True or False: And explain why in a few sentences
8. If you are modeling the weight of people in a clinical study, the R2 from regressing the weight in kilograms on age, height, gender, & dietary habits will be the same as when you record the weight in pounds and regress it on these variables.
Changes of units will not affect the goodness of fit of your model, its out of sample predictive accuracy, nor will it make you more or less likely to overfit
Therefore r square will be the same.
True
True or False: And explain why in a few sentences 8. If you are modeling the...
Please answer True/False and explain why. Consider a modeling exercise that has 20 possible predictor variables. You apply both forward and backward variable selection based on AIC. Both variable selection methods will always return exactly the same model, i.e. both variable selection algorithms will select the same set of predictor variables.
True/False, & explain why in one or two sentences: 1. Panel data is not the same as pooled cross-sectional data. 2. A randomized controlled trial for an experimental cancer treatment finds that 54% (0.54 proportion) of the people in the treatment group recovered fully, while 41% (0.41 proportion) of the people in the control group recovered fully. There were 120 people in each group. The standard error of the difference in means, measured as proportions rather than percentages, was 0.09....
True/False, & explain why in one or two sentences: 4. In the equation c = α + i + u, c denotes consumption and i denotes income. The residual for the 5th observation if c5 =$865 and ^c5 =$890 is 20. 5. The sum of squared residuals (SSR) in a regression analysis is 623.5 and the total sum of squares (SST) is equal to 751.85. The R2 is therefore equal to 0.24. 6. The value of R2 always lies between...
Section 1: True/False, & explain why in two or three sentences: 4. You are trying to forecast the quarterly US dollar-Euro exchange rate as a function of the difference between US & EU benchmark interest rates in this quarter and the previous quarter. This is an autoregressive distributed lag model.
Discuss the following statements and explain why they are true or false. (a) Increasing the number of predictor variables will never decrease the R2. (b) Multicollinearity affects the interpretation of the regression coefficients. (c) The variance inflation factor of ˆ βj depends on the R2 of the regression of the response variable y on the predictor variable xj. (d) A high leverage point is always highly influential. (e) All criteria for the selection of the best regression equation lead to...
Please state true false or Uncertain. Please explain in 3 or more sentences on why you choose it: 1) A central bank that targets inflation would conduct an expansionary monetary policy when faced with a recessionary gap. 2)If the policy response discussed in A6-7 is mistimed, it risks becoming pro-cyclical rather than stabilizing.
Section 1: True/False, & explain why three or more sentences: 2. In the regression model Yi = β0 + β1Xi + β2Di + β3(Xi × Di) + ui, where X is a continuous variable and D is a binary variable, β3 has no meaning since (Xi×Di) = 0 when Di= 0.
linear algebra problem
1. True or False. If true, explain why. If false provide a counterexample. . If A? - B2, then A - B (you can assume that A and B have the same size). • If columns 1 and 3 of B are the same, so are columns 1 and 3 of AB. • If rows 1 and 3 of B are the same, so are rows 1 and 3 of AB. • (AB) - A’B?
Determine whether each of the following statements is true or false, and explain why in a few sentences 1. A critical number c is a number in the domain of a function f for which f ′ ( c ) = 0 or f ′ ( c ) does not exist. 2. If f ′ ( c ) > 0 on an interval, the function is positive on that interval. 3. If c is a critical number, then the function...
Problem 5. True/False. (Is the statement true or false? Explain why.). 1. Both Northern blot and in situ hybridization techniques start with extracting and purifying all transcripts from an organism, an organ, or a group of cells. 2. Both Northern and Western blot techniques require preparation of a labeled DNA probe that is complementary to the transcript of a gene that you study