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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: 197,168
    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: 66,955
    09-30-2005, 09:44 AM Go to last post
  1. 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: 1,304
    05-13-2015, 07:45 PM Go to last post
  2. 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: 1,164
    05-13-2015, 01:48 PM Go to last post
  3. 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: 1,559
    05-13-2015, 11:21 AM Go to last post
  4. 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: 1,578
    05-13-2015, 10:49 AM Go to last post
  5. 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: 1,759
    05-13-2015, 10:36 AM Go to last post
  6. 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: 1,042
    05-13-2015, 04:37 AM Go to last post
  7. 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: 1,198
    05-13-2015, 02:55 AM Go to last post
  8. 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: 2,048
    05-12-2015, 11:47 PM Go to last post
  9. 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: 1,003
    05-12-2015, 11:37 PM Go to last post
  10. 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: 1,611
    05-12-2015, 01:35 PM Go to last post
  11. 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: 2,159
    05-12-2015, 12:19 PM Go to last post
  12. 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: 973
    05-12-2015, 09:56 AM Go to last post
  13. Time Series

    I have a data set of daily prices of some product. But for some days there are more than one price per day. Then is this a time series or not?

    Started by Chirantha89‎, 05-12-2015 12:03 AM
    • Replies: 0
    • Views: 877
    05-12-2015, 12:03 AM Go to last post
  14. Directed acyclic graph

    Hello I'm a beginner at epidemiology and have an assignment where I'm trying to create a DAG using dagitty to determine what to adjust for when...

    Started by abstract1977‎, 05-11-2015 08:54 AM
    confounding, dag, epidemiology
    • Replies: 1
    • Views: 1,070
    05-11-2015, 04:27 PM Go to last post
  15. A parametric hypothesis testing problem!

    Hello guys, So I have this problem I am trying to solve and it

    Started by glorean‎, 05-10-2015 03:55 PM
    • Replies: 1
    • Views: 1,171
    05-11-2015, 08:20 AM Go to last post
  16. Time Intervals in R

    I want to get some value to be printed if some input date is in between some two dates. How can I do this in R? The algorithm is as follows. If(x...

    Started by Chirantha89‎, 05-11-2015 04:14 AM
    • Replies: 2
    • Views: 1,492
    05-11-2015, 04:55 AM Go to last post
  17. Welch t-test?

    Several years ago, with the help of some experts in statistics, I selected the Welch t-test for an experiment of mine. I'm now reviewing that...

    Started by makilahy‎, 04-30-2015 09:38 PM
    • Replies: 10
    • Views: 3,917
    05-11-2015, 01:43 AM Go to last post
  18. Lightbulb ANOVA or Chi Square for Nominal Non Parametric Data

    Dear TalkStat Forum members, I was hoping to get some advice over whether I am using the appropriate test for data that I have. The notes of 70...

    Started by DeeD‎, 05-08-2015 03:37 PM
    chi square, nominal, non-parametric
    • Replies: 2
    • Views: 1,640
    05-11-2015, 01:36 AM Go to last post
  19. unequal sampling effort - binomial generalized linear model - offset

    How to take into account heterogeneity in sampling effort in a binomial glm (presence absence) ? Edit I want to link species presence with...

    Started by Audrey‎, 05-10-2015 01:44 AM
    binomial glm, offset, unequal sampling effort
    • Replies: 3
    • Views: 1,846
    05-10-2015, 11:50 PM Go to last post
  20. stepAIC - summary(binomial GLM) - insignificant variables

    Why stepAIC gives a model with unsignificant variables in the summary(model) ? I would like to know what environmental variables allows to explain...

    Started by Audrey‎, 05-10-2015 01:41 AM
    insignificant, interpretation, stepaic, summary(glm)
    • Replies: 4
    • Views: 2,173
    05-10-2015, 11:41 PM Go to last post
  21. ARMA Question

    Hi guys, I would really appreciate your input into this I have a question which instructs me to construct an ARMA model based on a regression...

    Started by statman1999‎, 05-10-2015 09:55 PM
    • Replies: 0
    • Views: 1,230
    05-10-2015, 09:55 PM Go to last post
  22. When to use which statistics? Is it correct like this?

    I never had statistics in school and I'm not in college yet so I try to teach in to myself now. That's why everything I write now could be plain...

    Started by mathsucks‎, 05-10-2015 01:34 PM
    confidence interval, hypothesis, population, sample, test
    • Replies: 1
    • Views: 999
    05-10-2015, 03:43 PM Go to last post
  23. Principle component analysis and factor loadings questions (URGENT)

    Dear all We have performed PCA on a dataset and have the following results: Eigenvalues: Factor 1: 2.68 Factor 2: 0.23 Factor 3: 0.08

    Started by mahdi207‎, 05-10-2015 03:03 PM
    • Replies: 0
    • Views: 883
    05-10-2015, 03:03 PM Go to last post
  24. Post Help Would anyone please show me how to do this exercise. Thanks a lot

    Suppose we have a sample X1,....Xn from a distribution with a pdf f(x) = -θ^x log(θ), with 0 <θ <1. 1) Find a 1-dimensional sufficient statistic...

    Started by Hohoho‎, 05-08-2015 12:34 PM
    • Replies: 1
    • Views: 1,246
    05-08-2015, 12:42 PM Go to last post
  25. F test intepretation

    I want to perform f test of the attached data, what are the steps in excel and how can I intrepret the results Thank you.

    Started by thong127‎, 05-01-2015 02:10 PM
    • Replies: 10
    • Views: 1,934
    05-08-2015, 09:59 AM Go to last post
  26. Testing difference between two surveys related to stocks (not means)

    Hi I need to answer if there is a significant difference between a stock obtained from two surveys. I've researched and i only find info about means...

    Started by jfca283‎, 05-08-2015 09:44 AM
    • Replies: 0
    • Views: 925
    05-08-2015, 09:44 AM Go to last post
  27. Dissertation test results. Help!!!

    Hi Guys, I was just wondering if you could help me out with some statistics stuff as I'm having a little trouble with interpreting my dissertation...

    Started by Ross Millington‎, 05-08-2015 09:27 AM
    analysis help, anova, dissertation, linear regression, two-way anova
    • Replies: 0
    • Views: 980
    05-08-2015, 09:27 AM Go to last post
  28. Removing outliers - endless story?

    I've been collecting some data for the first time, investigating differences between three groups of people and their numbers of hospital visits....

    Started by nilssonp386‎, 03-29-2015 04:06 PM
    2 Pages
    1 2
    • Replies: 18
    • Views: 3,458
    05-08-2015, 08:24 AM Go to last post
  29. Basic averages question

    I am trying to work out the total average from a set of 5 averages. See below: Class 1: Total number of weeks = 12 Total number of hours =...

    Started by GF23‎, 05-07-2015 07:29 AM
    • Replies: 2
    • Views: 1,401
    05-08-2015, 03:01 AM Go to last post
  30. Buffon's needle/ Monte Carlo simulations

    Hi, I've recently took M.C estimation course and we learned to evaluate pi with Buffon's needle. The probability of the needle intersecting the...

    Started by ordeal1234‎, 05-08-2015 02:27 AM
    • Replies: 0
    • Views: 1,670
    05-08-2015, 02:27 AM Go to last post
  31. Age-Period-Cohort Model

    I am looking for feedback on the feasability of a model I am specifying. I have four cohorts of longitudinal data. Each cohort contains ten years...

    Started by Lazar‎, 05-07-2015 09:59 PM
    • Replies: 0
    • Views: 1,108
    05-07-2015, 09:59 PM Go to last post
  32. Trying to solve Stat Problem

    Hi guys, Im trying to solve stat problem and need your help. The problem is as below. A researcher conduct a survey to determine whether the...

    Started by Stat_Wolf‎, 05-07-2015 03:22 PM
    • Replies: 0
    • Views: 1,108
    05-07-2015, 03:22 PM Go to last post
  33. T series stationarity

    hay guys, i'm working on garch models, but a cant turn my returns stationary. how can i do it? i've tried whit log return (logxt - logxt-1) but...

    Started by tyu90‎, 05-07-2015 11:47 AM
    econometrics, garch, series
    • Replies: 0
    • Views: 1,179
    05-07-2015, 11:47 AM Go to last post
  34. Compatibility of different numerical evaluations (mean averages, SD rates)

    Dear all, I would like to make the results from two surveys compatible: In the first survey, numerical values are elicited from native...

    Started by jstorc‎, 05-07-2015 09:28 AM
    • Replies: 0
    • Views: 1,238
    05-07-2015, 09:28 AM Go to last post
  35. T distribution - basic question I think

    Hello, Is it possible to use a t test to test whether an individual observation is from the same population as a (small) sample?

    Started by Bh78‎, 05-06-2015 03:16 PM
    t distribution
    • Replies: 7
    • Views: 1,364
    05-07-2015, 09:04 AM Go to last post
  36. Comparing groups?

    Hi, I got a homework that I really don't now how to deal with. It goes: An investigator wants to compare the life lengths of Brand A with those...

    Started by Rusty‎, 05-07-2015 03:18 AM
    • Replies: 0
    • Views: 1,492
    05-07-2015, 03:18 AM Go to last post
  37. How can I find out, if subscales are independent?

    I need to find out, if four subscales of a scale a independent from each other in my sample. A correlation with all four is a good start, so I did...

    Started by LtStarbuck‎, 04-14-2015 08:40 AM
    2 Pages
    1 2
    • Replies: 26
    • Views: 8,069
    05-06-2015, 10:44 AM Go to last post
  38. Calculating a one-way anova with just means, stdev, and sample sizes

    Hi How can you determine the sum of squares total, sum of squares within and between, only knowing the mean, standard deviation and sample size...

    Started by glwc87‎, 05-06-2015 06:05 AM
    biostatistics, mathematical statistics
    • Replies: 1
    • Views: 2,158
    05-06-2015, 08:27 AM Go to last post
  39. ARMA interpretation

    Hello, I'm currently working on ARMA models and I'm trying to understand if the number of birds seen one year depends on the number of birds...

    Started by victornitho‎, 05-06-2015 06:54 AM
    • Replies: 0
    • Views: 1,069
    05-06-2015, 06:54 AM Go to last post
  40. preparing to get a job

    hi all i am a statistical engineer with no job for a year know , in fact last year i faced many problems that affect my psychology(overwork). I...

    Started by prince20‎, 05-06-2015 03:45 AM
    • Replies: 0
    • Views: 1,232
    05-06-2015, 03:45 AM Go to last post
  41. Finding confidence interval

    I have a large data set of price (around 4000 data). By using this data set I want to find a representative value which represents the whole data...

    Started by Chirantha89‎, 05-05-2015 06:44 AM
    • Replies: 4
    • Views: 1,437
    05-05-2015, 10:37 PM Go to last post
  42. Could someone verify my logic for managing probability distributions in an experiment

    I'm not well versed in stats lingo, but am hoping my logic in the concepts here makes sense and is correct. Often in my work (measuring electrical...

    Started by tkessler‎, 05-05-2015 01:16 PM
    expectation, probability distribution, sample distribution
    • Replies: 0
    • Views: 1,287
    05-05-2015, 01:16 PM Go to last post
  43. t-test interpretation

    Hi All, Can you please help me how to interpret the result of my t-test t-Test: Two-Sample Assuming Equal Variances Method...

    Started by thong127‎, 05-04-2015 03:08 PM
    • Replies: 7
    • Views: 2,162
    05-05-2015, 11:38 AM Go to last post
  44. Talking Standardised Scoring

    I have a dataset, which produces scores on a test. The best scores are those which are closest to zero, and then as scores get bigger this is worse....

    Started by phillippeflopp‎, 05-05-2015 10:50 AM
    • Replies: 1
    • Views: 962
    05-05-2015, 10:55 AM Go to last post
  45. Hypothesis Testing Help

    Hello fellow statisticians! it's been awhile since I've done stats and everything has completely escaped me. I'm trying to conduct hypothesis...

    Started by qwertymouse‎, 05-05-2015 09:22 AM
    before and after, chi square test, control variable, hypothesis testing, poisson distribution
    • Replies: 0
    • Views: 609
    05-05-2015, 09:22 AM Go to last post
  46. Comparison of Groups geochem data-How to go about showing the statisical significance

    Hi everyone, I just stumbled across your site; I am learning statistics by myself for my thesis (Bear with me please and sorry if I posted this in...

    Started by Geochemical Samples‎, 05-05-2015 08:20 AM
    • Replies: 0
    • Views: 1,159
    05-05-2015, 08:20 AM Go to last post
  47. Solutions to problems in Mathematical statistics with applications, Wackerly.

    Hey everyone. Can someone help me find solutions for the problems in the book mentioned in the titte? I am specielly interested in solutions to...

    Started by koba12ab‎, 05-03-2015 10:37 AM
    • Replies: 1
    • Views: 2,999
    05-05-2015, 06:03 AM Go to last post
  48. How to prepare for an exam that's in a month?

    Hi, I have an exam coming up soon for university (http://handbook.uws.edu.au/hbook/unit.aspx?unit=300700.5) for the unit "Statistical Decision...

    Started by Fox‎, 05-05-2015 01:24 AM
    • Replies: 0
    • Views: 1,138
    05-05-2015, 01:24 AM Go to last post
  49. Understanding Heteroskedasticity

    For the following statements I need to state whether they are true or false with brief reasoning: a) “If heteroskedasticity is present, the...

    Started by dingo007‎, 05-04-2015 11:16 PM
    • Replies: 0
    • Views: 1,414
    05-04-2015, 11:16 PM Go to last post
  50. Could you please confirm that my formulas are correct?

    Hi everyone, Our instructors allowed us to come up with our own problem for which we had to find the solution for. Below is what my team member...

    Started by Castillb‎, 05-04-2015 04:13 PM
    • Replies: 2
    • Views: 1,262
    05-04-2015, 04:54 PM Go to last post
  51. Confidence Interval homework help

    This is the only part of our homework I am not understanding... A.)If the 95% confidence interval for the population mean is (6,20), what is the...

    Started by jford1‎, 05-01-2015 04:50 PM
    confidence intervals
    • Replies: 4
    • Views: 1,549
    05-04-2015, 04:47 PM Go to last post
  52. Geometric Distribution Problem.

    Hi everyone! This is my first post here. I am currently a little stuck on a university workshop question. I was hoping to see my tutor during her...

    Started by Lucror123‎, 05-04-2015 01:04 PM
    • Replies: 2
    • Views: 1,609
    05-04-2015, 01:22 PM Go to last post
  53. Making sense of the parameter delta in this equation.

    Hello, I was reading this paper about pollen dispersal directionality and I am trying to make sense of the so-called directionality parameter...

    Started by Remi‎, 05-04-2015 10:34 AM
    biological statistics, logistic regression, mathematical statistics
    • Replies: 1
    • Views: 1,389
    05-04-2015, 10:35 AM Go to last post
  54. Dealing with missing value in dataset

    My dataset contains matrix of 1k x 1k and each points having value ranging from 1 to 100. if value is 1, means that point value is lost. To...

    Started by nlper‎, 05-04-2015 10:34 AM
    missing values, statistics
    • Replies: 0
    • Views: 774
    05-04-2015, 10:34 AM Go to last post
  55. Mixed ANOVA with covariate - interpretation help!!!

    Hi, I conducted the following mixed ANOVA with a covariate: 2 x groups (BS factor) 3 x Switching as repeated measures (WS factor) IQ as...

    Started by qwertz1899‎, 05-04-2015 04:43 AM
    covariate, interpretation, mixed anova
    • Replies: 3
    • Views: 2,650
    05-04-2015, 07:27 AM Go to last post
  56. Negative confidence intervals in regression

    Hi all, So I'm really stumped. Basically I have a negative standardised coefficient value of -0.35, and a 95% CI equals (-0.47, -0.23). I'm having...

    Started by redsocks‎, 05-01-2015 12:53 AM
    coefficient, confidence-interval, negative
    • Replies: 12
    • Views: 3,879
    05-03-2015, 10:20 PM Go to last post
  57. Assistance with ANOVA test

    Hi everyone, I am analyzing data from 5 winogradsky columns and am looking at how sulfate concentrations change for 5 different depth categories:...

    Started by microbe22‎, 05-03-2015 07:30 PM
    • Replies: 0
    • Views: 945
    05-03-2015, 07:30 PM Go to last post
  58. Result for study falls outside sample size margin of error?

    Hi all, I was wondering it means for your results if they fall outside the margin of error used when calculating a sample size? Say I expected a...

    Started by rach293‎, 05-03-2015 01:51 PM
    • Replies: 0
    • Views: 458
    05-03-2015, 01:51 PM Go to last post
  59. Interpreting 2x4 repeated measures ANOVA

    Hello, I am having some trouble interpreting the results of a 2x4 repeated measures ANOVA. Participants in my study ran through 4 music...

    Started by mcgreave‎, 05-02-2015 02:05 AM
    • Replies: 1
    • Views: 1,209
    05-02-2015, 08:27 AM Go to last post
  60. How to calculate binomial z-scores?

    Hi, Basically I am trying to calculate binomial z-scores to determine individual significance of left or right. For example say there is a person...

    Started by dcl92‎, 05-02-2015 06:56 AM
    • Replies: 0
    • Views: 1,044
    05-02-2015, 06:56 AM Go to last post

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