Data from solar observations with the RATAN-600 radio telescope in the 1–3 and 3–18 GHz ranges were processed using multivariate statistical methods. This kind of analysis allows us to differentiate the radio sources in the active regions (ARs) on the Sun by their individual flux spectra and trace their evolution during the entire time they have been in sight, as well as to reveal fast processes in a narrow spectral range or in certain areas. It was found that we can isolate twisted magnetic loops in flare-productive ARs in our data, and detect gyrosynchrotron radio emission caused by the non-thermal electrons inside them. Also, we detected an absorption line close to 1.6 GHz with a variable frequency shift in several AR. It may be attributed to the hydroxyl in cool coronal mass, such as solar prominences and coronal rain.