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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: 196,968
    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: 66,862
    09-30-2005, 09:44 AM Go to last post
  1. Can anyone help me with these questions?

    this thread no longer exists

    Started by dowkahs‎, 08-10-2013 05:59 PM
    • Replies: 1
    • Views: 2,073
    08-10-2013, 07:48 PM Go to last post
  2. Sampling from a Sub Sample and Normality Assumption

    Say I have sample data (let's call it XYZ) that is drawn from another survey (the US Current Population Survey). This entails that the universe of my...

    Started by StatsScared‎, 08-07-2013 11:47 AM
    sampling normality
    • Replies: 10
    • Views: 2,765
    08-10-2013, 03:36 PM Go to last post
  3. Scoring Game Stats - finding lowest price with multiple variables

    Not sure I'm in the right place.... I have to develop a score system. A bidder will give a fixed bid "B" and a discount on consumables "D"...

    Started by Syntax‎, 08-09-2013 04:33 PM
    • Replies: 0
    • Views: 2,498
    08-09-2013, 04:33 PM Go to last post
  4. Comparring Means with Different Variances

    Hello Im comparring mean values of densities for this experiment Im conducting and i have this question: Is it a problem that I am using...

    Started by RorschachDK‎, 08-09-2013 04:52 AM
    • Replies: 3
    • Views: 1,284
    08-09-2013, 09:11 AM Go to last post
  5. Combining probability distribution functions

    Hi, I'm comparing different measurement methods. I listed and derived an equation for each error component per measurement method and calculated...

    Started by Hermano‎, 08-09-2013 06:47 AM
    monte-carlo, probability distribution
    • Replies: 0
    • Views: 1,603
    08-09-2013, 06:47 AM Go to last post
  6. is there interaction effect in RCBD with a single observation per cell ?

    The statistical model for a Randomized Complete Block Design (RCBD) with a single observation per cell is:...

    Started by Jesmin‎, 08-08-2013 08:08 PM
    anova, experimental design, interaction effect
    • Replies: 1
    • Views: 1,057
    08-08-2013, 08:21 PM Go to last post
  7. Statistical model for *Complete Randomized design (CRD)*

    Consider the statistical model for *Complete Randomized design (CRD)* y_{ij} = \mu + \tau_i + \epsilon_{ij}, \quad i=1,\ldots ,k, \quad j=1,\ldots,...

    Started by Jesmin‎, 08-08-2013 07:41 PM
    anova, f distribution, hypotheses, sum of square type
    • Replies: 0
    • Views: 2,795
    08-08-2013, 07:41 PM Go to last post
  8. Analyzing regression based on different levels of a variable.

    Hello all, I need to compare effects on a dependent variable based on different levels of an independent one, x2 in the attached equation. I want...

    Started by toastintheshell‎, 08-08-2013 09:48 AM
    • Replies: 0
    • Views: 1,148
    08-08-2013, 09:48 AM Go to last post
  9. Challenging stat question: nonlinear mixed model or something else?

    Hello all, I have measured the nutrient release over time from four different types of soil (A, B, C, D, E) subsequent to flooding with rainwater....

    Started by hydrocynus‎, 08-07-2013 05:45 PM
    • Replies: 1
    • Views: 869
    08-08-2013, 09:31 AM Go to last post
  10. Best suitable statistics

    Hi guys, I'm trying to see if different treatments can be related (or similars), although they are independent and unrelated treatments. Since I'm...

    Started by t.souza‎, 08-08-2013 09:25 AM
    biological statistics, microarray
    • Replies: 0
    • Views: 848
    08-08-2013, 09:25 AM Go to last post
  11. Unhappy Kruksall-Wallis VS Chi-Squared

    Hello, I'm working on an MSc project and struggling with the stats side of things (I'm a linguist, not a statistician). I have data on 2...

    Started by beaney28‎, 08-08-2013 04:55 AM
    chi square, help please, kruksall-wallis, spss statistics
    • Replies: 1
    • Views: 1,267
    08-08-2013, 07:58 AM Go to last post
  12. Percentage Change - Create other metric to show importance of change

    Hi, I have a list of countries with 2 columns of count values that I have calculated the percent change between. Similar to the attached. ...

    Started by sbergquist‎, 08-07-2013 06:31 PM
    • Replies: 0
    • Views: 1,563
    08-07-2013, 06:31 PM Go to last post
  13. Autocovariance Function

    Hey there! I have a question relating to Applied Time Series that I'm having a bit of trouble with. For all parts of this question, let Z_t; t...

    Started by panderson‎, 08-06-2013 11:17 PM
    autocovariance, stationarity, time series
    • Replies: 3
    • Views: 1,522
    08-07-2013, 06:43 AM Go to last post
  14. Hypothesis Testing for Standard Deviation

    Hello! Attempting to complete this problem: -- The observations (volume in m^3/ha) of 10 prism plots from a given forest type are summarized...

    Started by scvan87‎, 08-07-2013 01:26 AM
    hypothesis testing, level of significance, null hypothesis, standard deviation, variance
    • Replies: 1
    • Views: 1,193
    08-07-2013, 06:40 AM Go to last post
  15. 2 step questions and how to model them

    A common set of items in large government funded databases like PISA and TIMSS are two stage questions. For example I have a set of items from the...

    Started by Lazar‎, 08-06-2013 07:04 PM
    • Replies: 3
    • Views: 1,425
    08-07-2013, 02:45 AM Go to last post
  16. Methdology for finding confidence interval

    I have 1 year hourly data i.e. 8760 data points. The data basically represents difference between predicted and actual temperature at a certain...

    Started by Vatsa‎, 08-06-2013 10:38 AM
    • Replies: 2
    • Views: 1,357
    08-06-2013, 11:37 AM Go to last post
  17. Graphing Effect Size Comparions

    Hi! I would like to take a single school's achievement data (as an effect size) and plot that on a scatterplot graph with the matched district and...

    Started by akbs‎, 08-06-2013 09:27 AM
    effect size, graphing, variable coding
    • Replies: 0
    • Views: 1,738
    08-06-2013, 09:27 AM Go to last post
  18. Performing a ttest between two independent groups

    Hi Friends, I recently came across this question - If you have two groups-A and B, where the groups are having salary data for 5 independent...

    Started by pkdash83‎, 08-06-2013 01:06 AM
    • Replies: 0
    • Views: 1,062
    08-06-2013, 01:06 AM Go to last post
  19. Discrepancy between paired t-test and independent t-test results

    Hi, I'm analysing pre- and post- data collected from two groups. Group 1 consists of 18 members who received treatment. Group 2 consists of...

    Started by cheekychica‎, 07-31-2013 10:36 AM
    • Replies: 11
    • Views: 3,575
    08-05-2013, 11:15 AM Go to last post
  20. Is Pearson correlation suitable for my analysis? Suggestions appreciated!

    Hi guys, it's been weeks since I started to worry about my data analysis. I work with microarray data analysis, meaning that a have several datasets...

    Started by t.souza‎, 08-05-2013 10:17 AM
    biological statistics, statistical help
    • Replies: 0
    • Views: 1,057
    08-05-2013, 10:17 AM Go to last post
  21. paired t-test or repeated measurments ANOVA

    Hello Given a group where you run 2 models to obtain a parameter, and the goal is to compare both parameters. But not all individuals tested in...

    Started by ndb86‎, 08-05-2013 07:17 AM
    anova, paired t-test, repeated measurements
    • Replies: 1
    • Views: 1,305
    08-05-2013, 10:16 AM Go to last post
  22. Validating hypothesis with dependent data

    Hello, I have results for a series of experiments. For each experiment I have three repeated measurements of one subject and three repeated...

    Started by genesup‎, 08-05-2013 05:57 AM
    • Replies: 1
    • Views: 1,132
    08-05-2013, 09:53 AM Go to last post
  23. Least significant difference test

    Dear Sir. Please, I badly in need to figure out the difference between least significant difference test LSD, protected least significant difference...

    Started by brynn‎, 08-04-2013 11:56 PM
    • Replies: 0
    • Views: 1,631
    08-04-2013, 11:56 PM Go to last post
  24. Need help determining the benefits/risk of each options

    Hi! I'm new to the forum I'm currently trying to design a game in which a number would be picked at random between a given integer or rule...

    Started by beamthegreat‎, 08-04-2013 09:42 PM
    • Replies: 0
    • Views: 1,097
    08-04-2013, 09:42 PM Go to last post
  25. Correlating Likert scales of different length.

    Hi I have a question regarding correlating Likert scales of different length. I have 2 constructs one is measured on 6 point Likert sale and...

    Started by Mohamed Afifi‎, 08-04-2013 05:48 PM
    • Replies: 2
    • Views: 2,200
    08-04-2013, 08:02 PM Go to last post
  26. calculating STDs of ratios HALP

    I am trying to determine the standard deviation for ratio of fouls to (fouls+ballsinplay) by pitchcount (0-0,0-1,etc). The data I have is real, from...

    Started by madyohe‎, 08-04-2013 05:43 PM
    • Replies: 0
    • Views: 1,273
    08-04-2013, 05:43 PM Go to last post
  27. Community Attitudes Towards Mentally Ill (Taylor & Dear,1981)

    Was wondering if anyone could be assistance to me, i'm using this CAMI likert scale, its a 40 item questionnaire based on a 5 response likert scale -...

    Started by kavanagh30‎, 10-08-2009 01:15 PM
    • Replies: 1
    • Views: 8,177
    08-04-2013, 11:33 AM Go to last post
  28. Properties of Summation and Expected Value question

    Hello, I'm doing an intro to econometrics course but we weren't taught properties of variances, expected values, and sigma notation and I'm getting...

    Started by toastintheshell‎, 08-03-2013 11:26 AM
    • Replies: 2
    • Views: 8,014
    08-03-2013, 12:30 PM Go to last post
  29. Pooled variance twist

    I am trying to calculate the error for a PCR relative gene expression experiment (ΔΔCt). In this type of experiment, you take several measurements...

    Started by JTA‎, 08-02-2013 03:28 PM
    • Replies: 0
    • Views: 1,129
    08-02-2013, 03:28 PM Go to last post
  30. Red face A simple question about correlation___new comer

    Hi everybody, I'm new here =) I like statistics!!! Now comes my question: Known item-total correlation of each item in a scale, can the...

    Started by Fran‎, 08-02-2013 12:24 AM
    • Replies: 3
    • Views: 1,229
    08-02-2013, 01:56 PM Go to last post
  31. Smile Deriving Index Weights from Negative Binomial Model

    Hello, I have the following problem: I have count data as a dependent variable and ran a neg binomial model with a bunch of independent...

    Started by Stacy_MUN‎, 08-02-2013 07:29 AM
    • Replies: 1
    • Views: 927
    08-02-2013, 10:09 AM Go to last post
  32. gap significance testing

    I have two waves of data and within each wave I have a difference between two brands. Eg Wave 1 - (Brand 2 - Brand 1) = 2% Wave 2 - (Brand 2 -...

    Started by paulfiner‎, 08-02-2013 07:51 AM
    • Replies: 1
    • Views: 2,386
    08-02-2013, 09:31 AM Go to last post
  33. Outliers and correlation

    Hi all Im working on small size sample (17) . and need to do correlation for alot of prameters my questions is : -is removing the outliers is...

    Started by lora‎, 08-01-2013 12:05 PM
    correlatiomn, outliers
    • Replies: 8
    • Views: 2,832
    08-02-2013, 06:08 AM Go to last post
  34. Determining effects of different levels of treatment on observations

    I have been given a data set that consists of several observations made on a number of subjects at different times. In between each observation time...

    Started by downers‎, 08-01-2013 06:56 PM
    • Replies: 0
    • Views: 1,237
    08-01-2013, 06:56 PM Go to last post
  35. Hypothesis test for a sample

    Hello I was wondering if it was possible to make hypothesis tests about the mean value for a sample? As far as i know it is only possible with...

    Started by RorschachDK‎, 08-01-2013 04:01 AM
    • Replies: 2
    • Views: 1,581
    08-01-2013, 11:08 AM Go to last post
  36. 2-way ANOVA for combing results

    Hello I am working in a biological science and am looking for a valid way of combining results from independent experiments. I am inexperienced in...

    Started by inov‎, 07-31-2013 01:41 PM
    • Replies: 0
    • Views: 1,511
    07-31-2013, 01:41 PM Go to last post
  37. is taking the average of pre and post scores common practice?

    My committee recommended taking the average of pre and post tests scores for my 4 DV and running a MANOVA with group as the IV. The 4 DV were tests...

    Started by ruthg‎, 07-30-2013 06:52 PM
    • Replies: 3
    • Views: 1,518
    07-31-2013, 07:12 AM Go to last post
  38. Need a nudge with a doe homework problem

    I have the attached problem to solve for an on-line class and can't reach my instructor by phone or email, so I'm hoping someone here can give me a...

    Started by turkldo‎, 07-30-2013 03:31 PM
    • Replies: 7
    • Views: 1,479
    07-31-2013, 07:04 AM Go to last post
  39. Which analysis do I use?

    Hello everybody, I am doing neuroscience research and now I have come to the point where I have to do the statistical analysis... And I'm stuck. ...

    Started by Foon‎, 07-31-2013 05:16 AM
    • Replies: 0
    • Views: 1,123
    07-31-2013, 05:16 AM Go to last post
  40. Need help with a project...new member.

    Hi everyone, I need some help formulating an idea or hypothesis for a project for college intro to stats. The project required me to obtain my...

    Started by capceo‎, 07-30-2013 10:56 PM
    • Replies: 4
    • Views: 1,005
    07-31-2013, 03:03 AM Go to last post
  41. Most suitable correlation test?

    Hello all, Forgive the novice question, but I am seeking to establish if there exists any correlation between website traffic and/or Google...

    Started by noidea‎, 07-28-2013 07:05 PM
    • Replies: 6
    • Views: 1,430
    07-31-2013, 02:13 AM Go to last post
  42. What're the rules to calculate measurement error used in formulas?

    I am having trouble finding the rules to use when determining the total error from a calculation having multiple measurement errors. I remember if...

    Started by layerlapse‎, 07-23-2013 10:19 PM
    • Replies: 4
    • Views: 1,826
    07-30-2013, 10:49 PM Go to last post
  43. Finding Collinearity Among Predictor Variables

    I have been reading about how (multi)-collinearity among predictor variables can be determined by looking at the condition number, or smallest...

    Started by OtagoHarbour‎, 07-30-2013 06:45 PM
    collinearity, predictors
    • Replies: 0
    • Views: 1,118
    07-30-2013, 06:45 PM Go to last post
  44. Question regarding best way to combine testing results to demonstrate capability

    There was a study performed where a machine was used to look for defects and found 80% of the known defect amount in the sample set. Another test...

    Started by codenmae47‎, 07-30-2013 03:39 PM
    • Replies: 0
    • Views: 1,348
    07-30-2013, 03:39 PM Go to last post
  45. Probability from Mean and Standard Deviation - Please help?

    I've been working on this question all day trying to get my head around it and I just can't. I kind of understand it but get confused halfway, on all...

    Started by smd1994‎, 07-28-2013 09:02 AM
    • Replies: 12
    • Views: 4,448
    07-30-2013, 01:26 PM Go to last post
  46. Does +/- 1 mean +/-1 S.E. error when determining suitability of normality for ANOVA?

    Hi everyone, A fairly straightforward question (I hope!) I would be grateful if you would help with. Shapiro-Wilks tests show my data to be...

    Started by benjwalt‎, 07-30-2013 02:52 AM
    • Replies: 2
    • Views: 1,957
    07-30-2013, 08:48 AM Go to last post
  47. Is a Paired T Test appropriate

    Hi, i have a group of 10 whole tissue pieces that i have tested at two time points and ultimately i want to be able to report if there is a...

    Started by siobhan‎, 07-30-2013 05:39 AM
    • Replies: 2
    • Views: 1,751
    07-30-2013, 07:29 AM Go to last post
  48. SPSS: combine two variables with overlapping values into one

    Hello My data consists of two waves. For the variable 'marital status', the value has been left blank in the second wave if it did not change...

    Started by ax3113‎, 07-30-2013 04:42 AM
    combine variables, if do, overlapping values, spss
    • Replies: 0
    • Views: 4,014
    07-30-2013, 04:42 AM Go to last post
  49. Multinomial likelihood for large number of groups

    I am trying to investigate the following problem using multinomial likelihoods and could really do with some advice regarding it's appropriateness...

    Started by SlowlyFailing‎, 07-29-2013 02:09 PM
    r multinomial likelihood
    • Replies: 4
    • Views: 2,191
    07-30-2013, 03:47 AM Go to last post
  50. Ordered Probit Model for Panel Data in Stata?

    Hi there, I am having a little problem with my ordered dependent variable 'Physical Integrity Rights (PIR).' I want to study the effects of...

    Started by AnneVM‎, 07-30-2013 02:31 AM
    • Replies: 0
    • Views: 2,599
    07-30-2013, 02:31 AM Go to last post
  51. SPSS - Chi squared test with set expected values and option for post-hoc?

    Hi there, I am trying to perform a chi-square test on SPSS. My data looks something like the following: Flag 1 Flag 2 Flag 3 ...

    Started by danadmiller‎, 07-29-2013 03:25 PM
    • Replies: 1
    • Views: 1,502
    07-29-2013, 03:29 PM Go to last post
  52. Categorial measure of association: interpretation

    Hi Guys, I was reading the book by Healey "The Essentials of Statistics: A Tool for Social Research", and came accross a table with the...

    Started by gianmarco‎, 07-29-2013 10:31 AM
    • Replies: 3
    • Views: 1,476
    07-29-2013, 01:57 PM Go to last post
  53. Null and Alternative Hypothesis question

    Hey guys I am really stuck on this one question and have no way to go about it. I would really appreciate any help I could get. Question 4 A...

    Started by jynxster‎, 07-29-2013 12:08 PM
    alternative hypothesis, null hypothesis
    • Replies: 2
    • Views: 2,629
    07-29-2013, 12:17 PM Go to last post
  54. Difference between population standard deviation and sample standard deviation

    Hi Friends, This might be a very basic question but I'm not able to get a satisfactory answer for this from seasoned statisticians. Why do we...

    Started by pkdash83‎, 07-29-2013 06:11 AM
    • Replies: 4
    • Views: 2,113
    07-29-2013, 11:52 AM Go to last post
  55. Null and Alternative Hypothesis

    Hey guys. Here is a problem I was given and am really struggling with. I understand Null and Alternative hypothesis but having the two categories of...

    Started by jynxster‎, 07-29-2013 11:29 AM
    • Replies: 0
    • Views: 1,333
    07-29-2013, 11:29 AM Go to last post
  56. Mean value comparrison

    Hello When doing a One-Way ANOVA test with multipel samples, I testing the followin hypothesis: H0: U1=U2=U3 H1: at least two diveates...

    Started by RorschachDK‎, 07-29-2013 03:37 AM
    • Replies: 2
    • Views: 2,354
    07-29-2013, 05:36 AM Go to last post
  57. SPSS - Kolomogorov-Smirnov Test

    I am a masters student and I am trying to assess which tests to use. I am checking for normal distribution. I have conducted a Kolomogorov-Smirnov...

    Started by kmclea30‎, 07-29-2013 04:41 AM
    kolmogorov-smirnov, normal distribution, parametric test, spss
    • Replies: 1
    • Views: 2,038
    07-29-2013, 05:22 AM Go to last post
  58. Normal distribution - do it need to test that for Kendall's W

    Hello guys, i have a quick question, i am currently conducting my master thesis and am ranking some barriers according to their mean and median...

    Started by andih‎, 07-29-2013 04:05 AM
    • Replies: 0
    • Views: 1,189
    07-29-2013, 04:05 AM Go to last post
  59. Is using the Chi-squared test the right option here?

    Hi everyone, I hope this question isn't too long. I have some data that I need to statistically analyze and I think I've figured out the best way...

    Started by danadmiller‎, 07-28-2013 07:03 PM
    • Replies: 0
    • Views: 1,553
    07-28-2013, 07:03 PM Go to last post
  60. Software to Determine Data Distribution

    Does anyone know of any statistical program that takes a set of empirical data and determines what probability distribution it most closely matches?...

    Started by bscully‎, 07-22-2013 10:31 AM
    assesment, distribution, software
    • Replies: 6
    • Views: 1,515
    07-28-2013, 06:36 PM Go to last post

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