What if the T value is negative?
A negative t-value indicates a reversal in the directionality of the effect, which has no bearing on the significance of the difference between groups.
What does negative frequency spectrum mean?
forward traveling waves
Remembering that physically, sinusoids are waves, the sign of the frequency represents the direction of wave propagation. Simply put, negative frequencies represent forward traveling waves, while positive frequencies represent backward traveling waves.
Can you have a negative frequency?
If frequency is defined as an absolute number then there can be no negative frequencies, but if it is a real number negative frequencies can exist. You do need two signals to distinguish between positive and negative frequencies, the same as you need two numbers to define a complex number.
How do you find P value from negative T?
There are two cases: If your test statistic is negative, first find the probability that Z is less than your test statistic (look up your test statistic on the Z-table and find its corresponding probability). Then double this probability to get the p-value.
What does a negative P-value indicate?
A negative coefficient would indeed represent a negative relationship between that predictor and the outcome variable. For each b-value there’s a p-value that indicates the degree to which the value of the coefficient is abnormally far from zero assuming the null hypothesis were true.
Why there is no negative frequency?
To directly answer your question; no, there is no such physical thing as negative frequency. Frequency is the rate at which something happens, so by defintion it must be a positive real number. Likewise a quantity of physical objects can also only be a positive real number, e.g. I have 4 and a half apples.
What is the use of negative frequencies?
A negative frequency causes the sin function (violet) to lead the cos (red) by 1/4 cycle. The vector (cos t, sin t) rotates counter-clockwise at 1 radian/second, and completes a circle every 2π seconds. The vector (cos −t, sin −t) rotates in the other direction (not shown).
What does a negative p-value indicate?
What does the t-value indicate?
The t-value measures the size of the difference relative to the variation in your sample data. Put another way, T is simply the calculated difference represented in units of standard error. The greater the magnitude of T, the greater the evidence against the null hypothesis.
What does a high T value mean?
Higher values of the t-value, also called t-score, indicate that a large difference exists between the two sample sets. The smaller the t-value, the more similarity exists between the two sample sets. A large t-score indicates that the groups are different. A small t-score indicates that the groups are similar.
What happens if my p value is 0?
Anyway, if your software displays a p values of 0, it means the null hypothesis is rejected and your test is statistically significant (for example the differences between your groups are significant).