# Regression Model Analysis

It is not surprising that, the success of managing inventory can lead to the success of a firmâ€™s operational performance. Although we have not talked about the inventory management models, we will first look at real inventory data to identify some of the important factors that affect a firmâ€™s inventory performance.

The Excel file of Assignment 5 contains the quarterly information (Q1 to Q4) for more than 250 firms (mostly in the retailer and wholesaler industries, where inventory management is crucial to firmsâ€™ performance) in the fiscal year of 20102 .

Most of the variables are fairly straightforward, except the following ones whose definitions are shown below:

Account Payable = can be approximated to be the trade credit owed to the firmâ€™s suppliers.

Inventory turnover = how fast a firm turns their inventory into sales = (cost of goods sold)/(this period and last periodâ€™s inventory average)

Gross Margin = (sales â€“ cost of goods sold)/sales

Capital Intensity = (Gross fixed assets)/( Gross fixed assets + inventory)

Trade Credit Ratio = Account Payable/sales

You may use Excel and turn in the printout as well as the Excel file (by email). You still need to answer all questions asked in the problem by writing on your printout.

For the significance level, you can test for Alpha=1%, 5%, and 10%, respectively.

Two inventory performance measures can be used here: the inventory level (Column H) or the inventory turnover (Column L).

First, we investigate the variables that are correlated with the inventory level.

Hypothesis 1: The inventory level is positively correlated with the assets.

Hypothesis 2: The inventory level is positively correlated with the market value.

Hypothesis 3: The inventory level exhibits a seasonality pattern.

Hypothesis 4: The inventory level is generally higher in Q3 than Q1, Q2, and Q4, after controlling for the firm size measured by assets.

Hypothesis 5: The inventory level is positively correlated with the natural logarithm of (Account payable+1) after controlling for the firm size.

Hypothesis 6: The inventory level is positively correlated with Account payable after controlling for the firm size.

See COMPUSTAT for data source.

1. Build a regression model to test Hypothesis

1. Does the data support Hypothesis 1? Explain why.

2. Build a regression model to test Hypothesis

2. Does the data support Hypothesis 2? Explain why.

3. Build a regression model to jointly test Hypotheses 1 and 2. Does the data support both in this test? Explain why. Do you observe any issues?

4. Build a regression model to test Hypothesis

3. Does the data support Hypothesis 3? Explain why.

5. Build a regression model to test Hypothesis

4. Does the data support Hypothesis 4? Explain why. (Hint: you can â€œcontrolâ€ an independent variable simply by adding this variable into the regression model.)

6. Build models to test Hypotheses 5 and 6. Which model is better? Why?

Next, we investigate the variables that are correlated with the inventory turnover.

Hypothesis7: The inventory turnover is negatively correlated with the gross margin.

Hypothesis8: The inventory turnover is positively correlated with the capital intensity.

Hypothesis9: The inventory turnover is negatively correlated with the trade credit to sales ratio.

7. Build a model to jointly test Hypotheses 7-9, with and without controlling for the firm size measured by log(asset). Comment on the results and the insights you learn from the regression model.