The market rate on the stochastic oscillator can never be negative. It will always be in the 0 to 100 range. In particular, a stock will have a market rate of 0 if the lowest value within a time period is also the most recent close. This suggests that the stock is consistently moving down and might not be likely to change. You can see if the stock has a chance of rising, but even then, it might take a while for a stock to move out of a hole as dramatic or difficult as this.
In summary, the stochastic oscillator should be used to give you an idea of what might come about when you are looking for a quality investment. The oscillator can help you see how the value of a stock might go up or down depending on whether it is being overbought or oversold. Compare it with other factors in the stock to see if it is the proper measure to use for your investment.