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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. ### Non Parametric alternative to a Mixed Measures ANOVA

Hi All, I am wondering if you can help me out with a problem i am having. Firstly, i have a single between subjects IV (gender) and then two...

• Replies: 2
• Views: 24,376
12-31-2008, 02:09 AM
2. ### What if ANOVA post-hoc isn't significant, but T-test is?

The general question I have is, what do I do when a post-hoc difference comparison of 2 means form an ANOVA (that has a total of 4 groups) shows no...

• Replies: 10
• Views: 24,285
06-10-2010, 05:42 PM
3. ### R-Square in Anova Analysis- How is it calculated?

In Anova Analysis ( on SPSS or Excel Data Analysis Tool pack), we find R-Square, and Adjusted R-Square in the first table. How is calculated? What...

• Replies: 2
• Views: 24,146
06-02-2012, 11:08 PM
4. ### How to Determine if 2 variables are dependent?

I'm trying to figure out whether or not citation flow and trust flow are independent of each other (here is the article containing the data:...

• Replies: 37
• Views: 24,104
07-31-2012, 05:46 PM
5. ### Regression: Standard Error of the mean interpretation?

Im not sure how to interpret the Syx. I have a Syx of 4.1037. So far i can tell to say , the Syx is relatively small in relation to .... ...

• Replies: 1
• Views: 24,066
05-29-2008, 10:41 AM
6. ### calculating population variance from sampling distribution variance

Hi all, Let's say that I want to estimate the population mean and variance of a large bag of popcorn (unpopped). I have a scale, but it's not...

• Replies: 8
• Views: 24,065
05-23-2010, 02:45 PM
7. ### How do you read a Z-Score Table?

Im trying to look up the right Z-value to construct a 95% confidence interval. I am using this table: ...

• Replies: 1
• Views: 23,940
04-08-2009, 11:49 PM
8. ### correlate interval and ordinal variables?

Hello, I currently fight with some statistical analysis for my thesis. I measured mean of heart-rate (continuous variable) during some timeframe...

• Replies: 3
• Views: 23,930
04-02-2012, 07:20 AM
9. ### Can chi-squared be used on count data with zero counts? If not, alternatives?

Hello I'm looking for a non-parametric test that works on count data with a few zero counts. Example data set: Cow pat 1: 137 (no ....

• Replies: 5
• Views: 23,886
12-06-2011, 12:10 PM
10. ### marginally significant p values

Hello, I was wondering if someone could shed some light on what constitutes a marginally significant p-value? It doesn't seem to me that there are...

• Replies: 2
• Views: 23,854
04-26-2014, 06:38 AM
11. ### Mann-Whitney vs Chi-Square

What is the difference between a Mann-Whitney U test, and a Chi-square. E.g. for testing marital status as an independent variable to predict QOL...

• Replies: 1
• Views: 23,839
06-11-2008, 01:16 PM
12. ### [Solved] How to graph a partial correlation?

Hi everyone, I would like to be able to make a graph for a partial correlation. Of course, to do so, I'll need the new X and Y values. I used SPSS...

• Replies: 5
• Views: 23,817
01-09-2011, 03:48 PM
13. ### P=0.05

Hello I have a question. I am doing a hypothesis testing, and I get a p value of exactly 0.05. Do I reject the null hypothesis or not, assuming a...

• Replies: 5
• Views: 23,701
06-12-2013, 12:33 PM
14. ### Correlations between dichotomous and continuous variables

Hello, I need to run a correlation in SPSS between two variables. One is a dichotomous variable (A). People have either answered the question...

• Replies: 8
• Views: 23,696
11-07-2013, 11:11 AM
15. ### Date data type: Qualitative/quantitative?

If it's quantitative, is it ratio or interval...? It seems a bit tricky to me because second is somehow quantitative but date is somehow ordinal...?

• Replies: 3
• Views: 23,435
10-11-2008, 03:46 PM
16. ### Squared Error vs Absolute Error loss functions

The two most popular types of loss functions are 1) squared error: (actual-estimate)^2 --> best estimate is the mean 2) absolute error:...

• Replies: 2
• Views: 23,340
07-25-2008, 12:45 AM
17. ### Need Help Asap!! (z-scores)

:eek: I am trying to figure out how to find the z-scores that separate the middle 88% of the data from the area in the tails of the standard normal...

• Replies: 2
• Views: 23,048
dml
12-06-2005, 12:05 AM
18. ### Estimating the standard error of a ratio of means,(standard error of each mean known)

Hi everyone, I'm stumped on a question based on dN/dS ratios in genetics. If I have two means, each with a standard error (same units), is there a...

• Replies: 2
• Views: 22,992
07-16-2010, 09:57 AM
19. ### Regression Analysis - what to do if population data is not normally distributed?

Hi all I'd like to conduct a regression analysis using the entire population's data which I have at my disposal. However, the data of the...

• Replies: 4
• Views: 22,932
11-15-2006, 03:15 PM
20. ### 82% Confidence Interval

Over the last 15 Major League Baseball seasons, the mean # of strikeouts by the American League leader is 258.5. Assuming that the # of strikeouts by...

• Replies: 2
• Views: 22,825
06-22-2008, 08:40 PM
21. ### How can I analyze data that is yes/no (I have it as 1/0)

-Hi, I have a 2x2 factorial ANOVA design. It has several variables measured, but the only one I can't figure out is the one for specimen movement. ...

• Replies: 11
• Views: 22,812
01-16-2011, 06:06 AM
22. ### Difference between a covariate and fixed factor

Hi, in a linear mixed model, what is the difference between a covariate and a fixed factor ? The best explanation I've been able to find is: A...

• Replies: 3
• Views: 22,745
05-27-2010, 10:39 AM
23. ### p1=p2 test statistic question

Hi I am now studying for my final which is tomorrow and i am doing some reviews how do i do this problem compute the test statistic used to...

• Replies: 4
• Views: 22,627
07-02-2009, 10:45 PM
24. ### Help! Correlation between Categorical Data & Interval data

Hi, I am looking for some basic stats help and would appreciate any and all feedback! Thank you in advance! 1. I am trying to correlate...

• Replies: 7
• Views: 22,586
08-11-2009, 02:36 PM
25. ### Non parametric equivilent to ANCOVA

Is there a non parametric test equivilent to an ANCOVA?

• Replies: 5
• Views: 22,549
03-17-2015, 12:54 PM
26. ### which optimal bin width formula to choose for histogram

For histogram construction, I learned from that for Gaussian distributed samples, 3.49*sigma*N^(-1/3) is optimal as the bin width. However, for...

• Replies: 16
• Views: 22,471
12-15-2011, 07:04 PM
27. ### Show that s^2 is an unbiased estimator for sigma^2

I am trying to complete a proof showing that s^2 = sum(Yi - Yi hat)^2/(n-2) is unbiased for sigma^2 In other words, show that E = sigma^2 I...

• Replies: 4
• Views: 22,451
10-06-2009, 11:22 PM
28. ### structural equation modeling (SEM), sample size

I require structural equation modeling (SEM) for a project, and I need to calculate an estimated sample size. I am not a statisician, so I don't know...

• Replies: 2
• Views: 22,042
02-04-2012, 01:52 PM
29. ### sample size calculation for a convenience sample

hi, first, can you calculate sample sizes for a convenience (non-probability) sample or just for a probability sample? i work in a clinic. i...

• Replies: 3
• Views: 22,033
10-19-2011, 12:35 PM
30. ### how to calculate prevalance of obesity in spss using bmi values

i am a newbie and i dont know how to calculate prevalance of obesity in spss using bmi values

• Replies: 16
• Views: 21,920
09-09-2012, 11:35 AM
31. ### Kuder-Richardson Reliability Coefficients (KR20) in SPSS?

Dear all, I am checking how to do a Kuder-Richardson Reliability Coefficients (KR20) in SPSS. I want to use the KR20 to learn about the internal...

• Replies: 1
• Views: 21,860
05-25-2012, 04:39 AM
32. ### Transform data to use ANOVA?

Hey, I have a set of non-normal data that I need to run an ANOVA on. Do you think I would get away with transforming the data to do it, since one...

• Replies: 19
• Views: 21,828
11-23-2011, 05:48 PM
33. ### when "normalizing" values, do i need to re-calculate SEM

hello, i apologize for the simple question, but i have no experience with stats. i have a data set that i am trying to analyze. i have calculated...

• Replies: 6
• Views: 21,616
09-21-2008, 12:24 PM
34. ### Interpretting Levene's test (Stata)

I looked this up quite a bit, and found alot about it, but I'm still not entirely sure if I got it right. I just recently got an assignment back with...

• Replies: 5
• Views: 21,604
09-13-2013, 08:24 AM
35. ### [Sponsored]Statistical estimations with Finaquant Protos – free .net library with tab

Hello all, We would like to introduce our non-commercial software for students and academic staff: finaquant® protos - free .net library with...

• Replies: 0
• Views: 21,540
02-26-2013, 01:38 AM
36. ### A question on means, adding and taking scores and standard deviation.

need a bit of help on my statistics homework. I've taken the class twice and no matter how much I study I seem to only be able to achieve a D. So...

• Replies: 3
• Views: 21,499
02-08-2010, 01:41 PM
37. ### How to convert ordinal into interval?

Hi all, i'm a new member here.. I have a problem, right now i'm on my undergraduate thesis, my thesis is about the relation between internal audit...

• Replies: 4
• Views: 21,415
08-18-2006, 02:35 PM
38. ### Correlation (data need to be normall distributed?)

Hi, today, I read through the chapter 'correlation' and there it is stated: the condition to apply either regression or correlation is that...

• Replies: 7
• Views: 21,337
11-22-2009, 07:12 PM
39. ### 2 way ANOVA posthoc VS pairwise comparisons

I am doing some research that I am analysing with a 2 way ANOVA, using SPSS version 17 software. The design of my analysis is: 2 between subject...

• Replies: 6
• Views: 21,259
04-19-2011, 09:05 PM
40. ### how to prove E(Σei^)=ΣE(yi^)-E(Σyihat^)

this formula looks simple but i really don't know how to explain mathmatically E(Σei^)=ΣE(yi^)-E i tried putting E(Σei^)=E but then don;t know how...

• Replies: 1
• Views: 21,070
01-27-2007, 02:17 AM
41. ### Regression: squaring variables in models

Ok I'm pretty sure someone will have a simple answer to this but I don't entirely understand it. Using a large dataset (2000+ cases) of...

• Replies: 3
• Views: 21,057
09-05-2008, 05:08 PM
42. ### What does P(z>1.65) translate to probability

Form the z table for standard normal curve, I am trying to find out the probability of z>1.65. According to z table, z score of 1.65 is 0.4505 ...

• Replies: 7
• Views: 20,989
03-27-2011, 01:01 AM
43. ### How to make a confidence interval

Hi. I'm interested in understanding the process of making (constructing?) a confidence interval for a normal distribution. Using a problem I...

• Replies: 2
• Views: 20,984
01-11-2011, 06:52 PM
44. ### ANCOVA test of homogeneity of regression slopes

Hi, I recently learned how to conduct ANCOVAs in SPSS and know that one of the assumptions that needs to be tested is the assumption of homogeneity...

• Replies: 2
• Views: 20,960
05-05-2009, 01:48 PM
45. ### Likert Scale Computation

Hello, i have a likert scale questionnaire where respondents will ranked questions 1(Strongly Agree)-6(Disagree). the research is about comparing...

• Replies: 4
• Views: 20,887
02-23-2012, 07:06 PM
46. ### Interpret Chi-Square Goodness-of-Fit Test?

Hi and thank you for reading this post, I ran a factor analysis on a scale and its data, and it came with a "Chi-Square goodness-of-fit" output...

• Replies: 13
• Views: 20,802
11-18-2011, 03:45 PM
47. ### What does the rho symbol mean for this statistics problem?

A part of a question on my homework is: X1, X2 are independent, uniform random variables. Calculate ρ_(x1+x2, x1-2x2). I don't know what I am...

• Replies: 5
• Views: 20,712
BGM
04-19-2011, 01:10 PM
48. ### T-value meaning?

I have done a paired t-test in the minitab and got the t-value = -4.78 and p-value = 0.001 My Null Hypothesis: The drug is not effective therefore...

• Replies: 3
• Views: 20,626
12-07-2011, 08:18 PM
49. ### Variance and sample size of the sampling distribution of the mean

Hello all, Im a postgraduate student doing a statistics assignment. I have been working through it steadily until I came across this question and...

• Replies: 2
• Views: 20,359
11-16-2010, 01:32 PM
50. ### Basic t score question

Is it ok to have a t-score that is negative? If it is negative, when looking at the t score table do I look at the number as a positive? Thanks

• Replies: 2
• Views: 20,313
12-18-2008, 10:05 PM
51. ### Can age be treated as normally distributed?

My thinking is that if you had an entire data set of everyone in the USA and viewed a histogram of their ages with a normal curve, it would appear...

• Replies: 4
• Views: 20,290
05-08-2010, 12:30 AM
52. ### help with SPSS output and repeated measures ANCOVA and MANCOVA

Hi, I was wondering if someone could recommend a good text on how to interpret SPSS output for repeated measures ANCOVA and MANCOVA (or maybe someone...

• Replies: 2
• Views: 20,249
02-14-2011, 07:06 PM
53. ### difference between sigma and standard deviation

please, what is the difference between sigma and standard deviation in quality control

• Replies: 1
• Views: 20,192
10-24-2011, 01:32 PM

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