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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: 196,855
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: 66,810
09-30-2005, 09:44 AM
1. ### Survey Findings How to Use - help

I have a dataset of items which use items from the GSS. My sample (N=300) was randomly drawn from 2000 respondents. They are a special population of...

• Replies: 0
• Views: 1,099
06-08-2013, 02:38 PM
2. ### auto-regressive and polynomial models

Hi, I am not a statistician and I want to use the pure auto-regressive (AR) model and/or the polynomial model to solve a prediction problem. I...

• Replies: 0
• Views: 779
06-08-2013, 08:41 AM
3. ### Finding P-value...confusing

The target length for a component is set at 30mm. A random sample of 25 components is selected and the lengths of each are recorded. The result is...

• Replies: 1
• Views: 997
06-08-2013, 08:10 AM
4. ### Standard error calculation fails

Hello all. I would really appreciate any help in solving this problem: There is an interesting article on funnel plots on the web:...

• Replies: 0
• Views: 1,528
06-07-2013, 05:28 AM
5. ### -->(BOX-COX) Transformation breaks down for large (positive) coefficient values <--

Hi, I have done a box-cox transformation of my response variable, using the following formula: (Y^lambda - 1)/lambda Previously, I have got some...

• Replies: 0
• Views: 1,392
06-07-2013, 04:05 AM
6. ### Relationships between quantitative and categorical variables

Hello I need your help to find a methodology to analyze some data that I have collected for my research. I will explain how I collected my...

• Replies: 0
• Views: 1,218
06-07-2013, 03:08 AM
7. ### Broken Line Regression

X = Lot & Y = Cost Give a broken line linear model with a breakpoint at 250: Y = B0 + B1X1 + B2X2 + B3X3 + e where X2 = 0 or 1 depending on...

• Replies: 2
• Views: 1,969
06-06-2013, 10:30 PM
8. ### Problem with estimate.

Hello, I have practiced on an exam problem, and in the problem they chose to estimate a paramter a way that I did not like. We have to joint...

• Replies: 0
• Views: 799
06-06-2013, 06:02 PM
9. ### Question about One-Way Anova assignment

ANOVA Sum of Squares df Mean Square F Sig. A Between Groups 1.140 2 .570 .262 .770 Within...

• Replies: 3
• Views: 1,359
06-06-2013, 11:14 AM
10. ### building confidence interval for a simulated estimate

Hi, the context : I'm using a basic logistic regression model on my data, and the values of interest are the basic estimates : Beta regression...

• Replies: 20
• Views: 3,923
06-06-2013, 10:46 AM
11. ### confidence interval for mean difference vs. hypothesis testing

Hello, I am trying to solve a simple question in hypothesis testing and confidence interval, and something doesn't seem right. I have an...

• Replies: 6
• Views: 2,198
06-06-2013, 09:32 AM
12. ### Basic question about variance

Hi! First time poster, hello all! My question is as follows: a symmetrical dice is tossed ten times. What is the expected value and variance? ...

• Replies: 4
• Views: 1,653
06-06-2013, 08:21 AM
13. ### Calculating a sample size and upper and lower confidence intervals

Good evening, My goal is to develop a testing strategy for the shell strength of eggs for retail sale in egg cartons. Currently we use a grading...

• Replies: 0
• Views: 2,313
06-06-2013, 06:28 AM
14. ### 2 way anova

Dear SPSS thinkers, I have a case with one dependent variable ( image of a product) and two independent variables, gender and age. My problem lies...

• Replies: 0
• Views: 1,336
06-06-2013, 05:01 AM
15. ### Question

Hello everyone. I am working on the following problem for my stat class: Assume that when victims are asked how well their needs were met by the...

• Replies: 0
• Views: 1,469
06-05-2013, 09:39 PM
16. ### Random sampling - field research in Bihar, India

Dear all, I am currently doing some research in India for my studies and have question relating to sampling? I need to interview people in those...

• Replies: 0
• Views: 1,197
06-05-2013, 07:48 PM
17. ### Meshing research questions and stats for descriptive research

Hi, I'm doing research on students' views on the nature of science. I'm using a descriptive research design. I am comparing students views based on...

• Replies: 0
• Views: 1,130
06-05-2013, 06:09 PM
18. ### pre n post, longitudinal

Hello! We are going to measure (interval scale) levels of skills and knowledge before, under, and after an educational/pedagogical project....

• Replies: 1
• Views: 926
06-05-2013, 03:28 PM
19. ### Correlation not reflecting actual similarity of values

Hello, I have 2 vector of data which correspond to rating in a test. Subjects perform the test and rate their result (from 0 to 10) and the next...

• Replies: 3
• Views: 1,431
06-05-2013, 11:17 AM
20. ### Analyzing Differenced Data

Hello, I have a lake and we're looking at the changes each year in the amount of liquid in the lake (so freezing, melting, etc). I am performing...

• Replies: 0
• Views: 834
06-05-2013, 09:43 AM
21. ### Crises: ANOVA? How to analyse non-normal, non-Homogeneity data with different N group

Dear all, I'm somewhat new the world of statistics, or at least it has been years since I last used it and basically the only program I know...

• Replies: 0
• Views: 1,268
06-05-2013, 03:57 AM
22. ### Need help choosing an appropriate test.

I have two sets of frequencies, observed and expected. I know I could do a Chi-squared test to determine if the frequency distributions match, but...

• Replies: 3
• Views: 1,067
06-04-2013, 05:20 PM
23. ### Quasi-experimental design ignorance

Hi guys. I'm an idiot. Please help me. :-( I want to compare success rates of different interventions on two variables in multiple non-random...

• Replies: 7
• Views: 1,947
06-04-2013, 11:18 AM
24. ### Anova? Manova? multiple T-tests? (newbie question warning)

Hello all I have study data to analyze, and my normal stats guru is out of town. The study (some facts altered to protect the innocent) goes...

• Replies: 2
• Views: 1,652
06-04-2013, 04:49 AM
25. ### Percentages - simple question

Hello I got confused and need help with a primary school problem... If I have a measurement of some variable, for example 25, and then I take...

• Replies: 1
• Views: 1,208
BGM
06-04-2013, 04:18 AM
26. ### Is a Cox regression the right test for my question?

I would like to test if the value of a blood parameter is linked to death (age as a covariate)....example: higher serum creatinine = higher risk to...

• Replies: 0
• Views: 1,255
06-03-2013, 04:32 PM
27. ### Normally distributed RVs

Hello. I'd like to know how can I calculate the probability that normally distributed random variables locate on the surface area on a cylinder? I...

• Replies: 7
• Views: 1,393
BGM
06-03-2013, 01:04 PM
28. ### Weibull Distribution Problem Help (Theoretical and Matlab)

Consider a Weibull distribution with the following pdf: f(x)= (Ɵ2/ Ɵ1)*(x/ Ɵ1)^( Ɵ2-1)*exp{-( x/ Ɵ1)^ Ɵ2} For x>0, Ɵ1>0, Ɵ2>0 (a) if now Y=( x/...

• Replies: 5
• Views: 4,883
06-03-2013, 05:00 AM
29. ### Determining the sampling distribution

I have been presented with the following question:

• Replies: 0
• Views: 1,405
06-02-2013, 07:15 PM
30. ### Unpaired, dependent data comparison, or comparison of paired means

Hi I'm trying to find a statistical test that can help me compare the means of two dependent groups. My data: 1: parameter values from white...

• Replies: 1
• Views: 2,782
06-02-2013, 06:33 PM
31. ### importing csv files into R

Hi I keep trying to import a csv file into R but keep getting the error "ÿþS", please can anyone tell me what I am doing wrong

• Replies: 14
• Views: 12,386
06-02-2013, 05:16 PM
32. ### Looking For A Name For This Process

Hi there. Is there a name for the statistic function of taking a group of numbers -> removing the highest and lowest -> then selecting the number...

• Replies: 4
• Views: 1,286
06-01-2013, 10:22 PM
33. ### Recommended strategy when related data sets have different properties?

I have 4 pairs of data sets; each data set consists of 10 values (so, 20 values per pair), and I need to compare each pair of value sets against each...

• Replies: 4
• Views: 1,322
06-01-2013, 05:30 PM
34. ### Calculating averages of SD values. Why is it wrong?

Why can't SD be averaged? I have calculated the SD of a continuous variable within a group of people, as a measure of variability for that variable....

• Replies: 4
• Views: 1,426
06-01-2013, 04:34 PM
35. ### Two-way ANOVA to detect difference in activity at different temperatures?

I need to answer the question of whether three species differ in their activity pattern according to soil temperature. Activity pattern is measured...

• Replies: 0
• Views: 1,164
06-01-2013, 02:44 PM
36. ### Conditional Variance and Expectation in a Binomail Mixture Model

This is a homework question. Any hints would be much appreciated. The question asks what the estimates of E(Y) and Var(Y) are based on the...

• Replies: 2
• Views: 878
06-01-2013, 08:35 AM
37. ### Loco-regional recurrence free survival longer than overall survival...

If the loco-regional recurrence free survival is longer than the overall survival, is it right to interpret as most patients died from distant...

• Replies: 0
• Views: 1,255
05-31-2013, 06:37 AM
38. ### Calculating margin of error

Hi, I carried out a survey of a small population (70 people) and obtained 36 completed questionnaires, representing a response rate of just over...

• Replies: 2
• Views: 780
05-30-2013, 10:56 AM
39. ### Family Wise Error, Help determining family size...

Hello, I am currently performing odds ratios (with chi squares) on the following table: Eyes Ears Nasal Oral Respiratory Trauma Gender Age...

• Replies: 3
• Views: 1,938
05-30-2013, 09:58 AM
40. ### Question for Stratify sampling

I am trying to understand the sampling from the following description. Does anyone know how they get the sample stratum sizes: 10,5,10,4,6. Thanks a...

• Replies: 0
• Views: 1,098
05-30-2013, 08:27 AM
41. ### The best methodology for an employee survey?

Hi, I'm looking at an Employee Engagement Survey... - The survey has a total of 49 questions in it. - All responses are on a 5 point likert...

• Replies: 2
• Views: 1,558
05-30-2013, 07:24 AM
42. ### Out-of-bound corrected correlation. What should we do?

When you get correlations corrected for artifacts (e.g., unreliability or more broadly, such as those listed in that online book) higher than 1. What...

• Replies: 0
• Views: 1,127
05-30-2013, 12:22 AM
43. ### Calculating my percentile score - it just seems too high!

I recently completed an exam and received my scores. I wanted to find out my percentile. I got a total of 317.5 out of a total score of 500. I...

• Replies: 14
• Views: 1,983
05-29-2013, 01:39 PM
44. ### Apparent contradiction in Mann-Whitney-Wilcoxon test results

I have 2 data sets, each N=10, that I would like to compare. They fail Levene's test for homogeneity of variances, and for this reason, I can't use...

• Replies: 5
• Views: 1,605
05-29-2013, 11:01 AM
45. ### Variance of combined and weighted data sets

Hello all! The basics of my problem are as follows. I survey 1000 non-hispanics and 1000 hispanics and ask them whether they bought a power drill...

• Replies: 0
• Views: 2,039
05-29-2013, 09:11 AM
46. ### Problem calculating element-wise percent change

I have 2 data sets that I'm attempting to compare to each other, using a percent change calculation. I have data collected for a physiological model...

• Replies: 0
• Views: 1,770
05-28-2013, 07:48 PM
47. ### chi square test for binary valued data

Hi all, I am trying to implement an algorithm using a programming environment. What I am asking is how can use chi square test for binary type...

• Replies: 12
• Views: 4,830
05-28-2013, 05:49 PM
48. ### Stepwise Multiple Regression - Case:IV Ratio?

Hi, Having researched stepwise regression there is a clear view that you need to target a Case:IV Ratio of at least 40:1 as "stepwise doesn't...

• Replies: 4
• Views: 1,707
05-28-2013, 02:55 PM
49. ### gamma-function

gamma-function g(t) = ymax * t^(alpha) * exp( alpha * (1-t)) With known ymax and alpha, what is the maximum slope of g(t) (with t>0)?

• Replies: 23
• Views: 4,190
05-28-2013, 02:20 PM
50. ### Compare std deviation to know which dataset has more data points closer to mean?

Hi I have two datasets each with different mean and standard deviation (std). We know that, std is a measure of the dispersion of the numbers from...

• Replies: 2
• Views: 1,240
05-28-2013, 11:41 AM
51. ### model comparison, log likelihood score, P value.

I am working on Bioinformatic analysis of genomic data. I am doing some statistical analysis and doing model comparison and have some conceptual...

• Replies: 3
• Views: 3,446
BGM
05-28-2013, 08:10 AM
52. ### Grouping multiple survey question to obtain 1 Mean & Std. Dev.

Hi, I am currently doing an academic research and I would like some advice on the following issue. The research is about age & gender...

• Replies: 0
• Views: 1,517
05-28-2013, 08:08 AM
53. ### interpreting and commenting on Repeated-Measures ANOVA results

Hello, everybody, you've always been really helpful, so I've got a question to you, again :) I am dealing with an assignment, where we have to...

• Replies: 0
• Views: 1,240
05-28-2013, 06:43 AM
54. ### What Test to Use to Compare Groups

I'm looking through some data that I have collected from my patients over the past year and wanted to know what Statistical Test to use to see if a...

• Replies: 10
• Views: 1,688
05-28-2013, 03:35 AM
55. ### Stats homework Help

Hey Guys I kind of need help with these questions:) would really appreciate it:) 1.)When the assumption of sphericity is violated, correction...

• Replies: 2
• Views: 1,733
05-28-2013, 02:37 AM

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