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Threads 2821 to 2880 of 2959

Forum: Psychology Statistics

Psychological statistics, quantitative psychology. Statistics in social sciences. Experimental design, data analysis.

Please provide us with some basic information before we can give useful advice: 1. purpose of the study / research question / hypotheses, if...

• Replies: 0
• Views: 32,119
11-10-2005, 12:21 AM
1. GLM Post-hoc analyses in SPSS

Hi and thanks! :) I'm trying to conduct a GLM analysis on phyiology data I collected from animals. Essentially, I am trying to determine whether...

• Replies: 0
• Views: 9,156
10-21-2006, 10:37 AM
2. dependent variable is between 0 to 10

:confused: Hi everbody,:wave: I have a guestion, the dependent variable I use take the values between 0 to 10, in this case can I consider the...

• Replies: 3
• Views: 3,798
10-20-2006, 07:50 AM
3. Need urgent help and advise

Hi, I am doing a research related to assessing the functional vision using self-reports (using a 5 point Likert scale) and performance measures....

• Replies: 0
• Views: 2,232
10-20-2006, 03:34 AM
4. Experimental design Stats help

Hi. I'm lost in statistics: Is a two factorial design. One factor is pots density (5, 15, 25) The other is the type of flower (A, B, none) I...

• Replies: 1
• Views: 3,531
10-19-2006, 04:58 PM
5. regression equation

Hi, I made a cubic regression as best fitting (r ² = 0,98496; P=0.0001) and the program gives me these coefficients: b -1,6716616717...

• Replies: 0
• Views: 3,525
10-18-2006, 05:41 AM
6. Which test to use: Comparing categorical data overtime

A group of subjects was tested and re-tested with the same set of measures over a 3-months interval. A total of three sets of scores were collected,...

• Replies: 1
• Views: 6,723
10-11-2006, 03:43 PM
7. Rmanova

HI, What is the formula of RMANOVA? What are the disadvantages of it?

• Replies: 0
• Views: 3,249
10-08-2006, 07:01 PM
8. Input order of respondents before performing cluster analysis

Hello, Would any body know the SPSS syntax command on how to specify the input order of respondents, before performming the traditional...

• Replies: 1
• Views: 3,594
10-04-2006, 07:03 PM
9. Regression Analysis

I would like to determine if exposure to a particular chemical contaminant affects the size of an organ (e.g. the liver) in a particular species of...

• Replies: 3
• Views: 2,914
10-04-2006, 03:56 PM

Hi I am trying to do some tests and I need some advice. I am comparing scores on two different questionnaires given to around 1000 people. The issue...

• Replies: 0
• Views: 2,952
10-04-2006, 03:22 PM
11. Need stats help on test results

Given the problem below - Suppose I used the combinatorial formula n!/r!(n-r)! to calculate the number of permutations possible to randomly select a...

• Replies: 4
• Views: 3,009
10-04-2006, 03:15 PM
12. Newbie question - repeated measures and non-parametrics

Hi all, I'm a little stuck, and am hoping that someone can help - my grasp of stats is a little shaky!:( I'm doing an animal behaviour and...

• Replies: 2
• Views: 2,709
10-04-2006, 02:16 PM
13. Question regarding logistic regression

Is it possible to use logistic regression when the predictor variables are dichotomous, but that the data was gathered from checkboxes- meaning the...

• Replies: 1
• Views: 3,097
10-01-2006, 10:33 AM
14. Normality and Homogeneity Testing

Okay, here's the scenario: We have a study with a negative control group, a solvent control group, and 5 treated groups. The statistical protocol...

• Replies: 7
• Views: 12,196
mcw
09-26-2006, 11:03 AM
15. sample size for regression analysis

How would I determine the sample size needed for doing a study using continuous variables (3) and two dichotomous variables? This is for a proposal...

• Replies: 1
• Views: 4,230
09-25-2006, 01:09 PM
16. interpreting results and selecting a model

Hi I have a problem with interpreting results from unit root tests and ACF and PACF tests. I have done all the calculations and now I do not know...

• Replies: 0
• Views: 3,785
09-23-2006, 08:39 AM
17. Chebyshev's Theorem and Empirical Rule

I am having a hard time understanding the following. The information leading up to the question goes as follows: " A major cab company in Chicago...

• Replies: 1
• Views: 24,007
09-23-2006, 06:04 AM
18. Logistic regression problem

Hi there, I'm doing some comparisons between characteristics of used and unused nest trees of birds. I have 155 nests and 155 randomly chosen trees...

• Replies: 1
• Views: 2,557
09-22-2006, 06:57 PM
19. Post hoc test for nominal variables

Hi, does anyone know how to do a post hoc with nominal variables in SPSS? I have 6 clusters and want to know which ones differ significantly from...

• Replies: 3
• Views: 5,453
09-18-2006, 06:04 PM
20. Line of regression.. need some guidance

Hello, I was wondering if you could guide me a little so that I can head off and do some analysis.. I'm looking to calculate 1. the time it...

• Replies: 5
• Views: 3,377
09-14-2006, 04:17 PM
21. prediction

If a researcher ran a regression at time 1 using 3 independent variables to predict Y (i.e., weight), is it possible to predict a change in weight...

• Replies: 1
• Views: 3,209
09-13-2006, 01:54 PM
22. Multiple observations...

Hi, I have a repeated measures design with two within subject variables. Under each of the four(2x2) conditions, I measure completion time for a...

• Replies: 1
• Views: 2,671
09-08-2006, 08:39 PM
23. About Values to detect Outliers using Box Plot

Hi, I was wondering if anyone could tell me why, when constructing a box-plot, it is always used that a value of: Q1-1.5*IQR or lower, defines...

• Replies: 2
• Views: 5,519
09-07-2006, 02:07 PM
24. non-linear combination of variables to obtain new ones

Hi, I have the following doubt: let's imagine I have a matrix of data with N variables (columns) and M rows (individuals, examples, etc...). Is...

• Replies: 0
• Views: 3,739
09-07-2006, 01:04 PM
25. My F Value equals zero

I am using repeated measures analysis with the mixed procedure in SAS. Comparing two periods with about 11 subjects. I have a non-significant P...

• Replies: 1
• Views: 17,968
09-07-2006, 12:43 PM
26. right stat technique?

Ind.Variable: A continuous variable Dep. Varible: B continuous variable I would like to know if there is a gender difference between boys and...

• Replies: 1
• Views: 3,313
09-06-2006, 11:21 PM
27. power analysis for logistic regression

I am a dentist working on a PhD thesis and recently my coleagues and I submitted a paper that assesed the effect of baseline factors (tooth type,...

• Replies: 1
• Views: 8,142
09-05-2006, 09:58 AM
28. Need help with MANOVA

Hi there, I'm working on a research project testing the social control theory of delinquency set out by Hirschi (1969). I have two separate...

• Replies: 6
• Views: 3,965
09-04-2006, 09:54 AM
29. need help with hypotheses adn appropriate stats

I have some research questions but not sure which is the right stat to use. I will list the questions as I wrote them and then what I think I should...

• Replies: 1
• Views: 2,736
08-31-2006, 08:37 AM
30. Non-parametric tests, data not meeting assumptions

Hello, Im at the stage where im banging my head against the wall!!!!:eek: Im testing the time of travel (in hours) taken for fish to cross a...

• Replies: 3
• Views: 5,094
08-25-2006, 09:35 AM
31. Converting from a 7- to a 5-point scale

I would appreciate the community’s assistance. I work in a unit that evaluates many training activities. In the past we typically used a five-point...

• Replies: 1
• Views: 11,742
08-24-2006, 08:47 AM
32. Post-test for nonparametrics?

Hi! I need some help regarding nonparametric tests doubts that are just *killing* me :(: 1) Is it mandatory to use nonparametric tests when I'm...

• Replies: 2
• Views: 10,975
08-21-2006, 01:18 PM
33. Central tendency measure for Broadband Speeds

I have collected over 120 observations of broadband internet speeds achieved through my service provider. The values range from, 5 kilobits per sec....

• Replies: 0
• Views: 3,872
08-14-2006, 01:18 AM
34. Measuring Change in Regression

We are working on a study to examine the effectiveness of a safety training program. Before and after the training, participants were asked to...

• Replies: 0
• Views: 3,283
08-13-2006, 09:29 PM

Hi all Can I get some help from you, I am a research student I developed questionnaire to get some information but after I get the results I am...

• Replies: 0
• Views: 2,193
08-09-2006, 05:51 AM

Admittedly, I am not so good at stats, so forgive me if these seem like stupid questions. I am working on a Ph.D. in cell/molecular biology, studying...

• Replies: 2
• Views: 2,536
08-08-2006, 05:15 PM
37. Likert scale problem

Hello, I am studying writing apprehension (WA) and have used Daly and Miller's (1975) Writing Apprehension Scale (WAS) -- a 5 point Likert scale...

• Replies: 0
• Views: 4,118
08-04-2006, 02:36 PM
38. Problem with linear regression

Dear friends, Purpose of this Q: First of all, I am a non-mathematics/statistics student. I am doing Ph.D in botany. I have a set of data. On the...

• Replies: 1
• Views: 3,443
07-28-2006, 06:12 AM
39. Factor Analysis: standardizing components

I hired a statistics guru to create a regression model to calculate sales quotas for our sales team based on historical sales data (DV) using several...

• Replies: 0
• Views: 3,236
07-21-2006, 12:46 PM
40. non parametric statistics

hello, I am a beginner,Need help pls Treatment structure: 2 supplements for pregnant dogs(treatment(trt) A and B) response variable is the number...

• Replies: 0
• Views: 2,681
ron
07-09-2006, 09:32 PM
41. contrasts

Hi, again questions where nobody has an idea, (or don't want to answer?) I want to work with orthogonal contrasts, also called a priori...

• Replies: 0
• Views: 4,041
07-06-2006, 11:58 AM
42. Help with intervals for dependent variables

Hello, I am needing some quick help. I have searched and searched and can't find a solution. I have some dependent variables that are a number...

• Replies: 4
• Views: 3,600
07-05-2006, 07:36 PM
43. non-parametric repeated measures effect sizes, help requested

Hi, I'm a university student from NZ. I'm currently attempting to establish effect sizes for non-parametric repeated measure variables. ...

• Replies: 0
• Views: 4,692
roo
07-04-2006, 12:28 AM
44. appropriate nominal-by-nominal in small samples

Hello, I was just reading your forum, and wondering if it is appropriate to do a chi-squared test with post-hoc if 44% of my cells have a count of...

• Replies: 0
• Views: 3,899
07-03-2006, 03:35 PM
45. Help solve a small controversy - research design help

There's an interesting controversy in audiophile circles. I want to compare two groups of subjects. The object is to see if subjects can...

• Replies: 2
• Views: 3,584
07-01-2006, 01:10 PM
46. Statistical test: newbie needs help on data analysis

Hi, I'm a newbie on data analysis and would like to have some advice on how to precede to analysis the following project. The study in concern is...

• Replies: 1
• Views: 3,535
06-30-2006, 11:14 PM
47. Seasonal Index - Statistics(Forecasting)

Here's the problem: The seasonal indices of the sales of garment of a particular type ina certain shop are given below, ----------Quarter...

• Replies: 0
• Views: 5,393
06-28-2006, 06:47 AM
48. before and after survey

I have the results of a survey (5 point likert scale) that has been done on a group of individuals before treatment and again after treatment. I am...

• Replies: 1
• Views: 5,295
06-26-2006, 03:09 PM
49. probit analysis

Hi, I have dose-response data (measurements vs. dead/not-dead) from several different treatments. For them I performed probit analyses to get 50%...

• Replies: 0
• Views: 4,209
06-26-2006, 08:15 AM
50. Can one use both parametric and nonparametric tests?

hi, I think this is where I should post this question. Sorry i am new. I was wondering if someone could tell me if i am on the right track. In my...

• Replies: 2
• Views: 8,628
06-22-2006, 06:11 AM
51. ANOVA & Tukey

Hi, I'm doing my research, studying on the effect of pH (acid-base) and ionic strength (IS, salt ions) on denaturation temperature (Td) of...

• Replies: 2
• Views: 5,174
06-19-2006, 02:43 PM
52. Questionnaire analysis

I feel a bit strange posting here, but everything's worth a try! I am trying to analyse a questionnaire that I designed myself (sadly, my design was...

• Replies: 0
• Views: 3,391
06-13-2006, 04:08 AM
53. notation question

I work with gifted elementary students and have received help from this forum before. We purchased a workbook that uses colons when representing...

• Replies: 1
• Views: 3,216
06-07-2006, 10:13 AM
54. division problem

Pourpose: I need the solution for a problem in my B. tech project. Hi all, I have 'n' numbers between 0 and 1 .... and there sum 'S' is known...

• Replies: 0
• Views: 2,575
06-05-2006, 01:44 AM

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