test data

1. [R] - Test to say if I can accept or not my data in a right-skewed distribution

Hi, I'm new in Statistics world and I have a problem I don't know how to deal with. Sorry in advance for my English, I'll try to be as clear as possible. I have a dataset of 9000 machines that need to have a specific repair. For each observation I have the repair time used. I know from the...
2. Statistically Significant Data for Test Engineer

A common engineering experiment is to test something until failure to determine its ultimate break strength. Sample sizes can range from 5 to 100 pieces. I would like to know what statistical tests are used to make sure the data is good. Statistical tests that I am aware of are used to...
3. Mechanical Engineering Sample Test Size

You need to conduct an engineering 3-Point Bending. How many samples should you test? I was recently asked this in an interview but was not sure how to answer. I tried saying that it would depend on time, the readiness of the samples, and the cost of the tests but the interviewer said to...
4. Subgroup Statistical Testing

I am looking at the my company's termination data and comparing it to the data that was taken on the termination survey (30% response rate) and am trying to determine how to decide if the subset (survey data) is statistically a good representation for the overall terminated population? Is it...
5. How to analyse - [SPSS] NPI+Gender IVs on Attractiveness Score DV

Hi there, I have been struggling with stats for a while and have turned myself on my tail, any help would be super appreciated. Research is looking at Narcissism Score (NPI) and attractiveness, how would I analyse this in SPSS? I want to look at the relationship the two IVS have on Attract...
6. Variable importance in random forest

Hi, In order to predict a binary target variable, I trained a random forest with 84 explanatory variables (using 10 variables randomly selected in each split) on a training set composed of 8,500 observations. For practical reasons, I had to test the performance of the algorithm on a test...
7. Test to compare email open rates

Hi, I am trying to measure an email campaign and I have the open rates of emails from various segments of customers (there are about 10 segments of customers). Now, I see that open rate is , for example, 15%, 14.2%, 16% ,9%, etc. The number of customers in each segment is different. my...
8. Correct metodology to test observations

Hello to all, I have two datasets of rain measurements, the first observed at the ground level, and the second estimated from satellite radar at same location (pontual data), on daily basis. You can see in attachment the two histograms. I want to check if this two datasets came from the...
9. How to select the training dataset

I have a dataset which contains dependent variance Y and several independent variances X1, ... , X10. Y has 5 possible values: A, B, C, D, E, a proportion of each value is: A: 80%, B:10%, C:5%, D:3%, E:2%. I want to build a model to predict the value of Y, I decide to pick up 70% of the...
10. SPSS Help! What tests to use?

Hello friends! I am currently analysing some data I have collected about some patients, which includes their demographics and scale ratings based on their therapy and the therapy outcome. DEPENDENT VARIABLE: The therapy outcome. The outcome is their baseline pain rating minus their pain...
11. Help! Which test do I use and how?! *very rusty graduate*

Hi all I have been given some data and I need to do some significance testing on it. The data revolves around food types. Firstly I have been given data, about 1000 rows, of a food type with the date the food was bought and date it went off, I need to test whether after X number of days, a...
12. Predictive modeling challenge for SPSS experts.........!

Urgent! Need Help to build best Model for the problem Hi, I have a raw attribute data for 430 restaurants. Training Data: The set contains information about 430 restaurants. The target variable for every row is the aggregated weekly footfall named ‘Total’. I need to build their model...
13. Model building using Training data and predoction of Target set with test data

URGENT ! need help to build the Predictiive Model Hi, Need some help to solve the problem using right s/w(SPSS or execl) and approach . I have a raw attribute data for 430 restaurants. Training Data: The set contains information about 430 restaurants. The target variable for every row...