Okay, the user sent "co-variate". Let me check the translation rules again. The first rule is to translate all content into Persian. The second says if it's already in Persian, leave it as is. The third is to provide only the translation without explanations.
So, "co-variate" is an English term. I need to translate it into Persian. The word "co-variate" can be a noun or adjective. In statistics, it's often used as a noun referring to a variable that is jointly variable with another. The Persian translation for "co-variate" is "متغیر همتغییر" or "متغیر همتغییر". I should confirm the most common translation. Checking some sources, "متغیر همتغییر" seems correct. So the translation would be "متغیر همتغییر". Since the user wants only the translation, I'll output that without any extra text.