Hi, I'm new on this forum and new to statistics and SPSS as well (it is not my strong suit, unfortunately, but I have to do this for a project). I am trying to investigate the relationship between the frequency of cannabis usage and the respective alcohol, tobacco and illicit drug use in patients with a headache disorder. All the data I have is fictional, but in my assignment is stated that the data is acquired by a questionnaire that the patients have filled in.
I have divided my dataset into 7 different groups depending on the self-reported frequency of their cannabis usage ('never', 'incidental', 'sometimes', 'regularly' and 'past, incidental', 'past, sometimes', and 'past, regularly').
The variables 'alcohol use', 'tobacco use' and 'illicit drug use' are all categorical variables as well, as the patients could fill in 'yes', 'never', 'sometimes', 'quit' or 'NA'.
Now, I have found a way to get to know how many patients for example consumed alcohol 'sometimes' or 'never' in all of the 7 different groups by splitting the file based on cannabis usage and using the 'frequencies' option for the variables i wanted.
However, I am looking for a way to see if there is any significant difference between the distributions of alcohol usage (as well as tobacco and illicit drug usage) between these different groups.
Does anyone have any suggestions on how I can best approach this? I also think I need to find a way to convert these numbers into percentages as the 7 different groups are all different in sample size, so absolute numbers won't be useful in the analysis, right?
I have tried performing a chi-squared test as I thought it would be best suited for this type of analysis, however, it does not show the results I am looking for. I have put my outcome in the attachments.
I don't know if I have explained my issue well enough as English is not my first language, so if there is anything that is unclear please do say so.
Thanks in advance
I have divided my dataset into 7 different groups depending on the self-reported frequency of their cannabis usage ('never', 'incidental', 'sometimes', 'regularly' and 'past, incidental', 'past, sometimes', and 'past, regularly').
The variables 'alcohol use', 'tobacco use' and 'illicit drug use' are all categorical variables as well, as the patients could fill in 'yes', 'never', 'sometimes', 'quit' or 'NA'.
Now, I have found a way to get to know how many patients for example consumed alcohol 'sometimes' or 'never' in all of the 7 different groups by splitting the file based on cannabis usage and using the 'frequencies' option for the variables i wanted.
However, I am looking for a way to see if there is any significant difference between the distributions of alcohol usage (as well as tobacco and illicit drug usage) between these different groups.
Does anyone have any suggestions on how I can best approach this? I also think I need to find a way to convert these numbers into percentages as the 7 different groups are all different in sample size, so absolute numbers won't be useful in the analysis, right?
I have tried performing a chi-squared test as I thought it would be best suited for this type of analysis, however, it does not show the results I am looking for. I have put my outcome in the attachments.
I don't know if I have explained my issue well enough as English is not my first language, so if there is anything that is unclear please do say so.
Thanks in advance
