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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: 196,800
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: 66,782
09-30-2005, 09:44 AM
1. ### Standardized Coefficients - Unit Problem?

Dear all, I am new to this forum and already wanted to thank all for reading and/or helping. I could unfortunately not find the answer to this...

• Replies: 0
• Views: 941
06-29-2015, 03:03 PM
2. ### Adressing endogeneity in panel count models

• Replies: 0
• Views: 1,035
06-29-2015, 01:39 PM
3. ### Need help with testing for significant differences

Hey all, it would be very nice if someone could help me! I want to test for significant differences in a dataset where I have 4 different...

• Replies: 0
• Views: 1,518
06-29-2015, 03:11 AM
4. ### Coefficient of Variation

Hi all, Please bear with me as I'm not a good stats guy. If I have a dataset of groups of people's weights with SDs: Group 1: 78kg (5): COV...

• Replies: 15
• Views: 2,763
06-28-2015, 11:47 AM
5. ### meta-analysis of proportion

Hi all, I am performing a meta-analysis on the occurrence of cerebral hyper perfusion syndrome (kind of stroke) after carotid artery stenting...

• Replies: 1
• Views: 2,021
06-28-2015, 09:54 AM
6. ### Is ANCOVA appropriate for this comparison?

For a project I'm doing: -I'm comparing Drug X versus Drug Y on blood glucose level -Subjects were given Drug X, glucose level was measured...

• Replies: 0
• Views: 1,419
06-28-2015, 08:51 AM
7. ### Is a McNemar's test appropriate in this setting?

I wrote a scientific paper on the use of two different surgical techniques on two organs in the same subject: technique A for one ovary and technique...

• Replies: 4
• Views: 1,673
06-28-2015, 06:15 AM
8. ### Hypothesis testing

The question is: A larger orchard has averaged 140 pounds of apples per tree per year. A new fertilizer is tested to try to increase yield. Forty...

• Replies: 1
• Views: 3,063
06-26-2015, 09:15 PM
9. ### Deducing Sample Size from Sample Proportion CI

How do I approach this problem? Suppose we want to estimate a sample proportion to within 0.05 with 95% confidence, how large will the sample have...

• Replies: 5
• Views: 1,456
06-26-2015, 08:48 AM
10. ### Assistance Requested in Determining the Appropriate Statistical Analysis

I am developing a mock research proposal. The study will be a RCT of 100 women from a health clinic. Both groups complete an initial questionnaire as...

• Replies: 0
• Views: 686
06-24-2015, 07:46 PM
11. ### k nearest neighbor - excel

Hey there! Just a quick one, does anyone have any idea on how one might go about learning how to effectively incorporate kNN formula into excel...

• Replies: 1
• Views: 4,132
06-24-2015, 03:54 PM
12. ### How do I solve regression equation for F2?

How do I solve/re-arrange this equation for F2? If the answer involves subtracting N2 and dividing by M7 then it will not work. I have already tried...

• Replies: 3
• Views: 1,414
06-23-2015, 07:55 PM
13. ### trying to predict range for next sample

I have an excel spreadsheet setup with row numbers in column a1:a1048576. I have taken 174 random row numbers from column a. Assume I am trying to...

• Replies: 2
• Views: 1,088
06-23-2015, 04:53 PM
14. ### (Anova)Comparing 4 Data

I have data of soil hardness from 4 different treatments I want to know if they are significantly different to each other or not. In Anova I can...

• Replies: 1
• Views: 960
06-23-2015, 12:00 AM
15. ### Low Cronbach's Alpha - What is the next step?

Heeey, I am a desperate as I need one answer to go on with my evaluation... In my analysis I have to do a variance based structural equation...

• Replies: 0
• Views: 1,597
06-22-2015, 08:54 AM
16. ### Problems Fitting Latent Growth Curve Model for BMI

Hi all, I have a question regarding panel data--collected biennially--from the National Longitudinal Study of Youth. (I use STATA 13.0 for Mac.) ...

• Replies: 0
• Views: 1,259
06-21-2015, 08:20 PM
17. ### Quick question: Parametric vs Non Parametric

Hi everyone! Just a quick question! I ran a Shapiro-Wilk test for normality and I have some normally distributed data as Age and others as...

• Replies: 9
• Views: 1,690
06-20-2015, 04:55 PM
18. ### MCEM normal distribution

Consider z_1,...z_n as a sample of observations of Z and y_1,...,y_n the missing data. Where Z~N(\mu,\sigma^2+1) and Y~N(0,1). i)Find...

• Replies: 2
• Views: 1,158
06-20-2015, 10:20 AM
19. ### Which Statistical Analysis would I use?

I am writing a fake study. In the study there are 3 groups which correspond to times. (1:00pm, 2:00pm and 3:00pm) The participants took a...

• Replies: 2
• Views: 879
06-20-2015, 05:28 AM
20. ### lme model with 3 categorical and 3 continuous variables - output coefficients?

Hi, I have a regression model with: 3 continuous variables 3 categorical variables - taxon= 4 levels --> I get 3 coefficients in the MLM...

• Replies: 0
• Views: 677
06-20-2015, 04:01 AM
21. ### Slovin's Formula

Who invented/formulated it? I already have done some research and all the results wasn't clear enough. I found one which states that Yamane's...

• Replies: 2
• Views: 3,593
06-19-2015, 04:43 PM

Hi dear statistics gurus, I searched online and this forum to answer my questions, but am still not 100% sure what I'm doing is actually correct...

• Replies: 0
• Views: 1,531
06-19-2015, 03:20 PM
23. ### Index Construction - Problems with var selection (low Pearsons R and Cronbach Alpha)

Hello folks :-) For info, I am using stata. I am trying to create a reflective index of political interest, measured by the interest of...

• Replies: 0
• Views: 705
06-19-2015, 11:02 AM
24. ### Need help with interpretation of Least Squares

Hey guys, I have trouble interpreting the results of a LS-estimation. All my independent variables are stationary. URATE (dependent variable)...

• Replies: 2
• Views: 1,375
06-19-2015, 06:32 AM
25. ### Can there be an advantage to rescaling covariates in a Logit model ?

Suppose i have some logit model with, say, 7 explanatory variables and i wish to add another variable, x8. x8 is in the interval and i would suspect...

• Replies: 0
• Views: 737
06-19-2015, 03:06 AM
26. ### Randomisation statistics

Hello everyone, I have a little bit of an issue trying to repeat the exercise outcome of a book I am learning experimental design from. I am...

• Replies: 0
• Views: 702
06-18-2015, 07:11 PM
27. ### Inclusive Average?

Hello all. It's been 40 years since college, and lately I've been pondering this. Say we have a set of numbers 10, 20, 30, 40. The average is 25. Now...

• Replies: 1
• Views: 998
06-18-2015, 05:30 PM
28. ### Deviation from the Projection

Sorry.. NA question

• Replies: 0
• Views: 845
06-18-2015, 03:15 PM
29. ### Regression Analysis help

Hi all, I've registered on this forum to get some help with Statistics. It is my stats exam tomorrow and I am stuck at a formula for doing a...

• Replies: 0
• Views: 893
06-18-2015, 01:20 PM
30. ### Question: Squared errors relative to benchmarks

Good afternoon, this is my first post in the forum as I would like to ask a question. I have some forecasts of Variance of two variables and their...

• Replies: 0
• Views: 947
06-18-2015, 10:52 AM
31. ### Cluster Analysis on Big data

I have a very large data set on booking price of the hotel packages which is containing approximately 10 columns and 100,000 rows. Majority of...

• Replies: 1
• Views: 1,110
06-18-2015, 06:13 AM
32. ### Error propagation - question

Hello, Was wondering if one could get help on how to calculate the error propagation for the following situation: I have a variable X with an...

• Replies: 0
• Views: 1,002
06-17-2015, 10:11 AM
33. ### Grouping/indexing variables

Me and a fellow student are working on our master thesis and have a statistic related question that we were hoping you could help us with? Our...

• Replies: 0
• Views: 837
06-17-2015, 08:50 AM
34. ### Population Size

I created a matrix to look at charge-off rates across two categorical variables, say (x1,x2,x3) vs. (y1,y2,y3). When I compare one cell in the...

• Replies: 0
• Views: 889
06-17-2015, 08:09 AM
35. ### Completely lost with Stats and need some help!

Hi everyone, Math is not my strong point and I am struggling with trying to figure out how to solve the following problem...any help you can offer...

• Replies: 0
• Views: 1,106
06-16-2015, 08:48 AM
36. ### How to score Confidence Intervals?

I am vaguely familiar with a few scoring methods, like Brier scores. So I get how to calculate a score when given a probability for a binary...

• Replies: 0
• Views: 1,131
daw
06-15-2015, 08:33 PM
37. ### Adding Hit Rates from Two Occasions with Unequal Trial #'s to Produce Sum Hit Rate

Hi, all: Imagine that you have two Olympic archers, and the archers represent the same country. One archer lands 63/208 shots (30.3%), and the...

• Replies: 5
• Views: 1,366
06-15-2015, 09:11 AM
38. ### variability over time

So I have 20 animals performing a task over three years (so there are up to 400 data points per animal). I want to discover if a) females are more...

• Replies: 0
• Views: 867
06-15-2015, 07:08 AM
39. ### Penalized quasi-likelihood

Can anybody explain me why the function glmmPQL(.) in R behaves in different ways, depending on the number of measurements/individuals you use?...

• Replies: 1
• Views: 1,335
06-14-2015, 09:21 AM
40. ### post hoc test for unequal sample size and variance

Hi.I have a three way and two way significant interaction in ANOVA but the sample size and variance of each group is different. What post-hoc test...

• Replies: 0
• Views: 1,746
06-13-2015, 12:04 PM
41. ### Hypothesis testing

test a claim that each can of soda contains exactly 11 oz. at the 3% level of significance, given that the mean volume of 10 cans of soda is 12.05oz...

• Replies: 1
• Views: 1,240
06-13-2015, 01:26 AM
42. ### What would you do if you had two very different Values of Cohen's D?

I conducted a factorial ANOVA.. and I found a significant interaction. I used two independent samples t-tests to conduct a further simple effects...

• Replies: 0
• Views: 862
06-12-2015, 09:28 PM
43. ### Estimating Multilevel Logistic Regression Models

The following multilevel logistic model with one explanatory variable at level 1 (individual level) and one explanatory variable at level 2 (group...

• Replies: 0
• Views: 2,114
06-12-2015, 08:01 AM
44. ### How can I figure out the raw score of this data set?

I must find the raw scores, z-scores, T-scores, and percentile ranks. Note: the Mean = 50, SD = 5. Raw z ...

• Replies: 1
• Views: 1,955
06-11-2015, 07:32 AM
45. ### Dummy variable stata13

Hi, I want to generate a new variable Turnover by genTurnover. I want to do that by compare the name of this year with the previous year. So my...

• Replies: 0
• Views: 967
06-11-2015, 06:18 AM
46. ### Overlap between groups

Hi everyone, I need some help on how to test overlap between two groups (men with sexual pain and men with sexual dysfunction) on their sexual...

• Replies: 2
• Views: 1,286
06-11-2015, 05:14 AM
47. ### How do risk models deal with state changes over time?

Let's say you are trying to predict if a machine is going to explode (0) or successfully complete its job (1), and you are trying to determine the...

• Replies: 0
• Views: 970
06-10-2015, 12:12 PM
48. ### Spss

Can anyone give me advice please? Where can I run SPSS online?:)

• Replies: 2
• Views: 1,129
06-10-2015, 04:04 AM
49. ### Regression Theory with pairs of points (xi,yi)

i = 1, ..., n Show that SUM(xi - xbar)(yi - ybar) = SUM(xi - xbar)yi Seems straightforward enough, just having trouble getting started.

• Replies: 3
• Views: 1,675
06-09-2015, 06:28 PM
50. ### Stata 14

Where can I run Stata 14 online please???:)

• Replies: 0
• Views: 2,023
06-09-2015, 12:46 PM

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