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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: 196,800
    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: 66,782
    09-30-2005, 09:44 AM Go to last post
  1. URGENT: Omitted Dummy Variable /// Multicollinearity

    Hi guys, i'm a complete newbie when it comes to statistically evaluating data for my thesis and would therefore very much appreciate your help. ...

    Started by dluc‎, 06-29-2014 03:05 PM
    dummy variable, multicollinearity, omitted dummy
    • Replies: 4
    • Views: 4,116
    06-30-2014, 05:51 PM Go to last post
  2. Cool Logistic Regression : Model Validation

    I am validating a logistic regression model. This is the first time i am validating a model. I am using split sampling method. I have split data...

    Started by Riya‎, 06-30-2014 12:13 PM
    logistic regression, model validation
    • Replies: 0
    • Views: 3,323
    06-30-2014, 12:13 PM Go to last post
  3. Confidence interval for point estimate

    Lets say I have weights of 30 random children age 10 in a village. We can assume that these weights follow a normal distibution and can estimate the...

    Started by emily.stats‎, 06-25-2014 04:20 AM
    • Replies: 2
    • Views: 1,511
    06-30-2014, 12:11 PM Go to last post
  4. Regression Analysis: One-Tail or Two-Tail?

    Hello everyone, I'm currently working on an empirical research for my university. Whilst everything has progressed quite well, I remain with one...

    Started by Grethox‎, 06-29-2014 04:29 AM
    • Replies: 2
    • Views: 1,743
    06-29-2014, 03:43 PM Go to last post
  5. Unhappy comparing two value sets of measurements

    What statistical test is appropriate when comparing two value sets of measurements, each set obtained from different device and each device does a...

    Started by wedo‎, 06-26-2014 09:50 AM
    • Replies: 3
    • Views: 1,021
    06-29-2014, 10:30 AM Go to last post
  6. Standard deviation of average market share change

    Hi guys, I have market share data for different years: (1) (2) (3) (4) (5) (6)...

    Started by CorpFinStudent‎, 06-29-2014 05:51 AM
    • Replies: 0
    • Views: 1,559
    06-29-2014, 05:51 AM Go to last post
  7. What test to use? – two continuous variables by one categorical - Stata

    Hi! Is there any way to test to see if a laboratory blood value is different between people in 2 categories while considering age? I am using...

    Started by Granger1680‎, 06-28-2014 04:29 AM
    continuous variable, stata, test to use
    • Replies: 0
    • Views: 5,588
    06-28-2014, 04:29 AM Go to last post
  8. Is my solution correct?

    The mean amount purchased by a typical customer at The Effin Computer Store is $400 with a standard deviation of $28. Assuming a normal distribution,...

    Started by Lia1990‎, 06-26-2014 11:14 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 3,654
    06-27-2014, 01:00 PM Go to last post
  9. How to estimate an index value for 2 categories with 2 different weights

    So I have multiple categories with lets say an X and Y. 1: x=2,000,000 y=400,000 2: x=50,000,000 y=10,000,000 3: x=100,000,000 y=20,000,000 so...

    Started by bluesheep‎, 06-26-2014 04:45 PM
    • Replies: 1
    • Views: 1,072
    06-27-2014, 10:38 AM Go to last post
  10. unable to find a specific way to test significance - have been looking for weeks

    Hello. I have been searching for weeks for a test that will match my needs but cannot find one. First I will share the background, then I will...

    Started by KNB‎, 06-26-2014 12:21 PM
    • Replies: 2
    • Views: 1,720
    06-27-2014, 07:28 AM Go to last post
  11. Where do a distribution's tails meet?

    Apologies for the simple question, but where does the lower tail of a (unimodal non-normal but bell-shaped) distribution finish, and the upper tail...

    Started by oktavian‎, 06-26-2014 09:01 PM
    • Replies: 0
    • Views: 1,317
    06-26-2014, 09:01 PM Go to last post
  12. Ratio as an independent variable

    Hi, I am planning to use ratio of the type of ownership as the independent variable in one of my Tobit models. I am considering three ratios;...

    Started by Fernando1981‎, 06-26-2014 07:11 PM
    • Replies: 1
    • Views: 1,079
    06-26-2014, 07:48 PM Go to last post
  13. sample size in four-group parallel design

    Dear statistics! I would be very pleasant to you if you'll send me examples or articles how to calculate sample size in four-aim parallel design....

    Started by astea‎, 06-26-2014 04:34 PM
    • Replies: 0
    • Views: 1,211
    06-26-2014, 04:34 PM Go to last post
  14. Deducing the Median and Percentiles from aggregate data

    I have two groups A and B. I have the mean, median, 25th and 75th percentiles of the data from A+B combined and A alone, as well as the number of...

    Started by BillBo‎, 06-07-2014 02:33 PM
    • Replies: 6
    • Views: 2,600
    06-26-2014, 02:56 PM Go to last post
  15. Item Analysis

    Can someone explain this to me? I don't understand what is meant by "upper" and "lower". Thanks. I do understand if there is one set of data. I...

    Started by jebckr‎, 06-25-2014 08:23 PM
    • Replies: 1
    • Views: 1,338
    06-26-2014, 06:38 AM Go to last post
  16. Space-time non-homogeneous Poisson process

    I am wondering if I want to model a space-time non-homogeneous Poisson process that has more probability of occurrence in some areas in space, how...

    Started by Ferra‎, 06-25-2014 07:50 PM
    non-homogeneous poisson, space-time poisson
    • Replies: 0
    • Views: 933
    06-25-2014, 07:50 PM Go to last post
  17. Please check my true and false over

    I would like to post my answers to some true and false questions. Can I do that.

    Started by jaklein11‎, 06-25-2014 06:55 PM
    • Replies: 1
    • Views: 1,083
    06-25-2014, 06:58 PM Go to last post
  18. Statistic Help

    Hello all - I have two questions with which I need help; any help is much appreciated!! 1. The mean number of pages a cartridge will print before...

    Started by Lia1990‎, 06-25-2014 05:06 PM
    • Replies: 2
    • Views: 1,441
    06-25-2014, 05:41 PM Go to last post
  19. percentiles

    clearly my question was stupid. i just wasnt thinking. thanks for helping me see that now

    Started by uihiba‎, 06-25-2014 11:42 AM
    • Replies: 5
    • Views: 1,556
    06-25-2014, 04:23 PM Go to last post
  20. conditional probability and time series

    I really need some help here, will appreciate any effort. I calculated time series of tidal stresses. It turned out that the probability of having...

    Started by sthoriginal‎, 06-25-2014 08:41 AM
    • Replies: 0
    • Views: 977
    06-25-2014, 08:41 AM Go to last post
  21. decile and percentile

    Hello all, I have a very basic (and silly) question, I just want to verify that I don't mix things. Is the 3rd decile the same thing as the...

    Started by Yankel‎, 06-25-2014 04:12 AM
    • Replies: 1
    • Views: 1,357
    06-25-2014, 06:46 AM Go to last post
  22. 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: 1,466
    06-25-2014, 05:58 AM Go to last post
  23. Statistical significance between datasets

    Hi, My data consists of 2 sets of data comparing the acoustic response of a bubble (y axis) with the bubble radius (x axis). The graph shows the...

    Started by JC3808‎, 06-25-2014 04:17 AM
    • Replies: 0
    • Views: 2,196
    06-25-2014, 04:17 AM Go to last post
  24. covariance matrix vs correlation matrix

    Dear all, I am now studying PCA/FA and stumbled upon following problem: if variables are measured on different scales it's reasonably obvious that...

    Started by purifyz‎, 06-22-2014 07:35 AM
    correlation matrix, covariance matrix, pca, principal components
    • Replies: 1
    • Views: 2,418
    06-24-2014, 07:52 PM Go to last post
  25. Calculating the Standard Error over an expanded time period

    Hello, I am taking measurement from a spectrometer which is measuring a light source stability. I am quantifying the stability by taking 500...

    Started by nevica‎, 06-24-2014 04:57 PM
    • Replies: 0
    • Views: 1,047
    06-24-2014, 04:57 PM Go to last post
  26. Help with Independent T-Test!

    Hi guys, Really struggling with one part of analysis of my collected data - I'm sure it's probably something quite straightforward but just can't...

    Started by herecomesthesun‎, 06-23-2014 02:34 PM
    psychology statistics
    • Replies: 3
    • Views: 1,326
    06-24-2014, 04:13 PM Go to last post
  27. Question Question on sampling and probability

    Anyone able to shed some light on the following problem? Let's say you encounter a village with 1000 inhabitants, and want to see if any of them...

    Started by xn5r‎, 06-24-2014 08:30 AM
    • Replies: 1
    • Views: 1,373
    06-24-2014, 02:30 PM Go to last post
  28. Two quick questions...

    Am I wrong in these assumptions? When the value of the residual standard error increases, this does widen our interval, right? Since the standard...

    Started by statsandfinance‎, 06-23-2014 01:51 PM
    • Replies: 2
    • Views: 1,162
    06-24-2014, 12:49 PM Go to last post
  29. 2x2 contigency table non-independent but not paired data

    I am looking at male-biased sexual size dimorphism in a bird species (males average larger than females). I am interested in the proportion of males...

    Started by stweb‎, 06-22-2014 08:26 AM
    2x2, chi-square, contigency table, mcnemar, non-independent
    • Replies: 3
    • Views: 1,317
    06-24-2014, 08:10 AM Go to last post
  30. simple main effects or simple effects - mixed model

    deleted text

    Started by Marcos_stat‎, 06-23-2014 05:02 PM
    • Replies: 0
    • Views: 1,138
    06-23-2014, 05:02 PM Go to last post
  31. Probability distribution of combinations

    Hi to everybody! I would ask an advice on an analysis that I want to do. I have n=69 balls, within 69, 17 are black balls, 29 white balls, 22...

    Started by xgabrix‎, 06-23-2014 12:04 PM
    combinations, probability distribution
    • Replies: 0
    • Views: 956
    06-23-2014, 12:04 PM Go to last post
  32. SPSS newbie

    Hi everyone, I'm a total newbie to SPSS and I have to conduct a analysis where I assess the snack consumption among the participants. They were...

    Started by listlisa‎, 06-23-2014 11:27 AM
    compute variable, consumption, spss
    • Replies: 0
    • Views: 904
    06-23-2014, 11:27 AM Go to last post
  33. Regression analysis

    The two regression lines Y on X and X on Y respectively are as follows: 3x+2y=19, 3y+9x=46, find : ratio of variance of X to that of variance of Y. ...

    Started by MTE-11‎, 06-20-2014 09:18 AM
    • Replies: 2
    • Views: 1,321
    06-23-2014, 07:05 AM Go to last post
  34. Median, mean and mode, and the symmetry of a distribution

    Hello I know that when the mean=median=mode, the distribution is symmetric and with a bell shape. I also know that when the mean=median it is...

    Started by Yankel‎, 06-21-2014 02:18 AM
    • Replies: 2
    • Views: 1,965
    06-23-2014, 07:02 AM Go to last post
  35. number of combinations

    hi! i need help. if i want to write all sorts of possible combinations using binary numbers 1 and 0, a number of combinations is 2^n. If I want to...

    Started by maiden‎, 06-22-2014 05:47 PM
    • Replies: 2
    • Views: 1,333
    06-23-2014, 05:09 AM Go to last post
  36. Statistically, I Am An Idiot ;). Please help

    I am not very mathematically minded and am taking my first class in statistics. To make matters worse, I am taking an online class from a crappy...

    Started by paulutions‎, 06-22-2014 01:26 AM
    • Replies: 1
    • Views: 1,277
    06-22-2014, 07:52 AM Go to last post
  37. Interpretation of disappearing main effect when including interaction term

    I have an IV that is continuous and an IV that is dichotomous. When I run a regression with these two variables only, both variables are significant....

    Started by carlson2010‎, 05-08-2011 11:38 AM
    • Replies: 2
    • Views: 3,949
    06-22-2014, 06:58 AM Go to last post
  38. Need a way to rank the products from data

    Hi All. I have a set of data for different products. I want to grade the products from 1 to 4. With 4 being the best. Please tell me how to do it?...

    Started by some_cool‎, 06-19-2014 09:14 AM
    homework help, statistics
    • Replies: 3
    • Views: 1,481
    06-21-2014, 11:18 PM Go to last post
  39. Profiling a Number Series

    Hi everyone, I'm new here. My question is how do you profile a series to determine what kind of distribution it is? For example a series of...

    Started by quitecool‎, 06-20-2014 11:27 AM
    distribution, profiling
    • Replies: 2
    • Views: 1,164
    06-21-2014, 08:49 PM Go to last post
  40. Statistics - Visualization

    There is only so much excel, SAS, R, JMP, and whatever software you use can do in terms of helping people understand your data. I want to explore...

    Started by agp‎, 09-11-2013 11:33 AM
    • Replies: 9
    • Views: 1,956
    06-21-2014, 04:46 PM Go to last post
  41. correction multiple testing and aligned rank transformation

    Hi everyone, I have two statistics questions I am really stuck on, hope you can heelp! I have grown two plant species in two fifferent lighting...

    Started by joey‎, 06-18-2014 12:05 PM
    • Replies: 1
    • Views: 2,055
    06-21-2014, 12:13 PM Go to last post
  42. Determining whether variables are exchangeable

    Let X_0,X_1,....,X_n denote i.i.d. real valued r.v.'s. For every definition of Y_1 ,..., Y_n below, say whether or not Y_1 ,..., Y_n are...

    Started by ishihara‎, 06-20-2014 10:05 PM
    • Replies: 0
    • Views: 1,433
    06-20-2014, 10:05 PM Go to last post
  43. Proving convergence of conditional probability

    X and Y are real-valued random variables such that the distribution of (X,Y) is absolutely continuous with density function p and let px denote the...

    Started by ishihara‎, 06-20-2014 08:55 PM
    • Replies: 0
    • Views: 1,004
    06-20-2014, 08:55 PM Go to last post
  44. Two unequal number patient sets--different treatments--how to compare outcomes?

    Hello, I am new to the forum, but I have been following various threads for a while. I recently was asked to help with the statistics for a...

    Started by Jezza‎, 06-19-2014 03:46 PM
    • Replies: 1
    • Views: 927
    06-20-2014, 06:30 AM Go to last post
  45. Question Bonferroni correction for two GLMM models

    Hi All, A reviewer of my manuscript suggested to apply a Bonferonni correction to my two models of GLMM, which are related to each other. I...

    Started by SVB‎, 06-19-2014 02:23 PM
    • Replies: 0
    • Views: 1,208
    06-19-2014, 02:23 PM Go to last post
  46. Which statistical test to compare polar coordinates?

    Hi Guys. I have 2 matched samples of about 1000 records in each that I need to compare, but they are polar coordinates (magnitude and angle)....

    Started by EricaW‎, 06-19-2014 10:21 AM
    • Replies: 0
    • Views: 1,023
    06-19-2014, 10:21 AM Go to last post
  47. generating Space-time Poisson Process data

    Hello All I intend to generate some data that follows space-time Poisson process. any help or hint is appreciated!

    Started by Ferra‎, 06-18-2014 11:24 AM
    space-time poisson
    • Replies: 0
    • Views: 1,052
    06-18-2014, 11:24 AM Go to last post
  48. Help with linear regression model?

    I need to construct a linear regression model for the following information but i'm not entirely sure how to do it! S H L D Y 0 0 0 0 7.06 ...

    Started by jenniferrabbit‎, 06-18-2014 07:59 AM
    indicator, linear, model, multi, regression
    • Replies: 2
    • Views: 1,187
    06-18-2014, 09:51 AM Go to last post
  49. What stats test can you use- help please!

    I have 2 sets of data that I want to compare to see if they are statistically different from each other. The first set is the percentages of...

    Started by leagueteam‎, 06-17-2014 04:52 PM
    • Replies: 1
    • Views: 1,521
    06-18-2014, 07:19 AM Go to last post
  50. Best statistical approach?

    Hi all, I have a data set of an liquid chromatography/ mass spectrometry run. I ran four plant samples (two of one treatment, two of the other)....

    Started by robertson92‎, 06-17-2014 10:03 PM
    • Replies: 0
    • Views: 2,229
    06-17-2014, 10:03 PM Go to last post
  51. Operations between 2 data series with different sample size. What's the final n?

    Hi guys. As you may understand from the following question I am quite poor in statistic knowledge. That's my problem: I had to multiply 2...

    Started by Pierns‎, 06-17-2014 06:04 PM
    • Replies: 0
    • Views: 1,103
    06-17-2014, 06:04 PM Go to last post
  52. Explanation of answer

    If a travel agency offers special weekend trips to 12 different cities, by air, rail, bus, or sea, in how many different ways can such a trip be...

    Started by davidchung2004‎, 06-17-2014 05:43 PM
    • Replies: 1
    • Views: 1,430
    06-17-2014, 05:45 PM Go to last post
  53. Plausability of my Cumulative Abnormal Returns

    Dear all, I have a question regarding the plausability of my CAR(2;366)=-40%. My tutor (in accounting, not statistics) claims that it should lie...

    Started by Mboss‎, 06-17-2014 08:37 AM
    event study
    • Replies: 6
    • Views: 1,898
    06-17-2014, 12:01 PM Go to last post
  54. Repeated measurements analysis comparison between two groups

    Dear All, I am nearly illiterate in terms of statistics, and would like to get some advice from you. I have data on a RCT on a certain drug A ħ...

    Started by madeyedhl‎, 06-15-2014 09:28 PM
    repeated measurement
    • Replies: 3
    • Views: 1,617
    06-17-2014, 07:11 AM Go to last post
  55. Significance between pre/post along with different populations

    Hi All, I need to test for significant differences on the data in two time periods (pre-intervention and post-intervention) and with different...

    Started by nightxiao‎, 06-16-2014 03:39 PM
    • Replies: 1
    • Views: 1,101
    06-17-2014, 05:50 AM Go to last post
  56. Non-parametric method: confidence interval for the median (Wilcoxon)

    hello.I have a subject about Non-parametric method: confidence interval for the median (Wilcoxon) but i can't find any usefull information.i would...

    Started by alexandros‎, 06-17-2014 04:15 AM
    • Replies: 0
    • Views: 945
    06-17-2014, 04:15 AM Go to last post
  57. [SOLVED] Moving average: Smoothing until stable

    I am looking at a score in discourse over equally spaced intervals. Basically this is a time series. I want to view this as a line graph using the...

    Started by trinker‎, 06-16-2014 08:30 PM
    moving average
    • Replies: 7
    • Views: 3,905
    06-17-2014, 01:04 AM Go to last post
  58. Question about a Pearson's Correlation - r, p, sig

    this is the resulting table from a t-test... variable1 variable 2 variable 1 Pearson Correlation ...

    Started by vpmiller2009‎, 06-16-2014 10:47 PM
    pearson correlation, pearson r
    • Replies: 1
    • Views: 3,070
    06-16-2014, 11:33 PM Go to last post
  59. Normalizing a Skewed Distribution; using Excel and Carlberg book

    From the book Statistical Analysis, Microsoft Excel 2010 by Conrad Carlberg, page 23: In general, you can use Excel's SQRT() and LOG() functions...

    Started by robwinfield‎, 06-16-2014 09:20 AM
    excel, exp, log, normalize dataset, sqrt
    • Replies: 2
    • Views: 3,224
    06-16-2014, 01:55 PM Go to last post
  60. Predictive Model : Data Type

    Hi Stats Gurus, I am working on a model that predicts gestation period of new hires. By gestation period, i mean the period between they completed...

    Started by Riya‎, 06-16-2014 12:03 PM
    analytics, logistic regression, predictive model
    • Replies: 1
    • Views: 1,536
    06-16-2014, 01:41 PM Go to last post

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