people who have manual labor jobs (n=18): average hours of sleep ranging between 6.7 and 8.2 with a median of 7.4

people who do not have manual labor jobs (n=12): average hours of sleep ranging between 4.7 and 6.9 with a median of 5.7

They want to see if there is a significant difference between the two groups and I need to give:

response and explantatory variable and type

appropriate null hypothesis

the...

What test should I do?]]>

I am new to this site but I'm glad I discovered it. I have a question for an apparently unusual analysis that I would like to do. I could not find a validated approach to do so but maybe it is simple...

I have a repeated-measure design with two within-subject factors: F1, 10 levels; F2, 2 levels.

I am looking at the effects of these two factors on two dependent variables, DV1 and DV2.

I know that DV1 and DV2 are associated and partly vary together across the 10 levels of F1. If...

Comparing multiple dependant correlation coefficients]]>

I am using PCA with PROC PRINCOMP to perform multivariate statistical process control and would like to build a PCA only on a certain set of individuals and let the others as supplementary.

Anyone knows how to do it?

I know this functionality exists with other software such as R.

Thanks in advance.

Cédric.]]>

To do this we have are using two measures one for the objectives which have a score ranging from 0-72 and one for quality of life ranging from 0-30. We do the measures at baseline, after 3 months, after 12 months and then each subsequent year. We would like to look at how the relationsship is from 0-3...

Help with correct statistical methodology]]>

I want to build a prediction model so I plan to use LASSO and elastic net (with glmnet). I was intending to split into 2/3 train, find the best shrinkage lambda (via CV in the training data) and predict on the remaining 1/3 (by c-statistic).

I was planning on say 50 test training...

developing and assessing a prediction Cox model using lasso]]>

Re-investment in buying a new machine/...finding mean?]]>

comparing the average of 2 groups when we

How do you calculate the

or just a simple average

Here is the following data I have;

Tenant Move In Date

Tenant Move Out Date

Rate Increase Amount

Rate Increase Date

Discount Amount (upon Move In)

The occupied square footage of Tenant

This industry is seasonal so there are higher Move Ins during the summer months.

Main questions;

1) What tool(s) should I use to find the mean, median, and mode for Tenants Duration?

2) What tool(s) should I use to...

Project LOS]]>

I am measuring the height of a tank over time to calculate the flux.

-F is the volume of tank F

-On every time point, the volume is measured 3 times (since the way of measuring is quite fault sensitive)

So F has an average and a standard deviation.

-Flux: (F(t)−F(t−1))/dt, in which dt is the time difference between the time points and A is a constant.

My question is: what is the standard deviation for the flux? The average is just performing the calculation with the average volumes...

Average and standard deviation]]>

How to choose a statistical test to compare brand ranking survey results?]]>

I have read various authors come to totally different opinions on this topic. ]]>

In Life

Some mock me for doing statistics

Some loathe me and statistics

Some don’t understand what statistics are

Why is it that statistics

Put a calm smile on my face?

Because of statistics I can solve the deepest mysteries

Because of statistics I will not be lonely again, playing in the data

Because of statistics I can rearrange the stars in the skies above

(by Chinese statistician Wang Jiaowei [translated],

The...

Statistics Poetry]]>

I am able to do part (a) by finding the Fisher's Information and using the theorem of Information Inequality.

However, I am very confused about part (b) and (c), as I have no idea what the distribution of S is (Bernoulli can be summed with ZT-Poisson?)

If anyone could provide solution with explanation, that would be great.

This is a question from my assignment that I was not required to complete, hence no...

Statistical inference problem - complete sufficient and UMVU estimator]]>

I have values of sales made for 20 months over two months period. The values are recorded as count per month and we have a hunch that the values were under-reported.

I am trying to build a statistical model to estimate the excess count. First of all I know I am to use a longitudinal count model but what I am not certain of is how to compute the excess count from my data using statistical model.

Please any suggestion is highly welcomed.]]>

I’ve just joined and am in need of any help that I can get. Basically I wanted to test whether phubbing ( snubbing someone to use your phone) impacts relationship satisfaction, sense of self-worth and respect for your partner.

Does anyone know what statistical analyses I would need to perform to test this.

This is the data I’ll be collecting:

Phubbing scale is 9 items rated on 5 point likert scale.

The couples satisfaction index is a 32 items rated on 5 point likert scale.

Respect...

Help URGENT deadline!! What data analysis method should I use to test the effect 1 variable has on 3 other variables ?]]>

I really need help with my statistics homework.

Probability of type 1 and type 2 errors]]>

Thank you]]>

Can someone please explain what are granular p-values? (or refer me to a friendly intuitive explanation)

Thanks!]]>

Share your functions & code]]>

I’ve just joined and am in need of any help that I can get. Basically I wanted to test whether phubbing ( snubbing someone to use your phone) impacts relationship satisfaction, sense of self-worth and respect for your partner.

Does anyone know what statistical analyses I would need to perform to test this.

This is the data I’ll be collecting:

Phubbing scale is 9 items rated on 5 point likert scale.

The couples satisfaction index is a 32 items rated on 5 point likert scale.

Respect...

Test of relationship? What data analysis do I use ?]]>

I do not understand why you need to use log() when the data is positive skewed for the picture?

Is not enough to read the data as a positive skewed only?

Info:

*I'm new in statistics

*The picture in in relation to article's content is takeon from this link below...

Why using Log in relation to Positive Skewed]]>

I need help in understanding the regression result. The dependent variable is the travel distance difference within partners. The independent variable is age difference within partners. My question is how to interpret the association between age difference and travel distance difference.

travel distance difference is the distance difference between male and female partners (Male distance -Female distance)

The age difference is a dummy variable in three categories: 1. M older...

'relative difference' as dependent variable]]>

Correct for multiple comparisons with two time points and contingent relations]]>

I am currently working on an analysis to see the effects of an ad campaign in Florida. I have 2080 observations (40 stores across 52 weeks) and there are 6 states represented. The ad happened during weeks 16 to 27 in Florida. My model is as follows:

Weekly Revenue = constant + B1 * Week2 Dummy + ... + B51 * Week 52 Dummy + B52 * Florida Dummy + B53 * Alabama Dummy + B54 * Georgia Dummy + B55 * South Carolina Dummy + B56 * North Carolina Dummy + B57 * Florida Dummy * Dummy for...

Measuring the Effect of an Advertisement]]>

I need help in understanding the regression result. The dependent variable is the travel distance difference within partners. The independent variable is age difference within partners. My question is how to interpret the association between age difference and travel distance difference.

travel distance difference is the distance difference between male and female partners (Male distance -Female distance)

The age difference is a dummy variable in three categories: 1. M older than...

Regression analysis - difference as dependent variable]]>

Thank you so much for your time and help!

- I have a group of objects A and a group of objects B. Objects of the A family and of the B family can touch eachother in X different ways.

- Let's say the objects are in a fixed position in a box, and I have Y different kinds of boxes.

- For each box I summed...

Help with data analysis for my thesis!]]>

It may sound really basic for some of you, but, can I use a hierarchical linear model if my participants are students nested within classes in two different schools?

The independent variable is only one (my therapeutic intervention), and my design has two groups (experimental vs. waitlist) within each class. Can I use the HLM to predict my dependent variable post- intervention based on my independent variable while controlling for demographic factors? I just want to make...

Hierarchical linear model/ Regression Analysis]]>

I have analyzed dependent and independent variable for 4 products and come up with an estimate for the 5th product using linear regression

y=mx+c.

Don't worry about the "y" variable. so I have y variable for all the 5 products. x variable in the above equation has been obtained using some parameter weights and scoring criteria below.

So for examples for all the 4 products and even the 5th one:-

Parameter Weights Scores

Market size 60% 5...

Parameter estimation]]>

The statistics shows that there are 79% male and 21% female workers. The number is fixed 790:210. Yet, all benefits are shared equally: 50%-50%.

Now I am in doubt, how much one as female has more chance to get the benefits, and how much one as male has less chance.

Is that as simply as 21 going up to 50, and 79 going down to 50?

Interestingly that is not possible if all would get benefits.

Now I...

A question from an amateur]]>

Thanks in advance for help.]]>

The mean of a Weibull distribution (2 parameter) is given as

u = a^(-1/b)*gamma(1+ 1/b)

In which case I can find an estimate for u by simply plugging in the mle estimate for a and b.

But I am interested in finding a confidence interval for u, not just a point estimate, but I have have no information about the distribution of u or its point...

How can I find an interval estimate for the mean of a Weibull distribution?]]>

Correcting sample response data (Likert scale data)]]>

"We tested whether the effect of a factor was the same, stronger or weaker after 2000 by comparing the log odd coefficient of a factor in the 97-98 cohort with that in the 2002-2003 cohort. For example the effect of unemployment rate was .2 in the 2002-2003 cohort versus .15 in the 97-98 one"

I thought it was considered invalid to compare effects across samples, because the variation of the samples was likely different. Or is it just not allowed to...

Comparing across two models]]>

Measure of similarity]]>

I need to read multiple dta files and exporting the content of a variable

called "name". My idea is to aggregate to the right each "name" from each

dta file. I made a simple loop and I know It works reading the dta files.

However, It can't say the same exporting the data.

Here is what I wrote:

Code:

```
library(XLConnect)
options(java.parameters = "-Xmx4096m")
setwd("C://Users//Jce//a")
file = list.files(pattern="\\.dta$")
myFiles <- list.files(pattern = "\\.dta$")
ttt=length(file)...
```

I have two group of variables (two separate groups of independent variables) and one ordinal dependent variable. I ran an ordinal regression for each group separately. After allot of work with a couple of guides I got the results (which mostly confirm what was expected) and I have a couple of Q:

- Can I use the results to determine which group of variables better predicts the independent variable? Which of the...

Reporting ordinal regression results]]>

Edit2: sorted...

Edit\(\infty\): sorted sorted...

I am trying to understand the variance calculation of remotely sensed data in the source code of a processing application. The software averages data spatially and temporally. For each satellite pass the data is spatially binned with a simple average. The binned data is then averaged temporally using a weight related to the number of observations per spatial...

Variance calculation in remote sensing processing software]]>

I have the forecast wave heights and the actual wave heights. I need to find how accurate the forecast wave heights were and therefore need the correct statistical test or multiple!

Thank you,

Jess]]>

i have acquired one plot from one of my system, to analyze the graph and extract the parameters i need to curve-fit it through one of the algorithm of regression.

it can easily be seen in the plot, the fitted one and the original one. now i have acquire the x and y points for the fitted one and i already have the original one's as can be seen in the points table. what i want to do now is to find out the error in between both the plots something like Chi-square and find out out...

CNLS (complex non-linear regression least square) Method, goodness of fit and chi square.]]>

Many employers are finding that some of the people they hire are not who and what they claim to be. This has led to a boom of companies providing credential checking services. Suppose that your company is recruiting new staff and you receive five applications for the advertised position. Further, suppose that the probability that an applicant would falsify information on his/her application form is 0,15. Assume that applicants falsify information on their application forms independently...

Have no idea how to go about this issue]]>

Code:

```
raise error("look-behind requires fixed-width pattern")
error: look-behind requires fixed-width pattern
```

Suppose we have 2 groups with 20 participants in each group. The groups are mutually exclusive. For any given participant they have some characteristic that is not mutually exclusive in that the levels are A, B, C, and D may be present in a participant in any combination. Participant 1 may have A, C, and D true while participant 2 may only...

In search of differences of non-mutually exclusive k categories over g groups]]>

Thanks, any help would be greatly appreciated ]]>

1) A multiple choice question (where users can mark more than one correct answer), let's call it variable a.

2) A single choice answer type question (radio button type), let's call it categorical variable b.

3) A continuous variable, let's call it variable c.

What is the best statistical test or method to analyze if a has an effect on b, and if a has an effect on c? I am particularly looking to understand how to...

Statistical Test for multiple choice questions]]>

How do i describe the sample when it comes to those areas? do i say " X number of people are from Y country" or what is there a test i can do on spss to help ? thanks]]>