# What Does Y Hat Mean

**A few symbols have their own conventions.**

**What does y hat mean**.
Heres what it means.
This is me with my managers hat on talking.
In statistics the hat is used to denote an estimator or an estimated value.

The sample variance for example is often written as s 2 not σ 2 though some people use both to distinguish between biased and unbiased estimates. For example the sample mean is usually written as x with a bar over it or x-bar. Defined here in Chapter 3.

The least squares regression line is displayed in the following. Excel is used extensively for statistical work but does not support specialized statistical characters. The change on y with a caret represents the amount of which the price of a.

It can also be considered to be the average value of the response variable. All perpendicular to each other unit vectors. Vectors of length 1 pointing in a direction which defines the axis of the coordinate system so in cartesians would lie along the xyz axies.

What are the values of the hat. Is parallel to the x-axis is parallel to the y-axis and is parallel to the z-axis. X x-bar mean of a sample.

X x-tilde median of a sample. People have different levels of sex. The word horny is a slang term for wanting to have sex or being sexually aroused or excited.