Application Case 4.6
Data Mining Goes to Hollywood: Predicting Financial Success of Movies
Application Case 4.6 is about a research study where a number of software tools and data mining techniques are used to build data mining models to predict finan- cial success (box-office receipts) of Hollywood movies while they are nothing more than ideas.
Predicting box-office receipts (i.e., financial success) of a particular motion picture is an inter- esting and challenging problem. According to some domain experts, the movie industry is the “land of hunches and wild guesses” due to the difficulty asso- ciated with forecasting product demand, making the movie business in Hollywood a risky endeavor. In support of such observations, Jack Valenti (the longtime president and CEO of the Motion Picture Association of America) once mentioned that “... no one can tell you how a movie is going to do in the marketplace ... not until the film opens in darkened theatre and sparks fly up between the screen and the audience.” Entertainment industry trade journals and magazines have been full of examples, statements, and experiences that support such a claim.
Like many other researchers who have attempted to shed light on this challenging realworld problem, Ramesh Sharda and Dursun Delen have been exploring the use of data mining to pre- dict the financial performance of a motion picture at the box office before it even enters production (while the movie is nothing more than a conceptual idea). In their highly publicized prediction models, they convert the forecasting (or regression) problem into a classification problem; that is, rather than fore- casting the point estimate of box-office receipts, they classify a movie based on its box-office receipts in one of nine categories, ranging from “flop” to “block- buster,” making the problem a multinomial classifi- cation problem. Table 4.3 illustrates the definition of the nine classes in terms of the range of box-office receipts.
TABLE 4.3 Movie Classification Based on Receipts
Data
Data was collected from a variety of movie-related databases (e.g., ShowBiz, IMDb, IMSDb, AllMovie, BoxofficeMojo, etc.) and consolidated into a single data set. The data set for the most recently developed models contained 2,632 movies released between 1998 and 2006. A summary of the independent vari- ables along with their specifications is provided in Table 4.4. For more descriptive details and justifica- tion for inclusion of these independent variables, the reader is referred to Sharda and Delen (2006).
TABLE 4.4 Movie Classification Based on Receipts
Methodology
Using a variety of data mining methods, including neural networks, decision trees, SVMs, and three types of ensembles, Sharda and Delen developed the prediction models. The data from 1998 to 2005 were used as training data to build the prediction models, and the data from 2006 was used as the test data to assess and compare the models’ pre- diction accuracy. Figure 4.16 shows a screenshot of IBM SPSS Modeler (formerly Clementine data mining tool) depicting the process map employed for the prediction problem. The upper-left side of the process map shows the model development process, and the lower-right corner of the pro- cess map shows the model assessment (i.e., test- ing or scoring) process (more details on IBM SPSS Modeler tool and its usage can be found on the book’s Web site).
Results
Table 4.5 provides the prediction results of all three data mining methods as well as the results of the three different ensembles. The first performance measure is the percent correct classification rate, which is called Bingo. Also reported in the table is the 1-Away correct classification rate (i.e., within one category). The results indicate that SVM performed the best among the individual prediction models, followed by ANN; the worst of the three was the CART decision tree algorithm. In general, the ensemble models performed better than the individual prediction models, of which the fusion algorithm performed the best. What is probably more important to decision makers, and standing out in the results table, is the significantly low standard deviation obtained from the ensembles compared to the individual models.
TABLE 4.5 Tabulated Prediction Results for Individual and Ensemble Models
Conclusion
The researchers claim that these prediction results are better than any reported in the published litera- ture for this problem domain. Beyond the attractive accuracy of their prediction results of the box-office receipts, these models could also be used to further analyze (and potentially optimize) the decision variables to maximize the financial return. Specifically, the parameters used for modeling could be altered using the already trained prediction models to better understand the impact of different parameters on the end results. During this process, which is commonly referred to as sensitivity analysis, the decision maker of a given entertainment firm could find out, with a fairly high accuracy level, how much value a specific actor (or a specific release date, or the addition of more technical effects, etc.) brings to the financial success of a film, making the underlying system an invaluable decision aid.
