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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: 197,336
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: 67,072
09-30-2005, 09:44 AM
1. ### Reason of using Peason distribution over Normal distribution?

Dear all, (Sorry about the typo, it is "Pearson" Not "Peason".) I am running an analysis of a manufacturing process flow. The measurement...

• Replies: 1
• Views: 1,046
04-22-2014, 08:09 AM
2. ### Correlation Across Time Help?

Hi I'm a bit lost as to how to calculate the correlation between two groups of numbers across time. I'd like to see if one group, taken from the...

• Replies: 1
• Views: 1,372
04-22-2014, 08:03 AM
3. ### SPSS help

Hi Can you help me with spss? where should i enter the pretest scores and post test scores of a control group and an experimental group?

• Replies: 1
• Views: 1,411
04-22-2014, 04:23 AM
4. ### No margins for chi-squared test with multiple categories?

This post has been deleted

• Replies: 0
• Views: 1,431
04-21-2014, 09:57 PM
5. ### Interpreting r² for non-significant results

Hi, Quick question about the interpretation of effect sizes. I was taught that (in line with APA formatting) you should always report an...

• Replies: 7
• Views: 6,066
04-21-2014, 09:02 PM
6. ### Which statistic should be used for each problem?

Hi I have a control group and an experimental group. I gave each a pretest and a post test. Which statistic should I use to get the results? Is it...

• Replies: 4
• Views: 1,830
04-21-2014, 03:24 PM
7. ### Solving an ANOVA

My online instructor's question wasn't very clear to me. It reads : Math is taught with a calculator and without a graphing calculator and by team...

• Replies: 0
• Views: 1,473
04-21-2014, 02:25 PM
8. ### How to work out min & max from values for range, median and mode

Hi, I was wondering if you could help me with the following (very basic) stats problem. How do I find out the minimum and maximum when I don't...

• Replies: 6
• Views: 1,618
04-21-2014, 02:20 PM
9. ### Fantasy Sports Contest - basic stats question.

Hi, this is a very newb-ish stats question so please forgive me. Background: I am playing fantasy sports contests and trying to figure out how...

• Replies: 2
• Views: 1,482
04-21-2014, 08:29 AM
10. ### Delta method

I was wondering if anybody can help me as I've been stuck on this problem for ages and my attempts seem to all be incorrect so far. I have four...

• Replies: 5
• Views: 1,521
04-21-2014, 07:32 AM
11. ### Regarding Metanalysis

Dear Colleagues Is it possible to conduct a metanalysis from case series (meaning non controlled studies)? the single arm of the studies will...

• Replies: 0
• Views: 1,228
04-21-2014, 05:16 AM
12. ### Help with ANOVA Analysis of Data

I need to compute: The sum of squares associated with sex from the ANOVA table; Create histograms of the data used in the ANOVA for each level of...

• Replies: 0
• Views: 1,454
04-20-2014, 08:50 AM
13. ### need formula can youn help?

find minimum sample size P(s2/sigma2 <1.75) >.95

• Replies: 0
• Views: 1,264
04-20-2014, 06:48 AM
14. ### how do i correlate these variables?

I am seeking make a correlation between two variables, however i am having a difficult time in choosing what to do. my report involves the setting up...

• Replies: 2
• Views: 1,839
04-20-2014, 01:17 AM
15. ### UMP tests, composite-composite

Hello, I am struggling a little with going from the simple-simple most powerful test, to the composite-composite UMP test. My book had an example,...

• Replies: 0
• Views: 1,081
04-19-2014, 11:51 PM
16. ### observed z ratio

When null hypothesis is population mean 1 = population mean 2 given population s variances and sample sizes and sample means I calculate the SE...

• Replies: 0
• Views: 1,126
04-19-2014, 09:19 PM
17. ### Logistic Regression

Hello, I am evaluating a scoring system to predict success of a particular type of cardiac surgery. This involves 5 predictor variables, these...

• Replies: 1
• Views: 1,511
04-19-2014, 07:38 AM
18. ### Senior project statistics

Hello all, I am currently working on a senior project for a soil science degree and had some questions about my project statistics. My group is...

• Replies: 8
• Views: 2,133
04-18-2014, 09:11 PM
19. ### Standard error of estimates

I have the standard error of P (which is an estimator), and W is a constant, and now have the following equation E=W*sqrt(p) to obtain E as the...

• Replies: 3
• Views: 1,096
BGM
04-18-2014, 08:19 AM
20. ### Which test to use?

I have 3 groups-A, B, C. No. of respondents in each group A-120, B-120, C-30. Each group has an index about a topic. There are 14 such topics. ...

• Replies: 1
• Views: 1,139
04-18-2014, 04:44 AM
21. ### Making Statistical Inferences Based on Historical H.S. Graduation/Retention Data

Thank you in advance for your help with this matter, I greatly appreciate your assistance. I work at an alternative high school in Oakland, CA and...

• Replies: 0
• Views: 1,152
04-18-2014, 12:56 AM
22. ### Calculating Absolute rate reductions with Count Data

Hello everyone, I'm analyzing count data in stata using negative binomial regression because of overdispersion. I'm reporting incident rate ratios...

• Replies: 0
• Views: 1,062
04-17-2014, 09:42 PM
23. ### Help with weighted average

I was given a data set as follows (sample) is to do with processing time of forms: 1 day am***** 1 day pm ***** 2 day am * * *...

• Replies: 0
• Views: 1,189
04-17-2014, 09:34 PM
24. ### Bio Log Survival Data Normalization Question

I have been attempting to compare two sets of data points in log form utilizing a student t-test difference of means test and have been running into...

• Replies: 0
• Views: 1,043
04-17-2014, 03:15 PM
25. ### Sample size for small proportions

I am trying to determine what sample size for proportions I need. I know that historically, p has been small (way less than 0.5). If I use the...

• Replies: 2
• Views: 2,665
04-17-2014, 03:08 PM
26. ### Polynom/spline/function for "upper and lower limit" (± 2 SD)

I have some hemoglobin values from children aged 0-18 years. I'd like to produce reference ranges for hemoglobin based on these values. Let's say I...

• Replies: 3
• Views: 7,724
04-17-2014, 07:40 AM
27. ### Create bell curve with a discrete variable

Hello everyone, I like stats but I must warn you that I am far from an expert so please forgive me if my question is a bit basic :). My issue...

• Replies: 1
• Views: 1,227
04-17-2014, 04:36 AM
28. ### Standardizing ranks?

Hi guys! I'm currently working on a project a bit outside my comfort zone and I'm kinda stuck. I'm supposed to do correlations and multiple...

• Replies: 0
• Views: 1,822
04-17-2014, 04:20 AM
29. ### Normal Probability Plot of Effects

Hi, I am trying to estimate the effects of a 2^3 factorial design with three duplicates. I am trying to create a normal probability plot of...

• Replies: 6
• Views: 2,888
04-16-2014, 05:10 PM
30. ### Confidence Interval Help

Hello :) I have a question in my homework that states: "Lorraine computed a confidence interval for μ based on a sample size of 41. Since she...

• Replies: 3
• Views: 9,058
04-16-2014, 03:11 PM
31. ### Interpreting confidence intervals

Hi I got a 95% confidence interval ranging from .0000 to .0001 on SPSS. I know the rule that if a CI doesn't go through 0 then the p value will be...

• Replies: 2
• Views: 1,429
04-16-2014, 02:38 PM
32. ### Cohens D and Statistical Significance

I've read that a low scoring Cohens D can be seen to undermine a significant result, however is the opposite true? Can a high Cohens D undermine a...

• Replies: 10
• Views: 3,139
04-16-2014, 01:44 PM
33. ### cut-off for CV (coeff. of Variation)

What is considered a cutoff for Coefficient of Variation as too volatile, mainly speaking for normal distributions? Thanks

• Replies: 0
• Views: 4,036
04-16-2014, 08:58 AM
34. ### Best Way to Present Non-Normally Distributed Data

Hi, I wondered if anyone could give me advice on the best way to present two sets of continuous (not normally distributed) data. Would median ±...

• Replies: 3
• Views: 2,750
04-16-2014, 02:49 AM
35. ### Am I correctly generating my p-values?

Hi, I am a doctor in the UK, and did a (very) little bit of undergraduate statistics >10 years ago. I am preparing an abstract for submission for...

• Replies: 4
• Views: 1,592
04-16-2014, 01:31 AM
36. ### 3 Factors (2 Fixed, 1 Random) - Selecting and applying the appropriate model

This is related to a homework question. I've had trouble finding info on models with 2 fixed and 1 random factor. Any input guiding me in the right...

• Replies: 1
• Views: 1,253
04-15-2014, 10:58 PM
37. ### Comparing one rater with a group of raters

Hi all, I'm working through a research project, and am looking for advice. Students were asked to work through a simulated clinical scenario and...

• Replies: 0
• Views: 1,208
04-15-2014, 09:43 PM
38. ### Significance level help

Hey guys, i have this homework here : http://image.noelshack.com/fichiers/2014/16/1397585977-work.png So tell me if i'm wrong : H o > 25 H...

• Replies: 2
• Views: 2,750
04-15-2014, 09:24 PM
39. ### Mixed Model F-Test

A (Random-4 Levels) B (Fixed-5 Levels) C (Random-3 Levels, Nested in B) reps = 6 Experimental Units per treatment combination of (ABC, total...

• Replies: 0
• Views: 1,296
04-15-2014, 08:43 PM
40. ### Determining defining contrast subgroup from design matrix

I have the following design for studying five variables in eight runs in four blocks of size two (k=5, p=2, q=2) \begin{tabular}{rrlllllll} ...

• Replies: 1
• Views: 3,277
04-15-2014, 03:16 PM
41. ### mixed designs and repeated measures

I want to see the effect of 3 treatment types on two dependent variables, heart beat and sweat produced. Dependent variables are measured at three...

• Replies: 0
• Views: 1,046
04-15-2014, 10:24 AM
42. ### T-Test Help

Hi I am totally new to stats and finding it very difficult. I was wondering whether or not anyone could help me understand which T-Test to use to...

• Replies: 0
• Views: 1,062
04-15-2014, 08:38 AM
43. ### Computing the test statistic: Not sure which Formula I need

Not sure which formula to use... A Health and Fitness company would like to determine if a new product improves cardiovascular fitness. A sample...

• Replies: 0
• Views: 2,123
04-15-2014, 08:19 AM

I would greatly appreciate some statistics advice on the most appropriate test to answer our research questions. The aim of the research is to...

• Replies: 0
• Views: 1,173
04-15-2014, 02:29 AM
45. ### Statistics Help

I haven't done anything statistics related in quite a while. I am helping a friend with some hw and I am stumped on what I am sure is a simple...

• Replies: 0
• Views: 1,672
04-14-2014, 10:20 PM
46. ### Appropriate statistical test for RIFLE Criteria

I need help choosing the appropriate statistical test for my primary endpoint of my resident research project and thought I'd join a forum to help...

• Replies: 1
• Views: 1,174
04-14-2014, 05:37 PM
47. ### Unsure as to what test to use to analyse my data.

Hi there, My dissertation is due in a couple of weeks and I would really appreciate some help. My investigation involves analysing the ability of...

• Replies: 0
• Views: 1,393
04-14-2014, 01:49 PM
48. ### Constrain a value to be between -1 and 1

• Replies: 16
• Views: 3,124
04-13-2014, 11:57 PM
49. ### Statistical test interpretation

Hello, Firstly, sorry if my english is bad, I'm French. I wondered if I understood well how to interpret the result of a test, such as the...

• Replies: 2
• Views: 1,849
04-13-2014, 01:59 PM
50. ### Expected and observed frequencies- is chi squared goodness of fit suitable?

0 0 0 0 0 0 0 0 0 0 0

• Replies: 0
• Views: 1,278
04-13-2014, 07:34 AM
51. ### Centering predictors in regression analyses and geometrically transforming means

Hi there, I'm confused about which variables to center in a regression analysis. In block 1, I have sex and 2 continuous variables, which are...

• Replies: 0
• Views: 1,323
04-13-2014, 05:15 AM
52. ### Multilevel Analysis

Hi I am currently working on a research project that involves PhD students. The data is hierarchical as the students are nested within PhD...

• Replies: 2
• Views: 2,165
04-13-2014, 04:21 AM
53. ### Likelihood ratio test for two Poisson variables

I have two variables: X1 ~ Poi (λ1) and X2 ~ Poi (λ2), with n1 = n2. How can I use a likelihood ratio test to test the null hypothesis H0: λ1 = λ2?

• Replies: 1
• Views: 2,655
04-12-2014, 04:50 PM
54. ### Confidence Interval and Sample Sizes for Proportions

Having trouble with a specific problem. A federal report stated that 88% of children under age of 18 were covered by health insurance in 2000. How...

• Replies: 3
• Views: 2,420
04-11-2014, 02:10 PM
55. ### statistical significance of sequence

Hi, Suppose I have a set of sequences of length n with symbols from an alphabet A = {a1, a2, ..., an} A particular sequence may appear multiple...

• Replies: 2
• Views: 1,566
04-11-2014, 01:16 PM
56. ### research help: correlation between two non numerical variables. Which Test ?

I am Optometrist studying for a diploma in school vision. My research involves testing Taekwondo and Dance students. I want to establish whether...

• Replies: 1
• Views: 1,024
04-11-2014, 01:11 PM

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