I have a data set (df) with many columns, the names of which contain letters and numbers. For example

I have a data set (df) with many columns, the names of which contain letters and numbers. For example

I have a data set (df) with many columns, the names of which contain letters and numbers. For example

I have a data set (df) with many columns, the names of which contain letters and numbers. For example

I have many Latin name in my database, I want to check them all in rfishbase package and find their common names and put them in to the new column. I did not get success. I got an error. if you have any idea, I would be appreciated. here is the codes

I am trying to obtain data from Haver using R, I know that it is possible using Stata, here is the example code:

I have following time variable and I imported data from excel, cant make a correct class to run the model