You know, from the beginning, Bitcoin's price is really erratic. Nothing new, as for me. One thing, though, that is extremely noticeable is the fact that its value now is really enticing as compared to traditional fiat currencies.
On your question as to whether the erratic changes of Bitcoin for the past week matters, of course it does! Every minor movement matters because this will all be part of a data that will be used later on to predict future prices through trends. Alongside this, I suggest you keep your data accurate because all your future studies will devolve on it at a later time.
I agree with Qartesa. While most of us are used to the sudden inconsistent movement of the Bitcoin rates, it is still important to take note of such events as it may greatly help in predicting the future trends of Bitcoin through the use of different statistical analysis. An unstable and volatile Bitcoin rates may be, a correlation can still be established which will be of great importance in studying the trends to be established by Bitcoin in the future. For those who has been investing in Bitcoin for a long time, the occurrences that happened over the past few days are normal and bearable, I know that most people experience a far worse circumstance while handling Bitcoin. I believe in the world of Bitcoin, nothing is strange. Bitcoin is just really volatile to produce such uncertain rates.