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

• Replies: 1
• Views: 2,073
08-10-2013, 07:48 PM
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...

• Replies: 10
• Views: 2,765
08-10-2013, 03:36 PM
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"...

• Replies: 0
• Views: 2,498
08-09-2013, 04:33 PM
4. Comparring Means with Different Variances

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

• Replies: 3
• Views: 1,284
08-09-2013, 09:11 AM
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...

• Replies: 0
• Views: 1,603
08-09-2013, 06:47 AM
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:...

• Replies: 1
• Views: 1,057
08-08-2013, 08:21 PM
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,...

• Replies: 0
• Views: 2,795
08-08-2013, 07:41 PM
8. 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....

• Replies: 1
• Views: 869
08-08-2013, 09:31 AM
9. 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...

• Replies: 0
• Views: 848
08-08-2013, 09:25 AM
10. 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...

• Replies: 1
• Views: 1,267
08-08-2013, 07:58 AM
11. 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...

• Replies: 3
• Views: 1,522
BGM
08-07-2013, 06:43 AM
12. 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...

• Replies: 1
• Views: 1,193
BGM
08-07-2013, 06:40 AM
13. 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...

• Replies: 3
• Views: 1,425
08-07-2013, 02:45 AM
14. 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...

• Replies: 2
• Views: 1,357
08-06-2013, 11:37 AM
15. 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...

• Replies: 0
• Views: 1,738
08-06-2013, 09:27 AM
16. 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...

• Replies: 0
• Views: 1,062
08-06-2013, 01:06 AM
17. 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...

• Replies: 11
• Views: 3,575
08-05-2013, 11:15 AM
18. 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...

• Replies: 0
• Views: 1,057
08-05-2013, 10:17 AM
19. 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...

• Replies: 1
• Views: 1,305
08-05-2013, 10:16 AM
20. 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...

• Replies: 1
• Views: 1,132
08-05-2013, 09:53 AM
21. 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...

• Replies: 0
• Views: 1,631
08-04-2013, 11:56 PM
22. 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...

• Replies: 0
• Views: 1,097
08-04-2013, 09:42 PM
23. 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...

• Replies: 2
• Views: 2,200
08-04-2013, 08:02 PM
24. 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...

• Replies: 0
• Views: 1,273
08-04-2013, 05:43 PM
25. 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 -...

• Replies: 1
• Views: 8,177
08-04-2013, 11:33 AM
26. 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...

• Replies: 0
• Views: 1,129
JTA
08-02-2013, 03:28 PM
27. 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...

• Replies: 3
• Views: 1,229
08-02-2013, 01:56 PM
28. 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...

• Replies: 1
• Views: 927
08-02-2013, 10:09 AM
29. 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 -...

• Replies: 1
• Views: 2,386
08-02-2013, 09:31 AM
30. 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...

• Replies: 8
• Views: 2,832
08-02-2013, 06:08 AM
31. 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...

• Replies: 0
• Views: 1,237
08-01-2013, 06:56 PM
32. 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...

• Replies: 2
• Views: 1,581
08-01-2013, 11:08 AM
33. 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...

• Replies: 0
• Views: 1,511
07-31-2013, 01:41 PM
34. 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...

• Replies: 3
• Views: 1,518
07-31-2013, 07:12 AM
35. 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. ...

• Replies: 0
• Views: 1,123
07-31-2013, 05:16 AM
36. 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...

• Replies: 4
• Views: 1,005
07-31-2013, 03:03 AM
37. 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...

• Replies: 6
• Views: 1,430
07-31-2013, 02:13 AM
38. 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...

• Replies: 4
• Views: 1,826
07-30-2013, 10:49 PM
39. 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...

• Replies: 0
• Views: 1,118
07-30-2013, 06:45 PM
40. 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...

• Replies: 0
• Views: 1,348
07-30-2013, 03:39 PM

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...

• Replies: 12
• Views: 4,448
07-30-2013, 01:26 PM
42. 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...

• Replies: 2
• Views: 1,957
07-30-2013, 08:48 AM
43. 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...

• Replies: 2
• Views: 1,751
07-30-2013, 07:29 AM
44. 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...

• Replies: 0
• Views: 4,014
07-30-2013, 04:42 AM
45. 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...

• Replies: 4
• Views: 2,191
07-30-2013, 03:47 AM
46. 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...

• Replies: 0
• Views: 2,599
07-30-2013, 02:31 AM
47. 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 ...

• Replies: 1
• Views: 1,502
07-29-2013, 03:29 PM
48. 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...

• Replies: 3
• Views: 1,476
07-29-2013, 01:57 PM
49. 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...

• Replies: 2
• Views: 2,629
07-29-2013, 12:17 PM
50. 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...

• Replies: 4
• Views: 2,113
07-29-2013, 11:52 AM
51. 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...

• Replies: 0
• Views: 1,333
07-29-2013, 11:29 AM
52. 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...

• Replies: 2
• Views: 2,354
07-29-2013, 05:36 AM
53. 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...

• Replies: 1
• Views: 2,038
07-29-2013, 05:22 AM
54. 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...

• Replies: 0
• Views: 1,189
07-29-2013, 04:05 AM
55. 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...

• Replies: 0
• Views: 1,553
07-28-2013, 07:03 PM
56. 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?...

• Replies: 6
• Views: 1,515
07-28-2013, 06:36 PM

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