Several variables are required to decide on a direction

Just two, acceleration and gravity, as long as these two conditions are met, everything is fine.

The regression coefficient b in univariate linear regression analysis can be expressed as ( ).

a Degree of correlation between the two variables.

b The direction of the correlation between the two variables.

c When the independent variable increases or decreases by one unit, the average increase or decrease of the dependent variable d When the dependent variable increases or decreases by one unit, the average increase or decrease of the independent variable e There is no correct option BC

You look for panel data for "fixed-effect models" and "mixed-effect models".

I have a courseware, but it's relatively simple. It is recommended that you search for it, many of the applications of mixed effects are time series models, and the panel data should also include multiple cross-sections, and multiple independent variables are multivariate time series models. For example, if we consider multiple financial indicator variables of a company from 2000 to 2010, which include both time and multiple independent variables, it is a time series model. But if you consider the changes in several financial indicators of a number of different companies from 2000 to 2010.

Do professional data analysis, come to me.

In the process of economic operation, there is a wide range of time lag effects. Certain economic variables are influenced not only by various factors in the same period, but also by various factors in certain periods of the past and even by their own past values. This kind of hysteresis variable in the past period is usually called a lag variable (lagged).

variable), a model with a lag variable.

I don't think so, if it's a panel

Data is of course fine.

If it is time series data, you can use var and cointegration.

That is, the speed of change of these two variables in the same direction is the same, such as change in temperature and distance. There's the concept of vectors here.

The base interest rate of the interest rate is determined by the state, federal or union-controlled ** bank, which is the main variable (instrument) of monetary policy, and the other instrument is the reserve ratio, these two variables ultimately change the amount of money in the market, in this way changes the supply and demand of money, changes the cost of funds in the market - the interest rate, becomes a very important variable in the economic process, and remains consistent.

For the first question, you need to clarify a few concepts, velocity v, acceleration a, and velocity change v. Just these 3 concepts. More than that.

The velocity v is a vector quantity, and the velocity variable v is the end velocity - the initial velocity = v2-v1, which is the difference of the vector, so it is also a vector itself. You'll do vector subtraction. If v2 and v1 are in different directions, v must be in a different direction than v1 and v2.

The direction of the change in the amount of velocity is the direction of the change in velocity" does not make any sense in itself. What is velocity change? There is no need to add such a concept, the change in velocity is the change in velocity v, this sentence is actually pouring dung:

The direction of the amount of velocity change is the direction of the amount of velocity change. ”

The point is that the direction of the velocity change v is not equal to the direction of velocity v2, v1. This is determined by vector operations.

The second question is, there is nothing wrong with the teacher's argument, I don't understand which of your examples contradicts the teacher's argument. But there is a fact that must be observed, the speed cannot be abruptly changed.

That's right, you don't understand, if a car drives to the left, and suddenly the acceleration is to the right, then it must be decelerating, and the acceleration is to the left, and if the acceleration is to the right, the speed is still to the left, because the speed has not yet decreased, and you have to keep moving forward until the speed is 0 and then it starts to move to the right, and the speed decreases, so the direction of the speed change is to the right.

The direction of velocity and the change in velocity are not necessarily the same direction.

Is it the plasma field of the electric batons? (Put a lap of electricity and take back that).

The support units and related variables are as follows (a picture I'm working on myself happens to have a similar skill to this skill, and I took a screenshot directly).

The plasma field (support) is a support unit, the skill adds a locust (will not be selected, and there is no health bar), itself is a flying unit, consumes 0 food, and the death time is adjusted to a minimum. The model is chosen by itself, and the number created in the trigger is determined according to the volume of the model (spell out a chichi hoop, and the gap should not be too large when reaching the maximum distance of Bo Menghe).

distance is a numeric variable-array (if a graph needs multiple distance variables, the following 2 can be changed to a number, and there is no need to appear a lot of variable names), which is used to determine the distance between the electric ring and the electric baton (according to the data increasing per second and the maximum distance you set, determine how long it will take to turn off trigger 2 and turn on trigger 3, here it is calculated as expanding by 30 yards per second).

danweizu is a unit group variable - array (the same reason for using arrays as above), ensuring that it only deals a single damage to the unit it encounters on the way back and forth (if you put the damage in the loop, you know the consequences).

Release (it's the same to change to any unit to cast skills, but you need to add a unit variable to the base faction, plus a trigger: set unit (that unit variable) = triggering unit, and the later Katie can be changed to unit, except for the first trigger).

Expansion (according to the needs of the model, if the sound effect or delay of death is too violated, change kill to remove) (because the judgment condition and the damage applied are relatively long and cannot be displayed, I will take a screenshot separately).

Judgment condition (i.e. only damage to the unit touched by the circle, depending on the size of the model, I count this as 200).

Deal damage (it's related to distance, the farther away the higher the damage, I'm this is the intelligence skill level distance 100, damage as needed).

Retract (when the Condition and Damage Reference Expansion are applied).

I hope it can help you, if you don't understand or don't have this skill, please ask. Hope.