# slope

1. ### Power function - finding if the slope is significant or not?

Hi, I'm using power functions to look at a relationship between time and age and I need to be able to test whether or not the slope of this relationship is significant or not. I am using SYSTAT, but cannot find out how to run this and produce a p-value. Is this not possible to test at all...
2. ### Predictive value of X for a change in Y?

Hi everyone, R question: 10 participants underwent a weight loss programme, like so: mydata<-as.data.frame(matrix(c(140,125,120,115,110,110,110,105,100,90,85,100,140,70,100,100,140,120, 220,190,90,100,120,60,90,110,130,110,120,140,NA,65,110,50,NA,90,120,NA,130,150,NA,60,NA,45...
3. ### Response Feature Analysis--Word List Recall

Hi, I think I'm looking at response feature analysis, but I'm not sure how to go about this. FYI, this post refers only to providing descriptive results--no inferences are to be made. I am involved in a pilot study involving 2 groups of subjects (n=5 each) who will be given a 10-item list of...
4. ### How to determine significant diff or not btwn slope and intercept of two datasets?

Hi, this is for some research I'm doing in a lab, and I cannot for the life of me figure out how to determine if the two regression lines' slopes and intercepts are significantly different or not (I'm hoping they aren't!). From looking at the graph below, it seems obvious that they should not be...
5. ### Observed versus Expected Slope Comparison

Hello, I am performing an analysis (for dissertation project) where I am comparing the sum of branch lengths from phylogenetic trees reconstructed from altered datasets (Group 0) versus sum of branch lengths from phylogenetic trees reconstructed from control datasets (Group 1). Then I am...
6. ### Comparing Slopes Best Fit Lines Between 2 Groups

So lets say I have 2 data sets. Both sets contain various types of information about a person, including age as well as other factors relating to health (eg. cholesterol, blood pressure, etc) The difference between the sets is that set 1 is sampled from the general population and set 2 is...
7. ### Determining error of a slope based on a dependent variable containing error

I am currently attempting to compare the slopes of many linear graphs. Each graph is a plot of Time (independent variable) vs. Effect Size (dependent variable). I know the standard error associated with each measure of Effect Size. I want to know the error of the slope of each graph. However...
8. ### I dont know why finding an intercept is so hard

Thanks in advance to whoever helps =)! I am trying to find the intercept for a linear regression with 10 observations. Given: Sxy=120 Sxx=42 Sum of x=50 Sum of y=100 I found the slope it is 2.857. I have looked at all the formulas and decided that the means are what I really need...