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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: 197,244
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: 67,011
09-30-2005, 09:44 AM
1. ### Confused about Correlation Terms

Hi, I am confused about different correlation terms. Can you help me? Difference between Cross correlation, Serial Correlation and Seasonality...

• Replies: 0
• Views: 902
12-23-2012, 11:48 PM
2. ### Which potential predictors to add to the logistic regression model?

I am assessing the effects of some covariables and categorcial variables (exactly 5 independent variables) on a binary outcome. When I enter the...

• Replies: 4
• Views: 3,219
12-23-2012, 01:48 AM
3. ### How to compare two regression lines?

Hi, I'm trying to find out if Pearson and Spearman correlations are equally suited for my data. I've computed some Pearson and Spearman correlations...

• Replies: 0
• Views: 2,193
5''
12-22-2012, 05:20 PM
4. ### How do I fit a glmer with poisson distributed count data in R?

Hello everybody, I just recently started exploring R and mixed models in order to analyze the data for my master thesis. However, my data is not...

• Replies: 3
• Views: 3,221
12-22-2012, 12:50 PM
5. ### type of statistical test to use

Hi everyone, I'm a beginner in statistics and SPSS. I have a hypothesis, an independent variable about the number of years of work experience...

• Replies: 4
• Views: 2,762
12-21-2012, 05:10 PM
6. ### t-test to be used if values are not the mean??

Dear all, I would be very grateful for any advice. I would like to calculate if 2 statistical results are significantly different from one...

• Replies: 2
• Views: 1,213
12-21-2012, 11:34 AM
7. ### tough one !

Hello guys , actually I got this problem as a bonus question to be delivered ASAP , I busted my ass trying to even start with it but I couldn't ! ...

• Replies: 0
• Views: 880
12-21-2012, 11:29 AM
8. ### ANOVA? how?

hi all, this is fairly elementary, though would appreciate any help: suppose I have 3 store locations that carry identical number of product types...

• Replies: 3
• Views: 1,392
12-20-2012, 06:24 PM

For the following variables, determine whether it is measured on Interval or Ratio Scales, Explain. X: attendance at last night's concert X: cost...

• Replies: 0
• Views: 1,124
12-20-2012, 01:59 PM
10. ### How to report dummy variables (logistic regression, SPSS)

I am trying to write up a logistic regression analysis into a table, but am confused with what to report. I have a categorical variable which has 3...

• Replies: 0
• Views: 2,848
12-20-2012, 01:52 PM
11. ### taking mean of two groups, how to get SE (not pooled!)

Dear All, First the short question: Given only condition means and SEs in a repeated measures design, how do I compute the SE when collapsing...

• Replies: 4
• Views: 1,690
12-20-2012, 10:32 AM
12. ### Question for those already in work using statistical models

I am a newb to stats and am wondering how in the workplace statistical models come about and take shape. This is what I envisage but no doubt it...

• Replies: 1
• Views: 1,013
12-19-2012, 07:19 PM
13. ### Binary logistic regression independent variables, help please asap

Hi, I am writing a short paper on voter turnout. I would like to use bianary logistic regression for this purpouse. I have one problem, my household...

• Replies: 2
• Views: 1,831
12-19-2012, 06:14 AM
14. ### Help understanding Q Q plot....

I'm trying to understand elements of a Q Q plot and am struggling with the following.... So I understand if the quantiles of my sample match up...

• Replies: 1
• Views: 4,758
12-19-2012, 12:53 AM
15. ### Dealing with multicollinearity by separating common variance

• Replies: 0
• Views: 1,111
12-18-2012, 04:48 PM
16. ### Statistiical Measure of Mean AND Dispersion

• Replies: 2
• Views: 1,044
12-18-2012, 03:55 PM
17. ### Normal distrubtion (Find standard deviation)

Random variable X is normally distributed. Mean = β , standard deviation = h given that the difference of 68th percentile and 36th percentile is...

• Replies: 4
• Views: 1,728
12-18-2012, 11:38 AM
18. ### Cox's Regression help

Hello, I'm looking at survival in mice with 10 different knockouts. I've exposed these knockouts to 6 different diets and am looking to do a...

• Replies: 5
• Views: 2,149
12-18-2012, 09:14 AM
19. ### 15 Likert scale questions: How do I find the mean, median and mode?

Please Help! I need to find the mean the median and the mode and also use a t test to interpret my results between females and males in mate...

• Replies: 11
• Views: 14,499
12-18-2012, 03:03 AM
20. ### How do I input data from a survey onto SPSS?

Title: Gender Differences in Mate Selection How do I input data from my survey onto SPSS? For example one of my questions is: How important do...

• Replies: 0
• Views: 1,859
12-17-2012, 07:47 PM
21. ### Likert items-->Likert scale-->analysis

I'm working on a research project trying to identify motivation types and self-identity changes of the participants. Then I have to do group...

• Replies: 7
• Views: 1,788
12-17-2012, 06:25 PM
22. ### (SPSS logistic regression) Variable effect in wrong direction

I am running a logistic regression with 7 IVs, N= 214. The model is significant and the R2 is .45. However, the individual variables show some odd...

• Replies: 2
• Views: 2,206
12-17-2012, 12:19 PM

I'm having trouble with a few questions in my text book and was hoping you could help...I need to know this for my exam and I just need some help...

• Replies: 0
• Views: 3,689
12-17-2012, 02:50 AM
24. ### residuals for Beta's as shown hw

I need to interpret a residual table which was fitted by y_.0123 (final residual) against the x_1.023. The table represents residuals produced by...

• Replies: 0
• Views: 1,511
12-16-2012, 06:04 PM
25. ### Control Variate Monte Carlo

Consider the function f(x)=e^{-x^2} . Using successfully higher order Taylor expansion , find two appropriate control functions. Then assuming ...

• Replies: 3
• Views: 3,248
BGM
12-16-2012, 03:23 PM
26. ### statictics problem.

the transform T ' = f(T) of a sufficient statistic T by a function f(.) is usually not sufficient : only when f(.) is one-to-one is f(T) always...

• Replies: 1
• Views: 1,359
12-16-2012, 12:46 PM
27. ### can someone solve this ?

• Replies: 4
• Views: 1,860
12-16-2012, 04:16 AM

Hey, I have one question about the p-value. So for example, the test statistics of something will be 1.7821. So to find the p-value we use z-score. ...

• Replies: 2
• Views: 1,350
12-15-2012, 09:07 AM
29. ### Binomial Distribution Cumulative Probability Table

Ok so, the table starts from n=5 and ends at n = 25. Some questions I have are binomial questions that are for example X ~ (30, 0.5) <= is more...

• Replies: 2
• Views: 2,081
12-15-2012, 09:04 AM
30. ### 4 continuous IVs predicting a single binary DV

Like the title says... I have 4 continuous IVs, whose combined effects (i.e. interactions possible) should predict a binary DV (possible values 1...

• Replies: 9
• Views: 2,026
12-14-2012, 07:44 PM
31. ### Test whether the SD of multiple normal distributions differs between two genes

Hi, I am comparing data on gene expression between two different genes that have been tagged with GFP. Gene expression is measured using flow...

• Replies: 0
• Views: 1,155
12-14-2012, 03:13 PM
32. ### Least Median of Squares

Hello everyone, I have difficulty on when I try to estimate the regression coefficient (beta) in multiple linear regression through least median of...

• Replies: 1
• Views: 2,259
12-14-2012, 11:53 AM
33. ### Expected value of absolute value

• Replies: 6
• Views: 4,610
12-14-2012, 11:50 AM
34. ### Independent Sample T Test - Levene's Test for Equality of Variances

Hi everyone! I am currently doing a dissertation for my undergraduate studies. I am currently stuck with a question about Levene's Test for Equality...

• Replies: 5
• Views: 7,768
12-13-2012, 09:48 PM
35. ### Goodness-of-fit of model derived from multivariate logistic regression

I have a question regarding the relationship between the value of Chi square and df in determining the goodness-of-fit in a model derived from...

• Replies: 0
• Views: 1,069
12-13-2012, 07:24 PM
36. ### ANCOVA - testing interactions with multiple covariates

Hello, I have a question concerning ANCOVA and was hoping one of you could help me out :). I tried looking all over the internet and of course in...

• Replies: 4
• Views: 6,269
12-13-2012, 05:20 PM
37. ### Determine store close schedule

• Replies: 1
• Views: 1,131
12-13-2012, 04:17 PM
38. ### The MLE and sufficient statistic problem.

• Replies: 3
• Views: 2,192
12-13-2012, 03:01 PM
39. ### Showing Beta is from Exponential family

I'm trying to do the proof for beta to exponential family proof. here is what I did Can somebody check it and tell me if it's good? ...

• Replies: 4
• Views: 2,578
12-13-2012, 01:36 PM
40. ### Covariance of two functions for error propagation

Hi all, I have two functions: X=A-B Y=A+2B I need to calculate the covariance of X and Y in terms of the (known) variances of A and B as...

• Replies: 2
• Views: 3,312
12-13-2012, 11:03 AM

Hi all, I'm having a really rough time with some work I'm doing and the more I look at it the less any of it seems to makes sense! The...

• Replies: 0
• Views: 1,043
12-13-2012, 08:58 AM
42. ### T-test help needed

Hey there, I have data I collected from a CEGE test of two game prototypes my group and I developed for a course. There were two respondents, who...

• Replies: 3
• Views: 2,231
12-13-2012, 08:52 AM
43. ### Non normality in residuals in SLR

Hey guys. I've done a SLR and after testing the residuals for normality using the Shapiro-Wilk test and I've learned that the residuals are not...

• Replies: 7
• Views: 2,330
12-13-2012, 03:26 AM
44. ### What analysis to use?

Hi, I am helping a friend complete an analysis of some data. The experiment takes two groups -those with formal training in sound engineering...

• Replies: 1
• Views: 1,443
12-12-2012, 11:38 PM
45. ### Binomial Distribution Significance Level

Let X have a Binomial distribution with the number of trials n=15 and with probability of "success" p. We wish to test Ho: p=0.30 vs. H1: p doesn't...

• Replies: 1
• Views: 2,166
BGM
12-12-2012, 11:28 PM
46. ### Finding point estimate for true average, median, variance, and standard deviation.

I am given the data of-- 2.22, 1.96, 0.92, 1.77, 2.08, 1.60, 1.46, 1.73. I have a TI-84 Silver Plus Edition and I would like to know how to use it...

• Replies: 0
• Views: 4,829
12-12-2012, 07:28 PM
47. ### BIBD in SPSS?

Could someone please point me to a good online resource for how to analyze and interpret a balanced incomplete block design using SPSS? Also, there...

• Replies: 0
• Views: 4,900
12-12-2012, 03:13 PM
48. ### least squares homework

I need help with this question and how to proceed need to rewrite the following regression fitting, can someone assist with this problem. I don't...

• Replies: 3
• Views: 1,634
12-12-2012, 02:31 PM
49. ### what does it mean by criterion and power?

The latest in the “You may be a redneck if . . . ” genre has produced a simple questionnaire. If more than 80% of the questions are answered in...

• Replies: 1
• Views: 1,146
12-12-2012, 02:22 PM
50. ### t test question

In your summer job at the Lucerne plant, you are in charge of the machine that packages frozen peas. It is supposed to package 1.0 kg of peas in a...

• Replies: 3
• Views: 1,249
12-12-2012, 01:42 PM
51. ### question relatedto type 1, type 2 errors.

let me see give me a sec

• Replies: 1
• Views: 1,768
12-12-2012, 04:34 AM
52. ### Comparing kappa coefficients

I have a simple R script which uses the psych package to calculate cohens kappa (weighted) from a csv file. The csv file has 2 columns of ordinal...

• Replies: 0
• Views: 1,209
12-12-2012, 04:03 AM
53. ### Amchem's Tax Credit case study - stuck in a rut

Hello everyone, and first of all thank you for taking the time to read this. I am a student in a Management postgraduate program and during our...

• Replies: 1
• Views: 3,347
12-12-2012, 03:34 AM
54. ### Binomial Distribution Hypothesis Testing

Let X have a Binomial distribution with the number of trials n = 15 and with probability of “success” p. We wish to test H_0 : p = 0.30 vs. H_1 : p ≠...

• Replies: 2
• Views: 2,573
12-11-2012, 10:19 PM
55. ### Likert scale analysis

Hi. I have carried out a staff survey with about 30 questions grouped into a number of variables eg staff engagement, communication. I have done a...

• Replies: 8
• Views: 1,726
crm
12-11-2012, 05:51 PM

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