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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: 197,197
    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: 66,974
    09-30-2005, 09:44 AM Go to last post
  1. Goodness of Fit test with 2 sets of data, not sure how many degrees of freedom I have

    I have two data sets, one with 1000 observations and the other with 50. The observations can equal A, B, C or D. Now using the first set of data I...

    Started by JJstar‎, 10-10-2013 10:59 AM
    degrees of feedom, goodness of fit
    • Replies: 1
    • Views: 1,444
    10-10-2013, 10:58 PM Go to last post
  2. Calculating a Normal Distribution With a Set Mean

    Hello, I came across a problem that I was hoping to get some help on. I have ~$3,260 to spend on 6 different items priced at: $5 each $5.50...

    Started by Rob636‎, 10-09-2013 08:04 PM
    • Replies: 1
    • Views: 1,620
    10-10-2013, 10:54 PM Go to last post
  3. Can I combine data from different sources?

    Hi all, I'm very novice at statistics but part of my course is to complete a small research project. My supervisor has said that she can't help me...

    Started by yokolatte‎, 10-10-2013 08:08 PM
    combine, data, different samples, different sources
    • Replies: 1
    • Views: 1,808
    10-10-2013, 10:46 PM Go to last post
  4. Bayes Factor for Complex Model

    Hi Folks, I have a series of nested large multiwave CFA models that I want to compare using Bayes Factors. Now I know that BF =...

    Started by Lazar‎, 10-10-2013 03:22 PM
    • Replies: 2
    • Views: 1,159
    10-10-2013, 09:40 PM Go to last post
  5. Struggling to select right stats test.

    Hi there folks, I'm fairly new to science, love the learning, daunted by the statistics. I've recently finished a summer-long experiment in the...

    Started by LunarTish‎, 10-10-2013 06:47 AM
    choices, confused, help me!, statistics, toxicology
    • Replies: 3
    • Views: 1,130
    10-10-2013, 07:37 PM Go to last post
  6. covariance

    Hi, I am a layman on statistics. I have a problem with conditional distribution. I got this bivariate normal distribution. The problem is I have to...

    Started by Zarabb‎, 10-10-2013 04:40 PM
    • Replies: 1
    • Views: 1,135
    10-10-2013, 06:26 PM Go to last post
  7. Question Lorenz curve ordinates - any help greatly appreciated

    Hi all, first time on the forum, would greatly appreciate any help regarding the attached question :confused:

    Started by qwerty786‎, 10-10-2013 07:18 AM
    • Replies: 2
    • Views: 1,720
    10-10-2013, 08:10 AM Go to last post
  8. Correct statistical tests?

    I have two questions. I need to know which stats test to run. I have figured out most of my problems, but two of them have me a little stumped. ...

    Started by newatstats‎, 10-08-2013 10:45 PM
    • Replies: 3
    • Views: 1,475
    10-10-2013, 06:32 AM Go to last post
  9. Brownian Motion

    Hello! I have a simple question to which I haven't found any answers on the internet :( Is a standard normal random variable a brownian motion?...

    Started by Fiou‎, 10-09-2013 03:55 PM
    • Replies: 4
    • Views: 1,590
    10-10-2013, 03:12 AM Go to last post
  10. Cohen's d and r, r squared clarification please

    Hi all, Firstly, GretaGarbo has been of great assistance in my issues with the most appropriate ANOVA for my study - so thanks there. My study...

    Started by GiantCorn‎, 10-09-2013 11:27 PM
    • Replies: 4
    • Views: 4,528
    10-10-2013, 01:45 AM Go to last post
  11. One way or two way ANOVA?

    Hi all, I'd like someone to just confirm that my thinking is on track here. I have some language students. I give them a placement test. ...

    Started by GiantCorn‎, 10-07-2013 03:30 AM
    • Replies: 6
    • Views: 1,370
    10-09-2013, 11:16 PM Go to last post
  12. 12 years old. Expected value help please?

    Hi I'm just getting started with this topic and am stuck. X follows a continuous uniform distribution on . Find E. K is a integer. I got θ as...

    Started by Davie322‎, 10-09-2013 06:20 PM
    • Replies: 1
    • Views: 1,389
    10-09-2013, 08:42 PM Go to last post
  13. Logistic Regression: Goodness of Fit Query

    I am using binary logistic regression. Event 1 - 750 Event 0 - 60500 I have 5 independent variables of which 2 are binary. All my predictors...

    Started by prakritinaswa‎, 10-07-2013 02:59 PM
    • Replies: 8
    • Views: 1,546
    10-09-2013, 03:03 PM Go to last post
  14. Question New to statistics - looking for guidance

    I am a mature student and starting to study statistics. From what I learned so far, at a high level, I understand the basic theory although I look...

    Started by MacAdama‎, 10-05-2013 05:41 AM
    • Replies: 3
    • Views: 996
    10-09-2013, 01:52 PM Go to last post
  15. Talking Mixed repeated measures/ Mixed anova factorial, Can I pick someone's brains!?

    Group 1 Pre test Training Post test Maintenance Group 2 Baseline No training Pre test Training Post test Maintenance This is the format...

    Started by lucyloomonkey‎, 10-09-2013 11:38 AM
    • Replies: 0
    • Views: 1,406
    10-09-2013, 11:38 AM Go to last post
  16. Choice of test in R. Repeated measurements, binary response and missing data...

    I have two treatments and one co-variate (affect the response variable but is also correlated with one of the treatments). Each replicate has been...

    Started by HannahKarolina‎, 10-02-2013 06:46 AM
    binary data, gee, glmm, r code, repeated measurements
    • Replies: 2
    • Views: 980
    10-09-2013, 03:20 AM Go to last post
  17. choosing the correct statistical test

    Hello , I need help with choosing the right statstical test, I have three groups of animals each group conatain 3 animals, if have trated each group...

    Started by hussein.57‎, 10-02-2013 08:48 AM
    • Replies: 1
    • Views: 1,161
    10-08-2013, 08:52 PM Go to last post
  18. Central Limit Theorem -- How to solve given % of distribution

    Here is one of several problems that I can't figure out... The public school system in a certain county has a special, free remedial reading...

    Started by sm2010‎, 10-02-2013 05:38 PM
    • Replies: 1
    • Views: 2,398
    10-08-2013, 08:50 PM Go to last post
  19. R, pwr: Which test to determine the sample size in a multi-stage random sample?

    I have deleted this post here to re-post. I saw that this was "basic" but didn't realize it was fairly limited to homework questions. My apologies.

    Started by Binip‎, 10-08-2013 04:33 PM
    • Replies: 0
    • Views: 1,712
    10-08-2013, 04:33 PM Go to last post
  20. Regression model for difference-in-difference analysis of count of visits

    Hello All, I'm conducting a study where my outcome of count of hospitalizations. The count of hospitalizations will be measure pre-and post-index...

    Started by MPHEPI‎, 10-08-2013 04:15 PM
    • Replies: 2
    • Views: 3,335
    10-08-2013, 04:32 PM Go to last post
  21. Best test for normal distribution with as little samples / highest accuracy

    Hi there, I only completed one statistics class yet and now struggle with my first project involving statistics. :-) I want to conduct an...

    Started by chris123‎, 10-08-2013 07:00 AM
    normal, performance, sample size, test
    • Replies: 3
    • Views: 1,659
    10-08-2013, 10:22 AM Go to last post
  22. Test for error of central tendency

    Dear community, I have two groups of users who rate on 7-point-scores for n data items. Now I want to test whether there is a difference in both...

    Started by chris123‎, 10-08-2013 07:02 AM
    error of central tendency, normal, test
    • Replies: 3
    • Views: 2,173
    10-08-2013, 10:21 AM Go to last post
  23. Totally confused! re-scaling using rank ties command?

    Hi, Thank you all for all those kind helps all the time. I'm always getting useful advices here. This time, I have a question on making a...

    Started by bomool‎, 10-08-2013 08:09 AM
    ordinal variable, rank, rescaling, standardize
    • Replies: 0
    • Views: 984
    10-08-2013, 08:09 AM Go to last post
  24. Linear Regression

    Delete this thread

    Started by brojesus111‎, 10-07-2013 10:55 PM
    • Replies: 0
    • Views: 916
    10-07-2013, 10:55 PM Go to last post
  25. Possible to create frequency distribution table from a data set using Ti-84?

    Hey everyone I wanted to ask if it's possible to create a frequency distribution(and cumulative) table from a given set of value using a Ti-84 it...

    Started by qvr‎, 10-07-2013 08:42 PM
    • Replies: 0
    • Views: 2,198
    10-07-2013, 08:42 PM Go to last post
  26. Tobit model

    Hello, how does the Tobit model treat censored dependent variable data? I have a dataset with zeros that actually stand for non-zero but missing...

    Started by germaniawerks‎, 10-07-2013 09:21 AM
    censored, data, model, tobit
    • Replies: 3
    • Views: 872
    10-07-2013, 01:39 PM Go to last post
  27. Mean/Median Question

    Thanks for taking the time to look at this question. I don't know how you find the mean/median of this data set and was hoping someone could assist...

    Started by bamako‎, 10-05-2013 02:27 AM
    • Replies: 2
    • Views: 2,268
    10-07-2013, 11:12 AM Go to last post
  28. Cool Normality testing in independent samples t-test

    Hello, I have searched these forums and can't seem to find an answer. If anyone can help me out I would be very appreciative as I just can't figure...

    Started by TomMor‎, 10-07-2013 06:26 AM
    • Replies: 2
    • Views: 1,276
    10-07-2013, 08:36 AM Go to last post
  29. Logistic Regression: interpreting an interaction term

    Dear Forum, This topic has been covered a lot here and in other forums, but I have yet to find a clear answer to this particular problem. I'm...

    Started by rclukey‎, 10-07-2013 01:08 AM
    interaction, logistic regression, odds ratios
    • Replies: 0
    • Views: 1,504
    10-07-2013, 01:08 AM Go to last post
  30. Using ttest instead of R-Squared for acceptance

    I have independent variable X and dependent variable Y. I am trying to compare the predictive power of a number of regression based models. For each...

    Started by Vatsa‎, 10-06-2013 06:37 PM
    rsquare, ttest
    • Replies: 1
    • Views: 1,220
    10-06-2013, 10:17 PM Go to last post
  31. Relationship satisfaction

    Some friends of mine asked me to help them with an assignment, since I study Math. Unfortunately, Statistics is not really my cup of tea and it's...

    Started by andrea.gagna‎, 10-06-2013 08:17 PM
    • Replies: 1
    • Views: 825
    10-06-2013, 09:30 PM Go to last post
  32. Analysis of two variables in one group

    Hello everyone, I have following question: I have two compare the concentration of two different drugs in a group of 19 patients. Every patient...

    Started by Boian‎, 10-06-2013 11:53 AM
    • Replies: 1
    • Views: 965
    10-06-2013, 01:19 PM Go to last post
  33. plz help for spss

    how can i make this table from spss. i guess i've to compare ordinal vs scale data. how can i do that and how can i find p value. kindly help. i'm...

    Started by electronpg‎, 10-06-2013 01:36 AM
    • Replies: 3
    • Views: 1,471
    10-06-2013, 05:07 AM Go to last post
  34. plz help for spss

    how can i make this table from spss. i guess i've to compare ordinal vs scale data. how can i do that and how can i find p value. kindly help. i'm...

    Started by electronpg‎, 10-06-2013 01:29 AM
    • Replies: 0
    • Views: 1,512
    10-06-2013, 01:29 AM Go to last post
  35. Chi-square test followed by testing with subgroups

    Just checking that I'm thinking about this right... I have the number of units sold for 3 years by season: Spring 3000 Summer 3500 Autumn...

    Started by sevenof9‎, 10-04-2013 01:31 PM
    chi-square test, experimental units, subgrouping
    • Replies: 3
    • Views: 4,486
    10-05-2013, 11:58 PM Go to last post
  36. I Need Help..

    Dear, members of Talk Stats.. I need to know how to solve these 5 questions by STATISTICA PROGRAM. I want the STEPs for each question. Questions...

    Started by Abu_Nayef_10‎, 10-05-2013 12:33 PM
    • Replies: 1
    • Views: 1,693
    10-05-2013, 11:08 PM Go to last post
  37. VAR or VECM with I(1) and I(0) series

    Hello, I am trying to estimate macroeconomic data with VAR. I have a system of 5 equations. 3 of the series are I(1) while 2 are I(0). I have a few...

    Started by sx26‎, 10-05-2013 09:04 PM
    estimation, integration, var, vecm
    • Replies: 0
    • Views: 4,337
    10-05-2013, 09:04 PM Go to last post
  38. Multiple Linear Regression Proof

    Hi everyone, I am enrolled in a regression analysis course at university and the prof really loves to ask for proofs on his assignments....

    Started by coastalsense‎, 10-05-2013 04:53 PM
    matrices, multiple regression, proof, regression, sums of squares
    • Replies: 0
    • Views: 2,203
    10-05-2013, 04:53 PM Go to last post
  39. Statistic Quiz - What did i do wrong?

    I got 2 wrong? which ones? :/ A statistician employed by a television rating service wanted to determine if there were differences in television...

    Started by mikey32230‎, 10-05-2013 04:17 PM
    • Replies: 0
    • Views: 3,172
    10-05-2013, 04:17 PM Go to last post
  40. Diagnostics on panel data regression

    Hey guys. First; sorry about the double thread. I posted this question wrong at first. I've not worked much in panel data regression but what...

    Started by starpen‎, 10-05-2013 03:46 PM
    • Replies: 0
    • Views: 1,874
    10-05-2013, 03:46 PM Go to last post
  41. Statistics - Hypothesis Test Case / Power Test Question - Is my thinking correct?

    Okay i have answered 2 different questions, and would greatly appreciate it if someone could tell me if my thinking was right behind answering these...

    Started by mikey32230‎, 10-05-2013 03:28 PM
    • Replies: 0
    • Views: 1,497
    10-05-2013, 03:28 PM Go to last post
  42. Understanding a proof(Discrete Confidence Intervals)

    Hi all, I need some help understanding the following proof. The argument is a bit dense so please bear with me. Theorem Let X_1.X_2,...,X_n be...

    Started by JohnK‎, 10-05-2013 09:51 AM
    • Replies: 4
    • Views: 1,125
    10-05-2013, 02:37 PM Go to last post
  43. Cool Probability question-- need help

    A and B are college football teams that have gone into overtime. In the first round A will go first with the following possible outcomes: no...

    Started by MathNoob123‎, 10-05-2013 02:13 PM
    • Replies: 0
    • Views: 886
    10-05-2013, 02:13 PM Go to last post
  44. Count Data with standard deviance proportional to mean

    I am writing in the hope to get an answer to my question. I have count data and I wanna to use generalized linear model. The standard deviance is...

    Started by belkis‎, 10-05-2013 08:03 AM
    • Replies: 2
    • Views: 1,772
    10-05-2013, 10:03 AM Go to last post
  45. [Ask] Central Limit Theorem

    Hi everyone I am applying Central Limit Theorem on my data set the multivariate normal distribution and the observations are about 392 data and...

    Started by harris‎, 10-04-2013 11:22 PM
    • Replies: 1
    • Views: 663
    10-04-2013, 11:48 PM Go to last post
  46. Cohen's d formula

    Hi guys, Quick question regarding the formula for cohen's d. I've seen two different formulas for this for an independent samples t-test. One...

    Started by rbod‎, 10-04-2013 02:12 PM
    • Replies: 2
    • Views: 5,290
    10-04-2013, 02:50 PM Go to last post
  47. Very General - Simple Statistics Question

    This is a general question i have. **** FULL QUESTION **** Problem: Lexico specializes in the manufacture of coated cables. (Do a Google search...

    Started by mikey32230‎, 09-28-2013 02:04 PM
    • Replies: 14
    • Views: 4,059
    10-04-2013, 01:55 PM Go to last post
  48. Nested sampling: posterior samples randomly scattered in the area under L(x)? Why?

    Hi All, I am new to this forum, so I hope you will bear with me (and forgive mistakes etc:) I am reading on nested samples (got into it reading...

    Started by alexander.scpv‎, 10-04-2013 10:20 AM
    nested sampling, sivia, skilling
    • Replies: 0
    • Views: 1,281
    10-04-2013, 10:20 AM Go to last post
  49. Let me know what I did wrong on these probability problems (confused)

    1. Suppose that 71% of University student graduate in four years, and 81% graduate in six years. If you randomly select 10 first year University...

    Started by JohnWayne‎, 10-04-2013 06:36 AM
    • Replies: 2
    • Views: 1,109
    10-04-2013, 09:59 AM Go to last post
  50. Simulating a change in the mean score for a dicrete (10 point scale) distribution

    Hi, For my work at a research company, we often get asked by our clients what would happen to an outcome measure (e.g. like customer...

    Started by JamieBurnett‎, 10-03-2013 12:50 PM
    • Replies: 2
    • Views: 1,269
    10-04-2013, 02:12 AM Go to last post
  51. Need help with EPA-method

    I stumbled on EPA method of seasonal decomposition time-series. EPA - Economic Planning Agency of Japan. Unfortunately, all articles describing this...

    Started by statphys‎, 10-03-2013 11:10 PM
    • Replies: 0
    • Views: 1,223
    10-03-2013, 11:10 PM Go to last post
  52. Poisson Model Help

    Hi everyone, I am having a hard time finding my lambda for this homework question. I know something has to be multiplied to get it into the same...

    Started by JacquelineN‎, 10-03-2013 09:59 PM
    bernoulli, help please, help statistics question, poisson, poisson distribution
    • Replies: 0
    • Views: 2,428
    10-03-2013, 09:59 PM Go to last post
  53. HELP on Statistics

    Hi All, statistics is really not for me, so please help I have 2 population of dogs one from the shelter n100 and one from a boarding kennel n100...

    Started by loopop‎, 10-01-2013 06:01 PM
    • Replies: 7
    • Views: 1,320
    10-03-2013, 03:02 PM Go to last post
  54. standard error and uncertainty on a single measurement

    This may be a stupid question, but I am not a mathematician! During an experiment, a measurement is taken several times (in the same conditions)...

    Started by laurence laneque‎, 09-25-2013 12:10 PM
    • Replies: 3
    • Views: 1,954
    10-02-2013, 05:02 PM Go to last post
  55. Creating alerts with stdevs & mean. How to deal with small sample size and trends

    Hi! I'm trying to build a daily alert system to let me know when something unusual has happened in my analytics data that might require further...

    Started by needlesslosses‎, 10-02-2013 03:22 PM
    • Replies: 0
    • Views: 994
    10-02-2013, 03:22 PM Go to last post
  56. How to find the Cov(estimated beta0,estimated beta1)?

    Hi, i wonder how to find the Cov(estimated beta0,estimated beta1)? Thanks!

    Started by drivesafe‎, 09-29-2013 09:38 PM
    linear regression, statisics
    • Replies: 3
    • Views: 2,521
    10-02-2013, 09:44 AM Go to last post
  57. Hypothesis Testing

    Can someone please explain this? How did that conclusion arrive? P(Type I error) = P(reject H0 | H0 is true) = P(X1 ≤ c, X2 ≤ c | N = 16) = cC2...

    Started by v-moda‎, 10-02-2013 07:35 AM
    alternative hypothesis, hypotheis test, null hypothesis
    • Replies: 3
    • Views: 1,178
    10-02-2013, 09:30 AM Go to last post
  58. adjusting p value for familywise error rate

    I have conducted a MANOVA for a data set and have found interactions. I explored the interaction with ANOVA and then t tests. What are the...

    Started by jamie157‎, 09-22-2013 07:50 AM
    • Replies: 4
    • Views: 2,040
    10-02-2013, 08:14 AM Go to last post
  59. Normal distribution

    Can anyone help me, Zt~ N(0,1) and Xt = sqrt(t) * Zt How do you show that Xt follows a normal distribution N(0,t)? Thank you!

    Started by Fiou‎, 10-01-2013 02:41 PM
    • Replies: 6
    • Views: 1,628
    10-02-2013, 06:18 AM Go to last post
  60. Guidance to solve House Prices Data Set Statistical Analysis Problem

    Dear All.. Thankyou for reading my thread and experts please pardon me if this question seems too silly or an outlier or too lengthy to answer...

    Started by mysta‎, 10-02-2013 12:42 AM
    • Replies: 0
    • Views: 3,307
    10-02-2013, 12:42 AM Go to last post

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