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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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...

• Replies: 1
• Views: 196,581
07-16-2014, 11:01 AM
2. ### 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)...

• Replies: 0
• Views: 66,632
09-30-2005, 09:44 AM
1. ### p-values for groups for C=B/A when you have data on B (n=10-12) and A (n=6)

For 5 groups, i recently measured property A (n=6) and property B (n=10-12). Using Excel i obtained average, stdev and standard error for each...

• Replies: 1
• Views: 800
08-13-2014, 07:44 PM
2. ### Which model is better to use "Tobit" or "Probit and Truncated regression"

Dear all, I have data about household savings, savings can be positive or negative. I want to do two steps analysis. the first one is to see...

• Replies: 0
• Views: 1,214
08-13-2014, 09:57 AM
3. ### GLM, poisson distribution, R

Hi guys We've studied in total 60 groups of pigs (30 groups including male pigs, 30 groups of only females) for the occurrence of fighting...

• Replies: 2
• Views: 1,629
08-13-2014, 07:31 AM
4. ### Help with Probabilty

Hi, I came across a few confusion while doing my Home work, I just want to prove my answer, Here is the question 1.The probability that a person...

• Replies: 2
• Views: 2,128
08-12-2014, 06:14 PM
5. ### Post hoc test for Trend analysis and other

Hi all, I'm new to trend analysis and would like to get some advice. My study is about treatment intervention on learning. Between-subject...

• Replies: 0
• Views: 2,217
08-12-2014, 02:38 PM
6. ### How do you define a statistical way to ensure that the worst case are captured??

I need a recommendation which addresses the variability of results. There is variability associated with these results. What I specifically need...

• Replies: 8
• Views: 1,884
08-12-2014, 10:28 AM
7. ### Regression with Interaction term

Dear All I am estimating a random effect model where the main effect is not statistically significant. However, after including an interaction...

• Replies: 2
• Views: 2,160
08-12-2014, 02:21 AM
8. ### Adjusting means for different sample sizes

Hello, I have calculated the mean score for several variables. Because there is a big difference in the number of respondents for each variable it...

• Replies: 3
• Views: 1,664
08-11-2014, 03:49 PM
9. ### Differences in direction of association in univariate and multivariate analysis

Hi, I have a question regarding results from univariate and multivariate analysis. I have found a positive association between a dependent and...

• Replies: 2
• Views: 2,875
08-11-2014, 03:22 PM
10. ### Is ANOVA a possible test to apply to this data set?

Hello everybody! I am conducting a study which provided me a set of data correspondent to a set of substances, their concentration, and the final...

• Replies: 3
• Views: 1,283
08-11-2014, 08:06 AM
11. ### Regarding bivariate transformations and conditional distributions

The following is the question which I am not able to solve- Could any of you help me??:( Suppose the distribution of Y, conditional on X = x, is...

• Replies: 1
• Views: 1,505
08-11-2014, 05:26 AM
12. ### Stats- multiple comparison of continuous non parametric data

Dear Stats Talk I am hoping to obtain some advice based on a study I am trying to work on- Study overview We are measuring the performance of...

• Replies: 0
• Views: 1,383
08-10-2014, 04:50 PM
13. ### To pool or not to pool?

Hi there, Stuck with my current analysis, let me set the scene: I have 6 subjects, three are in "group A" and three are in "group B". From each...

• Replies: 8
• Views: 1,689
08-10-2014, 12:51 PM
14. ### help finding the proportion ?

• Replies: 13
• Views: 2,141
08-09-2014, 10:55 PM
15. ### Multiple factor ranking

Hi, Normally I guess the answer to this would be to z-score ((avg-mean)/stddev) the individual factors, then sum these and rank these. However...

• Replies: 1
• Views: 3,198
08-09-2014, 08:22 AM
16. ### Primer 6: Orientation plot

Hi, I'm struggling to find a way to display two types of data in the same MDS orientation plot in Primer 6; any advice on the following would be...

• Replies: 2
• Views: 2,078
08-09-2014, 03:17 AM
17. ### Urgent, help in statistics intepretation!

Hello, I am a French student in psychology and I am currently using spss to analyze my research project's results. I work on the perception of...

• Replies: 0
• Views: 909
08-09-2014, 01:57 AM
18. ### Choose a sample size

I'd like to choose a sample to represent a city of over 100000 people. A confidence coefficient of 0.98 is desired with the estimate, p, to be within...

• Replies: 1
• Views: 1,028
08-08-2014, 11:24 PM
19. ### Sum of squares for error (SSE)

I am reading a book called Applied Statistics with Excel by G. Keller. On p581 he wrote SSE = sum of (yi-ŷi)^2, where ŷ is obtained from the...

• Replies: 2
• Views: 1,577
08-08-2014, 06:49 PM
20. ### [SOLVED] I learned ANOVA,but what is AVOVA?

I was "into" statistics when I did my psych dissertation, but haven't had to use these methods since then (1990)! I'm helping a student with his...

• Replies: 3
• Views: 2,452
08-08-2014, 06:11 PM
21. ### How to determine weight used in weighted lottery?

This is a Real World problem. Lives are at stake. :eek: A friend recently applied to a professional training program in which admission was...

• Replies: 1
• Views: 1,637
BGM
08-08-2014, 05:07 PM
22. ### Mixed ANOVA's - adding third variable changes sign. of main and interaction effects.

Hi there, I ran an ANOVA using SPSS, with one within-subjects variable (1) and one between-subjects variable (2). Results indicated a significant...

• Replies: 4
• Views: 1,596
08-08-2014, 11:06 AM
23. ### Chi square and Z test for proportions for nominal data

I believe that to analyse 2 sets of nominal data chi square test is used ... can't we use Z test for proportions also to analyse 2 sets of nominal...

• Replies: 1
• Views: 2,337
08-07-2014, 10:41 PM
24. ### Statistical test to use

Hi all, I really need some help on deciding what stats test to use :) I have conducted an experiment looking the what effect wearing minimalist...

• Replies: 1
• Views: 1,150
08-07-2014, 11:16 AM
25. ### Arima modelling application

Good afternoon everyone. I'm currently looking at the best way to forecast activity levels using time series data. From this I need to provide a...

• Replies: 0
• Views: 1,020
08-07-2014, 11:10 AM
26. ### What kind of model yields: "If we DONT reach X by time t, chances go down by X?"

I currently have data telling me how many iPhone app downloads from the apple store applications were downloaded in a given time per app. I am...

• Replies: 1
• Views: 879
08-07-2014, 07:09 AM
27. ### Advice (Failure count stats)

Afternoon all, if you were presented with a dataset which contained failure counts for a piece of machinery split into months how would you go...

• Replies: 1
• Views: 1,879
08-07-2014, 03:39 AM
28. ### correlation coefficient between 2 autocorrelated time series

Hi I have 2 time series each 19 data points long which have a correlation coefficient of 0.5. Great! Problem. The time series are both display a...

• Replies: 0
• Views: 1,019
08-06-2014, 09:36 AM
29. ### Ratio of two variables both with F distribution

If X~F(a,b) and Y~F(a,b) what is the distribution of X/Y? Ideally I would also like to know the answer if X~F(a,b) and Y~F(c,d). Thanks

• Replies: 1
• Views: 960
BGM
08-06-2014, 06:53 AM
30. ### Standard Error--Question

I've been given a dataset that contains an estimated value of survival (Kaplan-Meier with staggered entry) by calendar dates and the associated...

• Replies: 0
• Views: 1,199
08-06-2014, 06:08 AM
31. ### Correlation coefficients in subsample and whole sample

Hi, I know that this might sound to be an easy and basic statistic concept, but I'm really beginner in this field. This is the thing. I have two...

• Replies: 8
• Views: 3,739
08-05-2014, 08:53 PM
32. ### Species diversity index without count data

Hello I want to calculate plant species diversity (Shannon wiener index) for some land parcels that I have sampled but I dont have counts of...

• Replies: 0
• Views: 1,124
08-05-2014, 01:59 PM
33. ### ANOVA with repeated measurement: multivariate tests; MANOVA for repeated measures

Hello everyone I need help with my analysis of variance with repeated measurement. I did a study where I measured 6 values of every participant...

• Replies: 0
• Views: 938
08-05-2014, 07:56 AM
34. ### Which Statistical method to be used for the below problem?

I want to know which statistical method to use for the below problem. Suppose I have the revenue data of 5 companies in the same industry. And, also...

• Replies: 0
• Views: 919
08-05-2014, 06:16 AM
35. ### How can confirm the data in the table is statistically significant?

Hi, Please find the table document. https://www.dropbox.com/s/s22obnlizefeejj/stat%20check.xlsx Numbers in bracket refers to number incidents...

• Replies: 0
• Views: 1,516
08-05-2014, 03:06 AM
36. ### How can I model a "multiplier effect" in time series data?

I currently have data corresponding to how often a certain set of songs were downloaded. Each song has a release date, and then the number of...

• Replies: 0
• Views: 945
08-05-2014, 12:21 AM
37. ### Interrater reliability using a selection of the sample

I have 100 newspaper articles that I am coding qualitatively. I am working on this project independently but another researcher is helping me develop...

• Replies: 1
• Views: 932
08-04-2014, 03:42 PM
38. ### Excel Analysis

I found this question to be worded ambiguously. Have I met all the requirements the problem has stated?

• Replies: 0
• Views: 1,325
08-04-2014, 01:37 PM
39. ### Ratio of ratio of variances

If X1, Y1, X2 and Y2 are all Normally distrubted variables then I can calulate the variance of each set. I then want to test whether the ratio...

• Replies: 0
• Views: 813
08-04-2014, 08:47 AM
40. ### proportion inference analysis

Hi. I have data on 1027 potential donors to a non-profit organization. I want to see if our online ads have impacted their donation rates. The...

• Replies: 1
• Views: 1,264
08-04-2014, 04:21 AM
41. ### No mean and standard deviation for confidence interval.

According to the government, 23% of all American adults have more than one job. A random survey of 68 adults finds that 21 of them hold more than one...

• Replies: 2
• Views: 1,210
08-03-2014, 06:47 PM
42. ### Dependent proportions: McNemar test although one cell is inevitably zero?

Hi everyone, I would like to compare dependent proportions. The aim is to find out whether the proportion of people who commit an error in test B...

• Replies: 7
• Views: 3,076
08-03-2014, 02:14 PM
43. ### Multiple regression: what if beta > 1.OO

Hello everybody, I made a multiple regression with 6 IV and one DV. But the only significant IV has a beta = 1,004. Beta doesn't have to be <...

• Replies: 2
• Views: 1,559
08-03-2014, 10:53 AM
44. ### How to get from Confidence Interval to Percent Confidence Interval?

Thank you for your time with this... This is in relation to a stratified random sample. I have the confidence interval expressed as a range of...

• Replies: 0
• Views: 1,202
08-02-2014, 02:11 PM
45. ### Simple (hopefully) t-test with averaged data question

Hello, I have what I hope is a simple question, though I'm struggling to find the answer. BACKGROUND: I have a small dataset with 20 subjects...

• Replies: 0
• Views: 812
08-02-2014, 01:35 PM
46. ### post hoc power anlaysis for a regression model

Hi everyone, I was hoping you could help me a little by answering a few questions that came up while I was trying to calculate post hoc power...

• Replies: 0
• Views: 1,765
08-02-2014, 12:46 PM
47. ### Is this correct?

Hi, I have 2 questions I'm not sure of. 1.) According to a 1997 study, 29.3% of self- employed persons worked on their home based businesses 35...

• Replies: 1
• Views: 3,422
08-01-2014, 09:15 AM
48. ### Rolling Dices

here is how the problem goes: Charlie and Dave are betting over a sequence of rolls of a single die. Charlie will win the first time consecutive...

• Replies: 1
• Views: 2,725
08-01-2014, 09:10 AM
49. ### A few questions

Hi just wondering if anyone could just make sure I'm doing this right. Can you also help on the last question especially. Thanks 1) Z~N(0,1) and...

• Replies: 1
• Views: 2,402
08-01-2014, 09:01 AM
50. ### Comparing two test conditions two different ways -- what is the logical difference?

Consider this: Test 1: Heat treat and check hardness of 8 samples at two different heat treat oven settings (for simplicity, let's call them HOT...

• Replies: 5
• Views: 2,103
08-01-2014, 07:51 AM
51. ### lmPerm - has it been removed?

I can't seem to find this package - "lmPerm" (linear model permutation test). On the page http://cran.r-project.org/web/packages/lmPerm/index.html...

• Replies: 0
• Views: 3,088
08-01-2014, 06:41 AM
52. ### Problematic variables in regression model

I'm using data from from a publicly available Europe-wide survey of employees which was conducted over a series of waves from 1991-2010. The survey...

• Replies: 0
• Views: 1,368
08-01-2014, 05:00 AM

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