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# Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

1. ### 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: 66,934
09-30-2005, 09:44 AM
2. ### 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: 197,119
07-16-2014, 11:01 AM
1. ### How to plot the following in R

I'm looking for a way to plot the following information regarding projection matrices with R: 1) N(t) = total population size in year t 2) The...

• Replies: 0
• Views: 919
06-03-2012, 03:30 PM
2. ### Function to multiply matrices repetitively in R

I'm looking for a way to multiple matrices several times in R using either a loop or function. I have a matrix A that is 4 by 4 and I need a...

• Replies: 5
• Views: 4,774
06-03-2012, 03:50 PM
3. ### Difficult Equilibria/Stability problem

I need help solving the following problem: The initial values can be made up. I have done similar problems but the algebra for this is...

• Replies: 0
• Views: 1,603
06-07-2012, 11:55 AM
4. ### What is the difference (employment wise) between MS Applied Stats and MS Stats?

Hello, I'm trying to find information on the difference between an MS in Applied Statistics and an MS in Statistics. I was under the impression...

• Replies: 0
• Views: 2,619
06-10-2012, 07:18 PM
5. ### Chi Squared Test (comparing to a normal distribution)

I'm trying to figure out how to go about solving the following problem: A random sample of 64 cities in the US indicates the number of rainy days...

• Replies: 1
• Views: 1,298
09-10-2013, 07:12 AM
6. ### Solving a permutations-combinations problem

Hi Could you please explain to me how to do the following question? "There are 12 beads in an urn, where 5 of them are blue, 4 are red and 3 are...

• Replies: 3
• Views: 1,801
BGM
03-28-2014, 06:02 AM
7. ### Test sensitivity for a given category or category sensitivity?

Hello everybody, I want to study several parameters (i.e. sensitivity, specificity, precision and F1-score) of a given test. To do so, I'm...

• Replies: 2
• Views: 419
07-13-2017, 11:37 AM
8. ### Ordinal or nominal?

I'm struggling to differentiate between different levels of measurements of variables. For example 'the level of motivation of conserving energy at...

• Replies: 5
• Views: 3,830
11-28-2011, 02:50 PM
9. ### Weibull Distribution Problem Help (Theoretical and Matlab)

Consider a Weibull distribution with the following pdf: f(x)= (Ɵ2/ Ɵ1)*(x/ Ɵ1)^( Ɵ2-1)*exp{-( x/ Ɵ1)^ Ɵ2} For x>0, Ɵ1>0, Ɵ2>0 (a) if now Y=( x/...

• Replies: 5
• Views: 4,907
06-03-2013, 05:00 AM
10. ### Macro to calculate Regression between variables.

Hello All, I am writing a macro to calculate the regression between each to variables among the 100 variables. My output is going to be a...

• Replies: 1
• Views: 1,764
05-20-2011, 12:04 AM
11. ### Macro to Cal regression between two variables (Mini__Tab)

Hello All, I am writing a macro in MiniTab to calculate the regression between each to variables among the 100 variables. My output is going to...

• Replies: 0
• Views: 1,703
05-20-2011, 12:05 AM
12. ### Would P-value be same for confidence level 95 and 99 in simple linear regression

In a simple linear regression task, I got same P-value for confidence levels 95 and 99. If above case is true Assume I ran a simple linear...

• Replies: 0
• Views: 1,866
04-07-2012, 01:34 PM
13. ### Hypothesis when seeking no differences

Hi everyone, and thanks in advance for any help that is offered. I am working on my dissertation proposal and hit a bit of a wall when deciding...

• Replies: 17
• Views: 3,463
03-17-2015, 03:00 PM
14. ### ANOVA past exam question help

Hi everyone, I'm looking over last years exam paper and one of the questions asks me to interpret an one-way independent ANOVA SPSS output and report...

• Replies: 0
• Views: 875
04-11-2015, 06:01 PM
15. ### Need help on Null and Alternative Hypothesis question

The Problem: A national organization has been working with utilities throughout the nation to find sites for large wind machines that generate...

• Replies: 5
• Views: 3,899
05-03-2012, 02:22 PM
16. ### 2 x 9 Chi-square analysis

Dear all, I am hoping for some advice/guidance on my statistical output. I have run a chi-square test in SPSS on a 2 x 9 grid. The output indicates...

• Replies: 1
• Views: 1,177
06-01-2015, 04:33 AM
17. ### Statistically significantly different percentages, I do not know how to answer this.

Adult Type 1 diabetics were randomly assigned to standard care or participation in a six week workshop lead by a diabetic specialist nurse. Of the...

• Replies: 3
• Views: 1,181
03-15-2017, 11:40 AM
18. ### Comparison of ordinal data - same subjects, same questions, 5 years later

Hi all, I'm looking for a good way to represent changes in ordinal-type data. I have 2 sets of data. In the first set, 50 companies (which...

• Replies: 0
• Views: 1,736
10-16-2012, 03:23 PM
19. ### Help With Repeated Measures ANOVA

Okay, so I have got 15 subjects, who had to perform a repeated sprint test (5 sprints) twice one with a supplement then the other with a placebo the...

• Replies: 2
• Views: 1,658
10-27-2014, 07:15 PM
20. ### paper on statistics

I'm doing a lab report aka paper on the "statistical analysis of the Precision of Electrochemical and Optical ph Sensors" I was wondering if there...

• Replies: 0
• Views: 2,551
11-25-2007, 03:55 PM
21. ### Test of Significance

I'm having trouble finding the P-Value and the Test of Significance: Zcrit and Ztest. This is data for pH values for electrode and optical) here...

• Replies: 0
• Views: 3,692
11-26-2007, 02:05 AM
22. ### Help me explain to my professor why he is wrong. (Correlation coefficients)

My professor (in psychology) has assigned the following question on correlation coefficients. Here is the question: What is the correlation...

• Replies: 2
• Views: 4,834
01-20-2010, 07:57 AM
23. ### Logistic regression with dummy variables and regular variables

Hello. My logit regression for a sample of 182 has 4 significant explanatory variables. One of these variables is a dummy variable and the rest...

• Replies: 6
• Views: 2,069
09-18-2013, 08:04 AM
24. ### Critical values for cointegration test?

Does anybody know where I can find critical values for the cointegration test? I need to know the critical values corresponding to how many...

• Replies: 2
• Views: 9,553
08-18-2007, 10:17 AM
25. ### Dealing with autocorrelation.

Every method I came accross so far uses some form of first-differencing, which kills my results. Is there any other way to deal with...

• Replies: 0
• Views: 4,932
08-24-2007, 02:16 PM
26. ### Is it OK to lag first differenced variables?

In a time series regression, where all variables are in first differences, to address the sationarity issue. Would that be OK to lag idependent...

• Replies: 0
• Views: 2,693
08-30-2007, 10:05 PM
27. ### Is t-distrubution the same as standard normal at infinity?

Hello, I am positive that t-distribution is exactly the same as standard normal if the sample size is infinitely large. I checked, mean,...

• Replies: 3
• Views: 2,657
03-12-2012, 11:11 PM
28. ### I am not sure how Central Limit Theorem, and the t-distribution fit together.

Hello, By Central Limit Theorem CLT if the sample size is large enough, the distribution of the sample means is approximately normal. This result...

• Replies: 7
• Views: 7,437
BGM
03-14-2012, 12:36 PM
29. ### 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: 1,739
08-06-2013, 09:27 AM
30. ### Which Statistical Test?

Hey all. I just performed a really nifty evaluation of a Zoo's educational program to determine the change in children's humane attitudes/behaviors...

• Replies: 5
• Views: 1,661
04-27-2012, 02:22 PM
31. ### Yes/No Questionnaire Analysis

Hey all. I'm having issues trying to figure out how to record and analyze some data I've collected. Here's the short story: 8 kids took before and...

• Replies: 9
• Views: 17,038
05-08-2012, 05:36 PM
32. ### Help with unbiased estimators

I'm working on a homework problem and the question I'm stuck on is as follows: "Give an unbiased estimator for 2µ+3σ^2" I'm not sure how I...

• Replies: 4
• Views: 2,758
12-11-2016, 04:37 PM
33. ### Help with data analysis of 7-Point Likert Scale needed

Dear all, I'm investigating perceptions of effective leadership of Germans and Indians. Part of the questionnaire assessed the attitude towards...

• Replies: 0
• Views: 479
07-17-2017, 06:57 AM
34. ### Is my variable count or measurement and what statistical model would be best?

I am trying to assess the fine-scale spatial distribution of tadpoles along a depth gradient in relation to abiotic and biotic factors -- and am...

• Replies: 7
• Views: 4,089
06-24-2011, 08:58 AM
35. ### Wich function do i use?

Hello all, Im new to SPSS and i have a question about wich function i need to use. I have 3 variables in my SPSS: School year, year figure and...

• Replies: 0
• Views: 931
04-19-2016, 07:01 AM
36. ### Significance of Simple Slopes in a 2-way interaction

I have used simple slopes to test a two-way interaction in a regression model. However, I get 1-tailed and 2-tailes significance results. It is my...

• Replies: 7
• Views: 8,730
03-11-2011, 02:35 AM
37. ### How to convert statistical counting error into percent?

Hello! I am trying to calculate appropriate error bars on a figure for a scientific paper. My original data was a simple count of # of photons...

• Replies: 0
• Views: 923
02-27-2013, 01:25 PM
38. ### How to Analyze: Comparing two proportions

Hello, I need advice on how to analyze a simple set of data. For simplicity's sake I'll make up the variables. Question: A store keeps track of...

• Replies: 3
• Views: 1,126
09-17-2015, 07:58 AM
39. ### Comparing Two Rates, Unequal Time Periods

For sake of simplicity I will make up an artificial example demonstrating my question. Say Player A scores 200 points in 800 minutes during a...

• Replies: 1
• Views: 1,172
09-23-2015, 06:59 PM
40. ### pls help decide test !!

I have collected data of 100 patients who had low vision. All these patients were given a specific device and vision was noted before and after...

• Replies: 3
• Views: 1,538
12-03-2012, 02:16 PM
41. ### Help with this Question

Hey could someone please help me solve this question A garden supplies company sells bags of potting compost in a variety of volumes. One of...

• Replies: 1
• Views: 2,266
02-20-2011, 10:09 PM
42. ### Statistical Analysis Intepretation

Hi guys, first post here, be gentle :) I'm trying to get my head around some data in an RCT for part of a critical appraisal essay i'm trying to...

• Replies: 0
• Views: 1,840
08-16-2010, 01:17 PM
43. ### Why is Mann-Whitney more powerful than Wilcoxon (in my data)?

I'm analyzing a repeated-measures ordinally-scaled variable in SPSS. I get more signficant results when I use Mann-Whitney tests (i.e. using the...

• Replies: 0
• Views: 2,358
05-03-2010, 09:28 AM
44. ### Planned contrast: opposite to predictions

I conducted planned contrasts (based on a one-way ANOVA). One of them yielded a significant result in the direction *opposite* to hypotheses. (No...

• Replies: 0
• Views: 2,564
05-14-2010, 05:19 AM
45. ### statistic help !

A and B are two events such that 0<P(A)≤1,0<P(B)≤1. Moreover, P(B|A)=1. Select the correct statement below. A. A and B are independent events. ...

• Replies: 3
• Views: 2,484
09-23-2014, 08:26 PM
46. ### Combination of two sample t-test and paired t-test versus MANOVA

Hello! I'm conducting a study where I compare one design with another. For my experiment I have also used a control and a treatment group, and I'm...

• Replies: 3
• Views: 1,923
05-27-2015, 03:57 AM
47. ### Comparing coefficients with different dependent variables

I have the following problem. I have the following model I use per sector (for example: Industrial, telecom, tech etc.): cccountry = a +...

• Replies: 0
• Views: 2,159
06-10-2011, 10:58 AM
48. ### MLE for multiple linear regression with errors that aren't IID

Hi, I'm trying to make sense of a homework problem. I've done basic maximum likelihood estimation problems before but always with independent random...

• Replies: 0
• Views: 4,079
11-09-2010, 06:49 PM
49. ### goodness of fit test( chi square test)

i want to find out test statistics and p value of different probability distribution by using chisquare test. distributions are 1. normal 2....

• Replies: 0
• Views: 1,223
12-08-2015, 04:53 AM
50. ### Sample size for Cronbach's Alpha

Hi all, I'm new for this forum,and I not strong in English language.I expect help from ur I want to know about the sample size for test of...

• Replies: 1
• Views: 5,285
08-18-2009, 07:57 AM
51. ### Need some help! for Sensitivity analysis

Hi, I'm Thai. I studying in master degree in Public Health in Thailand. I peformed the simple logistic regression for examined the ability of the...

• Replies: 1
• Views: 2,047
02-05-2011, 12:38 PM
52. ### Question about small sample difference between two means.

Hi, I was always told when I was using two small samples (n1 < 30 & n2 < 30) in a difference between two means test to assume that the population...

• Replies: 0
• Views: 2,607
05-07-2009, 01:53 PM
53. ### How can I use likelihood ratio test with my estimation problem?

I have a database that contains samples from two families X_1....X_n~iid Y_1....Y_m~iid I assume (even though it isn't true) that the samples...

• Replies: 2
• Views: 853
05-15-2013, 08:01 AM

Hello, I'm beginning my thesis project evaluating the inter-rater reliability of a risk assessment instrument. 90% of data is nominal (Y/N/DK) and...

• Replies: 0
• Views: 4,702
02-02-2009, 01:04 PM
55. ### average of percentages

I'm looking for a way to guage performance of website referrals over many websites. I'm not sure the number of referrals for a particular website is...

• Replies: 1
• Views: 4,171
10-14-2010, 03:14 PM
56. ### Help! How to choose my data bucketing!

Hi all! I have a very specific problem... I'd like to bucket my data (around 15k samples) into 50 buckets, but i don';t know how to most...

• Replies: 2
• Views: 3,165
11-10-2011, 09:27 AM

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