# calculation

1. ### Adding up values of variables

Hey guys, I got a rather complicated problem: I have two variables, ID and Country ID Country 11 US 11 KR 11 CA 23 US 23 US 23 US 25 CA 25 JP 31...
2. ### Does SPSS VIF take into account multicollinerity involving intercept?

I am trying to find out whether multicollinearity involving the intercept is taken into account in SPSS' calculation of the VI in the REGRESSION procedure. I was unable to find an explanation in the official SPSS resources as to how SPSS calculates the VIF. The Command Syntax reference only...
3. ### Converting Numerical Value Ranges into Ordinal Values.

Hello everbody I need help with 2 issues. First one; When I use calculate values menu, and I create body mass index function from weight and height variables, and I say calculate, spss calculates BMIs and writes them in cells. But when I update information, BMI for that particular case won't...
4. ### Calculating with types of data

Why can't one compute with values such as 'M(ale)/F(emale)'? Can't I keep a counter of how many males and females were at an event? Am I not 'calculating' then? So am I actually assigning a ratio value (counter) to a nominal value (M/F) if I do this?
5. ### [HELP REQUESTED] Calculating Sample Size Based on a Pilot Study [HELP REQUESTED]

Good morning Talk Stats, I come to you after many hours spent on the web researching and working hard to find a solution. So far, I have been unsuccessful. Here is my situation: I am trying to calculate sample size needed for a immunohistochemical study. I have done a Pilot Sample which...
6. ### Survey Question with 4 Point Likert Scale and Yes/No Question

Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type questions and interview questions are 4 points. 1 = never, 2 = sometimes, 3 = usually, and 4 = always. Yes = 1, No = 0. If I add up all these with...
7. ### Power calculation in Critiquing Tool

Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely confused by the final question. It asks: “Did the study have sufficient power to detect a clinically important effect where the probability value for...
8. ### How do you calculate Skewness? Not the simple case...

Hello, To begin with I would like you to take into account that I'm not a maths genius, but I understand maths to a good degree. My question is how do you find skewness in univariate probability distributions that are both asymmetric and multimodal? I have two columns of raw data: x - Plotted...