Key words in sound track of the video and their influence on ranking in YouTube search results

for each of them. One channel was created for each account, and 5 pairs of video files were created for each channel; everything was done simultaneously. Videos were uploaded on 2 channels, by pairs, at the same time.
All videos were identical as for their timing, bitrate, resolution, title, description, and tags. The only difference was that in one video, key words were heard, whereas in the other weren’t.

search results. Videos were located together – one after another, inseparably. In order to construct graphs, we did as follows: those videos that had higher positions compared to their competitor were given 1 point, the lower ones – 0 points.
Immediate results after files’ uploading:

had similar positions, irrespectively of the fact if they had key words in their sound tracks or not.
Changes in 2 weeks: