JMP, data analysis software for scientists and engineers, links dynamic data visualization with powerful statistics, on the desktop. Learn more about JMP Statistical Software JMP is the tool of choice for scientists, engineers and other data explorers in almost every industry and government sector. DataMelt, or DMelt, is a software for numeric computation, statistics, analysis of large data volumes ('big data') and scientific visualization. The program can be used in many areas, such as natural sciences, engineering, modeling and analysis of financial markets. DMelt is a computational platform. Regress+ is quite a dated and simple free statistical analysis software for Mac including functions such as regression, stochastic modeling and bootstrapping. SOFA (Statistics Open For All) is a surprisingly good open source statistical software for Mac and Windows. Correspondence analysis (CA) is an extension of principal component analysis (Chapter @ref(principal-component-analysis)) suited to explore relationships among qualitative variables (or categorical data).Like principal component analysis, it provides a solution for summarizing and visualizing data set in two-dimension plots. Enter to Search. Box plots, nonparametric tests, and correspondence analysis. Fast Statistics includes more than 50 functions covering data and statistical-analysis requirements.
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Correspondence analysis plays a role similar to factor analysis or principal component analysis for categorical data expressed as a contingency table (e.g. Mac default apps preference pane. as described in the chi-square test of independence). For a 10 × 10, a complete description of the associations between row elements and column elements requires nine dimensions. Unfortunately, it is difficult for us to visualize such associations in more than two dimensions. In correspondence analysis, we project the row/column associations into two dimensions even if this requires that there is some loss in the accuracy of the representation.
Save web page as html. Essentially, correspondence analysis decomposes the chi-square statistic of independence into orthogonal factors. This approach is valid even when the cell sizes in the contingency table are less than 5 (or even zero).
Example 1: 80 teenagers were asked to select which of 6 characteristics best describe 4 popular brands of smart phones. The teenagers were permitted to comment on multiple brands of smart phone and choose more than one characteristic for any of the brands.
The brands are Apple, Samsung, Nokia and Huawei. The characteristics are Screen Display, Price, Design, Battery, Software, and Camera. The raw data is shown in Figure 1.
Figure 1 – Survey data
Note that the chi-square statistic for this contingency table is 164.33, as calculated, for example, by the Real Statistics formula =CHI_STAT(B4:E9). The inertia statistic is now set to the chi-square statistic divided by the sample size, i.e. 164.33/657 = .2501.
We next create the proportional matrix P by dividing each of the elements in the contingency table by the sample size, as shown in range O3:S9 of Figure 2.
Next we create the row totals in range T4:T9 and column totals in range P10:S10, and then the 6 × 6 array Dr (in range V4:AA9) using the array formula
=DIAGONAL(1/SQRT(T4:T9))
Here DIAGONAL(R1) is the Real Statistics array function which outputs a diagonal matrix whose diagonal consists of the elements in the row or column range R1, which in this case consists of the reciprocal of the square root of the elements in range T4:T9. Similarly, we create the 4 × 4 array Dc (located in range P13:S16) using the array formula =DIAGONAL(1/SQRT(P10:S10)).
We now create matrix A = DrPDc, as shown in range W13:Z18, using the array formula =MMULT(V4:AA9,MMULT(P4:S9,P13:S16)). Finally, we using the Matrix Operations data analysis tool to create a singular value decomposition of matrix A, as shown in Figure 3.
Figure 3 – Singular Value Decomposition Is mac torrents download safe.
We now calculate the F and G coordinate matrices and DDT matrix as shown in Figure 4. The coordinate matrices contain the factor coordinates and the DDT matrix contains the eigenvalues that are used to decompose the chi-square statistic.
Figure 4 – Coordinate matrices and eigenvalues
From the DDT matrix, we obtain the Eigenvalue table shown in Figure 5. This table corresponds to the table that produces a scree plot for factor analysis. In fact, we can use the table to create a scree plot for correspondence analysis. With just three potential factors, we won’t actually create the scree plot for this example.
Figure 5 – Eigenvalue decomposition
This table tells us that the first factor accounts for 87.57 % of the variation and the second factor accounts for 10.56% of the variation. Consequently, the first two factors account for 98.13% of the variation, and so we only lose 1.43% of the variation if we use only these two factors.
Note that the sum of the eigenvalues (i.e. Trailer park boys season 9 download torrent. the trace), 0.2501, is equal to the inertia that we calculated earlier (just after Figure 1).
A rule of thumb is that a two-dimension correspondence analysis (i.e. one where we retain just two factors) is sufficient provided the first two eigenvalues account for at least 50% of the variation, ideally much more. Razer synapse 1.0 download mac. If this rule of thumb is not met, then we need to make a trade-off between adding more factors and the difficulty of visualizing the information when more than two dimensions are used. For our purposes, we will assume that two factors are sufficient.
We next create the correspondence analysis plot detail reports for rows and columns, as shown in Figure 6.
Figure 6 – Plot Detail Reports
Since we retain two factors, we use two dimensions (or axes) in each report. Figure 7 describes the screen display profile entries in the Rows report (row 14).
Item | Interpretation | Cell | Formula |
Quality | 96.2% of the variation for the screen quality is captured by the two-dimensional model | AK14 | =AP14+AU14 |
Mass (or Weight) | 16.3% of the table is represented by the screen quality | AL14 | =T4 |
Distance | 0.0989 is the squared weighted distance between the screen display profile and the mean row profile | AM14 | =SUM((P4:S4/T4-P$10:S$10)^2/P$10:S$10) |
Inertia | 6.4% of the total inertia (i.e. the chi-square statistic) is due to the screen display profile | AN14 | =(AL14*AM14)/AN$20 |
Factor 1 | -.2886 is the axis 1 coordinate of the screen display profile | AO14 | =AD12 |
COR 1 | .842 is the correlation between the screen display profile and axis 1; i.e. the proportion of the screen variation explained by factor 1. | AP14 | =AO14^2/AM14 |
Angle 1 | 23.4o is the angle between the screen display profile and axis 1 | AQ14 | =180*ACOS(SQRT(AP14))/PI() |
CRT 1 | 6.19% is the contribution of the screen display to the inertia for axis 1; i.e. the proportion of the variation for axis 1 explained by this profile | AS14 | =AL14*AO14^2/$AD$36 |
eValue | .0136 is the part of the first eigenvalue (.219) due to the screen display | AT14 | =AR14*$AD$36 |
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Figure 7 – Detailed description for screen display profile
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Download tar file mac terminal. The description of the axis 2 components of the screen display profile are similar to the axis 1 descriptions shown in Figure 7, except that now the next column of the F matrix is used (i.e. range AE12:AE17 of Figure 4).
Note that cell AN20 contains the total inertia, as calculated by the formula =SUMPRODUCT(AL25:AL28,AM25:AM28). Note that this value, .2501, agrees with the value that we calculated twice previously.
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The values in the Column part of the report in Figure 6 are calculated as described in Figure 7, except that now we use the factors that result from the columns in the G matrix of Figure 4.
The row profile coordinates that are most important are characterized by COR > 1/k and CTR > 1/r where r = # of rows, c = # of columns and k = min(r, c) – 1. For Example 1 r = 6, c = 4 and k = 3, and so the most important row coordinates are characterized by COR > .3333 and CTR > .1667, which means that the most important row coordinates are for factor 1 of price and factor 2 of design and battery.
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Similarly, the most important column profile coordinates are characterized by COR > 1/k and CTR > 1/c.