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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: 196,557
    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: 66,616
    09-30-2005, 09:44 AM Go to last post
  1. Outlier

    Hi, Is there any way to find outlier without having the distribution of data? Thanks and Regards

    Started by Target‎, 03-20-2013 03:56 AM
    • Replies: 4
    • Views: 1,713
    03-20-2013, 04:55 AM Go to last post
  2. Distributions and means - confidence interval question

    Hi folks, :wave: I think I did my research but I would like to be sure before continuing. My task is to find the mean price of a given item in...

    Started by julian.driest‎, 02-22-2013 11:05 AM
    confidence interval, distribution, normal, t-distribution
    • Replies: 1
    • Views: 940
    03-20-2013, 03:17 AM Go to last post
  3. Normal distribution function

    Hi, Is the following integral equels to F(z)(distribution function for standard normal distribution at point z) but we dnt know which distribution...

    Started by Target‎, 03-20-2013 02:42 AM
    • Replies: 1
    • Views: 924
    03-20-2013, 02:58 AM Go to last post
  4. Statistic query

    If im looking at current method vs new method for 8 specimens - 1)Semis vs Semis 2) Ultras vs Ultras and instead i look at statistics to score...

    Started by TomJ‎, 03-20-2013 02:26 AM
    • Replies: 0
    • Views: 769
    03-20-2013, 02:26 AM Go to last post
  5. Determining causality of model

    Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3X_{t-2} + w_{t} + w_{t-1} + w_{t-2} where w_{t} is WN(0,\sigma^{2}). How would you express...

    Started by lord12‎, 03-19-2013 07:49 PM
    • Replies: 0
    • Views: 843
    03-19-2013, 07:49 PM Go to last post
  6. Writing model in terms of backshift operator

    Suppose you have the model: X_{t} = 0.2*X_{t-1} + 0.3_X_{t-2} + w_{t} + w_{t-1} + w_{t-2}

    Started by lord12‎, 03-19-2013 07:40 PM
    • Replies: 0
    • Views: 871
    03-19-2013, 07:40 PM Go to last post
  7. Need help

    I want to analyze the correlation and the significanse between blood test cound (continous variable) and another continous variable- which test shoul...

    Started by Mudale mudale‎, 03-19-2013 09:27 AM
    • Replies: 4
    • Views: 1,671
    03-19-2013, 02:27 PM Go to last post
  8. How do I analyze the results of a simple standard error test (with 95% confidence)?

    Hi I'd be really appreciative if anyone might be able to help me. I'm studying biology at a foundation level and have recently been introduced to...

    Started by ggdf‎, 03-19-2013 12:38 PM
    • Replies: 0
    • Views: 679
    03-19-2013, 12:38 PM Go to last post
  9. Using MDP toolbox in R

    I have a data set with 2 state spaces (for which I've already generated a transition matrix). The form of the transition matrix is the following...

    Started by catch22lena‎, 03-19-2013 12:21 PM
    markov decision process, r toolbox, transition matrix
    • Replies: 0
    • Views: 2,259
    03-19-2013, 12:21 PM Go to last post
  10. Help with a basic question about the role of weights in SPSS

    I'm helping someone out with kind of a cruddy dataset, I was hoping I could ask a question about how weights work in SPSS and if I'm thinking...

    Started by jroden‎, 03-14-2013 04:40 PM
    • Replies: 3
    • Views: 1,514
    03-19-2013, 11:51 AM Go to last post
  11. Chi-square or McNemar test when data is not totally independent ?

    Hello , I have data that could be match between 40% up to 90% , should I use chi-square or McNemar test ? Thanks

    Started by tnaser‎, 03-19-2013 11:16 AM
    • Replies: 0
    • Views: 775
    03-19-2013, 11:16 AM Go to last post
  12. Regression Model

    Question : Exam 1 Scores, 92, 87, 91, 86, 97, 97, 94, 71, 61, 77, Exam 2 scores, 70,83,93,87,97,97,93,87,73,87.. N=10 Create a Simple...

    Started by ljoyner‎, 03-19-2013 08:14 AM
    • Replies: 1
    • Views: 881
    03-19-2013, 10:38 AM Go to last post
  13. about "two factorial nonparametric analysis ",help

    what is two factorial nonparametric analysis? is there any difference between it and cmh chi-square? can i use sas software to do it?

    Started by baixyz‎, 03-19-2013 02:50 AM
    • Replies: 0
    • Views: 898
    03-19-2013, 02:50 AM Go to last post
  14. Having hard time coming up with an null hypothesis for one way Anova

    My independent variable is assessment of whether respondents fear that crime is the worst problem in their city, and this assessment has 3 catagories...

    Started by ddd321‎, 03-18-2013 05:24 PM
    • Replies: 2
    • Views: 1,587
    03-18-2013, 09:20 PM Go to last post
  15. Comparing the accuracy of two diagnostic tests applied on the same sample

    Hi there, I have recently come across some data that compares the accuracy of two diagnostic tests. We have 214 samples which are tested positive...

    Started by NancyW‎, 03-18-2013 06:58 AM
    mcnemar's test
    • Replies: 3
    • Views: 3,943
    03-18-2013, 08:57 PM Go to last post
  16. Expected value of the sum of the absolute value of iid random variables

    How do you go about finding the expected value of the sum(abs(X_i)), i=1,...,n? The X_i are iid Normal with mean 0 and variance theta.

    Started by slk1617‎, 03-18-2013 01:54 PM
    • Replies: 1
    • Views: 3,807
    03-18-2013, 01:58 PM Go to last post
  17. chisq.test with correction

    Hi, I Know with the data a c t 1 1 1 1 2 1 1 0 3 2 3 2 4 1 1 0

    Started by slavia‎, 03-18-2013 01:19 PM
    • Replies: 1
    • Views: 905
    03-18-2013, 01:31 PM Go to last post
  18. Help Deciding How to Set up Datasheet

    Hey everyone, A bit stuck, attempting to do a statistical analysis for this research paper for my undergrad. I am basically looking at 3...

    Started by jamal01‎, 03-15-2013 04:28 AM
    • Replies: 1
    • Views: 960
    03-18-2013, 12:37 PM Go to last post
  19. unbiased of minimum variance estimators

    Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

    Started by sanmath‎, 03-18-2013 12:52 AM
    • Replies: 0
    • Views: 977
    03-18-2013, 12:52 AM Go to last post
  20. Mixed Models Linear Regression in SPSS

    Hello all, I am running a Mixed Models Linear Regression analysis in SPSS and I'm having trouble determining if I need to include both /RANDOM and...

    Started by Paul CPH‎, 03-18-2013 12:42 AM
    • Replies: 0
    • Views: 1,354
    03-18-2013, 12:42 AM Go to last post
  21. Creating a score out of a "select all that apply" question

    Dear Omniscienti, I asked the following question as my dependent variable: Which, if any, of the following actions has your household taken to...

    Started by cjyoung‎, 03-16-2013 10:58 PM
    • Replies: 4
    • Views: 1,380
    03-17-2013, 09:20 PM Go to last post
  22. How to rank long lists in Spearman's Rank Correlation?

    Hi there, I have 2 lists of 1000 items and ranked them based on criteria A or B. When I want to compare the Spearman correlation at N=20 ,...

    Started by tnaser‎, 03-15-2013 12:05 PM
    • Replies: 6
    • Views: 1,470
    03-17-2013, 09:20 PM Go to last post
  23. How to prove that a ranked list have more items from category A than B?

    Hi I have a ranked list of 50 items, that consists of items that either belong to category A or B. Is there a way/test to prove with some...

    Started by tnaser‎, 03-15-2013 08:05 AM
    • Replies: 5
    • Views: 1,457
    03-17-2013, 09:17 PM Go to last post
  24. Biodiversity indices comparison between 3 sites-Which test is appropriate?

    Hi, i would appreciate some help on the following: I have to compare 3 different farming management systems (Organic, conventional, integrated) in...

    Started by VassilisG‎, 03-17-2013 05:09 AM
    biodiversity, comparison, index
    • Replies: 1
    • Views: 1,357
    03-17-2013, 05:13 PM Go to last post
  25. Addressing intraclass correlation coefficient issues

    ICC estimates changes according to the magnitude of the data. If the data are >1, ICC values are going to be way closer to 1 than if the data are...

    Started by agp‎, 03-17-2013 04:28 PM
    • Replies: 0
    • Views: 1,542
    03-17-2013, 04:28 PM Go to last post
  26. Logistic regression versus chi square test for RCT data

    Hi My understanding of statistics is basic and mostly on an applied level, but now I have come into a discussion with my project leader and I'm...

    Started by pirflax‎, 03-14-2013 03:46 PM
    • Replies: 10
    • Views: 9,939
    03-17-2013, 03:46 AM Go to last post
  27. Question Test of proportional changes

    Hi all, I'm a transfer student trying to catch up on stats in my new program (the kids at my new university are a semester ahead of me) and I've...

    Started by stats_newb‎, 03-16-2013 08:21 PM
    • Replies: 0
    • Views: 1,579
    03-16-2013, 08:21 PM Go to last post
  28. Linearity of fixation points

    How can I test the linearity of fixation points for n participants. I have fixation points x, y for n participants. I have attached the file.

    Started by bongielondy‎, 03-15-2013 05:40 AM
    • Replies: 1
    • Views: 1,390
    03-16-2013, 08:04 PM Go to last post
  29. SOFA a recommended tool in statistics

    I was looking for a free tool and found SOFA Statistics which is an open-source statistical package, so I though to share it...

    Started by tnaser‎, 03-16-2013 03:41 PM
    • Replies: 0
    • Views: 1,115
    03-16-2013, 03:41 PM Go to last post
  30. Help with statistical tests

    Hi, I am new to statistics and am doing a project to test the degree of correlation between tree canopy cover and socio economic factors in given...

    Started by pjd1001‎, 03-16-2013 11:15 AM
    • Replies: 0
    • Views: 1,149
    03-16-2013, 11:15 AM Go to last post
  31. Some advice please re an appropriate statistical test

    Hello all, I am new to the forum and wondered if i could ask for some advice regarding a suitable statistical test I could use to analyse some...

    Started by rayman88‎, 03-16-2013 07:46 AM
    • Replies: 1
    • Views: 1,318
    03-16-2013, 09:04 AM Go to last post
  32. Smile Statistics help

    I am new to statistics and really need some help. Here is the title of my assignment: We are interested in whether there is a difference in the...

    Started by schoolwize56‎, 03-16-2013 08:06 AM
    • Replies: 0
    • Views: 872
    03-16-2013, 08:06 AM Go to last post
  33. Inter Observer Reliability

    Hi, I am trying to do an inter-observer reliability test in SPSS but with only one observer... if that makes sense, to ensure the consistency of...

    Started by ben90‎, 03-16-2013 05:54 AM
    • Replies: 0
    • Views: 2,088
    03-16-2013, 05:54 AM Go to last post
  34. Some Help, Please

    Let me give you the gists of the problem. n=15 p=.65 x value=10 Okay, it's asking me that at least 10 flights are on time. Our Prof,...

    Started by PSG‎, 03-14-2013 10:13 PM
    • Replies: 7
    • Views: 1,158
    03-15-2013, 11:31 PM Go to last post
  35. Quick question about choosing stats tests

    Hi guys, I'm sure someone out there will know the answer! I'm writing a paper looking at using two different types of staple to close surgical...

    Started by mcmullan.w‎, 03-15-2013 03:25 PM
    • Replies: 2
    • Views: 1,088
    03-15-2013, 05:16 PM Go to last post
  36. Calculate standard error of paired difference, based on standard error of each mean?

    Hello, I am trying to do a simulation-based power analysis to see whether my experiment had enough power to detect an effect of a similar size as...

    Started by ganajr‎, 03-15-2013 04:06 PM
    • Replies: 0
    • Views: 2,247
    03-15-2013, 04:06 PM Go to last post
  37. spearman rank correlation significance table using a tool

    Hi I am using R to get the spearman rank correlation. However, the significance table of it need to be checked alone. I found several DIFFERENT...

    Started by tnaser‎, 03-15-2013 09:35 AM
    • Replies: 4
    • Views: 3,426
    03-15-2013, 03:01 PM Go to last post
  38. How to compare a small sample to a large control group sample?

    Hello, The prupose of my research was to measure the impact of a dropout prevention program. I used a survey consisting mostly of Likert scales...

    Started by Passeport‎, 03-15-2013 08:18 AM
    likert, mann-whitney, non-parametric, sample size, t-test
    • Replies: 1
    • Views: 2,640
    03-15-2013, 08:24 AM Go to last post
  39. Sas 9.2 proc genmod problem

    Hello, I am currently stuck a bit with my model building using proc genmod. I need to save the model in order to be able to use it on the...

    Started by Titas_Vdovycia‎, 03-14-2013 09:48 AM
    • Replies: 3
    • Views: 1,664
    03-15-2013, 04:03 AM Go to last post
  40. Definition of replications vs treatments (factorial design question)

    I see on wikipedia replication is "the repetition of the set of all the treatment combinations to be compared in an experiment. Each of the...

    Started by domesplitter69‎, 03-14-2013 09:01 PM
    doe, factorial design, replicate, replication, treatment
    • Replies: 2
    • Views: 1,173
    03-15-2013, 02:08 AM Go to last post
  41. Little help - patients in a hospital

    So it has been many years since I did stats and need a little help. I am looking at the benefit of a specific laboratory test in a hospital...

    Started by xavier2000‎, 03-14-2013 10:28 PM
    • Replies: 0
    • Views: 836
    03-14-2013, 10:28 PM Go to last post
  42. Is a paired t-test appropriate in this situation?

    Hello, I distributed a survey comparing to different types of maps: conventional (paper) maps and a virtual map. The maps were compared using...

    Started by arroba761‎, 03-14-2013 09:13 PM
    • Replies: 2
    • Views: 1,496
    03-14-2013, 09:32 PM Go to last post
  43. Trouble with Calculating maximum Likelihood Estimate and Bayes Estimate

    Hi, I solved this problem and just not sure if I can go even further. Suppose that X is a geometric random variable with density function ...

    Started by Slime‎, 03-14-2013 01:52 PM
    • Replies: 8
    • Views: 2,635
    03-14-2013, 04:37 PM Go to last post
  44. Panel data graphs in STATA using by command

    Hi i am trying to make graphs using stata of panel data, with alot of stocks. The by variable i have to use is stock name, so that i get a two way...

    Started by NEWTOSTATA‎, 03-14-2013 04:15 PM
    graphs, line graph stata, multiple, stata
    • Replies: 0
    • Views: 4,380
    03-14-2013, 04:15 PM Go to last post
  45. ANOVA multiple comparisons corrections

    How would you perform multiple corrections when using the same data for two separate ANOVAs? Example: Groups AAA, BAA, ABA, BBA, AAB, ABB, BAB,...

    Started by jmlove‎, 03-13-2013 06:04 PM
    • Replies: 3
    • Views: 1,715
    03-14-2013, 03:33 PM Go to last post
  46. Calculating Significan Level and Power of a Test: Why's this answer correct?

    Hello, I am having difficulties understanding the difference in calculating the level of significance and power for a test. For example, a...

    Started by S-C-3-1-3‎, 03-13-2013 10:07 PM
    • Replies: 2
    • Views: 1,292
    03-14-2013, 10:11 AM Go to last post
  47. Smile Stats Test

    I have already completed my online stats test, and the teacher is not grading them until after spring break... and I really want to know my score...

    Started by davidbrookstone‎, 03-13-2013 07:02 PM
    crosstabs, crosstabulation, spss, stats, test
    • Replies: 4
    • Views: 2,404
    03-13-2013, 11:01 PM Go to last post
  48. Help Needed - Statistical Analysis

    Hi all, Firstly, I don't have much experience with statistics, so i hope i'll make sense! The Background I'm involved in a project with work....

    Started by pg0410‎, 03-13-2013 04:47 PM
    • Replies: 3
    • Views: 1,327
    03-13-2013, 09:31 PM Go to last post
  49. Determining Distributions

    I have two variables that I know are distributed as X^2(100) and N(100,15). The descriptive stats are: ...

    Started by BiGsombrerO‎, 03-13-2013 08:55 AM
    • Replies: 1
    • Views: 978
    03-13-2013, 02:20 PM Go to last post
  50. Lilliefors confidence bounds

    Hi community, would anyone know how to calculate these? I'd like to add them to some of my charts in excel.

    Started by bjbreitling‎, 03-13-2013 01:32 PM
    • Replies: 0
    • Views: 3,010
    03-13-2013, 01:32 PM Go to last post
  51. Question Time Series Data- Fish Diet

    My time series spans 13 years. There are 30-60 fish stomachs for each year of the study. Each stomach has typically 3-8 prey items inside. The...

    Started by chares‎, 03-13-2013 12:22 PM
    data, diet, fish, multiple regression, time series
    • Replies: 0
    • Views: 1,602
    03-13-2013, 12:22 PM Go to last post
  52. statistical tests

    Hi. I need you help, please!!!!! I have some data like this id a c t 1 1 1 1 2 1 1 0

    Started by slavia‎, 03-13-2013 06:43 AM
    • Replies: 8
    • Views: 1,517
    03-13-2013, 11:54 AM Go to last post
  53. How many samples do I need for allele frequency analysis?

    Hi, I want to know a proportion of alleles in a population. If a genetic locus that I'm interested in is biallelic (i.e. two alleles: A & a),...

    Started by youngukoo‎, 03-13-2013 12:22 AM
    • Replies: 0
    • Views: 949
    03-13-2013, 12:22 AM Go to last post
  54. Help in Stata; Simulation

    Hello All, I am a beginners user in Stata and I am working on an assignment that requires me to run a simulation for a regression function. I...

    Started by statabeginner‎, 03-12-2013 04:26 PM
    • Replies: 0
    • Views: 1,476
    03-12-2013, 04:26 PM Go to last post
  55. Multiple comparison test, with ambiguous labels/ranks

    In a clinical study, I have patient's health condition labeled as grade 1, 2, or 3. Some patients are labeled as "Either 1 or 2" by the doctor,...

    Started by David.danju‎, 03-12-2013 10:32 AM
    kruskal wallis, multiple comparison test, p-value
    • Replies: 3
    • Views: 1,756
    03-12-2013, 03:07 PM Go to last post
  56. SPSS Stats help URGENT

    Hey guys, I am very sorry to bother you but I am wondering if you could help me with a Stats question for a project I am working on. It is bit...

    Started by bj1541‎, 03-12-2013 09:03 AM
    • Replies: 1
    • Views: 984
    03-12-2013, 10:55 AM Go to last post
  57. Statistics question

    Hi I am working on a project and would like people's opinions on the statistics, if possible? I am looking at a new processing and cutting...

    Started by TomJ‎, 03-12-2013 02:41 AM
    • Replies: 1
    • Views: 1,135
    03-12-2013, 07:55 AM Go to last post
  58. direction of association between nominal and ordinal variables

    Hello, I have a question about which test are appropriate to find direction of association between a nominal and an ordinal variable. I have...

    Started by jacky‎, 03-11-2013 02:22 PM
    association, direction, nominal, ordinal
    • Replies: 1
    • Views: 2,176
    03-11-2013, 04:19 PM Go to last post
  59. Time-Varying VCV Matrix

    2asdfasdfasdf

    Started by Praised‎, 03-11-2013 07:38 AM
    • Replies: 0
    • Views: 2,011
    03-11-2013, 07:38 AM Go to last post
  60. Statistical tests

    Hi. I need to compare two groups of data. And a person told me that I can apply a A, M or t test. A t test I know. But, what is a A or M test?...

    Started by slavia‎, 03-08-2013 09:47 AM
    • Replies: 7
    • Views: 1,551
    03-11-2013, 05:29 AM Go to last post

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