Started by Hagen‎, 01-30-2013 12:57 PM
    • Replies: 0
    • Views: 948
    01-30-2013, 12:57 PM Go to last post
  7. Slovin's Formula

    Who invented/formulated it? I already have done some research and all the results wasn't clear enough. I found one which states that Yamane's...

    Started by haharz‎, 02-02-2012 01:19 AM
    • Replies: 2
    • Views: 3,568
    06-19-2015, 04:43 PM Go to last post
  8. Newbie: Statistic help

    Hello everyone, I reacenly found this forum while surfing google. Actually I need some help with my statistics work. I dont know how to...

    Started by haider99‎, 06-02-2010 12:32 PM
    • Replies: 2
    • Views: 2,472
    06-02-2010, 01:44 PM Go to last post
  9. My Textbook sucks, Can some one help me with this question.

    Exactly from the book A distribution of numbers is approximately bell shaped. If the mean of the numbers is 125 and the standard deviation in 12,...

    Started by haider99‎, 06-07-2010 07:28 PM
    • Replies: 3
    • Views: 5,752
    06-08-2010, 10:41 AM Go to last post
  10. Question Min sample size for Wilcoxon Rank Sum test

    Hi, I have data measurements (eg, running cost) that keep coming in to the system continuously. There are two groups (say X and Y) that I want to...

    Started by hajjat‎, 08-21-2013 07:07 AM
    power analysis, sample size, sample size determination, wilcoxon rank sum test
    • Replies: 5
    • Views: 7,723
    08-22-2013, 01:00 PM Go to last post
  11. Smile nominal (yes/no) and distance. What test to use to proof correlation?

    Hi all, My boss has a list that shows the interest of people for a new venue (interest? Answer: yes or no) and the distance to that possible...

    Started by Hajo‎, 04-20-2016 12:03 PM
    correlation
    • Replies: 5
    • Views: 1,128
    04-21-2016, 08:48 AM Go to last post
  12. How to get from Confidence Interval to Percent Confidence Interval?

    Thank you for your time with this... This is in relation to a stratified random sample. I have the confidence interval expressed as a range of...

    Started by Halcie86‎, 08-02-2014 02:11 PM
    • Replies: 0
    • Views: 1,201
    08-02-2014, 02:11 PM Go to last post
  13. 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: 1,231
    07-15-2014, 09:02 AM Go to last post
  14. 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: 2,042
    07-15-2014, 10:24 AM Go to last post
  15. Thumbs up Help with the normal distribution using R

    Hi! We are total statistics and R-newbies, and we're having some difficulties with our data that we hope some of you might be able to help us...

    Started by haldelberg‎, 06-24-2014 07:55 AM
    anova, normal distribution, t-test
    • Replies: 2
    • Views: 1,444
    06-25-2014, 05:58 AM Go to last post
  16. 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: 827
    07-17-2014, 09:07 AM Go to last post
  17. 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: 2
    • Views: 1,625
    08-13-2014, 07:31 AM Go to last post
  18. Help with t-test and multiple variables

    Hello We are working with a large set of data from pigs at slaughter in R. We have info on the gender of pigs and of the occurrence of specific...

    Started by haldelberg‎, 07-11-2014 12:06 PM
    • Replies: 2
    • Views: 1,493
    07-11-2014, 03:04 PM Go to last post
  19. 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: 1,317
    07-23-2014, 04:04 AM Go to last post
  20. Fit of generalized linear model (Poisson distribution)

    Hi guys Can anyone tell us how to evaluate the fit of our generalized linear model with a poisson distribution? We can't really tell if the model...

    Started by haldelberg‎, 09-02-2014 09:38 AM
    glm, goodness of fit, poisson
    • Replies: 1
    • Views: 1,596
    09-02-2014, 12:27 PM Go to last post
  21. How to analyse deviance (GLM in R)

    Hi! This might be quite basic, but how do I analyse the fit of my GLM from the deviance? In the summary of my model, I get a deviance of 140.1...

    Started by haldelberg‎, 09-03-2014 03:06 AM
    deviance, glm, goodness of fit
    • Replies: 0
    • Views: 1,857
    09-03-2014, 03:06 AM Go to last post
  22. Reliability of a questionnaire

    Hi everybody, I have a problem with the reliability of my questionnaire (5-point Likert scale). I constructed 5 subscales for my questionnaire....

    Started by Haley‎, 02-02-2009 11:31 AM
    • Replies: 1
    • Views: 2,764
    02-25-2011, 10:23 AM Go to last post
  23. Hypothesis test help.

    The temperature in degrees Fahrenheit of a random group of healthy adults are 97.0 97.4 99.3 97.7 98.6 99.7 97.5 98.7 96.9 97.9 97.3 ...

    Started by HaleyLee‎, 03-06-2015 03:34 PM
    hypothesis test, sign test
    • Replies: 1
    • Views: 1,228
    03-06-2015, 04:46 PM Go to last post
  24. population proportions...

    Hello, Suppose you have a problem to solve in which 71% of Internet users connect using standard telephone lines. The population proportion is...

    Started by half-life‎, 05-21-2006 04:08 PM
    • Replies: 3
    • Views: 1,790
    05-21-2006, 10:11 PM Go to last post
  25. I'm so lost on population variances!!

    Hello, Suppose a company is making a product. They want a maximum variance of .0001 inches. Assume a sample size of 15 products has a standard...

    Started by half-life‎, 06-13-2006 08:55 PM
    • Replies: 0
    • Views: 1,900
    06-13-2006, 08:55 PM Go to last post
  26. How to present stat from Univariate Analysis of Variance

    Hi, I am working on my latest paper and am having some problems with how to present results from Univariate Analysis of Variance made in spss. ...

    Started by hallar‎, 09-28-2011 12:44 PM
    • Replies: 0
    • Views: 2,885
    09-28-2011, 12:44 PM Go to last post
  27. Please assist me in Anova

    I don't have a lot of knowledge on Stats. I recently ran an experiment looking at whether a drug is toxic or not by treating the animal and monitors...

    Started by Halls‎, 07-26-2009 09:23 AM
    • Replies: 4
    • Views: 2,849
    07-28-2009, 02:01 AM Go to last post
  28. Potato Chip Problem

    There is a problem in all the statistics slides on line and I can not figure out how they arrived at their answer. A potato-chip producer wonders...

    Started by halondo‎, 10-20-2015 10:23 PM
    • Replies: 2
    • Views: 1,227
    10-21-2015, 05:33 AM Go to last post
  29. question about best point estimate and maximum error of the estimate

    Hi, I am currently studying for my final exam in elementary statistics, and I just cannot figure out how to work this problem out, and there are...

    Started by halp007‎, 04-26-2011 03:21 PM
    • Replies: 0
    • Views: 2,029
    04-26-2011, 03:21 PM Go to last post
  30. comparison of several samples to one sample

    hi guys, need some help with this problem. We are essentially comparing a consumption of coffe at home and abroad, what we have is the average...

    Started by ham243‎, 04-28-2011 12:36 PM
    • Replies: 1
    • Views: 1,769
    04-28-2011, 02:05 PM Go to last post
  31. Trying to display 3+ scaled variables in one table

    Hello, I've been trying to display 3 variables that use the same scale with the same value labels in one table in SPSS V19 and have been...

    Started by hameed‎, 10-02-2012 06:14 PM
    frequency, scales, tables, variables
    • Replies: 1
    • Views: 1,225
    10-03-2012, 08:40 PM Go to last post
  32. Significance Test for Comparing two Proportions

    I need some help comparing two proportions. I am currently doing research on the inhibiton of a particular phenotype by various chemicals. The...

    Started by Hamiltop‎, 12-13-2010 12:39 PM
    • Replies: 11
    • Views: 6,996
    12-18-2010, 10:54 PM Go to last post
  33. urgent help required in stats

    I need only explanation to these basic level questions for my son 1. The archaeological site of Tara is more than 4,000 years old. Tradition...

    Started by hammad_arshad‎, 07-15-2007 09:31 PM
    • Replies: 0
    • Views: 8,943
    07-15-2007, 09:31 PM Go to last post
  34. Question How to Compare the Difference of a Change in Proportions

    I have patient data collected from intervention hospitals and control hospitals at two points in time. I am interested in looking at survival (and...

    Started by hammergram‎, 08-20-2015 10:44 PM
    • Replies: 1
    • Views: 930
    08-21-2015, 02:36 AM Go to last post
  35. Effect Size Conversion Puzzle

    Doing a meta-analysis with studies using diverse approaches to design and analysis. Trying to convert all effects to effect size d. For data that...

    Started by hammrton‎, 01-15-2014 09:46 AM
    • Replies: 0
    • Views: 1,277
    01-15-2014, 09:46 AM Go to last post
  36. Understanding A Basic Probability

    Hi everyone, I'm new here, so I apologize if this post is in the wrong forum or of incorrect format. So my question is; Assuming Person A has...

    Started by Hammy‎, 05-06-2016 01:56 PM
    • Replies: 2
    • Views: 1,073
    05-06-2016, 02:30 PM Go to last post
  37. How to do this question!

    Many colleges and universities hold a “blood drive” for organizations such as the Red Cross. To help with the planning of an upcoming blood drive,...

    Started by hamza101‎, 11-28-2012 05:31 AM
    • Replies: 1
    • Views: 1,163
    11-28-2012, 10:24 AM Go to last post
  38. Can someone help with this question ?

    The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these...

    Started by hamza101‎, 11-28-2012 11:10 AM
    • Replies: 1
    • Views: 1,286
    11-28-2012, 11:13 AM Go to last post
  39. Non-parametric tests for repeated measures data

    Hi, I'm having difficulty finding an appropriate test for my data. The experiment is looking at the distance animals have moved from a...

    Started by han8‎, 10-30-2015 08:36 PM
    anova, non-normal distribution, non-parametric, repeated measures
    • Replies: 4
    • Views: 1,789
    11-02-2015, 02:56 AM Go to last post
  40. Help deciding what test to use?

    Hi all, I'm a bit confused on deciding what test to used to analyze some survey results. I have two conditions, those that do X1 and those that do...

    Started by Handler11‎, 04-11-2012 01:21 PM
    • Replies: 2
    • Views: 2,259
    04-11-2012, 02:42 PM Go to last post
  41. How to find the expectation of x^1/2 ?

    Hi all, I am trying to find the expectation of x^1/2 where x~N(a,b) ( Normal with mean a and variance b). Any feedback would be highly...

    Started by haneef‎, 04-10-2010 08:44 PM
    • Replies: 2
    • Views: 3,292
    04-14-2010, 02:10 AM Go to last post
  42. simple normal distribution question

    Hello, studying for a test and need to make sure.. If X1 - X2 ~ N(0, 2 sigma^2), how do I convert them to N(0,1)? What is the general formula for...

    Started by hanelliot‎, 04-24-2009 09:49 PM
    • Replies: 10
    • Views: 3,357
    04-25-2009, 11:07 AM Go to last post
  43. finding p-value

    I'm doing a question and I'd appreciate some help.. Q) random sample of 26 victoria college students taken, and their SAT scored recorded. sample...

    Started by hanelliot‎, 04-24-2009 11:25 PM
    • Replies: 5
    • Views: 4,308
    04-25-2009, 04:23 PM Go to last post
  44. Why is Z0.05 = 1.645?

    I'm using a standard normal table from back of my text, and I can't find 1.645 anywhere. If anything, shouldn't it be 0.4801? What am I missing?...

    Started by hanelliot‎, 04-25-2009 11:56 AM
    • Replies: 2
    • Views: 130,665
    04-25-2009, 02:09 PM Go to last post
  45. types of test statistics

    Can anyone help me WHY we are using certain tests/CI's for certain cases? I get some of them but not all. Thanks. Q) random sample of 26 students...

    Started by hanelliot‎, 04-25-2009 10:30 PM
    • Replies: 2
    • Views: 3,205
    04-26-2009, 11:54 AM Go to last post
  46. relationship between CI and sample sizes

    Say two items both have normal distribution with same variance. Sample sizes are 13 and 18 respectively.. say we find 98% CI for the difference...

    Started by hanelliot‎, 04-27-2009 03:17 AM
    • Replies: 2
    • Views: 1,912
    05-19-2009, 05:54 AM Go to last post
  47. using different test statistics (in general)

    How do I know when to use test statistic of Chi-square, T, F, Z? I know we can use T when distribution is normal and n < 30.. what about others?

    Started by hanelliot‎, 04-27-2009 09:00 AM
    • Replies: 1
    • Views: 1,747
    04-27-2009, 02:45 PM Go to last post
  48. Variance in simple linear regression model

    it's that time of the year again (exams) and I was looking for some help. Consider the simple linear regression model Yi = β0 + β1Xi + ϵi ϵi's...

    Started by hanelliot‎, 06-20-2009 03:26 PM
    • Replies: 5
    • Views: 7,005
    06-21-2009, 09:53 PM Go to last post
  49. finding p-value from F distribution table

    Sorry if I'm creating too many threads, this will be the last (before the test). I'm doing hypothesis test for multi-regression model, and I need...

    Started by hanelliot‎, 06-21-2009 02:02 PM
    • Replies: 3
    • Views: 87,274
    07-26-2012, 10:34 PM Go to last post
  50. 0.025 quantile from standard normal dist. is

    1.96. Can anyone tell me how we get this number? This is related to Wald test. I don't know how I can calculate 0.025 upper quantile from...

    Started by hanelliot‎, 02-22-2010 11:21 PM
    • Replies: 1
    • Views: 5,713
    02-23-2010, 02:21 AM Go to last post
  51. finding p-value when F-value and df's are known

    Websites like this: http://www.danielsoper.com/statcalc/calc07.aspx gives you exact p-value when u enter F-value, and df's. Is there any way we can...

    Started by hanelliot‎, 02-24-2010 12:46 AM
    • Replies: 3
    • Views: 9,374
    02-24-2010, 05:30 AM Go to last post
  52. perfect fit model and making inferences

    In linear regression, if model fits data perfectly, then it's impossible to carry out inference on the parameters. I understand this part. However,...

    Started by hanelliot‎, 03-09-2010 04:39 PM
    • Replies: 1
    • Views: 1,988
    03-11-2010, 02:22 PM Go to last post
  53. how would you replicate/randomize this study?

    We want to study the effect of 3 types of pots (aluminum, clay and iron pots) on the food's mean iron content. We have 15 different foods available...

    Started by hanelliot‎, 03-28-2010 08:12 PM
    • Replies: 4
    • Views: 2,542
    03-28-2010, 09:21 PM Go to last post
  54. how to deal with same AIC for compound symmetry and AR(1)?

    In 3 covariance structures (compound symmetry, AR(1), unstructured), we know that lower the AIC the better.. but what do you do if AIC for compound...

    Started by hanelliot‎, 03-29-2010 10:14 PM
    • Replies: 3
    • Views: 3,030
    03-30-2010, 11:47 AM Go to last post
  55. Post lost about locating info.

    :confused: I would appreciate any help on locating specific examples where businesses can effectively use statiscal tools. I have found great...

    Started by hanging in there‎, 11-12-2005 12:44 AM
    • Replies: 2
    • Views: 3,030
    11-13-2005, 03:45 PM Go to last post
  56. glm repeated measures

    Hello all, I am running a repeated measures analyses, with a continuous set of variables, but I want to compare between 4 groups (ordinal...

    Started by Hani Tamim‎, 05-21-2016 05:55 PM
    • Replies: 0
    • Views: 924
    05-21-2016, 05:55 PM Go to last post
  57. Post what is the difference between formative models vs reflective models ?

    Hello Can someone explain to me with easy example to make me understand the difference between formative and reflective models ?

    Started by hanialbarni‎, 11-26-2014 11:57 AM
    • Replies: 1
    • Views: 3,601
    11-26-2014, 02:55 PM Go to last post
  58. How to calculate sample size manually ?

    Hello If My Confidence Level = 95% Margin of error = 5% Number of observation = 211 How can i calculate the sample size ? Can someone...

    Started by hanialbarni‎, 12-14-2014 03:02 AM
    • Replies: 2
    • Views: 2,544
    12-14-2014, 11:40 AM Go to last post
  59. need help to estimate weights in order to proxy a variable in eviews 5

    Hi, I need to proxy for a variable I don´t know, (formula in the attached picture), using weights I don´t know. Basically, the only thing I do...

    Started by hanke83‎, 05-25-2011 08:27 AM
    • Replies: 0
    • Views: 1,992
    05-25-2011, 08:27 AM Go to last post
  60. -->(BOX-COX) Transformation breaks down for large (positive) coefficient values <--

    Hi, I have done a box-cox transformation of my response variable, using the following formula: (Y^lambda - 1)/lambda Previously, I have got some...

    Started by hanke83‎, 06-07-2013 04:05 AM
    box-cox, sas proc_transreg, transformation
    • Replies: 0
    • Views: 1,375
    06-07-2013, 04:05 AM Go to last post

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