# How to start building a statistical regression analysis model with multiple categorical/discrete input variables of high dimension in Python

I'm fairly new to data science and ML. I have data of an item going through a release process. I have collected data on various variables such as "product category", "product line", "design country", "hour of day started" and I also have data on "total time" which is the time it took the item going through the entire process. In total I have 18 different input variables where each variable is either a categorical or a discrete number such as "hour of day started".

Design_cntry      Prod_category    prod_line   ...   time_minutes
A                  A1             A11       ...     43.2
B                  B1             A11       ...     20.1
C                  E1             B11       ...     15.0
...                ...             ...       ...     ....


I want to build a statistical regression analysis model in python which outputs the probability of a statement. Say for instance P(time > 1000 min | product category = A, product line = B, ... ) and am wondering how to tackle this problem? Are there any general ways of doing this? Or good articles/literature on this topic anyone could recommend?

I only have non negative data, so maybe there are any good regression forms based on exponential distributions?

First, you have to pre-process your data. it includes encoding your categorical variables. You can either do it using pandas.get_dummies, or sklearn.preprocessing.OneHotEncoder in your pipeline. Based on the algorithm you want to use, you usually have to standardize your numerical variables. this can be done using any of sklearn.preprocessing methods such as StandardScaler.