# pearson correlation

1. ### Hvpotheses testing

Hello, please give me instructions with testing the hypotheses: H1: No relationship between predicted and collected data for model 1. H2: No relationship between predicted and collected data for model 2. H1 is tested using predicted model 1 data (pm1) and collected data (cd). H2 is tested...
2. ### Pearsonn Correlation Coefficient of Averages

I have a question regarding using PCC in a specific scenario. Suppose I have 10 subjects of different ages. I want to know if there is a correlation between age and a specific parameter. That parameter for example is the area of pituitary cells. So in essence I want to know if there is a...
3. ### Corelation between two dichotomous variables

I have a data from a research with responses (yes/no) about three questions (A,B,C) and I would to see if the variables are correlated. First of all i compared the proportion of agreement(yes-yes, no-no) of them. The results was: A-B= 78% A-C=59% B-C is out of my objective. So I run a Pearson...
4. ### Difference between Mann-Kendall and Pearsons Correlation to obtain p-value

Hi, I am carrying out an analysis about Vegetation and Time. I did a simple linear regression and I got the correlation between both variables (Pearsons). Now, I would like to get the significance of the data. I got the significance (p-value) carrying out "Pearsons Correlation" but my question...
5. ### Should I use Pearson or Spearman correlation?

I have to know whether two variables are correlated or not in a sample. None of them are normally distributed, so I assumed that I should run Spearman's correlation, which gave me a correlation coefficient of 0.392 (p<0.05, and Pearson's correlation was equally p<0.05). My problem is that now I...
6. ### Pearsons Correlation, Two-way ANOVA, Linear Regression Test, Chi-Square Test or None

During research, you have asked your participants whether or not they have ever experienced financial difficulties (yes or no). You have three age-groups (16-20; 21-25; 26-30), and you predict that those in the 26-30 group have a greater risk of experiencing financial difficulties than those who...
7. ### How to combine data sets to do a pearson correlation

Hi, I want to calculate the pearson correlation between 2 variables, namely the expression level of 2 genes measured in biological samples. The problem is that the sample size is small (n=5). However, I also have 2 other similar data sets obtained previously with another methods. So I would...
8. ### What type of correlation analysis should I use?

So I made a questionnaire with one part being sort of a quiz with right and wrong answers, along with "Don't Know" answers. I took all these, recoded them so that the right answers are 1 and the others are 0. After that, I used Compute to give out: right answers/total # questions. There are 13...
9. ### ?Pearson ?point-biserial correlatiom coefficient for relationship between variables

Hi, I'm new on this forum, thanks for reading my post! I'm trying to figure out if I've used the best method for determining a relationship between variables (calculations done using Excel). I have a cohort of 38 trauma patients of different ages. I have measured their aortic diameter on...
10. ### Linear relationships between variables from different, but related data sets.

I had a quick question. And I am sorry if it seems elementary, but I just have so much trouble with statistical analysis (I use R when I do it generally though). I am trying to test the correlation between the % coral cover at each of my study sites, and the % of coral in sediment collected...
11. ### Question about a Pearson's Correlation - r, p, sig

this is the resulting table from a t-test... variable1 variable 2 variable 1 Pearson Correlation 1 .344 Sig. (2-tailed) .404 N 8 8 Variable 2 Pearson Correlation .344...
12. ### Significant p-value, but 95%CI includes 0

Hello everyone, I have the following problem: The result of a Pearson correlation (sample size = 177) was significant, r = .127, p = .048 (one-tailed). However, the 95% confidence interval includes zero, 95% CI [-.02, .27]. How is it possible to have a significant p, when the CI...
13. ### Low or high correlation?

What does it mean when Pearson correlation gives a value of 0.7-0.8, while spearman correlation gives a value from 0.3-0.4? Pearson reports high correlation while Spearman report weak. Should I conclude that the correlation is weak using spearman since the data seems skewed?
14. ### Primer - using BEST and Pearson's correlation for MDS.

I am using primer to display community data using MDS. I have the manual and "change in marine communities" that I have been using to guide my analysis. I ran the MDS, then BEST, and then displayed the environmental vectors with Pearson. I need to know the finer details of how BEST and...
15. ### Correlation between Binary (presence/absence)and Continuous Data

Thanks for the help in advance! I have a binary variable (1 or 0) that describes if a species is present or absent in an area. I also have a list of various crop acreages (continuous variable). I want to correlate the two to see if a certain crops acreage is correlated to the species...
16. ### Significance testing for biserial correlation

Hi, I have run an analysis outlined below. It would be great if the group could tell me a) if this approach is appropriate and b) if the result is significant (to 95% or 99% level). Approach I have 20,000 survey responses to the question 'how likely are you to recommend my event to a...
17. ### Likert item data- which test to use to see if there is a relationship between groups

Hi, I have been given some data and I am trying to statistically analysis it. The data is from a survey in which 202 students were asked what is important when considering a university. They were given 15 things (sets) such as cost, course options, location ext and asked to rate it using a...
18. ### [Parametric/Non-Parametric Correlation] - Which should be used?

I have a data set consisting of waist size (cm) and weight (kg) of a group of people. I am looking to see if the two variables are related, and I assume a correlation test is the method I should be using (I apologise - I'm very new to SPSS and stat analysis in general). I understand that the...
19. ### How robust is Pearson's Correlation to Normality violations?

Hi Guys, I can't seem to find a definitive answer to this question: can one run a Pearson's correlation on data that is not normal (but has no outliers). Some texts say you need to obey this assumption, other authors say that it is robust. The problem is, is that my data is negatively skewed...